Ranjbaran Ehsan, Gholami Mansour, Jensen Martin
Department of Horticultural Science, Faculty of Agriculture Bu-Ali Sina University Hamedan Iran.
Department of Food Science Aarhus University Aarhus N Denmark.
Food Sci Nutr. 2022 Jan 5;10(2):477-486. doi: 10.1002/fsn3.2697. eCollection 2022 Feb.
The influence of methyl jasmonate (MJ) preharvest treatment was investigated on some polyphenols and antioxidant systems in the "Thompson Seedless" table grape. The clusters were sprayed in the vineyard 2 days before harvest with 0, 1, 5, and 10 mM MJ. After picking, berries were stored for 6 days at 15°C, simulating marketing conditions. Total phenols and flavonoids were affected by MJ treatment, especially at 10 mM concentration, whereas total tannins were found to be unchanged. Antioxidant activity of the treated skin was noticeably higher compared with the control, together with PAL and POD activity. Although MJ had little effect on catechin and epicatechin, the levels of quercetin and rutin were noticeable. In addition, 5 and 10 mM MJ exerted a pronounced effect on transresveratrol content. These data showed that a single preharvest application close to the harvest time could be an effective treatment to promote the antioxidant properties of the grape.
研究了茉莉酸甲酯（MJ）采前处理对“汤普森无核”鲜食葡萄中某些多酚和抗氧化系统的影响。在收获前2天，对葡萄园中的葡萄串喷施0、1、5和10 mM的MJ。采摘后，将浆果在15°C下储存6天，模拟销售条件。总酚和类黄酮受MJ处理的影响，尤其是在10 mM浓度时，而总单宁含量未发生变化。与对照相比，经处理的果皮的抗氧化活性显著更高，苯丙氨酸解氨酶（PAL）和过氧化物酶（POD）活性也是如此。尽管MJ对儿茶素和表儿茶素影响较小，但槲皮素和芦丁的含量显著。此外，5和10 mM的MJ对反式白藜芦醇含量有显著影响。这些数据表明，在收获期临近时进行单次采前处理可能是促进葡萄抗氧化特性的有效处理方法。
