活力：≥200 units/g solid

活力定义：One unit will liberate 1.0 mg of N-acetyl-D-glucosamine from chitin per hour at pH 6.0 at 25 °C in a 2 hour assay.

One new 1 hour unit = approx. 50 old 48 hour units.

储存条件： -20℃

外观： 白色冻干粉

溶解性： H2O:soluble 0.9-1.1mg/ml

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