| Loofah is a kind of gourd family,there is a large area of cultivation in the north and south of our country, is rich in nutrients and one of indispensable vegetables in summer fall on the table. Heat treatment technology is a kind of safe and effective chemical residue treatment, the related research can prolong the shelf life of fruits and vegetables, to ensure the quality of fruit and vegetable storage.This experiment in different temperature of hot air to different time of the loofah, then put them in 4℃ refrigerator, study during the whole storage, heat treatment of loofah storage quality, membrane lipid peroxidation, the influence of active oxygen metabolism and towel gourd organization structure. Get the following conclusions:l.The heat treatment can improve the towel gourd fruit storage quality and storage:35℃,20min towel gourd can effectively delay (inhibitory) rose loofah during storage of Postharvest respiratory intensity, throughout the storage period of typical respiration show jumping mode, at the last stage of storage, towel gourd called control group suction strength of 89.8%, is 45℃,10min 80.1%. Delayed increase in Luffa epidermal cell membrane permeability, delayed the decrease of Luffa pulp TSS, soluble sugar, soluble protein content, maintain higher chlorophyll content, total chlorophyll in at the end of storage for 1.096mg/g, while the control group was 0.856mg/g, fully inhibited chlorophyll into lutein process, prevent the occurrence of autolysis rate and fruit of Luffa pericarp browning, reduces the rate of weight loss and chilling injury index of sponge gourd, maintained a good hardness, less decay of Luffa cylindrica, maintained a good good fruit rate, in storage at the end of the control group of chilling injury index is 1.86 times of 35℃ heat treated towel gourd, is 1.38 times of 45℃ heat treated.2.The heat treatment of membrane lipid peroxidation can suppress the fruit of Luffa cylindrica ability:heat treatment can inhibit Luffa membrane lipid peroxidation, malondialdehyde (MDA) to reduce toxic substances content increased, the 12d content was the lowest when the 2.08μmol·g-1 FW, while reducing soluble substance exudation, maintain the stability and integrity of cell membrane structure, improve the cold resistance of fruit ripening and senescence, to a certain extent, can delay the towel gourd fruit.3. the heat treatment can improve the effect of active oxygen metabolism of Luffa cylindrica:heat treatment can effectively enhance the towel gourd fruit during storage of SOD, POD, PPO, CAT activity, total phenolic content keep high, improve their own clear H2O2 toxicity, and enhance the stability of cell membrane in low temperature and the scavenging capacity of 02-free radicals, ripening and senescence eventually slow Luffa, prolong storage time. The activity of POD in late 50.60% higher than at the beginning of the type of storage, the SOD activity in the early storage than the prototype is increased by 6.37%, the activity of CAT increased by 51.04%. As for the PAL activity, after heat treatment. PAL activity was inhibited, in 3-PAL activity in 9d began a downward trend, the maximum peak to valley changes, including 45℃Luffa fell the most, the activity of PAL decreased from 10092.6U/g-h 4494U/g-h, drop extent reached 55.47%, delayed the lignification of Luffa cylindrica and browning. By three compare the results of the experiments, the heat treatment of 35℃ 20min is suitable heat treatment conditions.4.By the observation of different storage period of sponge tissue sections found: after the Luffa suitable temperature processing integrity of the organization structure has been protected, while the temperature treatment is not suitable will accelerate the decay and browning process. During the whole storage period, compared with the other two groups treatment, treatment 2 (35℃,20min) Luffa maintained a good storage quality, enhance the integrity of the epidermis, the parenchyma cells inhibit cell-cell fusion of the contents of the internal level and loofah material stripping, ensure the storage quality. Therefore, the heat treatment temperature 35℃ is suitable. After heat treatment at 35℃ 20min towel gourd, keep good storage quality during the storage period, through the observation on the paraffin sections of Luffa organization we learned, heat treatment at 35℃ loofah epidermal rupture time than the other two treatment was delayed, while the edible part is formed by the fusion of the occurrence of parenchyma cells the cavity is lighter, in storage to the first 14d, cell gap is reduced, serious water loss, showed epidermal folds. In this experiment, through observation of Luffa storage period of paraffin section showed that:35℃ 20min processing conditions is suitable, and the heat treatment at 45℃ 10min accelerates the loofah tissue decay, reduce the storage period. |
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