干燥方式对睡莲花茶多酚及其抗氧化性的影响  

Effects of Drying Methods on Polyphenol and Antioxidant Activities of Waterlily Tea

作　　者：唐毓玮 龙凌云[1] 毛立彦[1] 黄秋伟[1] 温立香[1] 李佳慧 池昭锦[1] TANG Yu-wei;LONG Ling-yun;MAO Li-yan;HUANG Qiu-wei;WEN Li-xiang;LI Jia-hui;CHI Zhao-jin(Guangxi Subtropical Crops Research Institute,Nanning 530001,Guangxi,China)

机构地区：[1]广西壮族自治区亚热带作物研究所,广西南宁530001

出　　处：《食品研究与开发》2020年第11期59-65,共7页Food Research and Development

基　　金：广西重点研发计划(桂科AB18221054);广西壮族自治区亚热带作物研究所基本科研业务专项(桂热研201906)。

摘　　要：探讨不同干燥方式对睡莲花茶总酚、黄酮含量及抗氧化活性的影响,为睡莲花茶的加工与应用提供参考依据。以睡莲花朵为试验材料,设置不同温度的热风干燥、不同功率的微波干燥以及真空冷冻干燥处理,采用Folin-Ciocalteus法、NaNO2-Al(NO3)3-NaOH法检测各样品的总酚、黄酮含量,采用清除自由基法(DPPH·、ABTS+·)与铁离子还原法(ferric reducing antioxidant power,FRAP)评价其抗氧化活性,分析样品总酚、黄酮含量与抗氧化能力的关系。结果表明:不同干燥方法处理睡莲花,干燥速度为微波干燥>热风干燥>真空冷冻干燥。400 W微波干燥的样品总酚含量、DPPH·与ABTS+·抗氧化能力最高,分别为187.72 mg GAE/g DW、386.92 mg BE/g DW和162.37 mg BE/g DW,70℃热风干燥的样品黄酮含量最高,为65.58 mg RE/g DW,不同干燥处理的样品抗氧化活性与总酚含量显著相关(P<0.05),与其黄酮含量无显著相关(P>0.05)。与热风干燥、真空冷冻干燥相比,400 W微波干燥效率高,能较好的保留睡莲花茶中酚类物质,使其具备较强的抗氧化活性。This study was aimed to investigate the effects of different drying methods,included hot-air drying,microwave drying,and vacuum-freeze drying,on the content of total phenols,flavonoids and antioxidant activities of waterlily tea,which would provided reference basis for the processing and application of waterlily tea.The content of total phenols,flavonoids were determined by Folin-Ciocalteus,NaNO2-Al(NO3)3-NaOH methods respectively.The antioxidant activities were evaluated by DPPH free radical scavenging activity,ABTS+free radical scavenging activity and ferric reducing antioxidant power(FRAP).The relationship between the content of total phenols,flavonoids and antioxidant activity were analyzed by correlation analysis.The results showed that drying rate was influenced by drying methods which followed the order:microwave drying>hot-air drying>vacuum-freeze drying.Compared to the other drying,microwave(400 W)dried waterlily tea had the highest total phenol content(187.72 mg GAE/g DW),DPPH·antioxidant capacity(386.92 mg BE/g DW)and ABTS+·antioxidant capacity(162.37 mg BE/g DW).Meanwhile,hot-air(70℃)dried waterlily had the highest flavonoids content(65.58 mg RE/g DW).The antioxidant activity of samples with different drying treatments was significantly correlated with the total phenol content(P<0.05),but not with the flavonoids content(P>0.05).Compared with hot-air drying or vacuum-freeze drying,microwave(400 W)drying had higher efficiency,and could better retain phenolic substances in samples,so that it had stronger antioxidant activity.

关 键 词：睡莲 干燥方法 总酚 黄酮 抗氧化活性 

分 类 号：TS272.53[农业科学—茶叶生产加工]