Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China.
J Sci Food Agric. 2010 Aug 30;90(11):1783-8. doi: 10.1002/jsfa.4012.
Bagging has been widely used to improve the commercial value of fruit. The purpose of this study was to evaluate the effects of different light transmittance paper bags on the quality and antioxidant capacity of loquat fruit. Two loquat cultivars, Baiyu and Ninghaibai (Eriobotrya japonica Lindl.), were used for materials. One-layered white paper bags (OWPB) with approximately 50% light transmittance and two-layered paper bags with a black inner layer and a grey outer layer (TGDPB) with approximately 0% light transmittance were used as treatments and unbagged fruits were used as the control (CK) in this experiment. Fruit quality was determined by physicochemical characteristics, the quantity of sugar, total phenolic, flavonoid, carotenoid and vitamin C. The antioxidant capacities of the methanol extracted from the pulp were tested using three different assays.
The results showed that bagging decreased the weight of fruit but promoted the appearance of loquat fruits. The total sugar content in the fruit bagged with OWPB was higher than in controls and in fruit bagged with TGDPB. The total phenolic and flavonoid contents were decreased by both bagging treatments, with the lowest occurring in the fruit bagged with TGDPB. Bagging also decreased the total antioxidant capacity of the fruit pulp, which was again lower in TGDPB-treated fruits than in those bagged using OWPB. Correlation analysis showed a linear relationship between total antioxidant capacity and the content of total phenolic and flavonoid.
The results showed that different light transmittance bags had different effects on fruit quality and antioxidant capacity. In particular, bags with low light transmittance (TGDPB) decreased the inner quality and total antioxidant capacity of loquat fruit. All results indicated that bagging with OWPB was more suitable for maintaining the quality of the loquat fruit than bagging with TGDPB.
套袋已被广泛应用于提高水果的商业价值。本研究旨在评估不同透光率纸袋对枇杷果实品质和抗氧化能力的影响。以白玉和宁海白（Eriobotrya japonica Lindl.）两个枇杷品种为材料，用透光率约为 50%的单层白纸袋（OWPB）和透光率约为 0%的双层纸袋（TGDPB，内黑外灰）进行处理，未套袋果实作为对照（CK）。用理化特性、糖含量、总酚、类黄酮、类胡萝卜素和维生素 C 来衡量果实品质。采用三种不同的测定方法来测定果肉甲醇提取物的抗氧化能力。
结果表明，套袋减少了果实的重量，但促进了枇杷果实的外观。OWPB 套袋果实的总糖含量高于 CK 和 TGDPB 套袋果实。总酚和类黄酮含量均因套袋处理而降低，其中 TGDPB 套袋果实含量最低。套袋还降低了果肉的总抗氧化能力，TGDPB 套袋果实的总抗氧化能力再次低于 OWPB 套袋果实。相关性分析表明，总抗氧化能力与总酚和类黄酮含量呈线性关系。
结果表明，不同透光率的袋子对果实品质和抗氧化能力有不同的影响。特别是透光率低的袋子（TGDPB）降低了枇杷果实的内在品质和总抗氧化能力。所有结果表明，OWPB 套袋比 TGDPB 套袋更适合保持枇杷果实的品质。
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