Kinetics and Mechanism of the Reaction of Cysteine and Hydrogen Peroxide in Aqueous Solution

Ultrasensitive colorimetric detection of Cu2+ ion based on catalytic oxidation of l-cysteine

“…where CSH was represented for cysteine, CSSC for cystine and CSOH for cysteine sulfenic acid (Luo et al, 2005). As seen, the presence of H 2 O 2 could also influence this Cu 2 þ -catalyzed reaction.…”

“…The Cu 2 þ -catalyzed proceeding reaction could be presumed as the following steps (Lee and Notari, 1987;Ehrenberg et al, 1989;Pecci et al, 1997, Luo et al, 2005: CSOH þCS À -CSSC þOH À…”

“…However, since amino group of amino acids could also react with CDNB when pH exceeded 6.8, higher concentration L-cystine generated from the oxidation of Lcysteine could interfere with the detection of Cu 2 þ ion. Moreover, the Fe 3 þ ion could also catalyze autoxidation and act as a direct oxidant in thiol oxidation under acidic conditions (Luo et al, 2005;Pirie, 1931), but the catalysis would be invalid at (near) neutral or alkaline conditions such as pH 7.3 (Elliott, 1930). As a result, pH 6.8 was chosen for the experiments.…”

Aggregation and pH Responsive Behavior of Thioester Surfactants and Formation of Disulfide Linkages in Aqueous Solutions

“…The time course of the alkaline hydrolysis for the thioester surfactant is investigated by HPLC analysis 23 . Figure 4 shows the chromatograms obtained using conductivity detector for C 12 4SAc systems.…”

Regulation of Ergothioneine Biosynthesis and Its Effect on Mycobacterium tuberculosis Growth and Infectivity

“…Using the SAM510 assay, the methylation activity of EgtD was assessed in the presence of each of the proteinogenic amino acids with the exception of cysteine due to its interference with the assay (38). The consumption of AdoMet in the reaction was continuously monitored at 1-min intervals over a 30-min time period.…”