UV-C处理对鲜切‘皇冠’梨褐变的影响

doi:10.3864/j.issn.0578-1752.2020.24.011

Abstract

Abstract:

【Objective】In order to provide an experimental basis for the preservation of fresh-cut pears and enlarging the application of UV-C, the effects of pre-processing and post-processing UV-C treatment on the browning inhibition of fresh-cut pears and its possible physiology mechanism were studied.【Method】Fresh-cut pears were separately treated by pre-processing and post-processing UV-C (254 nm) for 5 min, and then the physiological parameters were evaluated, including browning degree (BI), the activities of polyphenol oxidase (PPO), phenylalnine ammonialyase (PAL), total phenolic content (TPC), H₂O₂ and MDA content, the activities of antioxidant enzymes (superoxide dismutase, SOD, catalase CAT, ascorbate peroxidase APX, glutathione reductase GR) and non-enzymatic antioxidant capacities (DPPH, ABTS radical scavenging activities and reducing power).【Result】The results showed that both pre-processing and post-processing UV-C treatment could effectively delay the browning of fresh-cut pears. Post-processing UV-C treatment exhibited better browning controlling effect than that of pre-processing UV-C treatment. Both two kinds of UV-C treatments could improve the PPO activity, reduce the PAL activity and TPC, as well as increase the enzymatic and non-enzymatic antioxidant activities of fresh-cut pears and decrease the accumulation of H₂O₂and MDA. Statistical analysis indicated that BI were significantly negatively correlated with CAT, APX and GR activities, and non-enzymatic capacities (P<0.01). While there was a positive correlation between BI and H₂O₂, MDA content (P<0.01).【Conclusion】These findings suggested that UV-C treatment delayed browning of fresh-cut pears during storage mainly through improving the antioxidant defense system. Post-processing UV-C treated fresh-cut pears possessed higher antioxidant activity than that of pre-processing treated samples, therefore, which exhibited better browning controlling effect.

Key words: fresh-cut pears, browning, UV-C, physiology mechanism

CHEN Chen,JIANG AiLi,LIU ChengHui,ZHAO QiQi,ZHANG YanHui,HU WenZhong. Effect of UV-C on the Browning of Fresh-Cut Huangguan Pear[J].Scientia Agricultura Sinica, 2020, 53(24): 5081-5090.

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References 37

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