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A platinum(II) complex Pt(phen)CCC 6 H 4 CHO has been demonstrated as a highly selective phosphorescent chemodosimeter for cysteine and homocysteine. Upon addition of homocysteine or cysteine to its acetonitrile–water solution, an evident luminescent color variation from green to orange was observed. This red-shift of phosphorescence emission could be attributed to formation of a thiazinane...
A simple colorimetric method for the determination of cysteine and homocysteine has been developed. The reaction of the azo dyes containing an aldehyde group with cysteine or homocysteine afforded very stable derivatives thiazolidines or thiazinanes under neutral pH conditions. The method is selective and sensitive for cysteine and homocysteine detection without the interference of other amino acids...
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