Potent suppressive effect of green tea polyphenols on tobacco-induced mutagenicity.

Antimutagenic activity of green tea (Camellia sinensis) was studied using Salmonella typhimurium strains (TA 102) (Ames test). Aqueous tobacco extract was found to be mutagenic to S. typhimurium TA 102 at concentration of 50 mg/plate.

Partial purification of tumour reducing principle from Helicanthis elasticus (Fam. Loranthaceae).

Extracts from plants of Loranthaceae family collected from 15 host trees were screened for their cytocidal activity to tumour cells. Biologically active extracts prepared from Helicanthis elasticus grown on Mangifera indica and Citrus maxima (host trees) were partially purified by the gel filtration method. The purified material was found to be cytotoxic in vitro and reduced solid and ascites tumours in mice when given either simultaneously or prophylactically.