Effects of Ultraviolet-C(UV-C)Radiation on Enzymatic Browning of Fresh-cut Lotus Root
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摘要: 以'粉红藕'为试材,研究了短波紫外线处理对鲜切莲藕4℃冷藏过程中褐变效果的影响。主要分析了不同照射剂量(1.0、3.0和5.0 kJ/m2)下鲜切莲藕色泽、失水率、硬度、没食子酸含量、儿茶酚含量、多酚氧化酶(PPO)和超氧化物歧化酶(SOD)活性等对生理生化指标的影响。结果表明,5.0 kJ/m2剂量UV-C处理的鲜切莲藕褐变指数在贮藏第12 d时低于30,显著低于对照和其他处理组(P<0.05),5.0 kJ/m2剂量UV-C处理可通过抑制褐变底物儿茶酚、没食子酸与PPO反应来延缓鲜切莲藕的酶促褐变,并通过延缓硬度的下降,提高鲜切莲藕的贮藏品质。综合保鲜效果得出,12 d的贮藏期内,5.0 kJ/m2剂量UV-C处理抑制鲜切莲藕的褐变效果最佳。Abstract: The effect of different doses of UV-C radiation(1.0,3.0 and 5.0 kJ/m2)on the browning quality of fresh-cut lotus root was studied by using ‘Fen Hong Ou’ as the experimental materials. The color,water loss rate,firmness,the content of phenols and the activity of enzymes(PPO,SOD)were studied at 4℃ storage time(0,3,6,9 and 12 days).The results showed that the enzymatic browning index of fresh-cut lotus root was less than 30 on the 12th day during cold storage after 5.0 kJ/m2 UV-C radiation,significantly lower than that of the control and other treatment groups(P<0.05). The UV-C radiation dose of 5.0 kJ/m2 could delay the enzymatic browning of fresh-cut lotus root by inhibiting the reaction of browning substrates catechol,gallic acid and PPO. The decrease of firmness could also be delayed by UV-C radiation,indicating that the quality of fresh-cut lotus root could be preserved better. The irradiation dose of 5.0 kJ/m2 performed the best in 12 days of storage.
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Keywords:
- ultraviolet-C(UV-C)radiation /
- fresh-cut lotus root /
- storage /
- enzymatic browning
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