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活力：≥200 U/g。 来源：由曲霉属等微生物发酵生产 活力定义：1 U corresponds to the amount of enzyme which changes the absorbance at 310 nm by 1.0 per minute at pH 4.7 and 30°C (tannic acid as substrate, final volume 3 ml)。 性状：白色粉末。 储存条件： 2～8℃
