*Corresponding Author:
S. B. Kalidhar
Department of Chemistry, Haryana Agricultural University, Hisar-125 004, India
E-mail: [email protected]
Date of Submission 3 January 2008
Date of Revision 26 December 2008
Date of Acceptance 21 March 2009
Indian J Pharm Sci, 2009, 71 (2): 129-130  

Abstract

Chemical investigation of fruits of Crataeva nurvala has revealed the presence of four known compounds which are pentadecane, octanamide, 12-tricosanone and friedelin. These compounds have been characterized on the basis of spectral and other data. These are being reported for the first time from the fruits of this plant.

Keywords

Crataeva nurvala, chemical components, pentadecane, octanamide, 12-tricosanone, friedelin

Crataeva nurvala (family: Capparidaceae) is commonly known as barna and varuna[1]. It is distributed, wild or cultivated, throughout India and tropical regions of the world[2]. Fruits are berry-like, globose or oblong; edible and used as astringent[3]. Fruiting occurs in April-June. Seeds are embedded in yellow pulp. Rind of the fruit is used as a mordant in dyeing[4]. As the fruits of the plant have not been extensively studied for chemical components, the present study was taken up.

Melting points were determined on a Ganson Electrical Melting Point Apparatus. 1H NMR spectra were recorded on a Bruker AC 300 MHz NMR Spectrometer using TMS as an internal standard. Chemical shifts are given in δ (ppm) and CDCl3 was used as solvent. IR spectra were recorded on a Hitachi 570 Infrared Spectrophotometer. Mass Spectra were obtained on a VG 70 S 11-250 J GCMS-DS Spectrometer.

Fruits of C. nurvala (5 kg) were collected from Botanical Gardens, HAU, Hisar. These were crushed, dried and extracted with hot methanol. The plant material (1 kg at a time) had been taken into a 5 l RB flask fitted with a water condenser for refluxing the material with MeOH. Refluxing was carried out for 6 h. The process had been repeated three times to prepare methanol extract of 5 kg of the material. The methanol extract was concentrated over water bath under reduced pressure. Extractives were subjected to silica gel (60-120 mesh) column chromatography. Four compounds were obtained.

Compound A (n-pentadecane, 1), molecular formula C15H32, was obtained on elution with petroleum ether as an oily liquid, 5 ml, b.p. 270o[5]. IR (KBr, νmax, cm-1): 600, 800, 1026, 1261, 1378, 1441, 2362. 1H NMR (CDCl3, δ): 1.25 (26 H, br, 13* -CH2-), 0.88 (6 H, t, J 7.5 Hz, 2* -CH3). GCMS (m/z): 212 (M+).

Compound B (octanamide, 2), molecular formula C8H17NO, was obtained on elution with benzenepetroleum ether (1:3) as a colourless solid, 10 mg, m.p. 112 o (literature m.p. 110-112 o)[6]. IR (KBr, νmax, cm-1): 756, 802, 1026, 1235, 1372, 1740, 2925, 3456. 1H NMR (CDCl3, δ): 5.13 (2 H, s, CONH2), 2.02 (2 H, t, J 7.5 Hz, -CH2CONH2), 1.66 (2 H, br,-CH2CH2CONH2), 1.25 (8 H, br, 4* -CH2-), 0.88 (3 H, t, J 7.5 Hz, 2* -CH3). GCMS (m/z ): 143 (M+).

Compound C (12-tricosanone, 3), molecular formula C23H46O, was obtained on elution with benzene as a colourless solid, 10 mg, m.p. 69o (reported m.p. 68o)[6]. IR (KBr, νmax, cm-1): 765, 1012, 1257, 1460, 1617, 1733, 2916. 1H NMR (CDCl3, δ): 2.33 (4 H, J 7 Hz, -CH2CO-), 1.54 (4H, m, 2* -CH2CH2CO-), 1.26 (32 H, br, 16* -CH2-), 0.88 (6 H, t, J 7.0 Hz, 2* -CH3). GCMS (m/z): 338 (M+).

Compound D (friedelin, 4), molecular formula 426, was obtained on elution with ethyl acetate-benzene (1:19) as a colourless crystalline solid, 15 mg, m.p. 260 o (reported m.p. 259-261 o)[7]. It gave pale brown colour on reaction with Ac2O/H2SO4. IR (KBr, νmax, cm-1): 980, 1053, 1073, 1176, 1205, 1220, 1377, 1389, 1715. 1H NMR (CDCl3, δ): 1.25-2.31 (25 H, m, 11*-CH2- , 3* -CH< ), 1.16 (3H, s, -CH3), 1.05 (3H, s, -CH3), 1.01 (6 H, 2* -CH3), 0.97 (3H, s, -CH3), 0.88 (6H, s, 2* -CH3). GCMS (m/z): 426 (M+).

The four known compounds are being reported for the first time from the fruits of this plant.

Acknowledgements

Authors are grateful to Dr U. K. Varshney, In charge, Botanical Gardens, Hisar, for supplying the plant material.

References