振动对不同堆高哈密瓜果实理化品质影响差异性研究

Effects of Vibration on Physicochemical Quality of Hami Melon Fruits Stored at Different Stacking Heights

【目的】模拟运输振动,分析哈密瓜在持续振动过程中不同堆高果实生理及品质指标的变化及差异性,为哈密瓜冷链运输调控品质提供依据。【方法】以新疆哈密瓜早熟品种西周密25号为试材,在温度4～6℃、3个不同堆高、振动频率7 Hz的条件下,测定果实呼吸速率、果肉相对电导率等6个理化品质指标的变化规律,分析振动对不同堆高哈密瓜果实生理及品质产生的影响。【结果】振动对呼吸速率影响为:下层>上层>中层,对相对电导率影响为:中层>下层>上层,对水分含量影响为:下层>中层>上层,对可溶性固形物含量影响为:上层>中层>下层,对可滴定酸含量影响为:中层>上层>下层,对VC含量影响为:下层>上层>中层。【结论】在4～6℃,持续低频振动条件对下层堆高哈密瓜果实生理及品质影响最大,其次为中层和上层,在此环境下会加快哈密瓜果肉呼吸速率,增加果肉相对电导率,加速果肉水分含量、VC含量的减少。

【Objective】This project aims to simulate refrigerated transport vibration of Hami-melon and analyze the variation and difference of physiological and quality indexes of different stacking heights for Hami-melon fruits in the hope of providing basis for the quality control of cold chain transportation of the fruits.【Method】Xizhoumi 25,an early maturing variety of Hami melon in Xinjiang was used as the test material.Under the conditions of 4-6℃ and three different stacking heights and vibration frequency 7Hz,the changes of physiological indexes,such as fruit respiration rate and relative electrical conductivity of pulp were measured and effects of vibration on fruit physiology and quality of Hami melon stored at different height were analyzed.【Result】The effects of vibration on respiratory sorted by size:bottom>top>middle;The relative conductivity sorted by size:middle>bottom>top;The moisture content sorted by size:bottom>middle>top;The soluble solid content sorted by size:top>middle>bottom;The titratable acid content sorted by size:middle>top>bottom;The vitamin C content sorted by size:bottom>top>middle.【Conclusion】The results indicated that lower frequency vibration could quicken the respiratory rate of melon pulp,increase the relative conductivity and the moisture content and decrease vitamin C content of melon pulp between 4-6℃.The effect of continuous low-frequency vibration on physiology and quality of Hami-melon fruits in lower heap was the greatest followed by middle heap and upper heap.