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Proximate and Spectroscopic Analysis of Centrosema Pubescens Benth

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Proximate and Spectroscopic Analysis of Centrosema Pubescens Benth Journal of Advancement in Pharmacognosy Volume 1 Issue 2 Proximate and Spectroscopic Analysis of Centrosema pubescens Benth Thamizh Selvam N1, Sudhakar D2 1Assistant Director, 2Director (Institute) Biochemistry, Department of Biochemistry and Pathology, National Ayurveda Research Institute for Panchakarma,(CCRAS, Ministry of AYUSH, Govt. of India), Cheruthuruthy, Thrissur, Kerala, India *Corresponding Author Email Id: [email protected] ABSTRACT Centrosema pubescens commonly known as ‘Butterfly pea’ is a perennial herb under the family of Fabaceae. The plant is used as forage, manure and used as one of the key ingredients in broiler chicken feed as it contains rich of proteins and minerals. As the plant has not been explored much for their detailed chemical characteristics and medicinal value, the present study scientifically documents the complete proximate analysis, physico-chemical nature, phyto-chemical characteristics and spectroscopic analysis of various solvent fractions of C. pubescens. The study gives the insight of chemical constituents of plant and recommends the researchers for taking biopotency studies to explore its medicinal value. Key Words: Centrosema pubescens, butterfly pea, proximate analysis, spectroscopy studies INTRODUCTION mm in size, brownish-black, mostly Centrosema pubescenscommonly known withdark mottles [2-4]. as ‘Butterfly pea’ is a legume in the family of Fabaceae. This plant is native to Centrosema pubescens is grown as a cover Central and South America and cultivated crop as it naturally supresses weeds and in tropical regions as forage for livestock widely used as forage. The plant is well [1]. C. pubescens is a perennial herb that adapted to tropical conditions and altitudes can reach a height of 45 cm. The root below 600m from sea level. Due to system can reach up to 30 cm in depth, richness of protein and minerals the C. frequently in association with Rhizobium, pubescens leaves are used as one of the nitrogen -fixing bacteria. Leaves are ingredients in cattle diet and broiler trifoliolate, leaflets up to 6.5 cm long, chickens. This plant is also used as green elliptic or oblong-lanceolate 1-7 cm long, manure crop in rubber, coconut and oil 0.5-4.5 cm wide, rounded at the base and palm plantation [5]. Like other N-fixing mostly acuminate at the apex, slightly legumes, Centro is soil improver and the hairy, especially on the lower surface. amount of nitrogen fixed by Centro is Inflorescences several-flowered, in leaf- average of 259 kg/ha with ranged from axils; flower cluster stalk 2.5-5.5 cm long. 126 – 395 kg/ha as reported [6-8]. Standard petal is up to 4 x 3.5 cm, mauve- purple with a white or yellowish central TAXONOMY [2,3] band often flanked by darker purple lines, Kingdom : Plantae velvet hairy outside with a short spur Unranked : Angiosperms outside just above the claw. Seeds Unranked : Eudicots transversely oblong to squarish with Unranked : Rosids rounded corners, 4-5 mm x 3-4 mm x 2 Division : Tracheophyta CR Journals (Page 7-15) 2021. All Rights Reserved Page 7 Journal of Advancement in Pharmacognosy Volume 1 Issue 2 Order : Fabales ash, acid insoluble ash, water soluble Family : Fabaceae extractive and alcohol soluble extractive Tribe : Phaseoleae were carried out as per the standard Genus : Centrosema protocols developed and standardized at Species: C. pubescens NARIP was used. Binomial name: Centrosema pubescens Benth. Phytochemical Analysis [12,13] Common name: Butterfly pea The phytochemical analysis was carried Synonyms: Centrosemamolle, Bradburya out as per the standard protocols that has pubescens (Benth.) Kuntz, been standardised in NARIP. It comprised Centrosemaferrugineum A. Rich of various tests including Froth’s test, Libermann Burchard test, Fehling’s test, MATERIALS AND METHODS Salkowski test, Dragendorff’s test, Keller Plant Collection and Authentication Killani test and Ellagic acid test. The fresh plant materials were collected from the Western ghat regions of Palakkad Spectrophotometric Analysis [14,15] District, Kerala, India. The collected plant Spectrophotometric characteristics were materials were authenticated at Pharmacy analysed for understanding the basic Department of National Ayurveda chemical profiling of study plant and to Research Institute for Panchakarma compare the proposition of major (NARIP) Cheruthuruthy. The plant compounds among different solvent material was processed and herbarium was extracts. The ethanolic extract, methanolic prepared as per the standard guidelines. extract, chloroform extract, petroleum Voucher specimen is maintained in the ether extract and aqueous extract of C. Department of Biochemistry and pubescens leaf at different concentrations Pathology, NARIP for ready reference. were used for spectroscopic analysis using the concerned solvent as blank. The Extraction [9] spectrum characteristics were measured The air-dried, powdered plant leaf material after standardizing the procedures and was extracted by various methods using analysis was confirmed by carrying out different solvents. The hot solvent triplicate analysis at 200-800 nm. extraction for 8 hours was done by Soxhlet method using ethanol. Methanolic extract Chemicals and Reagents was prepared by cold extraction method. The chemicals and reagents of AR grade The plant material was soaked in methanol purchased from make of Spectrum, Nice for overnight 10-12 hours and filtered and HiMedia were used for the present through Whatman filter paper No. 1. The study. aqueous extract was prepared as per the protocol prescribed in Ayurvedic Instruments pharmacopeia of India. The solvent was UV Spectrophotometer of Agilent- Cary removed under reduced pressure at 60 was used for spectroscopic analysis. suitable temperature using rotovac equipment. The solvent free extract was RESULTS AND DISCUSSION aliquoted and stored in refrigerated Centrosemapubescens was authenticated at condition for ready to use form. NARIP, Cheruthuruthy. The proximate composition study of shade dried leaf Physicochemical characteristics [10,11] showed the total ash content 7.11% (Table Physico-chemical analysis such as 1). Phytochemical study showed the moisture content, total ash, water soluble highly presence of tannins, saponins, CR Journals (Page 7-15) 2021. All Rights Reserved Page 8 Journal of Advancement in Pharmacognosy Volume 1 Issue 2 flavonoids, cardiac glycosides in the polar documented the data of ethanolic extract, solvent extracts including ethanol, methanolic extract, chloroform extract, methanol and water when compared with petroleum ether extract and aqueous non-polar solvent extracts of chloroform extract at different concentration levels and petroleum ether. and the study was confirmed by triplicate analysis. Methanolic extract showed high The phytochemical analysis was done for presence of flavonoids, alkaloids in the the ethanolic extract, methanolic extract, extract. Ethanolic extract showed presence chloroform extract, petroleum ether extract of tannins, and flavonoids, cardiac and aqueous extract of shade dried leaf. glycosides and alkaloids. Petroleum ether The presence of saponins, flavonoids, extract showed the presence of phenolic terpenoids and carbohydras compounds in compounds and flavonoids. Aqueous the extracts was documented (Table 2). extract contained all the above phytochemicals at different concentrations. Spectrophotometric analysis showed Spectroscopic studies confirmed the various prominent peaks in the spectrum of presence of various group of compounds 200-800 nm representing the presence of even at higher dilutions (Figure 1-7 and compounds like alkaloids, steroids and Table 3-9). flavonoids. The spectroscopy study Table 1. Physico Chemical Characteristics of Centrosema pubescens Shade Dried Leaf S No Proximate Compounds Centrosema pubescens (Shade dried Leaf) 1 Moisture content (%) 8.192 % 2 Total Ash (%) 7.110 % 3 Water Soluble Ash (%) 1.160 % 4 Acid Insoluble Ash (%) 2.924 % 5 Water Soluble Extractive (%) 15.379 % 6 Alcohol Soluble Extractive (%) 8.521 % Table 2. Phytochemical Characteristics of Centrosema pubescens (Shade Dried Leaf). Phytochemical Method Centrosema pubescensShade dried Leaf Compounds Ethanolic Methanolic Aqueous Chloroform Petroleum Extract Extract Extract Extract Ether Extract Tannins Ferric ++ ++ +++ + - Chloride Test Silver Nitrate ++ ++ +++ + - Test Saponins Froth’s Test + + +++ - - Terpenoids Salkowsky’s + ++ ++ - - Test Cardiac Keller-Killani + + ++ + - Glycosides Test Shinoda Test - + ++ - - Flavonoids Lead acetate ++ +++ +++ - - Test Alkaline ++ ++ + - - Reagent Test CR Journals (Page 7-15) 2021. All Rights Reserved Page 9 Journal of Advancement in Pharmacognosy Volume 1 Issue 2 Fehling ‘s + + ++ + ++ Carbohydrates Test Molisch Test ++ ++ +++ - - Benedict’s + + ++ ++ - Test Phytosterols Liebermann Burchad Test + + + - - Proteins Millon’s Test - - - - - Biuret Test - - + - - Dragendorff’s +++ +++ + - - Alkaloids Test Mayer’s Test ++ ++ +++ - - Hager’s Test ++ +++ +++ - - Wagner’s ++ ++ + - - Test Anthraquinones Modified - - - - - Brontrager’s Test +++ Highly present ++ Medium + Low - Nil Fig.1. UV Spectroscopic analysis of Ethanolic extract of Centrosemapubescensshade dried leaf at different concentrations. Table 3. Comparative data of Spectroscopic analysis of Ethanolic extract of Centrosema pubescensshade dried leaf at different concentrations Centrosema pubescens Leaf Ethanol Centrosema pubescens Leaf Ethanol extract Concentration 1.25% 200-800 nm Concentration 0.625% 200-800 nm Wavelength Absorbance Wavelength
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