| dc.description.abstract | Tea is one of the major product in food industries. One type of its product is green tea. Diabetes is a chronic disease that occurs either when the pancreas does not produce enough insulin or when the body cannot effectively use the insulin. Green tea has an active compound which inhibits α-amylase and α-glucosidase enzyme performance. Natural alpha-amylase and alpha-glucosidase inhibitors from food-grade plants offer an attractive strategy either to prevent or manage type 2 diabetes via controling starch breakdown and intestinal glucose absorption. The research focuses on evaluating the correlationship between tea’s anti diabetic activity and brewing’s time and temperature. In this study, six different extracts based on combination of temperature (in 70 and 100oC) and brewing time (in 5, 15, and 30 minutes) were investigated for alpha-amylase and alphaglucosidase potential inhibitor. Furthermore, the influence of the in vitro digestion condition to the activity of the enzyme was also performed in this study. The enzyme inhibitory and total phenol were measured by spectrophotometric while tannin content was measured by gravimetric method. Results showed that green tea brewed by 100oC 5 minutes and 100oC 15 minutes can optimally inhibit alphaamylase at initial extract (as an estimation of salivary alpha-amylase), 70oC 5 minutes, 70oC 30 minutes, 100oC 5 minutes, and 100oC 15 minutes inhibit alpha-amylase at pH digestion-controlled (as an estimation of pancreatic amylase) higher than another green tea extracts. Green tea brewed by 70oC 30 minutes can optimally inhibit alpha-glucosidase enzyme, both at initial extract and pH digestion-controlled extract. After passed through the in vitro digestion, green tea extracts showed decreasing of inhibition values both of alpha-amylase and alpha-glucosidase. | en |
