ANTIDIABETIC AND ALDOSE REDUCTASE ACTIVITIES OF BIFLAVANONES OF GARCINIA-KOLA

Abstract— Kolaviron, a mixture of C‐3/C‐8 linked biflavonoids obtained from Garcinia kola produces significant hypoglycaemic effects when administered intraperitoneally to normal and alloxan diabetic rabbits at a dose of 100 mg kg−1. The fasting blood sugar in normoglycaemic rabbits was reduced from 115 mg/100 mL to 65 mg/100 mL after 4 h. In alloxan diabetic rabbits, the blood sugar was lowered from 506 mg/100 mL to 285 mg/100 mL at 12 h. The hypoglycaemic effects have been compared with those of tolbutamide. Kolaviron inhibited rat lens aldose reductase (RLAR) activity, with an IC50 value of 5.4 × 10−6. The significance of these findings in the potential use of kolaviron as an antidiabetic agent is discussed. 1990 Royal Pharmaceutical Society of Great Britain