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A sensitive and selective colorimetric detection method for Cysteine (Cys) was established in this paper. The detection mechanism is based on the oxidation of Cys by H 2 O 2 , which prevents the catalysis of the 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS)–H 2 O 2 reaction by G-quadruplex halves. With the addition of Cys, the amount of the blue-green-colored...
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