UV-C处理对‘黄金’百香果贮藏品质和采后生理的影响

Effects of Ultraviolet-C Treatment on the Storage Quality and Postharvest Physiology of ‘Golden’ Passion Fruit

摘要:

该研究以‘黄金’百香果为材料，进行不同剂量的UV-C照射处理（0、2.02、4.04和6.06 kJ/m2，0 kJ/m2为对照），20 ℃环境中贮藏18 d。贮藏第9天时，与对照相比，UV-C处理能显著抑制L*值的下降和b*值的上升（P<0.05），显著抑制可滴定酸（TA）和类黄酮含量的下降（P<0.05），保持a*值为负值，降低果实的腐烂指数和皱缩指数，2.02和4.04 kJ/m2剂量的UV-C处理果实后，维生素C（Vc）含量均显著高于对照（P<0.05），分别比对照高2.66和2.11 mg/100 g，2.02和6.06 kJ/m2处理果实的呼吸强度显著低于对照（P<0.05），分别比对照低7.84和16.96 mg CO2/g FW h，但都可溶性固形物（TSS）和总酚含量以及硬度值没有显著的影响（P<0.05），6.06 kJ/m2处理增加了细胞膜的透性，使总酚含量降低。综合来看，2.02 kJ/m2处理的效果较好，好于对照和其他剂量UV-C处理的效果，可作为有效处理为UV-C在百香果采后上的应用提供一定的理论指导。

Abstract:

In this study, ‘golden’ passion fruit was used as the experiment material, and different doses of UV-C treatment (0, 2.02, 4.04, and 6.06 kJ/m2; the sample subjected to 0 kJ/m2 UV-C as the control) were used to treat the fruits before they were stored at 20 ℃ for 18 d. Compared with the control, on the 9th day of storage, the UV-C treatment led to significant suppression on the decrease of L* value, the increase of b* value (P<0.05), and the decrease of titratable acid (TA) and flavonoid contents (P<0.05), while maintaining a* values as negative values and reducing the decay index and shrinkage index; The vitamin C contents of the fruits treated by UV-C at 2.02 or 4.04 kJ/m2 were 2.66 and 2.11 mg/100 g, respectively, which were higher than that of the control; The respiration rates of the fruits treated by UV-C at 2.02 or 6.06 kJ/m2 were 7.84 and 16.96 mg CO2/g FW h, respectively, which were lower than that of the control, although there was no significant effect on the content of total soluble solids, total phenolic content and firmness value (P<0.05); The UV-C treatment at 6.06 kJ/m2 increased cell membrane permeability and decreased total phenolic content. In general, the effect of the UV-C treatment at 2.02 kJ/m2 was better than those of the control and other UV-C treatments, thus can be used as an effective treatment to provide some theoretical guidance for the application of UV-C on postharvest passion fruit.