Ultrasensitive determination of cysteine based on the photocurrent of nafion-functionalized CdS-MV quantum dots on an ITO electrode.

As a fundamental building block for functional and structural components of many proteins and enzymes, cysteine, a sulfur-containing nonessential amino acid, plays a critical role in many biological processes. [ 1 ] This critical residue helps to fold and maintain a stable structure of protein, contributes towards enzymatic reactions and detoxifi cation processes, and participates in numerous posttranslational modifi cations. [ 2 ]

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