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Isolation of Phenyl Propanoid Glycosides from Allium Tripedale Trautv

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Isolation of Phenyl Propanoid Glycosides from Allium Tripedale Trautv Archive of SID Journal of ReportsIsolation in Pharmaceutical and Identification Sciences of Phenyl Propanoid Glycosides 2018, 7(2), 116-122 Isolation of Phenyl Propanoid Glycosides from Allium tripedale Trautv Hamidreza Ghaffaria, Masoud Sadeghi Dinanib* a School of Pharmacy, Isfahan University of Medical Sciences, Isfahan, Iran bDepartment of Pharmacognosy, School of Pharmacy, Isfahan University of Medical Sciences, Isfahan, Iran A B S T R A C T Allium species are widely used plant species, which are consumed ARTICLE INFO worldwide as raw vegetable, to make different dishes and as medicinal plants. As a member of this genus, Allium tripedale Trautv., locally called Article Type: “Khargeriu, Anashq”, is an important spicy edible Allium in “Zagros” region in the Research Article west and northwest of Iran which is used widely by local people as a spicy Article History: vegetable. Phytochemical investigation of underground part of the plant Received: 2017-08-24 resulted to the isolation of two phenylpropanoid glycosides as the main Revised: 2017-10-09 Accepted: 2017-10-25 phenolic constituents of chloroform-methanol extract of the bulbs. ePublished: 2018-02-26 Chemical structure of afforded compounds were elucidated by Keywords: comprehensive spectroscopic analyses including 1D and 2D NMR and MS as Allium tripedale 3-(4-hydorxy phenyl)propyl β-D-Glucopyranoside (1) and coniferyl β-D- Coniferin Glucopyranoside (coniferin) (2). Isolation and identification of Phytochemistry Phenyl propanoid glycoside phenylpropanoid derivatives from A. tripedale Trautv. is reported for the first time in this paper. *Corresponding Author: Masoud Sadeghi Dinani, E-mail: [email protected] CopyrightCopyright © 201 ©8 201by Kermanshah8 by Kermanshah University University of Medical of SciencesMedical Sciences JRPS, 2018, 7(2), 116-122| 116 www.SID.ir Archive of SID Ghaffari and Sadeghi Dinani Introduction Materials and Methods Allium is the largest genus of the Amaryllidaceae General experimental procedures family covering about 750 species including ornamental, edible and medicinal plants which are Medium pressure liquid chromatography (MPLC) cultivated and collected all around the world with was performed by a Buchi Gradient System C-605 a more distribution in northern hemisphere [1-4]. apparatus using glass columns of LiChroprep® RP- Beside the use as common vegetables all over the 18 (25-40µm) and C-660 Buchi fraction collector. world and also being an element of Mediterranean TLC performed on SiO2 plates with diet, Allium species are among medicinal plants BuOH:H2O:CH3COOH (60:25:15 v/v/v) (BAW) as a which have been historically used for the mobile phase and cerium sulfate in 2N H2SO4 and treatment of many diseases specially natural product (NP) as reagents for visualizing cardiovascular diseases, hypercholesterolemia, the spots. obesity, diabetes, cataract, tumors and HPLC was performed by Waters 515 apparatus gastrointestinal tract complaints [2]. equipped with a refractive index detector (Waters Phytochemically, Allium species are rich sources 2414) and UV detector (Waters 2487, λ : 254, 365 of important secondary metabolites involving nm), using semipreparative C18 (Novapak®, 7.8 x steroidal saponin and sapogenins, flavonoids and 300 mm) and analytical C18 columns (Novapak®, organosulfur compounds [5,6] and numerous 3.9 x 300 mm) in isocratic mode. pharmacologically active compounds have been H and C NMR spectra recorded by Bruker 400MHz isolated from different Allium species in recent (H at 400 MHz and C at 100 MHz) spectrometer, years. As a member of natural phenolic using solvent signal for calibration (CD3OD: compounds, phenyl propanoid glycosides (PPGs) δH=3.31, δC=49.0). Distortionless enhancement are valuable secondary metabolites widely by polarization transfer (DEPT) experiments was distributed in different plant species including used to determine the multiplicities of C NMR Allium species and have been demonstrated to resonances. possess different pharmacological activities 2D heteronuclear multiple bond correlation specially in the treatment of hypertension, viral (HMBC), optimized for 2–3JCH of 8 Hz, was used for infections, fungal infections, tumors, cancer and determination of two and three bond immune system related disorders [7-11]. heteronuclear1H–13C connectivities, while 2D Honey garlic, Allium tripedale Trautv. is an spicy Heteronuclear Single-Quantum Coherence (HSQC), edible Allium of “Zagros” mountainous region in interpulse delay set for 1JCH of 130 Hz, was used the west and northwest of Iran, wildly grows in for determination of one-bond heteronuclear1H– this region and its strongly odorous leaves are 13C connectivities. ESIMS spectra were prepared used widely by local people as a raw vegetable by Shimadzu LCMS 2010 EV, using methanol as and also to make different dishes [12]. The plant is the solvent. locally called “Khargeriu” or “Anashq” and beside the culinary uses is also considered as a medicinal Plant material plant, traditionally has been used for the treatment of various infectious conditions [13]. As a The whole plant of A. tripedale was collected from part of our research program on different Allium Khorram-Abad, Lorestan province on April 2013. species, phytochemical investigation of A. The plant was identified by botanist and a voucher tripedale has been conducted and the current specimen (No. 3579) deposited at the Department paper reports the isolation and identification of of Pharmacognosy, Faculty of Pharmacy, Isfahan the main phenolic constituents have been isolated University of Medical Sciences, Iran. from the chloroform-methanolic extract of the plant. Copyright © 2018 by Kermanshah University of Medical Sciences JRPS, 2018, 7 (2), www.SID.ir116-122| 117 Archive of SID Isolation and Identification of Phenyl Propanoid Glycosides Extraction and Isolation and δH 3.20) and an anomeric proton signal (δH 4.31) together with overlapped sp3 proton signals Air-drided undergroud parts of A. tripedale were (δH 3.22-3.81), suggesting the glycosilated finely powdered by means of a mill and the aromatic nature for compound (1). powder (500 g) was extracted at room CNMR spectral analysis of (1) showed 13 carbon temperature in a four step extraction method with signals including 2 double height sp2 aromatic increasing solvent polarity using the solvents; methine carbons (δC 116.13 and 130.91), 2 hexane, chloroform, chloroform-methanol (9:1) quaternary sp2 carbon signals (δC 130.76, 156.82), and methanol. Extraction was done using an anomeric carbon signal (δC 104.60) and 8 sp3 maceration method, performing each step four carbon signals (δC 19.80-78.25) which in times with 2 L of solvent under occasional stirring. agreement with MS and HNMR spectral data The chloroform-methanol (9:1) extract was confirmed the glycosilated aromatic nature of concentrated under vacuum, yielding a dried compound (1) and suggested the molecular extract (12 g) which was then fractionated by formula as C15H22O7 (Table 2). MPLC on a RP-18 column (36*460 mm) using a Finally by determination of low and high range 1H- 13 linear gradient solvent system of H2O to MeOH. C connectivities through HSQC and HMBC Fractions were analyzed by TLC (SiO2, BAW experiments, and comparing the spectral data 60:15:25 v/v/v, reagents: cerium sulfate in 2N with those reported for similar compounds in the [14-16] H2SO4 and natural product (NP)) and similar literature , the assignments including the fractions were mixed together. attachment of glucose residue to C1' were Based on TLC and preliminary HNMR analysis, the confirmed and the chemical structure of (1) was fraction 3 was considered to be rich in phenolic defined as 3-(4-hydorxy phenyl)propyl β-D- compounds which after concentration by rotary Glucopyranoside (Fig. 1). evaporator, subjected to HPLC using a semi preparative C18 column (Novapak®, 7.8x300 mm) Characterization of compounds (2) and H2O:CH3OH (65:35) mobile phase in isocratic mode, resulted the pure compounds (1) (10 mg) ESIMS spectra of compound (2) in the negative- and (2) (16 mg). ion mode showed a pseudomolecular ion peak at m/z 341 [M-H], while the HNMR spectrum exhibited the characteristic signals of aromatic Results protons (δH 6.28 -7.14) as well as an isolated doublet at δH 4.23 (2H, dd, J= 5.71, 1.26), an Final purification of the main phenolic fraction anomeric proton signal at δH 4.91(1H, d, J= 7.37) resulted to the isolation of 2 pure phenyl and overlapped proton signals of sugar residue propanoid glycosides. Structure elucidation of the (δH 3.33-3.79), altogether suggested the chemical isolated compounds were performed by structure of compound (2) as a glycosilated comprehensive spectroscopic methods, resulted phenolic compound. to the identification of coniferyl β-D- CNMR spectrum of compound (2) showed 16 Glucopyranoside (Coniferin, Abietin) and 3-(4- carbon signals included those related to OCH3 hydroxyphenyl) propyl β–D-Glucopyranoside. carbon (δC 56.74), C2-C6 carbon signals of sugar residue (δC 62.52-78.23), sp2 carbon signals (δC Characterization of compounds (1) 111.42-150.91) and anomeric carbon signal (δC 102.77), which in agreement with MS and HNMR ESIMS spectra of compound (1) in the negative- spectral data confirmed the glycosilated phenolic ion mode showed a pseudomolecular ion peak at nature of compound (2) and suggested the m/z 313 [M-H], while the HNMR spectrum molecular formula as C16H22O8 (Table 2). exhibited 2 characteristic aromatic proton signals Finally by determination of low and high range 1H- 13C connectivities through HSQC and HMBC (δH 6.71 and δH 7.08), 2 sp3 proton signals (δH 2.85 Copyright © 2018 by Kermanshah University of Medical Sciences JRPS, 2018, 7(2), www.SID.ir116-122| 118 Archive of SID Ghaffari and Sadeghi Dinani experiments, and comparing the spectral data C4 were confirmed and the chemical structure of with those reported for similar compounds in the (1) was defined as coniferyl β-D-Glucopyranoside literature [14,17-19], the assignments specially the (Coniferin, Abietin) (Fig. 2). attachment of OCH3 to C3 and glucose residue to 1 13 Table 1.
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