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Polyphenol-rich extracts from certain berries inhibited α-glucosidase activity in vitro. The two most effective berry extracts, from black currant and rowanberry, inhibited α-glucosidase with IC 50 values respectively of 20 and 30μg GAE/ml and were as effective as the pharmaceutical inhibitor, acarbose. These berry extracts differed greatly in their polyphenol composition: black currant was...
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