SIPSKDALLK
β-galactosidase activated by sodium ions can catalyze o-nitrophenol to produce glycoside and o-nitrophenol. The increase of absorbance is determined at 405 nm, and the content of sodium ion is calculated indirectly.
The formation of nitrophenol from the substrate nitropyranoside is catalyzed by sodium-activated β-galactosidase. The increase rate of absorbance value of nitrophenol at 405 nm per unit time was proportional to the sodium concentration.
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