核黄素复合羟丙基甲基纤维素涂膜处理对采后杨梅果实冷藏品质及抗氧化活性的影响

Effect of riboflavin in combination with hydroxypropyl methyl cellulose(HPMC) coating on quality and antioxidant activity in harvested Chinese bayberries during refrigerated storage

以"乌种"杨梅果实为试材,研究了核黄素复合羟丙基甲基纤维素(HPMC)涂膜处理对采后杨梅果实在1℃贮藏期间品质及抗氧化活性的影响。结果显示,单一1mmol/L核黄素或1%HPMC处理均可有效抑制杨梅果实在整个贮藏期间腐烂率上升和品质劣变。核黄素复合HPMC涂膜处理则较单一处理更为显著(p<0.05)的抑制了杨梅果实在贮藏期间腐烂的发生,并降低了果实呼吸速率和MDA积累,从而维持了果实品质。同时,复合处理可显著(p<0.05)诱导杨梅果实在贮藏期间花色苷合成相关酶,如PAL、C4H、4-CL和DFR活性的上升,从而使经复合处理的果实中矢车菊-3-葡萄糖苷、榭皮素-3-O-芸香苷、杨梅黄酮和总花色苷含量以及DPPH自由基清除率和总还原力均显著(p<0.05)高于单一处理水平。结果说明,核黄素复合羟丙基甲基纤维素涂膜处理在采后杨梅果实保鲜领域具有良好的应用前景。

In the present study,the effects of riboflavin in combination with HPMC coating on quality and antioxidant activity in harvested Chinese bayberries during the storage at 1℃ were investigated. The results exhibited that the treatment of 1mmol/L riboflavin or 1% HPMC coating alone could effectively inhibit the increase in decay incidence and quality deterioration in Chinese bayberries during the whole storage. The combination of riboflavin and HPMC coating more significantly inhibited decay occurrence and reduced respiration rate and MDA accumulation in Chinese bayberries during the storage compared with the either alone,which led to maintaining the fruit quality parameters. Meanwhile,the combined treatment could significantly induce the increase in the activities of anthocyanin synthesis related enzymes such as PAL,C4H, 4-CL and DFR in Chinese bayberries during the storage, resulting in higher contents of C3G,Q3R, MT and total anthocyanins as well as scavenging capacity against 1,1-diphenyl-2-picrylhydrazyl （DPPH） and reducing power than riboflavin or HPMC applied alone. These results indicated that riboflavin in combination with HPMC coating might obtain a promising application in preservation of harvested Chinese bayberry.