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ÔÚ²âÁ¿ÏËÎ¬ËØÃ¸µÄ¹ý³ÌÖУ¬ÎÄÏ×½éÉÜ¡±One unit of activity is defined as the amount of the enzyme required to release 1 umol reducing groups per min per g of original fresh weight of berry flesh.¡° µ«ÊÇÎÄÏײ¢Ã»ÓнéÉܾßÌ幫ʽ£¬ÇëÎÊÕâ¸ö¼ÆË㹫ʽÊÇʲô£¬ÒÔ¼°¡±D-glucose as the standard¡°ÊDz»ÊÇÐèÒª±ê×¼ÇúÏßµÄÒâ˼£¿Ï£Íû¸÷λ´óÉñÄܰïæ½â´ðÏ ÔÎÄÈçÏ£º ¡°Cellulase activity was determined by measuring the reducing groups released from carboxymethyl cellulose (Chin, Ali, & Lazan, 1999). The formation of reducing groups was estimated against D-glucose as the standard. The reaction mixture contained 0.1 ml of crude enzyme, 0.4 ml of 1% (w/v) carboxymethyl cellulose, and 0.5 ml 0.1 M sodium acetate buffer, pH 5.0. Incubation was carried out at 37 C for 1 h followed by addition of DNS. In control tubes the substrate was added after the heat treatment. After heating in a boiling water bath for 5 min, the absorbance was measured at 540 nm. One unit of activity is defined as the amount of the enzyme required to release 1 umol reducing groups per min per g of original fresh weight of berry flesh.¡° |
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