Determination of Significance:
Soluble Starch Synthase (SSS, EC 2.4.1.21) usually present in the free matrix in the plastid matrix, which catalyzes the elongation of the starch chain, mainly responsible for the synthesis of amylopectin.
Measurement Principle:
SSS catalyzes the reaction of ADPG with starch primer (glucan), transfers glucose molecules to starch primers, and simultaneously produces ADP. Add pyruvate kinase, hexokinase and 6-phosphate glucose dehydrogenase to the reaction system. These enzymes in turn catalyze NADP+ reduction to NADPH, the amount of NADPH produced is proportional to the amount of ADP produced in the previous step reaction, and the SSS activity can be calculated by measuring the increase of NADPH at 340 nm.
Self Provided:
Ultraviolet Spectrophotometer, Water Bath, Desk Centrifuge, Transferpettor, 1 mL Quartz Cuvette, Mortar/Homogenizer, Ice and Distilled Water.
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