紫薯复合饮料的质量指标、营养成分及抗氧化性分析  

Quality Indicators,Nutritional Composition and Antioxidant Activities of Blended Purple Sweet Potato Beverage

作　　者：潘丽军[1] 孙潇雅[1] 姜绍通[1] 

机构地区：[1]合肥工业大学农产品加工研究院、安徽省农产品精深加工重点实验室,安徽合肥230009

出　　处：《食品科学》2013年第20期165-169,共5页Food Science

基　　金：国家科技成果转化引导基金项目(2009GB2C300163);“十二五”国家科技支撑计划项目(2011BAD02B04)

摘　　要：研究实验室自制紫薯复合饮料的质量指标、组分含量以及抗氧化性。采用中温α-淀粉酶、葡萄糖糖化酶水解原料紫薯,与苹果汁进行复配制得紫薯复合饮料。结果表明:紫薯复合饮料可溶性固形物含量不小于8%、总酸含量0.5%左右、花青素含量6.18mg/100mL、透光率43.9%;微生物指标符合国家标准要求;色泽、味道、口感俱佳。氨基酸自动分析仪检测表明,自制紫薯复合饮料中含有12种游离氨基酸,总量约为33.68mg/100mL,其中人体必需氨基酸5种,含量9.15mg/100mL;采用高效液相色谱系统分析紫薯复合饮料糖分组成及含量,测得其含葡萄糖38.94mg/mL、果糖7.59mg/mL、蔗糖0.84mg/mL。自制紫薯复合饮料的·OH清除率为44.79%、DPPH自由基清除率为94.49%、O2-·清除率为83.02%,与市购紫薯饮料、100%苹果汁以及桑果汁饮料相比,抗氧化效果显著。The aim of this study was to investigate the quality indicators, component contents and their antioxidant activities of a blended purple sweet potato-apple beverage which was prepared in our laboratory by hydrolyzing purple sweet potato in the presence of α-amylase and glucoamylase and subsequently mixing with apple juice. The soluble solid content and total acid content were no less than 8% and approximately 0.5%, respectively. The anthocyanin content and light transmission were 6.18 mg/100 mL and 43.9%. All microbiological indicators tested met the GB （the Chinese national standard） requirements. The beverage had nice color, good taste and mouth feeling. Twelve free amino acids including five essential amino acids （EAA） were detected with an automatic amino acid analyzer. The contents of total amino acids （TAA） and EAA were 33.68 mg/100 mL and 9.15 mg/100 mL, respectively. Sugar composition and contents were analyzed by high-performance liquid chromatography. The beverage contained 38.94 mg/mL glucose, 7.59 mg/mL fructose and 0.84 mg/mL sucrose. The hydroxyl radical scavenging activity of the beverage was 44.79%. The DPPH radical and superoxide anion scavenging activities were 94.49% and 83.02%, respectively. Therefore, this blended beverage has significant antioxidant activity as shown compared with commercial counterparts. Key words：blend purple sweet potato-apple beverage;quality indicators;free amino acid composition;sugar composition;antioxidant activity

关 键 词：紫薯复合饮料 质量指标 游离氨基酸成分 糖类成分 抗氧化性 

分 类 号：TS275.5[轻工技术与工程—农产品加工及贮藏工程]