THE INFLUENCE OF AQUEOUS EXTRACT OF CORIANDRI (Coriandrum sativum L) FRUCTUS TO BLOOD GLUCOSE LEVEL IN GLUCOSE- PRE LOADED RATS

Coriander contains some active compounds capable of decreasing the level of blood glucose. Moreover, aqueous extract of coriander (Coriandrum sativum L.) fruits has insulin-releasing and insulin-like activities. This research has been performed to obtain information on the effect of aqueous extract of coriander fruits on the blood glucose level in glucose-preloaded rats. The study was conducted by employing a complete random design in male Wistar rats (age 2-2,5 months, 150-250g).After the design treatments, the blood samples were collected (100-200 ul) at certain time interval. The result of each group were compared and analysed using the Mann-Whitney non-parametric method (95%). The result showed that low doses (0.014 and 0.07 % w/v) of aqueous extract of coriander fruits were unable to decrease significantly (p>0.05) the blood glucose level in glucose-preloaded glucose. On the other hand, high doses, 0.35 and 1.75 % w/v, were capable to decrease significantly (p<0.05), which are 22.11 ± 3.09 and 18.41 ± 4.88 %, respectively. Nevertheless, in the present study, the highest hypoglycaemic effect of aqueous extract of coriander fruits still lower than that of tolbutamide (p<0.05).Keywords: coriander, hypoglycaemic, glucose, tolbutamid

COBALT INDUCTION ON BIOSYNTHESIS OF CYANOCOBALAMIN by Streptomyces olivaceus IFO 3409.

The structure of cyanocobalamin containing an essensial cobalt is as part the compound. The aim of this study was to investigate the influence of cobalt on biosynthesis of cyanocobalamin done by Streptomyces olivaceus IFO 3409. This experiment was carried out by cultivating S. olivaceus in fermentation medium contained glucose 1,5%, pepton 1%, yeast extract 0,25%, trace mineral and each of medium was added cobalt 5, 10, 20 ppm. Cyanocobalamin synthesized by the cells was harvested on the last exponential phase. The amount of cyanocobalamin was analyzed by spectrophotometer. The results show that no cyanocobalamin was produced by S. olivaceus culture without kobalt or treated with 5 ppm cobalt on medium. However cyanocobalamin was produced if the culture medium was treated with 10 and 20 ppm cobalt respectively. It was concluded that cobalt induced on cyanocobalamin biosyntesis, therefore optimation of adding kobalt might be examined on getting maximal cyanocobalamin produced by Streptomyces olivaceus IFO 3409.Key words: cyanocobalamin, cobalt, Streptomyces olivaceus IFO 3409