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Sulphydryl moiety of cysteine is critical for determining peptides' reducing capacity. Glutathione (GSH) oxidation with Fenton's regent, Fe(II)/H2O2, decreased the sulphydryl content from 2406 ± 36 to 787 ± 14 µM/g. Potato proteins hydrolysed with pepsin and pepsin-pancreatin (PPHppc), with different surface and molecular properties, dose-dependently protected GSH sulphydryl group when added prior...
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