地涌金莲花加工过程中防褐变技术研究

摘要

[目的]本研究旨在探索抑制地涌金莲花在加工过程中褐变的方法.[方法]首次采用柠檬酸、D-异抗坏血酸钠、CaCl2、EDTA-2Na4种护色剂对地涌金莲进行护色处理,研究护色剂质量浓度和护色时间对地涌金莲花的色差值、褐变度、多酚氧化酶(PPO)和过氧化物酶(POD)活力的变化.[结果]4种护色剂的护色效果的变化趋势为柠檬酸＞D-异抗坏血酸钠＞CaCl2＞EDTA-2Na,柠檬酸和CaC12的最适护色质量浓度为0.3％,D-异抗坏血酸钠为0.35％;4种护色剂的最适护色时间为2h;单一柠檬酸的护色效果优于柠檬酸-D-异抗坏血酸钠复合护色剂的护色效果;0.3％柠檬酸处理2h对PPO活力的抑制率高达96.67％,对POD活力的抑制率高达91.71％.[结论]0.3％柠檬酸处理2h可以作为一种有效抑制地涌金莲花加工过程中褐变的方法.%[Purpose] This research was performed to explore a method against the browning of Musella lasiocarpa flower during process.[Methods] M.lasiocarpa flower was treated with four color protectors (citric acid,D-sodium erythorbate,calcium chloride and EDTA-2Na) for the firstly time.Chromatic aberration,browning degree,and activity of polyphenol oxidase (PPO) and peroxidase (POD) of M.lasiocarpa flower were measured to investigate the effect of color protectors concentration and treating time.[Results] The color protection effect of four reagents was:citric acid ＞ D-sodium erythorbate ＞ calcium chloride ＞ EDTA-2Na.The optimal concentration of citric acid and CaCl2 were both at 0.3％,and D-sodium erythorbate was at 0.35％.The optimum soaking time for four color protectors was 2 h.Citric acid exhibited better color fix effect than its mixture with D-sodium erythorbate.Processing with 0.3％ citric acid for 2 h gave 96.67％ inhibition on PPO activity,and 91.71％ inhibition on POD activity.[Conclusion] Pretreatment with 0.3 ％ citric acid for 2 h could be an effective method to prevent the brown of M.lasiocarpa flower during processing.