Open Chemistry Formerly Central European Journal of Chemistry

Open Chem., 2019; 17: 1339–1344

Research Article

T. M. Thant, N. S. Aminah*, A. N. Kristanti, R. Ramadhan, H. T. Aung, Y. Takaya Antidiabetes and Antioxidant agents from Clausena excavata root as medicinal plant of Myanmar

https://doi.org/10.1515/chem-2019-0056 received November 27, 2018; accepted February 27, 2019. the result of antioxidant activity investigation of (1) and (2) (IC50 values 2.66 and 1.55 mM), where ascorbic acid

Abstract: All around the world, patients with diabetes (IC50 0.012 mM) was used as standard. Both compounds and the prevalence of its disease are currently growing. showed their antidiabetic and antioxidant activity with Due to these side effects of oral hypoglycemic agents different fashion, especially exhibited strongest activity and oxidative stress in complicating diabetes, there is against on maltase α-glucosidase. growing interest in drugs, which possess dual function as both type II diabetes mellitus treatment and oxidative Keywords: Clausena excavata; dentatin; heptaphylline; stress treatment. The objective of this research is to α-glucosidase; antidiabetes; antioxidant; DPPH. search effective antidiabetes and antioxidant bioactive compounds from the Myanmar medicinal plant Clausena excavata. The root part of C. excavata was successfully 1 Introduction extracted with 95% ethanol and followed by column chromatographic separation technique. The structure In general, diabetes is a chronic metabolic disorder that of isolated pure compounds was elucidated by using could be serious and lethal. It is characterized by relative methods of spectroscopic such as UV-Vis, IR, NMR and or absolute insufficiencies which occurs either when HRFABMS spectrometry. The α-glucosidase inhibition the body cannot effectively use the insulin (a hormone assay was performed against baker’s yeast and rat that regulates blood glucose) it produces, or when the intestine (sucrose and maltase) α-glucosidases. The pancreas does not produce adequate insulin [1]. World activity of isolated compounds’ antioxidant was measured Health Organization (WHO) recognized three types of by using DPPH assay. Among the tested enzymes, the diabetes mellitus such as, (i) type 1 diabetes (insulin- two isolated compounds, which were dentatin (1) and dependent) (ii) type 2 diabetes (non-insulin-dependent) heptaphylline (2), exhibited highest inhibitory on maltase and (iii) gestational diabetes. One of the most frequent enzymes with IC50 values 6.75 and 11.46 µM; as positive effects of uncontrolled diabetes is raised blood glucose. It control, acarbose (IC50, 2.35 µM) was utilized. Moreover, could lead to fatal damages to the blood vessels, nerves, scavenging activity was found to be present upon seeing eyes, kidneys and eventually the heart [1, 2]. Diabetes is not only lethal but it is also the major cause of blindness, heart attacks, kidney failure, strokes, gangrene, and neuropathy especially for adults [3]. The patients of *Corresponding author: N. S. Aminah, Dept. of Chemistry, diabetes who also live with the prevalence of the disease Fac. of Science and Technology, Universitas Airlangga, are growing in the whole world. There were 422 million Komplek Kampus C UNAIR, Jl. Mulyorejo, Surabaya, Indonesia, E-mail: [email protected] diabetic adults (or about 8.5% of the world’s population) T. M. Thant, Ph.D. Student of Mathematics and Natural Sciences, in 2014. The number increased highly compared to the Fac. Of Science and Technology, Universitas Airlangga, Komplek year of 1980 with 108 million of diabetic adults (4.7% of Kampus C UNAIR, Jl. Mulyorejo, Surabaya, Indonesia; Dept. of the world’s population) [4]. Chemistry, Mandalar Degree College, Mandalay, Myanmar One inevitable consequence of Type 2 Diabetes A. N. Kristanti, R. Ramadhan, Dept. of Chemistry, Fac. of Science and Technology, Universitas Airlangga, Komplek Kampus C UNAIR, Mellitus (T2DM) is Hyperglycemia. The symptom is Jl. Mulyorejo, Surabaya, Indonesia marked by high level of blood sugar and it is said to be the H. T. Aung, Dept. of Chemistry, Mandalay University, Mandalay, most destructive effect associated with T2DM. The high Myanmar level of blood sugar stimulates glucose auto-oxidation so Y. Takaya, Fac. Of Pharmacy, Meijo University, 150 Yagotoyama, that free radicals could be formed. The presence of free Tempaku, Nagoya, 468-8503, Japan

Open Access. © 2019 T. M. Thant et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution alone 4.0 License. Unauthenticated Download Date | 1/8/20 10:53 PM 1340 T. M. Thant et al. radicals lead to macro and microvascular dysfunction A shrub named C. excavata Burm. f. (Rutaceae) is and polyneuropathy since it is exceeding the scavenging mainly distributed in southern and southeastern Asia, abilities of endogenous antioxidant defenses [5]. There are including Myanmar. It is usually known as ‘SatPu Khar Yar’ many harms that could be cause by free radicals such as by Myanmar people while the roots are commonly used damaging DNA, proteins, cellular molecules, and lipids as medications for colds, fever, headache, cough, malaria that further could lead to altered cellular functions. In colic, sores, wounds, rhinitis, and detoxification. The plant fact, recently there are numerous studies that reveal the possesses bioactive constituents which are mainly reported capability of antioxidants in neutralizing free radicals to be carbazole alkaloids [10, 11, 12], coumarins [13, 14, 15] effectively. For instance, animals induced with diabetes along with a little amount of triterpenoids [16], limonoids through experiments are able to prevent themselves in [17] and pyrano coumarin [18]. The bioactivities, such as developing the disease. Moreover, it is also effective in antiplatelet, antiplasmodial, antimicrobial, antitumor, reducing the severity of diabetic complications [6]. anti-HIV, antimycobacterial and antifungal activities, of Even though there are several drugs to tightly coumarins and carbazoles, have been reported from a regulate blood glucose, to reduce microvascular and different plant part and location [19], but there was not yet macrovascular complications, the main undesirable reported secondary metabolites from Myanmar C. excavata effects of this antidiabetic drug that are currently available and their antidiabetic and antioxidant activity. In this are brain damage, swelling, erythema, abdominal pain, research, we isolated constituents from C. excavata and weight gain, metallic taste, vitamin B12 deficiency, heart evaluated their antidiabetic activity that was measured failure and gastro intestinal disturbances. Due to these by an α-glucosidase inhibition assay. Meanwhile, the side effects of oral hypoglycemic agents and oxidative antioxidant activity was done by DPPH assay. The highest stress in complicating diabetes, there is growing interest inhibition activity against maltase α-glucosidases was in herbal medicament as one of the methods to cure T2DM shown from the two isolated compounds especially and oxidative stress [7]. against on maltase α-glucosidases. Besides insulin, there are other already-developed drugs that help the body lower blood glucose levels, such as insulin secretagogues, insulin sensitizers, α-glucosidase inhibitors, peptide analogues, dipeptidylpeptidase-4 2 Experimental Section inhibitors and glucagon like peptide-1. However, these synthetic medications possess dangerous side 2.1 Plant material effects, which include hypoglycemia, nausea, diarrhea, gastrointestinal discomfort, weight gain, liver disease, In October 2016, the researchers collected the roots of C. heart failure, etc. [2]. Natural products emerge as one excavata from Pyin Ma Nar Township, Mandalay Division, promising area in the activity of drug developments Myanmar [18]. Afterwards, the plant materials were sent given that the secondary metabolite derived from plants to Mandalay University, Myanmar, to be identified by Prof. and animals are proven effective to be healing agents for Soe Myint Aye, a botanist from Department of Botany of various diseases. The secondary metabolites of the plants, Mandalay University. grant the natural defense mechanisms against pathogens, predators, as well as self-protection against herbivores and microbes [8]. 2.2 Extraction and isolation The currently available modern medicines have numerous harmful effects. Therefore, to develop safe Over a period of two weeks, as much as 3.6 kg of the dried and effective medications for patients of diabetes is roots were consecutively extracted with 95% EtOH (12.0 undeniably needed. Plants are endowed with safe L) at room temperature. Once the solvent was removed by and effective natural ability as medications, proven evaporation, as much as 156g of dark gummy extracts was since the ancient times where plants have been an obtained. As much as 100g of the extracts was effectively exemplary source of medicine. After preclinical and partitioned three times using n-hex and methanol solvents clinical evaluation, various plants are proven to possess with ratio 1:1(v/v). Afterward, as much as 80.4g of methanol significant characteristics of antidiabetic property. portion was subjected to vacuum liquid chromatography Moreover, many phytoconstituents (compounds that are over silica gel that has been eluted with different mixtures responsible for antidiabetic effects) have been isolated of n-hexane: ethylacetate by gradually increasing gradient from plants in the past few years [9]. polarity. Ultimately, there were 7 combined fractions

Unauthenticated Download Date | 1/8/20 10:53 PM Antidiabetes and Antioxidant agents from Clausena excavata root as medicinal plant of Myanmar 1341

(MF-1 to -7) obtained from the process. One of the sub inhibition percentage was determined using [(A0-A1)/A0] × fractions namely sub fraction MF-1 was fractionated by 100, in which A0 refers to sample-less absorbance, while silica gel column eluted with gradient polarity n-hexane A1 refers to absorbance with sample. A graph of inhibition : ethylacetate, (0-10% EtOAc). From it, three sub fractions percentage against concentration of inhibition was used

(MF1.1 to MF-1.3) including pure compound (1, 368 mg) to determine the value of IC50. The standard control was were obtained. Finally, fraction MF-1.1 (1.3 g) was purified Acarbose® and the test was conducted in duplicate. on silica gel column eluted with gradient polarity n-hexane Moreover, to determine the inhibition of all isolated : ethylacetate, (0-5% EtOAc) and thereafter produced pure compounds against yeast, the method used by Damsud compound (2, 98 mg). et al. [21] was applied with a slight modification. 10 μL of sample and yeast (0.4 U/ml) was mixed in 1 mM phosphate buffer (pH 6.9) and shook with microplate shaker for about 2.3 General procedure 2 min and pre-incubated for 10 minutes at 37°C. 50 μL of p-nitrophenyl-α-D-glucopyranoside (PNPG) was added 1D and 2D NMR tests were performed on a Bruker 600 to the reaction mixture. Then, the mixture was put in the 1 13 MHz ( H) and 151 MHz ( C) in solvent CDCl3. The report of incubator for 20 minutes at 37°C. After the incubation, chemical shifts was shown in ppm as referenced to solvent Na2CO3 (100 μL) was added to the reaction in order to residues (CDCl3, δH 7.26 ppm and δC 77.0 ppm). Fisher-Johns quench it. The p-nitrophenoxide that was released from Melting Apparatus was utilized to determine melting PNPG was identified by iMark microplate reader at 405 points. Infrared spectra were recorded on KBr disks on nm. The equation mentioned above was employed to IRTracer-100, ν in cm–1. UV spectra and antioxidant assay calculate the percentage of inhibition. (DPPH) were measured with UV-1800 spectrophotometer. Vacuum liquid chromatography and analytical preparative thin layer chromatography were performed by using 2.5 DPPH radical scavenging assay

Kieselgel 60 (F254, Merck). Merck Kieselgel 60 (40-63 μm) was employed for column chromatography. Sigma Aldrich DPPH radical scavenging activity of isolated pure supplied rat intestinal acetone powder and baker’s yeast. compounds was performed using the method employed Inhibition of α-glucosidase was measured with a TECAN by Aminah et al. [22]. In this method, DPPH (2,2-diphenyl- Infinite 50 microplate reader spectrophotometer, whereas 1-picrylhydrazyl) reagent was utilized as free radicals. the spectrophotometric measurement of yeast was The reducing ability of antioxidants towards DPPH was conducted using iMarkTM microplate reader. evaluated by monitoring the decrease of its absorbance at 523 nm by UV spectrometer. Firstly, isolated compound was dissolved with methanol. It was then added with 2.4 α-Glucosidase inhibitory activities buffer acetate solution with the molarity of 0.1 M and a pH of 5.5 as well as 5.10-4 M DPPH radical solution. The The inhibition of α-glucosidase was examined using dissolution was done to determine antioxidant activity. a method explained by Ramadhan et al. [20]. The With a spectrometer at 523 nm, isolated compounds aforementioned protocol was used to determine the inhibition against DPPH radical was observed following inhibitory reaction of these isolated compounds against 30 minute incubation at 25°C. The percentage of inhibition maltase from rat intestine and sucrase. 20 μL of raw enzyme activity was quantified using this equation: [(Acontrol solution, 80 μL of glucose kit, and buffer of phosphate with – Asample )/ Acontrol × 100 ]. In this equation, Acontrol 0.1 M of molarity that consists of 10 μL of buffer (pH 6.9, refers to the stable DPPH radical’s initial concentration

30 μL) and 20 μL of the substrate solution (10mM maltose in the absence of the test compound. Meanwhile, Asample and 100 mM sucrose). The released glucose concentration shows the absorbance of the residual DPPH concentration was identified by the method of glucose oxidase with a with methanol. The values of IC50 (mM) were calculated glu-kit. After that, this reaction mixture was incubated using a plotted graph of extract concentration versus at 37°C. Maltase was incubated for 10 minutes, whereas scavenging; IC50 refers to the complete sum of antioxidant sucrose was incubated for 40 minutes. The glucose needed to lower the initial concentration of DPPH radical oxidase method was employed using a glu-kit to detect the by fifty percent. glucose concentration released from the action mixture Ethical approval: The conducted research is not (Human, Germany). Enzyme activity was calculated related to either human or animal use. through absorbance measurement at 503 nm. The reaction

Unauthenticated Download Date | 1/8/20 10:53 PM 1342 T. M. Thant et al.

OMe CHO 6 5 4 5 4 5a 6 7 3 5a 3 4a 4a 2 8 10a 2 7 OH 8b H3C 9a O 10 O OH 8a N 1a 1 H3C 8 11 H 10 8a 9 11b H3C 12 H3C 11 11a 13 12 13

1 2

Figure 1: The structure of isolated compounds 1 and 2 from C. excavata.

3 Results and Discussion compound (2) revealed a total of 11 signals representing 14 protons. In the down field region three singlets; Compound (1) yielded as white prism like crystal with intramolecular bonding OH-(δ 11.66) with –CHO (δ 9.91) and melting points 93–94 °C. According from HR-FABMS one broad signal due to –NH (δ 8.21) and another singlet spectrum it show molecular formula C20H22O4 (m=z 327.1597 proton H-4(δ 8.03).In the aromatic region four signals + [M + H] (calcd. for C20H22O4, 327.1596). The presence of with δ values, 7.97 (dd, J = 7.7 Hz, 1H, H-5) 7.26 (td, J=3.8, aromatic (1641, 1590, 1469 cm-1) groups and conjugated 7.7Hz, 1H, H-6), 7.40 (td, J=3.8, 7.7Hz, 1H, H-7) and 7.41 (dd, J lactone (1686 cm-1) was denoted by IR spectrum. Due = 7.7,3.8 Hz, 1H, H-8) showed the absence of substituent in to 7-oxygenated coumarin, absorption maxima were ring A. the presence of prenyl group was revealed by one exhibited by the spectrum of UV at 330 and 272 nm. The methylene protons at δ 3.64(d, J=6.9Hz,2H,H-9), δ 5.33 (t, 1H-NMR spectrum of compound (1) showed 9 signals and J= 6.9Hz,1H,H-10) and one dimethyl group (δ 1.91(s,3H,H- representing 27 protons it pattern is similar to nordentatin 12), δ 1.78(s, 3H,H-13). According to the spectra of 13C NMR only one methoxy signal at δ 3.83 (s, 3H). As a typical and DEPT, it was revealed that there were 18 signals and pyrano coumarin, compound (1) showed the presence of 18 carbons. Furthermore, the DEPT spectrum showed the two pyrone protons δ 6.19 (d, J = 9.6 Hz, 1H, H-3) and 7.87 presence of one aldehyde carbon, 8 quaternary carbons, 6 (d, J = 9.6 Hz, 1H, H-4). The presence of chromene ring was methine carbons, one methylene carbon, and two methyl showed by two olefinic proton pair δ 5.69 (d, J = 9.9 Hz, carbon as shown in (Table 2). The 2D NMR spectra such as 1H, H-7) and 6.56 (d, J = 9.9 Hz, 1H, H-6). The prenyl group DQF-COSY data revealed the correlation of two adjacent exomethylene protons was showed by δ 6.30 (dd, J = 17.4, protons (Figure S9). The HSQC spectrum gave the direct 10.6 Hz, 1H, H-12), δ 4.94 (dd, J = 17.4, 1.1 Hz, 1H, H-13), δ correlation protons and carbon. Finally, the combination 4.88(dd, J = 10.6, 1.1 Hz, 1H, H-13). Moreover the existence of fragments and attachments of substituents were of 1,1-dimethyl groups was revealed by two singlet peaks confirmed by HMBC data (Table S2) (Figure S1) and δ 1.45 (s, 6H) and δ 1.66 (s, 6H) (Table S1).The13C NMR data compound (2) was elucidated as heptaphylline (Figure 1). revealed the presence of lactone carbonyl with δ (160.7), It was also reliable with the data which reported earlier together with 8 quaternary carbons, 5 methine carbons, [11]. one sp2 methylene, one methoxy carbon and 4 methly Every isolated compound was utilized by carbons (Figure S2). After carefully checked all NMR data α-glucosidase assay to detect antidiabetes activity and and matched with literature values compound (1) was also by DPPH assay to detect antioxidant activity. Based elucidated as dentatin (Figure 1) [11]. on the tested compounds, dentatin (1) and heptaphylline Compound (2) afforded as yellow green crystal (2) displayed inhibition against on maltase and yeast

UV (MeOH), λmax (logε) 342 (0.97), 298(3.32), 278(3.02), α-glucosidase that have IC50 values of (6.75, 11.46 µM) and 249(1.64), 235(2.26). Compound (2)’s IR spectrum pointed (0.482, 24.96 mM) respectively. However, compound (1) -1 out that -OH and -NH functional groups at (3437 cm ) showed no inhibition whereas compound (2) IC50 value and carbonyl and aromatic benzene groups at (1728, 1612 223.9 (µM) against on sucrase enzymes (Table 1). According and 1588 cm-1) were present. In the spectrum of 1H NMR, to this data, compound (1) exhibited 2-fold more potent

Unauthenticated Download Date | 1/8/20 10:53 PM Antidiabetes and Antioxidant agents from Clausena excavata root as medicinal plant of Myanmar 1343

Table 1: α-Glucosidase inhibitory and antioxidant activities of isolated compounds (1-2).

Compound α-Glucosidase DPPH IC50 (mM)

Baker’s yeast IC50 (mM) Maltase IC50 (μM)* Sucrase IC50 (μM)* 1 0.481843 6.75 NI** 2.66

2 24.9641 11.46 223.91 1.55

Acarbose 0.1030 2.35 15.48 -

Ascorbic acid - - - 0.0118

* Nonlinear regression analyzes were evaluated by SigmaPlot 12.5 than compound (2) but 3-fold less potent than standard References control, acarbose (IC50 2.35 µM) against on maltase α-glucosidase. Each isolated compound demonstrated [1] World H.O., et al., Global Report on Diabetes, Curr. Med. Res. antioxidant activity with IC values of 2.66, and 1.55 mM Opin., 2014, 56(1), 1051–1062. 50 [2] Das S.K., Samantaray D., Patra J. K., Samanta L., Thatoi H., respectively. The results showed that the compound (1) is Antidiabetic potential of mangrove plants: a review, Front. Life higher inhibitory than compound (2) against on maltase Sci., 2016, 9(1), 75–88. and yeast enzymes. [3] Marles R.J., Farnsworth N.R., Antidiabetic plants and their active constituents, Phytomedicine, 1995, 29 (2), 137–189. [4] Giovannini P., Howes M.J.R., Edwards S.E., Medicinal plants used in the traditional management of diabetes and its 4 Conclusion sequelae in Central America: A review, J. Ethnopharmacol., 2016, 184, 58–71. In searching antidiabetic and antioxidant agents from [5] Bajaj S. and Khan A., Mini Review Antioxidants and diabetes, Indian J. Endocrinol. Metab., 2012, 16, S267-71. Myanmar medicinal plant C. eacavata root ethanolic [6] Parikh N.H., Parikh P.K., Kothari C., Indigenous plant extract lead to the isolation of two known bioactive medicines for health care: treatment of diabetes mellitus and compounds namely dentatin (1) and heptaphylline (2). hyperlipidemia, Chin. J. Nat. Med., 2014, 12(5), 335–344. Each isolated compound was evaluated on its antidiabetic [7] Yakoob A.T., Tajuddin N.B., Hussain M.I.M., Mathew S., activity and antioxidant activity by employing Govindaraju A., Qadri I., Antioxidant and hypoglycemic activities of Clausena anisata (Wild.) Hook F. Ex Benth. Root α-glucosidase inhibition and DPPH assays, respectively. Mediated Synthesized Silver Nanoparticles, Pharmacogn. J., Both compound (1) and compound (2) demonstrated the 2016, 8(6), 579–586. highest activity of inhibition against maltase (IC50 6.75 [8] Smith A., Gnanadhas A., Natarajan V., Arumugam K. M.,

µM), (IC50 11.46 µM) respectively. Nevertheless, compound Sundarrajan P., Isolation and characterization of anti-diabetic (1) and compound (2) showed that there was inhibition on compound from D Regea Volubils [Benth.] Leaf, 2016, 4, yeast α-glucosidase in the presence of IC values of 0.482 191–194. 50 [9] Patel D.K., Kumar R., Laloo D., Hemalatha S., Natural medicines and 24.96 mM. Furthermore, each isolated compound from plant source used for therapy of diabetes mellitus: an displayed antioxidant activity; the IC50 values were 2.66 overview of its pharmacological aspects, Asian Pacific J. Trop. and 1.55 mM (ascorbic acid, IC50 0.012 mM). The study Dis., 2012, 2(3), 239–250. showed both compounds demonstrated inhibition against [10] Peh T.H., Lim G.K., Taufiq-yap Y.H., Cheng G., Ee L., A new α-glucosidases and free radical scavenging activity. cytotoxic carbazole alkaloid isolated from the stem bark of malaysian Clausena excavata, Can. Chem. Trans., 2013, 1(3), Compound (1) showed a stronger activity. Hence, isolated 165–172. compound (1) from C excavata root can be a prospective [11] Sripisut T., Cheenpracha S., Ritthiwigrom T., Prawat U., candidate for natural antidiabetes and antioxidant agent. Laphookhieo S., Chemical constituents from the roots of Clausena excavata and their cytotoxicity, Rec. Nat. Prod., 2012, Acknowledgement: We would like to thank Airlangga 6(4), 386–389. Development Scholarship (ADS) and “RISET MANDAT [12] Wu T.S., Huang S.C., Wu P.L., Kuoh C.S., Alkaloidal and other constituents from the root bark of Clausena excavata, GRANT 2018 of Universitas Airlangga” that have funded Phytochemistry, 1999, 52(3), 523–527. this research. [13] Kumar R., Saha A., and Saha D., A new antifungal coumarin from Clausena excavata, Fitoterapia, 2012, 83(1), 230–233. Conflict of interest: Authors state no conflict of interest.

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[14] Ito C., et al., Chemical constituents of Clausena excavata: isolation and structure elucidation of novel furanone- coumarins with inhibitory effects for tumor-promotion, J. Nat. Prod., 2000, 63(9), 1218–1224. [15] Takemura Y., Nakamura K., Hirusawa T., Ju-ichi M., Ito C., Furukawa H., Four new furanone-coumarins from Clausena excavata, Chem. Pharm. Bull. (Tokyo), 2000, 48(4), 582–584. [16] Sunthitikawinsakul A., et al., Coumarins and carbazoles from Clausena excavata exhibited antimycobacterial and antifungal activities, Planta Med., 2003, 69(2), 155–7. [17] Muhd S.N.W., Cytotoxic constituents of Clausena excavata, African J. Biotechnol., 2011, 10(72), 16337–16341. [18] Thant T.M., et al., A new pyrano coumarin from Clausena excavata roots displaying dual inhibition against α-glucosidase and free radical, Natural Product Research, 2019, 1–6. DOI: 10.1080/14786419.2019.1586696. [19] Arbab I.A., et al., Clausena excavata Burm. f. (Rutaceae): a review of its traditional uses, pharmacological and phytochemical properties, J. Med. Plants Res., 2011, 5(33), 7177–7184. [20] Ramadhan R., Phuwapraisirisan P., New arylalkanones from Horsfieldia macrobotrys, effective antidiabetic agents concomitantly inhibiting α-glucosidase and free radicals, Bioorganic Med. Chem. Lett., 2015, 25(20), 4529–4533. [21] Damsud T., Chanwun T., Kaewpiboon C., Antidiabetic agents with α-glucosidase inhibition and antioxidant capacity from the shoots of Clausena cambodiana Guill, Int. J. Agric. Technol., 2017, 13(4), 449–456. [22] Aminah N.S., Kristanti A.N., Tanjung M., Antioxidant activity of flavonoid compounds from the leaves of Macaranga gigantea, J. Chem. Pharm. Res., 2014, 6(6), 688–692.

Supplemental Material: The online version of this article offers supplementary material (https://doi.org/10.1515/chem-2019-0056).

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 Editorial Information

Editor-in-Chief Joaquín Plumet, Complutense University, Spain

Managing Editor Agnieszka Topolska, Poland

Editorial Advisory Board Metin Hayri Acar, Istanbul Technical University, Turkey Sergei Aldoshin, Russian Academy of Sciences, Russia Alexandru T. Balaban, Texas A&M University, USA Roland Boese, University of Essen, Germany Ronald Breslow, Columbia University, USA Michel Che, Université Pierre et Marie Curie, France Lew P. Christopher, Lakehead University, Canada David C. Clary, University of Oxford, UK Graham Cooks, Purdue University, USA Elias J. Corey, Harvard University, USA Carlos Fernandez , Robert Gordon University, UK / , y, Karl degruyterFreed, University.com uses cookies of Chicago, to store USA information that enables us to optimize our website and make browsing more comfortable for you. To learn Boris Furtula, University of Kragujevac,more Serbia about the use of cookies, please read our privacy policy. Jean-François Gérard, SGM INSA Lyon, CNRS, ECNP, France OK

Raquel P. Herrera, Isqch (Csic-Uz) Instituto De Síntesis Química Y Catálisis Homogénea, Spain Janusz Jurczak, Warsaw University and Institute of Organic Chemistry, Poland Alexei Khokhlov, Moscow State University and Nesmeyanov Institute of Organoelement Compounds, Russia Tamas Kiss, University of Szeged, Hungary Alexander M. Klibanov, Massachusetts Institute of Technology, USA Jacek Klinowski, University of Cambridge, UK Shu Kobayashi, University of Tokyo, Japan Pavel Kratochvil, Academy of Sciences of the Czech Republic, Czech Republic Janusz Lipkowski, Polish Academy of Sciences, Poland Goverdhan Mehta, Indian Institute of Science, India Marian Mikolajczyk, Centre of Molecular and Macromolecular Studies, Poland Achim Müller, University of Bielefeld, Germany Koji Nakanishi, Columbia University, USA Stanislaw Penczek, Centre of Molecular and Macromolecular Studies, Poland Chintamani Nagesa Ramachandra Rao, Jawaharlal Nehru Centre for Advanced Scientific Research, India Thomas Rauchfuss, University of Illinois, USA Vladimir Sklenar, Masaryk University, Czech Republic Edward I. Solomon, Stanford University, USA Frigyes Solymosi, University of Szeged, Hungary Karel Stulik, Charles University, Czech Republic Nurhayat Tabanca, USDA ARS, United States Barry Trost, Stanford University, USA Donald Truhlar, University of Minnesota, USA Karel Ulbrich, Academy of Sciences of the Czech Republic, Czech Republic Fosong Wang, Chinese Academy of Sciences, China George Whitesides, Harvard University, USA Frank Würthner, Institut für Organische Chemie & Center for Nanosystems Chemistry, Germany Hisashi Yamamoto, University of Chicago, USA Yoshinori Yamamoto, Tohoku University, Japan Jung Woon Yang, Sungkyunkwan University, South Korea Miguel Yus, University of Alicante, Spain Qi-Feng Zhou, Peking University, China

Editors:

Analytical Chemistry Ebaa Adnan Azooz, University of Kufa, Iraq Darya Asheghali, Duke University, USA Arindam Bose, Harvard University, USA Domenico Cautela, Stazione Sperimentale per le Industrie delle Essenze e dei derivati dagli Agrumi (SSEA), Italy Dariusz Guziejewski, University of Lodz, Poland Chiara Fanali, Campus Bio-Medico University of Rome, Italy Agata Jakóbik-Kolon, Silesian University of Technology, Poland Peter Knittel, Fraunhofer IAF, Institute for Applied Solid State Physics, Germany Xing Ma, Harbin Institute of Technology (Shenzhen), China Antonio Martin-Esteban, National Institute for Agricultural and Food Research and Technology (INIA), Spain Waqas Nazeer, University of Education, Pakistan Jorge Pereira, Analytical Chemistry and Enology Lab (ACE-lab), Madeira University, Portugal / Francescodegruyter Siano,.com uses Consiglio cookies Nazionaleto store information delle Ricerche that enables (CNR) us to Istitutooptimize diour Scienze website anddell’Alimentazione make browsing more (ISA), comfortable Italy for you. To learn Krishnamoorthy Sivakumar, SCSVMV moreUniversity about ,the India use of cookies, please read our privacy policy. Constantinos K. Zacharis, School of Pharmacy, Aristotle UniversityOK of Thessaloniki (AUTh), Greece

Bioanalytical Chemistry Silvana Andreescu, Clarkson University, USA Murali Anuganti, University of Nevada, USA Jorge Pereira, Analytical Chemistry and Enology Lab (ACE-lab), Madeira University, Portugal

Biochemistry and Biological Chemistry Murali Anuganti, University of Nevada, USA Arindam Bose - Harvard University, USA Dibyendu Dana, Angion Biomedical Corporation,USA Rajat Subhra Das, Omega Therapeutics, USA Raj Mukherjee, Sanofi, CHC R&D, USA Atul Srivastava, University of Chicago, USA

Biochemistry and Biotechnology Costel C. Darie, Clarkson University, USA Luyun Jiang, Oxford University, UK

Biomaterials Murali Anuganti, University of Nevada, USA Mazeyar Parvinzadeh Gashti, PRE Labs Inc, Canada Saravana Kumar Jaganathan, Universiti Teknologi Malaysia, Johor Xing Ma, Harbin Institute of Technology (Shenzhen), China

Biophysics and Chemical Physics in Biology Atul Srivastava, University of Chicago, USA Iveta Waczulikova, Comenius University, Slovakia

Catalysis Diego Alonso, Alicante University, Spain Xavier Companyó, University of Padua, Italy Tecla Gasperi, Università “Roma Tre”, Italy Awal Noor, COMSATS Institute of Information Technology, Abbottabad Campus, Paksitan Navpreet Kaur Sethi, Zhejiang University, China

Chemical Kinetics and Reactivity Khuram Shahzad Ahmad, Fatima Jinnah Women University, Pakistan Sayak Bhattacharya, Galgotias University, India Xavier Companyó, University of Padua, Italy Zhien Zhang, Ohio State University, USA

Chemical Physics Sayak Bhattacharya, Galgotias University, India Mohsen Mhadhbi, National Institute of Research and Physical-chemical Analysis, Tunisia Ponnadurai Ramasami, University of Mauritius, Mauritius

Clinical Chemistry Arindam Bose - Harvard University, USA

Tingting Zheng, Peking University Shenzhen Hospital, China / degruyter.com uses cookies to store information that enables us to optimize our website and make browsing more comfortable for you. To learn Computational Chemistry, Chemometricsmore and about QSAR the use of cookies, please read our privacy policy. Robert Fraczkiewicz, Simulations Plus, Inc., USA OK Jose Gonzalez-Rodriguez, University of Lincoln, UK Coordination Chemistry Awal Noor, COMSATS Institute of Information Technology, Abbottabad Campus, Paksitan

Crystallography Awal Noor, COMSATS Institute of Information Technology, Abbottabad Campus, Paksitan

Electrochemistry Dariusz Guziejewski, University of Lodz, Poland Paweł Jeżowski, Poznan University of Technology, Poland Luyun Jiang, Oxford University, UK Peter Knittel, Fraunhofer IAF, Institute for Applied Solid State Physics, Germany Laszlo Peter, Hungarian Academy of Sciences, Hungary Jose Gonzalez-Rodriguez, University of Lincoln, UK

Environmental Chemistry Khuram Shahzad Ahmad, Fatima Jinnah Women University, Pakistan Aleksander Astel, Pomeranian Academy, Poland Sayak Bhattacharya, Galgotias University, India Paolo Censi, University of Palermo, Italy Christophoros Christophoridis, National Research Center "Demokritos", Greece Ahmed S. Ibrahim, Qatar University, Qatar Agata Jakóbik-Kolon, Silesian University of Technology, Poland Luyun Jiang, Oxford University, UK Fei Li Zhongnan, University of Economics and Law, China Awal Noor, COMSATS Institute of Information Technology, Abbottabad Campus, Paksitan Tanay Pramanik, Lovely Professional University, India Lakshmi Narayana Suvarapu, Yeungnam University, Republic of Korea Zhien Zhang, Ohio State University, USA

Fluorescence Spectroscopy Krishnamoorthy Sivakumar, SCSVMV University, India

Inorganic Chemistry Aharon Gedanken, Bar-Ilan University, Israel Agata Jakóbik-Kolon, Silesian University of Technology, Poland Zoran Mazej, Jozef Stefan Institute, Slovenia Mohsen Mhadhbi, National Institute of Research and Physical-chemical Analysis, Tunisia Awal Noor, COMSATS Institute of Information Technology, Abbottabad Campus, Paksitan Tiefeng Peng, Southwest University of Science and Technology & Chongqing University, China Snezana Zaric, University of Belgrade (Serbia) and Texas A&M University at Qatar

IR and Raman Spectroscopy Xing Ma, Harbin Institute of Technology (Shenzhen), China María Mar Quesada-Moreno, Max Planck Institute for the Structure and Dynamics of Matter, Germany

Macromolecules and Polymers Mazeyar Parvinzadeh Gashti, PRE Labs Inc, Canada

Saravana Kumar Jaganathan, Universiti Teknologi Malaysia, Johor / Tanaydegruyter Pramanik,.com uses Lovely cookies Professional to store information University that, Indiaenables us to optimize our website and make browsing more comfortable for you. To learn Christian Schmitz, University Hochschulemore Niederrhein, about the use Germany of cookies, please read our privacy policy.

Shin-ichi Yusa, University of Hyogo, Japan OK

Szczepan Zapotoczny, Jagiellonian University, Poland Zhien Zhang, Ohio State University, USA

Materials Csaba Balazsi, Centre for Energy Research, Hungarian Academy of Sciences, Hungary Sergio Carrasco, Stockholm University, Sweden Aharon Gedanken, Bar-Ilan University, Israel Huanhuan Feng, Harbin Institute of Technology, China Mazeyar Parvinzadeh Gashti, PRE Labs Inc, Canada Saravana Kumar Jaganathan, Universiti Teknologi Malaysia, Johor Mohsen Mhadhbi, National Institute of Research and Physical-chemical Analysis, Tunisia Janos Szepvolgyi, Hungarian Academy of Sciences, Hungary

Medicinal Chemistry Murali Anuganti, University of Nevada, USA Dr Biljana Arsic, University of Nis, Republic of Serbia Dibyendu Dana, Angion Biomedical Corporation,USA Rajat Subhra Das, Omega Therapeutics, USA Tecla Gasperi, Università “Roma Tre”, Italy Sravanthi Devi Guggilapu, University of Maryland-College Park, USA Iryna Kravchenko, Odessa National Polytechnic University, Ukraina Awal Noor, COMSATS Institute of Information Technology, Abbottabad Campus, Paksitan Tanay Pramanik, Lovely Professional University, India Tingting Zheng, Peking University Shenzhen Hospital, China

Natural Product Chemistry Khuram Shahzad Ahmad, Fatima Jinnah Women University, Pakistan Domenico Cautela, Stazione Sperimentale per le Industrie delle Essenze e dei derivati dagli Agrumi (SSEA), Italy Łukasz Cieśla, The University of Alabama, USA Przemysław Kowalczewski, Poznan University of Life Sciences, Poland Iryna Kravchenko, Odessa National Polytechnic University, Ukraina Chanchal Kumar Malik, Vanderbilt University, USA Shagufta Perveen, King Saud University, Kingdom of Saudi Arabia Riaz Ullah - King Saud University Riyadh, Saudi Arabia Francesco Siano, Consiglio Nazionale delle Ricerche (CNR) Istituto di Scienze dell’Alimentazione (ISA), Italy Nurhayat Tabanca, USDA-ARS, Subtropical Horticulture Research Station, Miami, USA

NMR Spectroscopy Shagufta Perveen, King Saud University, Kingdom of Saudi Arabia Atul Srivastava, University of Chicago, USA

Organic Chemistry Anthony J. Burke - University of Évora, Portugal Eugenijus Butkus, Vilnius University, Lithuania Xavier Companyó, University of Padua, Italy Dibyendu Dana, Angion Biomedical Corporation,USA Tecla Gasperi, Università “Roma Tre”, Italy

Sravanthi Devi Guggilapu, University of Maryland-College Park, USA / Chanchaldegruyter Kumar.com uses Malik, cookies Vanderbilt to store University information, thatUSA enables us to optimize our website and make browsing more comfortable for you. To learn Matthew O'Brien, Keele University, UKmore about the use of cookies, please read our privacy policy.

Tanay Pramanik, Lovely Professional University, India OK

Organometallic Chemistry Awal Noor, COMSATS Institute of Information Technology, Abbottabad Campus, Paksitan Cristian Silvestru, Babes-Bolyai University, Romania Lakshmi Narayana Suvarapu, Yeungnam University, Republic of Korea

Pharmaceutical Chemistry Arindam Bose - Harvard University, USA Sravanthi Devi Guggilapu, University of Maryland-College Park, USA Przemysław Kowalczewski, Poznan University of Life Sciences, Poland Raj Mukherjee, Sanofi, CHC R&D, USA

Photochemistry Przemysław Kowalczewski, Poznan University of Life Sciences, Poland Krishnamoorthy Sivakumar, SCSVMV University, India

Physical Chemistry Catinca Secuianu, Imperial College London, UK Huanhuan Feng, Harbin Institute of Technology, China Luyun Jiang, Oxford University, UK Mohsen Mhadhbi, National Institute of Research and Physical-chemical Analysis, Tunisia Tiefeng Peng, Southwest University of Science and Technology & Chongqing University, China María Mar Quesada-Moreno, Max Planck Institute for the Structure and Dynamics of Matter, Germany Ponnadurai Ramasami, University of Mauritius, Mauritius

Physical Chemistry and Physical Organic Chemistry Sayak Bhattacharya, Galgotias University, India Ponnadurai Ramasami, University of Mauritius, Mauritius

Phytochemistry Khuram Shahzad Ahmad, Fatima Jinnah Women University, Pakistan Iryna Kravchenko, Odessa National Polytechnic University, Ukraina Chanchal Kumar Malik, Vanderbilt University, USA Shagufta Perveen, King Saud University, Kingdom of Saudi Arabia Riaz Ullah - King Saud University Riyadh, Saudi Arabia

Radiochemistry and Nuclear Chemistry Stefan Neumeier, Forschungszentrum Jülich, Germany

Solid State Chemistry Sofoklis Makridis, University of Western Macedonia & Lawrence Berkeley National Laboratories, USA Chanchal Kumar Malik, Vanderbilt University, USA Mohsen Mhadhbi, National Institute of Research and Physical-chemical Analysis, Tunisia

Spectroscopy Xavier Companyó, University of Padua, Italy Huanhuan Feng, Harbin Institute of Technology, China Mazeyar Parvinzadeh Gashti, PRE Labs Inc, Canada

Krishnamoorthy Sivakumar, SCSVMV University, India / degruyter.com uses cookies to store information that enables us to optimize our website and make browsing more comfortable for you. To learn Supramolecular Chemistry and Nanochemistrymore about the use of cookies, please read our privacy policy. Krishnamoorthy Sivakumar, SCSVMV University, India OK

Surface Chemistry and Colloids Huanhuan Feng, Harbin Institute of Technology, China Mazeyar Parvinzadeh Gashti, PRE Labs Inc, Canada Xing Ma, Harbin Institute of Technology (Shenzhen), China Mohsen Mhadhbi, National Institute of Research and Physical-chemical Analysis, Tunisia Raj Mukherjee, Sanofi, CHC R&D, USA Tiefeng Peng, Southwest University of Science and Technology & Chongqing University, China Christian Schmitz, University Hochschule Niederrhein, Germany Jose Luis Toca-Herrera, University of Natural Resources and Life Sciences, Austria

Nanochemistry Silvana Andreescu, Clarkson University, USA Mazeyar Parvinzadeh Gashti, PRE Labs Inc, Canada Omkar Singh Kushwaha, Chemical Engineering Department, Indian Institute of Technology, India Jerzy Langer, Adam Mickiewicz University, Poland Xing Ma, Harbin Institute of Technology (Shenzhen), China Linda Mbeki, VU University Amsterdam, The Netherlands Waqas Nazeer, University of Education, Pakistan Gaweł Sołowski, Gdansk University Of Technology, Poland Jose Luis Toca-Herrera, University of Natural Resources and Life Sciences, Austria Tingting Zheng, Peking University Shenzhen Hospital, China

Thermodynamics Sayak Bhattacharya, Galgotias University, India

Theoretical and Computational Chemistry Sayak Bhattacharya, Galgotias University, India Christiana Mitsopoulou, National and Kapodistrian University of Athens, Greece Ponnadurai Ramasami, University of Mauritius, Mauritius

Language Editors Kingsley K. Donkor, Thompson Rivers University, Canada Emmanuel G. Escobar, University of Sheffield, UK Marie Frusher, Defence Science & Technology Laboratory, UK Victoria Guarisco, Macon State College, USA Heidi Huttunen-Hennelly, Thompson Rivers University, Canada Richard Johnson, UK Kate Khan, Imperial College London, UK Monika Marciniak, University of Washington, USA Mayoorini Majuran, Monash University, Clayton, Australia Vijaykumar D. Nimbarte, Goethe University Frankfurt am Main, Germany Monica Ramirez, Broward College, USA Maria Reiner, Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Germany Andrea Renzetti, University of Cambridge, UK Navpreet K. Sethi, Zhejiang University, Hangzhou, China Bryan Spiegelberg, Rider University, USA Michael Wentzel, University of Minesota, USA

/ Technicaldegruyter Editor:.com uses cookies to store information that enables us to optimize our website and make browsing more comfortable for you. To learn Jakub Czubik, Poland more about the use of cookies, please read our privacy policy.

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Editorial Contact Agnieszka Topolska [email protected]

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Open Chemistry

Country Germany - SIR Ranking of Germany Subject Area and Chemistry 12 Category Chemistry (miscellaneous)

Materials Science H Index Materials Chemistry

Publisher Walter de Gruyter GmbH

Publication type Journals

ISSN 23915420

Coverage 2015-ongoing

Scope Open Chemistry is a peer-reviewed, open access journal that publishes original research, reviews and short communications in the elds of chemistry in an ongoing way. Our central goal is to provide a hub for researchers working across all subjects to present their discoveries, and to be a forum for the discussion of the important issues in the eld. Our journal is the premier source for cutting edge research in fundamental chemistry and it provides high quality peer review services for its authors across the world. Moreover, it allows for libraries everywhere to avoid subscribing to multiple local publications, and to receive instead all the necessary chemistry research from a single source available to the entire scientic community.

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Quartiles

The set of journals have been ranked according to their SJR and divided into four equal groups, four quartiles. Q1 (green) Chemistrcomprisesy (miscellaneous) the quarter of the journals with the highest values, Q2 (yellow) the second highest values, Q3 (orange) the third highest values and Q4 (red) the lowest values.

Category Year Quartile Materials Chemistry Chemistry (miscellaneous) 2004 Q4 Chemistry (miscellaneous) 2005 Q4 Chemistry (miscellaneous)2004 20062005 2006Q4 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Chemistry (miscellaneous) 2016 Q3

SJR Citations per document https://www.scimagojr.com/journalsearch.php?q=21100384025&tip=sid&clean=0 1/4 1/9/2020 Open Chemistry The SJR is a size-independent prestige indicator that ranks This indicator counts the number of citations received by 0.4journals by their 'average prestige per article'. It is based on documents2 from a journal and divides them by the total the idea that 'all citations are not created equal'. SJR is a number of documents published in that journal. The chart measure of scientic inuence of journals that accounts shows the evolution of the average number of times 0.2 1.6 for both the number of citations received by a journal and documents published in a journal in the past two, three and the importance or prestige of the journals where such four years have been cited in the current year. The two citations come from It measures the scientic inuence of years line is equivalent to journal impact factor ™ 0 1.2 the average article in a journal, it expresses how central to (Thomson Reuters) metric. the global2004 scientic2006 2008 discussion2010 an2012 average2014 article2016 of the 2018 0.8Cites per document Year Value Total Cites Self-Cites Cites / Doc. (4 years) 2003 0.000 400 Cites / Doc. (4 years) 2004 0.000 Evolution of the total number of citations and journal's self- 0.4 Cites / Doc. (4 years) 2005 0.000 citations received by a journal's published documents Cites / Doc. (4 years) 2006 0.000 during the three previous years. Cites / Doc. (4 years) 2015 0.000 200Journal Self-citation is dened as the number of citation 0 Cites / Doc. (4 years) 2016 1.069 from a journal citing article to articles published by the Cites2003 / Doc.2005 (4 years)2007 2009201720111.5862013 2015 2017 same journal. Cites / Doc. (4 years) 2018 1.615 0 CitesCites / Doc./ Doc. (3 (4 y years)ears) 2003 0.000 Cites / Doc. (3 years) Cites2003 2005Year2007 V2009alue 2011 2013 2015 2017 Cites / Doc. (3 years) 2004 0.000 Cites / Doc. (2 years) S lf Cit 2003 0 Cit / D (3 ) 2005 0 000 External Cites per Doc Cites per Doc % International Collaboration

1.8Evolution of the number of total citation per document and 40International Collaboration accounts for the articles that external citation per document (i.e. journal self-citations have been produced by researchers from several countries. removed) received by a journal's published documents The chart shows the ratio of a journal's documents signed 0.9during the three previous years. External citations are 20by researchers from more than one country; that is calculated by subtracting the number of self-citations from including more than one country address. the total number of citations received by the journal’s 0 0 documents. Year International Collaboration 2003 2005 2007 2009 2011 2013 2015 2017 20032003 0.002005 2007 2009 2011 2013 2015 2017 Cit Y V l 2004 0 Citable documents Non-citable documents Cited documents Uncited documents

400 400 Not every article in a journal is considered primary research Ratio of a journal's items, grouped in three years windows, and therefore "citable", this chart shows the ratio of a that have been cited at least once vs. those not cited during journal's articles including substantial research (research the following year. 200articles, conference papers and reviews) in three year 200 windows vs. those documents other than research articles, Documents Year Value reviews and conference papers. Uncited documents 2003 0 0 Uncited0 documents 2004 1 Documents2003 2005 2007 2009Year2011 V2013alue 2015 2017 Uncited2003 documents2005 2007 20092005 20111 2013 2015 2017 N it bl d t 2003 0 Uncited documents 2006 1

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