漆蜡涂膜对鲜莲蓬采后褐变的影响

以鲜莲蓬为材料,在常温(25±1)℃条件下,以清水处理为对照,先进行漆蜡处理鲜莲蓬适宜质量浓度的筛选,并研究质量浓度为3 g/100 mL的漆蜡涂膜处理对鲜莲蓬采后褐变相关指标的影响。结果表明:3 g/100 mL的漆蜡涂膜处理对鲜莲蓬采后的褐变有明显的抑制作用;可有效抑制鲜莲蓬贮藏期间的呼吸强度,延缓莲子褐变度、丙二醛含量和O_2~-·生成速率的上升,维持莲子内部较低的过氧化氢H_2O_2含量,降低莲子贮藏期间的多酚氧化酶和苯丙氨酸解氨酶活性以及贮藏后期的过氧化物酶活性;同时,漆蜡涂膜处理维持了莲子较高的总酚含量、1,1-二苯基-2-三硝基苯肼自由基和O_2~-·清除能力及过氧化氢酶和超氧化物歧化酶活性。这些结果表明3 g/100 mL的漆蜡涂膜处理可延缓采后鲜莲蓬的褐变,从而维持其品质。

Effects of Lacquer Wax Coating on Postharvest Browning of Fresh Lotus Pods

In this experiment, fresh lotus pods were treated with water (as the control) and different concentrations of lacquer
wax, respectively, and then stored at (25 ± 1) ℃. The physiological and biochemical changes of lotus pods were investigated.
The results indicated that 3 g/100 mL lacquer wax coating treatment significantly inhibited the postharvest browning and
respiration rate of fresh lotus pods during storage, retarded the increase in browning degree, malondialdehyde (MDA)
content and superoxide anion (O2^?·) production rate, maintained low hydrogen peroxide (H₂O₂) content, and inhibited the
activities of phenylalanine ammonialyase (PAL) and polyphenol oxidase (PPO) during storage as well as peroxidase (POD)
activity at the late stage of storage. At the same time, total phenol content, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical
and superoxide anion radical scavenging abilities, as well as the activities of catalase (CAT) and superoxide dismutase
(SOD) were maintained at relatively high levels. In conclusion, lacquer wax coating at 3 g/100 mL inhibited the postharvest
browning and consequently maintained the quality of fresh lotus pods.