| Because of the seasonal, regional features of agricultural productions, and the inconsistencies of producer and consumer, it is necessary to maintain post-harvest fresh state for sometime. Fresh agricultural production after harvest is still a living organism, with a variety of strong physiological activities, consumption of nutrients, releasing breathing heat, leading to the decline of fresh agricultural products, while the surface microbial growth and reproduction, is exacerbated by the deterioration of corruption agricultural products, causing huge losses. The storage and transport of fresh agricultural products have been production problems. In this paper, agricultural productions with regional characteristics and difficulty under normal conditions of storage, such as Chinese Bayberry, Honey peach, Tricholoma matsutake were researched. According to the physiological characteristics of different agricultural productions, the parameters of compound hypobaric storage were screened and changes of different storage conditions on its physiological and biochemical and storage were, at the same time, preservation and hypobaric mechanism was discussed. The main research are as follows:1. Compared with the atmosphere storage under 3±1℃, various effects of 12h pre-storage hypobaric treatments combined 1-MCP(1-MCP) and plant essential oils and 20d hypobaric storage on Chinese Bayberry were studied under 1.5kPa. The results suggest that respiration rate and basal activity of enzymes related to defense were reduced by 1.5kPa,12h pretreatment. The pretreatment combined with 1-MCP can inhibit further suppress respiration rate and remain relevant enzyme (SOD, POD, PAL) activity, but the total number of viable cells can not be effectively reduced.1.5kPa,12h pretreatment combined with plant oil processing can be suppressed only by corruption inhibit microbial growth and reproduction, thereby increasing the storage time of Chinese Bayberry. Decay rate of 1.5kPa (3±1℃),20d hypobaric storage was significantly (P <0.05) reduced, with reducing free radical metabolism related enzymes such as SOD, POD, on the other hand by inducing antagonistic improve pathogen series of related enzymes (PAL) activity, while a lesser extent on PPO activity.2. Compared with the atmosphere storage under 3±1℃, various effects of 6h,12h and 24h pre-storage hypobaric treatments on honey peach were studied under 1.5kPa. The results suggest that 12h pre-storage hypobaric treatments has more than 5d shelf life and the most significant effect (P<0.05), the lowest weight loss and relative conductivity. The change of respiration, VC and intractable acidity was inhibited. pre-storage can be an economical preservation suitable for Promotion and application.According to the research on the preservation effect and its mechanism of Honey peach of hypobaric treatments, cold treatment at atmospheric pressure (3±1℃) as the control,20d,1.5kPa hypobaric treatment and 12h pre-storage hypobaric treatment, and 12h pre-storage hypobaric treatment combined with 1-methyl propylene (1-MCP) were studied. The results showed that:the treatment under the 3±1℃,1.5kPa hypobaric for 20d inhibited the rate of water loss and the change of relative conductivity,and quality index is the best, followed by 1.5kPa pretreatment of 12h with 1-MCP, while better than the vacuum pretreatment 12h group, they were all significantly better than the atmosphere cold storage. The Change of hypobaric treatment can not only suppress the peach sensory quality, at the same time through the inhibition of respiration, enhance the activities of protective enzymes, to delay the aging of Honey peach. The pretreatment of 12h with 1-MCP through the inhibition of respiration during refrigerated storage, reduce the delay of metabolic enzyme activity of free radicals to increase shelf life of honey peach.3. Compared with the atmosphere storage, the quality Changes were researched to explore the influence of 36h,48h,60h pre-storage hypobaric treatments in 1.5kPa (3± 1℃) on Tricholoma matsutake, with GC-MS. The results show that:under the 3±1℃ temperature, over 5d storage, water loss rate and the relative conductivity rises and changes in the type and content of the main volatile components were inhibited by hypobaric treatments of 1.5kPa, followed 1.5kPa pretreatment 48h, and both significantly better than the atmospheric pressure treatment.20d pre-storage hypobaric treatments could not only inhibit its sensory quality, at the same time through the inhibition of respiration, enhance the activities of protective enzymes activity, inhibition of aggressive, to delay the aging of Tricholoma matsutake. In addition 48h pretreatment with 1-MCP also has a good effect on Delaying Senescence of Tricholoma matsutake in the process, and can greatly improve the utilization rate of decompression library, has a good application prospect. |
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