本研究探討以50%甲醇、80%甲醇及沸水萃取牛樟芝菌絲體及發酵液濃縮物，所得之萃取物對腸道α-葡萄糖苷酶之抑制活性。試驗結果顯示牛樟芝的菌絲體及發酵萃取物都能抑制腸道α-葡萄糖苷酶的活性，且隨著萃取物濃度越高，對腸道α-葡萄糖苷酶之抑制活性也越高。不論是菌絲體或發酵液皆以80%甲醇萃取物的抑制活性最高，菌絲體萃取物之半抑制濃度為310.3 mg/mL，發酵萃取物之半抑制濃度為284.0 mg/mL。以菌絲體80%甲醇萃取物進行酵素抑制動力學分析，結果顯示萃取物對腸道α-葡萄糖苷酶的抑制機制為非競爭型抑制作用。研究結果顯示牛樟芝應可經由抑制α-葡萄糖苷酶活性，有效應用於餐後血糖值的控制。
The aim of this study was to evaluate the inhibitory activities of methanol and hot water extracts of Antrodia cinnamomea mycelia and cultural filtrate concentrate on intestinal α-glucosidase activity. There was a dose dependent percentage inhibition by the extracts against intestinal α-glucosidase. The enzymatic assay showed that 80% methanol extracts of both mycelia and cultural filtrate were more potent against intestinal α-glucosidase activity than 50% methanol extract and aqueous extract. IC50 values of 310.3 mg/mL and 284.0 mg/mL for mycelia and cultural filtrate were obtained, respectively. The enzyme kinetic study revealed that 80% methanol extracts inhibited intestinal α-glucosidase activity noncompetitively. The results of the study therefore indicate the potential of these extracts to manage postprandial hyperglycemia via inhibiting intestinal α-glucosidase activity.
