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Isolation and Characterization of Stigmast-5-en-3-ol from Heartwood of Berberis aristata

Deepti Katiyar1*, Vijender Singh2, Sadaf J. Gilani3, Richa Goel1, Amita Vats4, Umakant Bajaj5
  1. Department of Pharmacognosy, KIET School of Pharmacy, Ghaziabad, U.P.
  2. BBS Institute of Pharmaceutical & Allied Sciences, Greater Noida, U.P.
  3. Department of Pharmaceutical Chemistry, KIET School of Pharmacy, Ghaziabad, U.P.
  4. Department of Pharmaceutics, KIET School of Pharmacy, Ghaziabad, U.P.
  5. Department of Pharmacology, KIET School of Pharmacy, Ghaziabad, U.P.
Corresponding Author: Deepti Katiyar, Assistant Professor, KIET School of Pharmacy, Ghaziabad, India. E-mail: katiyar_deepti@yahoo.co.in
Date of Submission: 09-11-2013 Date of Acceptance: 19-12-2013 Conflict of Interest: NIL Source of Support: NONE
Copyright: © 2014 Deepti Katiyar et al, publisher and licensee IYPF. This is an Open Access article which permits unrestricted noncommercial use, provided the original work is properly cited.
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Abstract

Various studies have already been performed involving the roots and stems of Berberis aristata DC var aristata (Berberidaceae) and thus the present investigation has been carried out for the phytochemical study of ethanolic extract of the heartwood of Berberis aristata. The drug(1.8kg) was exhaustively extracted in 95% ethanol using Soxhlet apparatus. The column chromatography was performed for isolating the various phytoconstituents using the solvents of increasing polarity. The isolated compounds were structurally elucidated using various spectral data analysis, i.e., IR, 1HNMR, 13CNMR and positive ion FAB MS. One of the isolated compounds was characterized as Stigmast-5-en-3-ol.

Keywords

Heartwood, Berberisaristata, Soxhlet, Column, Stigmast-5-en- 3-ol

Introduction

Berberis aristata DC var aristata (Berberidaceae), commonly known as Rasaut or Chitra in Hindi, Darhald in Urdu and Darvi in Sanskrit[1], is an erect, glabrous, spinescent, deciduous shrub, 3-6m in height[2] with obovate to elliptic, subacute to obtuse, entire or toothed leaves, yellow flowers in corymbose racemes and oblong-ovoid to ovoid, bright-red berries[3] mostly found in Nepal, grown in Nilgiris at an altitude of 1000-2400m and temperate Himalayas at an altitude of 1000- 3000m[4].
Berberine, an alkaloid is the chief constituent of the roots and stem bark of Berberis aristata[5]. Other constituents include berbamine, aromoline, palmatine and oxycanthine. Phytoconstituents isolated from the flowers of Berberis aristata include E-caffeic acid, quercetin, chlorogenic acid, meratin and rutin[6] while those from roots showed the presence of alkaloids, flavonoids, glycosides, saponins and sterols and the absence of terpenoids[7]. New protoberberine alkaloidskarachine and taxilamine have been isolated and characterized [8]. Anti-carcinogenic[9], anti-diarrhoeal[8], antihepatotoxic[ 10], anti-inflammatory[9], anti microbial[11], anti-pyretic[12], antihyperglycaemic[ 13], anti-oxidant[14], antimalarial[ 15], immunomodulatory[16] and tuberculostatic activities[17]have been studied on various parts of Berberis aristata. Majority of studies have been performed on roots and stems of Berberis aristata, so the present study involves the phytochemical investigation of ethanolic extract of the heartwood of Berberis aristata.

Materials and Methods

All melting points were determined in Centigrade scale in one-end open capillary on Perfit melting point apparatus and are uncorrected. IR spectra were recorded on Perkin Elmer spectrum RX 1 model. 1H NMR and 13C-NMR spectra were scanned on Bruker DRX-300 NMR (300MHz) instrument in CDCl3 and D2O using Tetramethylsilane(TMS) and CDCl3 as the internal standard and coupling constants (J values) are expressed in hertz (Hz).Mass spectra were recorded by affecting electron impact ionization at 70eV on a Jeol SX-102 (FAB) mass spectrometer equipped with direct inlet prob system. The m/z values of the more intense peaks are mentioned and the figures in bracket attached to each m/z values indicated relative intensities with respect to the base peak. The solvents used were of Qualigens LR grade. Silica gel (Qualigen 60-120 μm mesh) was used for column chromatography. TLC was performed on plates coated with silica gel G (Qualigen). Anhydrous sodium sulphate was used for drying all the solvents used during the research work.

Plant Material

The plant material was procured from AIMIL Pharmaceuticals, New Delhi. It was authenticated as Berberis aristata by Dr.M.P.Sharma, Reader, Department of Botany, Jamia Hamdard, New Delhi and a voucher specimen is preserved in the herbarium section of Department of Pharmacognosy, R.I.T., Greater Noida, Uttar Pradesh.

Extraction

The plant material (1.8kg) was air dried, crushed to smaller pieces, re-dried, coarsely powdered and was then exhaustively extracted with ethanol (95%) in a Soxhlet apparatus for 72 hours. The ethanolic extract was dried and dark brown mass, 50gm (2.77%) was obtained.

Preparation of Slurry

The concentrated extract of the drug was taken in a china dish and heated continuously on a water bath, gradually adding methanol in small portions with constant stirring till desired consistency was obtained. Weighed quantity of silica gel (60-120 mesh) was added slowly with mixing with a stainless steel spatula until a desired consistency was obtained. It was dried in air; the larger lumps were broken-up and finally passed through a sieve (No. 8) to get a uniform particle size.

Packing of Column

The lower end of a clean dry column was plugged with adsorbent cotton. The column was then half filled with petroleum ether. Silica gel was added in small proportions and allowed to settle down gently until the necessary length of the column was attained. All the air bubbles were allowed to escape by running the column blank thrice with solvent. The dried silicagel slurry of the extract was packed in the column and plugged with the adsorbent cotton and then eluted successively in the order of increasing polarity with different solvents. The development and elution of the column was carried out with successive series of solvents in various combinations, viz., petroleum ether, chloroform in petroleum ether (0.5%, 1%, 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%) chloroform(100%), and methanol in chloroform. The fractions collected were subjected to thin layer chromatography. Chromatographically identical fractions were combined and concentrated.

Isolation of Phytoconstituents

Elution of the column with chloroform (100%) afforded a colourless amorphous powder which was recrystallized from chloroform:methanol (1:1), yield 125mg (0.25%);Rf: 0.62(petroleum ether: chloroform: methanol, 5:2:2);m.p.: 1370 C-1380C;IR max (KBr): 3465, 2955, 2845, 1640, 1475, 1365, 1210, 1105 cm-1;1HNMR (CDCl3, 300MHz):  5.30 (1H, d, J=5.5Hz, H-6), 3.51 (1H, brs, w1/2=16.5Hz, H-3), 1.01 (3H, brs, Me-19), 0.97 (3H, d, J =6.5 Hz, Me-21), 0.86 (3H, d, J=6.0 Hz, Me-29), 0.85 (3H, d, J=6.0 Hz, Me- 27), 0.83 (3H, t, J=6.2Hz, Me-26), 0.67 (3H, brs, Me- 18);13CNMR (CDCl3, 300MHz): 37.33 (C-1), 31.63 (C- 2), 69.51 (C-3), 41.98 (C-4), 141.17 (C-5), 119.94 (C- 6), 31.15(C-7), 31.81 (C-8), 49.57 (C-9), 36.74 (C- 10), 21.66 (C-11), 39.80 (C-12), 41.98 (C-13), 56.04 (C-14), 24.19 (C-15), 28.60(C-16), 55.41(C-17), 11.36 (C-18), 19.30 (C-19), 36.74(C-20), 18.75(C-21), 33.30(C-22), 25.73(C-23), 45.14 (C-24), 29.15 (C-25), 20.37 (C-26), 19.30(C-27), 23.56(C-28), 11.03 (C- 29);FAB MS m/z:414 [M]+ (C29H50O) (22.3), 399 (21.6), 397 (33.1), 395 (35.2), 381 (16.5), 365 (11.3), 339 (12.6), 371 (17.8), 273 (12.5), 255 (13.2), 239 (9.6), 213 (15.6), 198 (17.9), 159 (39.7), 145 (52.6), 119(62.6),105 (100).

Results

The Compound, a phytosterol, was obtained as a colourless powder from chloroform eluants. It responded positively to Liebermann-Burchardt test for steroids. Its IR spectrum showed absorption band for hydroxyl group (3465 cm-1) and unsaturation (1640 cm-1). Its mass spectrum had a molecular ion peak at m/z 414 corresponding to a steroidal formula, C29H59O. It indicated five double bond equivalents;four of them were adjusted in the steroidal carbon skeleton and one in the olefinic linkage. The other diagnostic peaks were generated at m/z 399 [M-Me]+, 395[M-H2O]+, 273[M-side chain]+, 213[255-ring D fission] +, 255[273-H2O]+ and 198[213- Me] +. These fragments suggested that it was a C29 sterol possessing one double bond in the steroidal skeleton and a C10 saturated side chain. The ion fragments at m/z 55[C1,10- C 4,5 fission- H2O] + , 69[C2,3-C5,10-C6,7 fission]+, 83[C2,3-C5,10-C7,8 fission]+, indicated that the hydroxyl group was located in ring A which was placed at C-3 on biogenetic grounds. The mass spectrum indicated the presence of an ethyl group in the side chain which was placed at C-24 on the basis of biological analogy as well as similarities in chemical shifts of the protons and carbons of the side chain with related compounds. Therefore, it had identical framework to that of -sitosterol.
The 1H NMR spectrum exhibited a one proton doublet at  5.30 (J=5.5 Hz) assigned to H-6 proton. A broad one-proton multiplet at  3.51 with w1/2 = 16.5 was ascribed to -oriented H-3 methine proton (axial) interacting with C-2 equitorial, C-2 axial and C-4 equitorial protons. Three doublets, integrating three protons each, at  0.97 (J=6.5Hz), 0.86 (J=6.0Hz) and 0.83 (J=6.0Hz) were due to C-21, C-26 and C-27 secondary methyls, respectively, and a three-proton triplet at  0.82 (J=6.2Hz) was ascribed to C-29 primary methyl protons. The remaining two tertiary C-18 and C-19 methyl signals appeared as singlets at  0.67 and 1.01 respectively. The presence of all the methyl in the region  0.67 - 1.01 suggested that these functionalities were attached to saturated carbons. The remaining methylene and methine protons resonated in the region  2.28-1.03. Further evidence for the structure was provided by its 13C NMR spectral data, which showed the was confirmed by comparison of chemical shifts of carbons and protons of the side chain in the 1H and 13C spectra with -sitosterol and other related sterols, e.g., stigmast-4-en-6-ol- 3-oneand lawsaritol. The H3-29 resonance of 24-R configuration ( 0.83) was more upshielded as compared to 24S resonance (0.86).Based on these evidences the structure of the compound has been formulated as stigmat-5-en-3-ol.

Discussions

The result summarizes that Stigmast-5-en-3-ol (- Sitosterol), a phytosterol was isolated and characterized from ethanolic extract of the heartwood of Berberis aristata. The chemical structure was elucidated by means of various physical (solvent extraction, TLC, Column chromatography) and spectral techniques. - sitosterolis beneficial in heart disease and high cholesterol (inhibits cholesterol absorption in the intestine). The liver function activity (GDP, GOP) can be improved with -sitosterol, and this can reduce prostate cancer and colon-cancer cell growth. It exhibits anti-pyretic, anti-inflammatory, anti-ulcer, anti-arthritic, insulin releasing and oestrogenic effects. It is also used for boosting the immune system and shows beneficial effects in HIV/AIDS, tuberculosis, psoriasis, allergies, cervical cancer, fibromyalgia, systemic lupus erythematosus (SLE), asthma, hair loss, bronchitis, migraine headache, and chronic fatigue syndrome. In conclusion, -sitosterol obtained from ethanolic extract of the heartwood of Berberis aristata in our investigation appear to be beneficial for various human ailments.

Acknowledgements

The authors are thankful to the Head, Department of Pharmacognosy, for providing laboratory facilities and to the Head, SAIF, CDRI, Lucknow, for spectral analysis. The authors are also thankful to Dr. M. P. Sharma for authenticating the drug.

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