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淀粉磷酸化酶可催化淀粉中的α-1,4-糖苷键与无机磷反应产生葡萄糖-1-磷酸，葡萄糖-1-磷酸在磷酸葡萄糖变位酶的作用下产生葡萄糖-6-磷酸，并在6-磷酸葡萄糖脱氢酶催化下还原NADP + 产生NADPH，NADPH在340 nm处具有特征吸收峰，通过吸光值变化即可表征淀粉磷酸化酶的活性。
Starch phosphorylase catalyzes the reaction of α-1,4-glycosidic bonds in starch with inorganic phosphate (Pi) to generate glucose-1-phosphate (G-1-P). The generated G-1-P is converted to glucose-6-phosphate (G-6-P) by phosphoglucomutase (PGM), and G-6-P then reduces NADP⁺ to NADPH in the presence of glucose-6-phosphate dehydrogenase (G6PDH). NADPH exhibits a characteristic absorbance peak at 340 nm. The activity of starch phosphorylase can be determined by monitoring the change in absorbance at this wavelength.
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