Detect total content of NADP+ and NADPH: Glucose 6-phosphate (G6P) is oxidized to 6-phosphate gluconolactone (6-PG) by glucose-6-phosphate dehydrogenase (G6PDH), and NADP+ is reduced to NADPH during this reaction. NADPH, under the action of 1-mPMS, transfer electrons to WST-8 to produce the yellow product, which has a characteristic absorption peak at 450 nm. Therefore, the total content of NADP+ and NADPH can be quantified by measure the OD value at 450 nm. Detect NADPH: After treating sample, heat at 60℃ water bath for 30 min. the NADP+ of the sample is decomposed and only NADPH remains. NADPH reduces WST-8 to form Formazan, and the amount of NADPH is determined by measure the OD value at 450 nm. Detect NADP+ and NADP+/NADPH: The content of NADP+ and the ratio of NADP+/NADPH in the sample can be obtained according to the total content of NADP+ and NADPH obtained of the first two steps as well as the separate content of NADPH.
