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Malus halliana Koehne flowers have been used as a Chinese traditional medicine to treat metrorrhagia. In this study, the dynamic changes in its secondary metabolites and spectrum-effect relationship of inhibition on α-glucosidase during blooming were investigated. The changes in the contents of three flavonoids (phloretin-4'-O-glycosidase, afzeloside, and 3-hydroxyphloridzin) were determined by high performance liquid chromatography (HPLC) and changes in inhibitory effect on α-glucosidase weredoi:10.1515/chem-2018-0043 fatcat:ozoosno6nffczfbwhgzw7psrzu