4,4?-Dimethylsterols, 4-methylsterols and 4-demethylsterols of Mangifera indica kernel fat.
Ali Z., Siddiqui H. L., Mahmud S., Waheed A., Hameed S.
Author Affiliation: ACRC, PCSIR Laboratories, Complex, Lahore-54600, Pakistan.
Pakistan Journal of Scientific Research 60 : 34-39
Abstract : The extracted unsaponifiable constituents 1.5-2.31% from kernels of Mangifera indica cultivars Chaunsa, Sindhri and Desi have been fractionated by preparative TLC into 4,4?-dimethylsterols; 15.1-16.0%, 4-methylsterols; 6.4-7.0% and 4-demethylsterols; 53.5-53.8% respectively. The 4,4?-dimethylsterol fraction contains the highest percentage of lupeol; 19.2-22.7%. The 4,4?-dimethylsterols; ?-amyrin, cycloartenol, ?-amyrin and 24-methylene cycloartanol were also identified by GLC. The gramisterol, lophenol, obtusifoliol and citrostadienol were tentatively identified in 4-monomethyl fractions. The gramisterol; 48.0-50.7% is predominant in this fraction, ?-sitosterol; 47-76%, stigmasterol; 12-23% and campesterol; 7-12% are the major constituents of 4-demethylsterols. The waste kernels fat is a rich source of sterols as compare to usual vegetable oils and fats.