研究了实际生产中的微滤膜过滤对啤酒的老化与抗老化水平的影响,结果表明:在密闭环境,粗滤与精滤之后啤酒中的老化物质-醛类含量下降了4.11%,TBA值下降了2.13%,啤酒老化程度降低,口感更新鲜。与硅藻土过滤相比,微滤膜过滤过程中不会引入过渡态金属离子。抗老化物质SO2主要影响.OH的迟滞时间,R2为0.896 1,呈正相关,而膜过滤过程中SO2含量升高,使膜过滤后啤酒的迟滞时间延长。多酚物质可以减缓.OH的生成速率,膜过滤过程截留了啤酒中的抗老化物质多酚,使啤酒的DPPH清除率下降了5.70%,这使得啤酒中自由基生成速率升高,在老化后期抗老化水平下降。

Effect of the micro-membrane on theoxidation and anti-oxidation level of beers during the practical production was studied.The result showed that the content of aging substance-aldehyde and the TBA value decreased by 4.11% and 2.13% after coarse and fine filtration in the closed environment respectively,which made a lower aging degree and a more fresh taste.Compared to diatomite filtration,the process of microfiltration will not introduce transition state metal ions.The anti-oxidation substance SO2 mainly influenced the lag time of ·OH with R2 of 0.8961.Content of SO2 after membrane filtration increased,which extended the lag time.At the same time,anti-oxidation substance polyphenols could slow down the ·OH generation rate.The polyphenols could be retained during the membrane filtration process with the DPPH clearance rate dropped by 5.70%.So,free radical generation rate of beer increased and the anti-oxidation level beer decreased.