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Aqueous extracts of young (7-day-old) Malay cherry ( Lepisanthes alata ) leaves were incorporated into wheat and rice flours to evaluate their inhibitory activities against α-amylase and α-glucosidase. HPLC-ESI/MS² results showed that the active components in young leaves were proanthocyanidins with lower mean degrees of polymerisation (≤10). The IC 50 of the aqueous extracts of young leaves were 2.50 ± 0.03 and 12.91 ± 0.29 µg/mL, against α-amylase and α-glucosidase, which make them less active compared to the mature leaves. In contrast, total proanthocyanidins in aqueous extracts decreased as the leaves matured, indicating that the compounds in the mature leaves have much higher activity. However, there was no significant difference in the digestibility of wheat noodles incorporated with the aqueous extracts from either young or mature leaves. Interestingly, with regard to rice noodles, their digestibility was mostly reduced by incorporating aqueous extracts of young leaves compared to using mature leaves.

Impact of Maturity of Malay Cherry (Lepisanthes alata) Leaves on the Inhibitory Activity of Starch Hydrolases