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Thiolysis£º100 ul of the sample were mixed with 100 ul of methanol acidified by concentrated HCl (3.3% v/v), and 200 ll of toluene-a-thiol (5% v/v in methanol) were added. The reaction mixture was placed in a sealed Pyrex glass test tube, heated at 40 C for 30 min and finally cooled with running water.

cysteamine £ºThe lyophilizate (1 mg) was dissolved in MeOH (1 mL). An aliquot (200 ixL) was added to the thiolysis mixture (200 ixL), which consisted of cysteamine hydrochloride (50 mg) and 37% hydrochloric acid (20 ixL) dissolved in MeOH (930 ixL).The mixture (400 ixL) was kept at 60 ~for 15 min, when the reaction was then quenched with 0.1% (v/v) aqueous TFA (1.2 mL).

phloroglucinol£ºsample  were dissolved in 400 ll of freshly prepared MeOH containing 0.2 N HCl, 50 g/l phloroglucinol, and 10 g/l ascorbic acid and heated for 60 min at 50 C. Then, an equivalent volume of aqueous 200 mM sodium acetate was added to stop the reaction¡£
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