Postharvest l-cysteine application delayed pericarp browning, suppressed lipid peroxidation and maintained antioxidative activities of litchi fruit

Abstract Efficacy of l -cysteine as an anti-browning agent was investigated on ‘Gola’ litchi fruit. Fruit were treated with its different concentrations (0.0, 0.25, 0.50, 0.75 and 1.0%) and stored at 5 ± 1 °C with 90 ± 5% relative humidity (RH) for 28 d. Among the used concentrations, 0.25% treatment was most effective. l -cysteine (0.25%) treated-fruit showed significantly reduced weight loss, disease incidence, disease severity, browning index, membrane leakage and malondialdehyde (MDA) contents. Application of l -cysteine (0.25%) to litchi fruit maintained acidic pericarp pH, exhibited higher total anthocyanins, 2,2-Diphenyl-1-picryl-hydrazyl (DPPH) radical-scavenging-activity and total phenolic contents (TPC) along with reduced activities of peroxidase (POD) and polyphenol oxidase (PPO) enzymes. l -cysteine (0.25%) treatment also maintained substantially higher soluble solid contents (SSC), titratable acidity (TA), ascorbic acid contents and activities of catalase (CAT) and superoxide dismutase (SOD) enzymes. In conclusion, pre-storage l -cysteine (0.25%) application to litchi fruit exhibited reduced pericarp browning index and maintained antioxidative system for 28 d.

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