3种减菌处理对采后百香果果实常温贮藏品质的影响

Effects of 3 kinds of subtracted bacteria treatment on normal temperature storage quality of the harvested Passiflora edulis Sims

中文关键词:  减菌处理  百香果  贮藏  品质

英文关键词:subtracted bacteria treatment  Passiflora edulis Sims  storage  quality

中文摘要:

      目的 研究3种减菌处理对采后百香果果实常温贮藏品质的影响。方法 以贵州省平塘县的紫皮百香果为试材, 分别用2%次氯酸钠、3%二氧化氯和3%过氧化氢溶液进行减菌处理, 分析其对百香果果实常温贮藏期间理化特性、食用品质以及细胞壁代谢的影响。结果 3种减菌处理抑制了百香果果实的呼吸作用和乙烯释放速率, 延缓果实失重率和凹陷率上升, 影响脂氧合酶(lipoxygenase, LOX)活性, 从而影响百香果果实的风味和出汁及渗出率; 3%二氧化氯和2%次氯酸钠通过降低百香果果实的多聚半乳糖醛酸酶(polygalacturonase, PG)和β-半乳糖苷酶(β-galactosidase, β-Gal)活性或使高峰推迟, 以维持细胞壁正常的结构和功能, 增强其抗病性而控制腐烂; 3%过氧化氢可加速有机酸流失, 促使百香果果实的PG和β-Gal活性增大或使高峰提前, 导致硬度下降和腐烂; 3%二氧化氯和2%次氯酸钠使总酚高峰提前或增加含量, 使木质素含量减小且高峰提前以增强其抗氧化和抗病能力而控制腐烂。二者均使苯丙氨酸解氨酶(phenylalamine ammonia lyase, PAL)和过氧化物酶(peroxidase, POD)活性降低或使其高峰推迟以缓解木质化进程而延缓衰老; 3%过氧化氢促使PAL和POD活性高峰提前或增加, 使木质素化进程过快而导致百香果果实有机酸流失、出汁率降低和腐败加速。结论 3种减菌处理可不同程度维持百香果果实采后常温贮藏的品质, 可作为百香果果实的减菌保鲜方法。

英文摘要:

      Objective To study the effects of 3 kinds of subtracted bacteria treatment on the normal-temperature storage quality of the harvested Passiflora edulis Sims. Methods Purple skin Passiflora edulis Sims in Pingtang County, Guizhou Province (experimental material) were treated with the 2% sodium hypochlorite, 3% chlorine dioxide and 3% hydrogen peroxide solution and the effects on physical and chemical characteristics, food quality and cell wall metabolism during normal temperature storage were analyzed. Results The experimental results showed that 3 kinds of subtraction treatments inhibited the respiration and ethylene release rate of Passiflora edulis Sims, delayed the increase of weight loss and shrinkage rate, and affected the activity of lipoxygenase (LOX) thus affected the flavor and the rate of juice and exudate Passiflora edulis Sims. The 3% chlorine dioxide and 2% sodium hypochlorite controled decay by reducing the activity or delaying the peak of polygalacturonase (PG) and β-galactosidase (β-Gal) of Passiflora edulis Sims, so as to maintain the normal structure and function of the cell wall and enhance its disease resistance; the 3% hydrogen peroxide could accelerate the loss of organic acid, promoted the PG and β-Gal activities of the Passiflora edulis Sims or advanced the peak, leading to decreased hardness and decay; the 3% chlorine dioxide and 2% sodium hypochlorite advanced or increased the peak of total phenols, reduced the lignin content and advanced the peak to enhanced their oxidation and diseased resistance and controled decay. Both reduced the activity of phenylalanine ammonia lyase (PAL) and peroxidase (POD) or delayed their peak to alleviate the lignification process and delayed aging. The 3% hydrogen peroxide promoted the advance or increased peaks of PAL and POD activity, which made the lignitination process too fast and leaded to the loss of organic acid, reduced juice rate and accelerated spoilage of Passiflora edulis Sims. Conclusion The 3 kinds of subtracted bacteria treatment maintain the storage quality of Passiflora edulis Sims at normal temperature. It can be used as a method of subtracted bacteria on Passiflora edulis Sims.