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ÎÒÊÇѧ»¯Ñ§µÄ£¬¶ÔÉúÎï²»ÊǺÜÁ˽⣬×î½üÔÚ²éÔÄNADH»¹ÔÐ͸¨Ã¸IµÄ±£´æBufferµÄ×ÊÁÏ£¬¿´µ½ÒÔǰµÄÌû×ÓÓÐ˵ÓÃtris buffer PH~8µÄ£¬Ìû×ÓÀïÒ²ÌùÓÐÎÄÏ×£¬ µ«ÊÇÖ»ÊÇûÓÐÎÄÏ׳ö´¦£¬ÏëÇë½Ì¸÷λÉúÎï¸ßÊÖ£¬ÄÜ·ñ¸æÖªÕâÆªÎÄÏ׵ijö´¦£¬»òÕß·¢¸øÎÒÕâÆªÎÄÏ×£¿ ÁíÍâֻ˵ÁË¿ÉÓÃtris buffer PH~8£¬ÄÇôbufferŨ¶ÈÊǶàÉÙÄØ£¿ÅäÖÆÃ¸µÄŨ¶ÈÓÖÊǶàÉÙÄØ£¬»¹ÊÇøµÄŨ¶ÈÊǸù¾ÝÒª²â¶¨µÄ¶«Î÷À´¶¨£¬±ÈÈçÎÒÃÇÒª²â¶¨ALT£¬ASTµÄ£¬ ÄÇôNADHµÄŨ¶ÈÓ¦¸ÃÊǶàÉÙÄØ£¿Ï£Íû¸÷λ¶à¶àÖ¸µã£¬Íò·Ö¸Ðл£¡ ÎÄÏ×ÄÚÈÝÈçÏ£º Colowick, Kaplan, and Ciotti (4) observed that the rate of hydrolysis of the nicotinamide-ribose linkage of NAD at 100¡± increases with increasing pH above pH 6.0. The rates of hy- drolysis obtained in various buffers at pH 7.5 were found to de- pend on the type of buffer used. Tris and acetate buffers did not increase the rate of hydrolysis above that observed with un- buffered NAD at this pH, whereas phosphate and citrate buffers enhanced it 3- to 4-fold. It was noted (1) that Tris could almost completely abolish this stimulatory effect of phosphate and citrate buffers |
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