Sumonthip Kongtun. Chemical study of bioactive constituents from trichosanthes cucumerina root and fruit juice. Doctoral Degree(Pharmaceutical Chemistry and Phytochemistry ). Mahidol University. : Mahidol University, 2003.
Chemical study of bioactive constituents from trichosanthes cucumerina root and fruit juice
Abstract:
Trichosanthes cucumerina L. seeds have been used as remedies for dysentery,
coughs and as an emetic. A previous phytochemical investigation in cucurbitaceous
plants revealed that the triterpenes have interesting bioactivities, For example,
cucurbitacins elicit catharsis and cytotoxicity, and bryonolic and bryononic acids
possess anti-inflammatory property. This research aimed to find the bioactive
constituents from T. cucumerina root and to establish a validated method for
quantitative High-performance liquid chromatography (HPLC) analysis of the isolated
cucurbitacins.
The dichloromethane extract of the root was subject to chromatographic
separation, which the isoprenoid derived compounds could be isolated. The structures
were identified using NMR spectroscopy. They were bryonolic acid (SK1),
chondrillasteryl-3β-O-glucopyranoside (SK2), bryononic acid (SK3), cucurbitacin
B(SK4) and dihydrocucurbitacin B (SK5). The dichloromethane root extract, the
isolated compounds and the fruit juice were tested for antimalarial activity. Compound
SK4 and the fruit juice were antimalarial active with IC50 value of 0.625 μg/ml and
0.089 μg/ml, respectively. In addition, compound SK1 was proved as an antipapilloma
viral agent with the ED50 value of 1.5 ng/ml. This is the first report on the antiviral
activity of bryonolic acid, which is the main constituent in T. cucumerina root.
The quantitative HPLC analysis was performed on the isolated cucurbitacin B
(SK4). This analysis used the 5 μm Hypersil BDS C18 column (250 x 4.6 mm, i.d.),
the solvent system of acetonitrile-water (40:60) and a UV detector at 210 nm. The
HPLC analytical method was validated according to the USP 26 requirement