文档介绍：鲜切苹果贮存保鲜方法的探讨
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(南京农业大学工学院,浦口区点将台路40号,农机系,农业机械化及其自动化专业,10级XX班,学号XXXXXXXXX,邮编210031)
摘要: 苹果的贮存和保鲜方法多种多样。苹果属典型呼吸跃变型果品,采后具有明显的后熟过程,果实内的淀粉会逐渐转化成糖,酸度降低,果实退绿转黄,硬度降低,充分显现出本品种特有的色泽、风味和香气,达到本品种最佳食用品质。进于步继续贮藏,会因为果实内营养物质的大量消耗而变得质地绵失脆、少汁,进而衰败、变质、腐烂。可以利用通风库或一般贮藏所,采用塑料大帐封贮,在温度不超过15℃条件下进行贮存。入贮初期采用12%~16%较高浓度的二氧化碳、2%~4%较低浓度的氧做短时间处理,以后随温度的降低,逐渐调控至低氧、低二氧化碳气调贮藏,可以利用入贮初期的高二氧化碳抑制后熟退绿,起到直接入低温冷藏的效果。
通过调节苹果储藏环境气体组份的浓度,气调贮存可以降低氧气浓度并提高二氧化碳浓度,从而有效地控制苹果的呼吸作用,并抑制微生物的生长繁殖来达到保鲜储藏的一种方法。而生物技术则是利用遗传基因进行果蔬保鲜。分子生物学家发现,乙烯的产生可作为果蔬成熟的标志。臭氧能够降低果实腐烂率,保存较好的保鲜效果。我国科学家通过臭氧处理研究了荔枝、银杏、甜玉米等果蔬的保鲜,具有很好的保鲜效果,并且对果实的营养成分具有很好的保持作用,
关键词:苹果,贮藏,保鲜
Fresh-keeping and mechanism of persimmon leaf flavonoids onfresh-cut apple
Abstract:Fresh-keeping of persimmon leaf flavonoids (PLF) on fresh-cut apple was studied. The content ofVc and TSS,and the changes of browning degree of fresh -cut apple were studied during the storage. Themechanism of PLF on fresh-cut apple was studied from the inhibitory on tyrosinase activities and its oxidationresistance. The results showed that PLF showed good fresh -keeping when concentration of sample mg/mL,soak time 5 min. PLF had obvious inhibitory activity on tyrosinase, had activity of scavenging DPPH·, O2·and ·OH. Conclusion: PLF showed good fresh -keeping. The mechanism was related to its inhibitory ontyrosinase activities and its oxidation resistance. This is probably the PLF with preserv