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Pharmacognostic and Phytochemical Investigation of the Stem Bark of Bauhinia Purpurea

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Pharmacognostic and Phytochemical Investigation of the Stem Bark of Bauhinia Purpurea Kondongala Subraya Chandrashekar et al. IRJP 2012, 3 (2) INTERNATIONAL RESEARCH JOURNAL OF PHARMACY www.irjponline.com ISSN 2230 – 8407 Research Article PHARMACOGNOSTIC AND PHYTOCHEMICAL INVESTIGATION OF THE STEM BARK OF BAUHINIA PURPUREA Gupta Daksha, Kondongala Subraya Chandrashekar*, Richard Lobo, Gupta Nilesh, Kalarikkal Reshma Department of Pharmacognosy, Manipal College of Pharmaceutical Sciences, Manipal University, Manipal- 576104, Karnataka, India Article Received on: 08/12/11 Revised on: 11/01/12 Approved for publication: 19/02/12 *Kodongala Subraya Chandrashekar, Department of Pharmacognosy, Manipal College of Pharmaceutical Sciences Manipal University, Manipal-576104, India E-mail: [email protected] ABSTRACT This paper presents a detailed pharmacognostical and physicochemical study of the stem bark of the plant Bauhinia purpurea L., Fabaceae, an important plant in Indian system of medicine. There were no pharmacognostical reports of the stem bark of this plant, particularly to determine the anatomical and other physicochemical standards required for its quality control. The stem bark were studied using light, confocal microscopy. The physicochemical, morphological and histological parameters carried out as per WHO guidelines of quality control methods for medicinal plant materials. The present study aims at developing a standardize profile of the stem bark of Bauhinia purpurea which would be of immense use to identify and establish the authenticity of the plant Bauhinia purpurea. KEY WORDS: Bauhinia purpurea L., Fabaceae, Triterpenoids, Sterols. INTRODUCTION Preparation of extract 6, 7 The well-known and well established genus Bauhinia The stem bark of Bauhinia purpurea L. were dried in hot air comprises of trees and shrubs that grow in warm climate. It is oven at 50-60º C for 5-6 days and then grinded to a fine rare in southern most districts, 5-7m tall tree in deciduous powder in a grinder. The powdered plant material (2.5 kg) forests which is often planted in gardens along roadside for was subjected to maceration using methanol. Yields of its large purple beat flowers. The leaves are 10–20 cm long extracts were methanol (4.92%) and broad, rounded, alternate and bilobed at the base and Organoleptic evaluation apex. The flowers are conspicuous, pink, and fragrant, with Fresh bark was moist, flat strips, outer surface was dark five petals. The fruit is a pod 30 cm long, containing 12 to 16 brown and inner surface was white in colour. Odour was seeds and have long seeds as pea. Flowers and fruits appear sweet and characteristic and fracture was fibrous. Dried bark in the month of December. Synonyms/Common names of was hard and contracted, outer surface was blackish brown plant Bauhinia purpurea is Purple Orchid tree, Mandaram, and inner surface was brownish buff coloured. Odour was etc1. slight and fracture was splintery. Geographical distribution- B. purpurea is native to South China (which includes Hong Kong) and South-eastern Asia and it is found throughout India, ascending to an altitude of 1300m in Himalaya2. Plant profile: The different species of Bauhinia viz., B. reticulata, B. rufescens and B. variegata have been traditionally used to treat roundworm infections, conjunctivitis, anthrax, ulcerations, dysentery, blood- poisoning, leprosy, lung and skin diseases in Africa; while in India, extracts of the bark of B. variegata is used for Fresh Bark Dried Bark treatment of cancer. Leaves are used as a plate for food and fodder during lean Pharmacognostical study period 3, bark used as fibre, in dyeing and tannin extraction Materials and its decoction is used in diarrhea. The decoction of root is Compound microscope, stage micrometer, glass slide, cover used for expelling gases, flatulence and gripping pain from slip, watch glass, Leica DMLS microscope attached with the stomach and bowels. The decoction of flower works as a Leitz MPS 32 camera, digital electronic balance (Dhaus maturant for boils and abscesses 4. Root bark of Bauhinia Corp), grinding mixer, hot air oven (Osworld), sonicator purpurea L. contains flavones glycoside 5. (Lequitron), silica crucible, ash less filter paper (Whatman MATERIALS AND METHODS no.44), petridish, UV apparatus, stoppered conical flask, The stem bark of Bauhinia purpurea L. were collected from magnetic stirrer, alcohol (95%), chloroform water, chloral local area of Manipal, Karnataka, India during August 2011 hydrate solution, phloroglucinol, hydrochloric acid, sudan and were authenticated by Dr. Chandrashekar KS, red-III, ruthenium red, glycerin, sodium hydroxide, Department of Pharmacognosy, Manipal College of petroleum ether, acetone, benzene, chloroform and water. Pharmaceutical Sciences, Manipal University, Manipal. Page 166 Kondongala Subraya Chandrashekar et al. IRJP 2012, 3 (2) Anatomical study6 water-soluble ash. The percentage of water-soluble ash was Free hand sections of the stem were taken and warmed with calculated with reference to air-dried drug. chloral hydrate to remove the coloring matter. Then uniform Extractive Value determination and clear sections were selected and stained with Coarsely powdered air‐dried material 4 g was placed in a phloroglucinol and HCl, mounted on a clean glass slide with glass stoppered conical flask and macerated with 100 ml of glycerin and covered with cover slip. The sections were then solvents (water, methanol, and chloroform) shaking viewed under low power 10 X and subsequently under high frequently, and then allowing it to stand for 18 hours. Filter it power 40 X. rapidly through whatman No. 1 filter paper, transfer 25 ml Photomicrography filtrate to flat‐ bottom dish and evaporate solvent on a water The microphotographs were taken using Olympus BX 41 bath. Dry at 105° C for 6 hours, cool in a desiccator for 30 microscope, attached with Olympus DP20 camera. minutes and weigh it immediately. Calculate the content of Powder analysis 6,8 extractable matter in % of air‐dried material. The powder of stem of B. purpurea was examined for its Moisture content microscopic characters. The powder was passed through 2gms drug was taken in a previously weighed china dish and sieve no. 60 and was boiled with chloral hydrate to remove heated in oven for 1 hr. at 105° C. China dish was cooled and coloring matter and viewed under microscope for calcium weighed. Again heated in oven for 1 hr. and reading is taken. oxalate crystals and other characters. The clarified powder This step is repeated until the weight becomes normal. was later stained with phloroglucinol in the presence of Preliminary Screening 6.7,11 hydrochloric acid for the lignified structures like stone cells Tests for alkaloids performed were -Mayer’s test, and viewed under microscope as described earlier. Dragendroff’s test, Wagner’s test, Hager’s test, Test for Physicochemical Constants9,10 saponins-Foam test, Sodium bicarbonate test, Test for Ash Value carbohydrates-Molisch’s test, Fehling’s test, Benedict’s test Ash content of the crude drug is generally taken to be the Test for glycosides- Borntrager’s test, Modified Borntrager’s residue remaining after incineration. It represents the test, Baljet`s test, Legal`s test, Liebermann`s test, Test for inorganic salts naturally occurring in the drug and adhering to steroids-Libermann-Burchard test, Salkowaski test for it, but may also include inorganic matter added for the tannins and phenolic compounds-Dilute ferric chloride, Lead purpose of adulteration. Total ash is the residue remaining acetate, Gelatin, Aqueous bromine solution, Test for after incineration. Acid insoluble ash is the part of the total flavonoids-Shinoda’s test. ash, which is insoluble in dilute hydrochloric acid. Water- TLC studies soluble ash is the part of total ash, which is soluble in hot Thin layer chromatography analysis was carried out was water. Total ash was determined by about 2 g of the carried out on silica gel G (E. Mark, Germany) with powdered drug in a tared silica crucible. The powdered drug petroleum ether: chloroform (90:10) as the solvent system. was spread as a fine layer at the bottom of the crucible. The The spot was developed by spraying the plate with solution I crucible was incinerated at a temperature not exceeding (5% ethanolic sulfuric acid), followed immediately by 512°C until free from carbon. The crucible was cooled and solution II, then heated for 5-10 min at 100O C under weighed. The procedure was repeated till a constant weight observation. was observed. The percentage of the total ash was calculated RESULTS AND DISCUSSION in triplicate with reference to the air dried drug. Acid Transverse Section of bark shows few layers of cork. Outer insoluble ash was determined by the following procedure. layers contains reddish brown content and inner layers are The ash obtained as described in the determination of total colourless. Phellogen and Phelloderm are indistinguishable ash was boiled with 25 ml of dil. hydrochloric acid for 5 min. from each other. Cortex is composed of 10-15 layers of The insoluble ash was collected on an ash less filter paper by parenchyma cells. Stone cells are scattered in the middle of filtration and it was washed with hot water. The insoluble ash parenchyma. Starch grains and calcium oxalate crystals are was transferred into a tared silica crucible, ignited, cooled found in some parenchyma cells. Stone cell layer is found in and weighed. The procedure was repeated till a constant between cortex and secondary phloem. Secondary phloem weight was observed. The percentage of acid insoluble ash composed of phloem parenchyma, phloem fibre and was calculated with reference to the air-dried drug .Water medullary rays Phloem parenchyma is composed of soluble ash was determined as follows. The ash obtained as parenchyma cells containing starch grains and calcium described in the determination of total ash was boiled for 5 oxalate crystals. Medullary rays traverse radially the phloem min with 25 ml of water. The insoluble matter was collected parenchyma, 1-3 cell wide and extend upto stone cell layer on an ashless filter paper and washed with hot water.
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