摘要
本文旨在优化咖啡花多糖(ACP)的提取工艺,并评价其抗氧化活性。以咖啡花多糖得率为评价指标,通过对超声温度、超声时间、液料比、超声功率、浸泡时间和醇沉浓度6个工艺条件对咖啡花多糖得率影响的考察,选取了影响较大的超声温度、超声时间和超声功率3个工艺条件进行响应面分析。再通过DPPH、ABTS+自由基清除实验和FRAP法评估其抗氧化能力。结果表明,超声提取咖啡花多糖的最佳工艺条件为超声温度69.5℃,超声时间93 min,超声功率175 W,液料比10:1 mL/g,浸泡时间30 min,乙醇浓度80%,该条件下多糖得率为2.292%。结果表明,咖啡花多糖的DPPH自由基清除能力IC_(50)值为3.844 mg·mL^(−1);以Trolox当量来表示其ABTS+自由基清除能力为0.921 mmol Trolox/g ACP;以Fe^(2+)当量来表示其还原能力为0.0565 mmol Fe^(2+)/g ACP,咖啡花多糖具有一定的抗氧化活性。本研究将为咖啡副产品的综合利用与开发提供一定的参考理论依据。
To optimize the extraction technology and study antioxidant activity of polysaccharide from coffee flower(ACP),ultrasonic temperature,ultrasonic time,ratio of fluid-solid,ultrasonic power,sample immersion time and volume percentage of ethanol were investigated by using polysaccharide extraction yield as indicator.Then ultrasonic temperature,ultrasonic time and ultrasonic power were used as mainly influence factors,the extraction technology was optimized by response surface method.Antioxidant activity of ACP was investigated by DPPH·and ABTS^(+)·scavenging effects,and FRAP assays.The results demonstrated that the ultrasonic extraction optimum technological conditions were:Ultrasonic temperature 69.5℃,ultrasonic time 93 min,ultrasonic power 175 W,ratio of fluid-solid 10:1 mL/g,sample immersion time 30 min,and volume percentage of ethanol 80%.Under the the yield of polysaccharides was 2.292%.The results indicated that the value of IC_(50) based on DPPH·scavenging effect of ACP was 3.844 mg·mL^(−1),the ABTS^(+)·scavenging activity was 0.921 mmol Trolox/g ACP.The FRAP values of ACP by FRAP assay was 0.0565 mmol Fe^(2+)/g ACP,which showed that ACP had weak antioxidant activity.This study would provide a theoretical basis for the comprehensive utilization and development of coffee by-products.
作者
沈晓静
黄璐璐
聂凡秋
王青
杨俊滔
颜成慧
姜薇薇
SHEN Xiaojing;HUANG Lulu;NIE Fanqiu;WANG Qing;YANG Juntao;YAN Chenghui;JIANG Weiwei(College of Food Science and Technology,College of Science,Yunnan Agricultural University,Kunming 650201,China;Yunnan Key Laboratory of Pharmacology for Natural Products,Kunming Medical University,Kunming 650500,China;Ethnic Middle School of Longyang Bawan,Baoshan 678000,China)
出处
《食品工业科技》
CAS
北大核心
2022年第4期238-245,共8页
Science and Technology of Food Industry
基金
云南省天然药物药理重点实验室开放研究基金项目(70120030506)
云南省教育厅科学研究基金项目(2020J0241)
云南省农业基础研究联合专项面上项目(2018FG001-037)。
关键词
咖啡花
多糖
提取
抗氧化活性
coffee flowers
polysaccharide
extraction
antioxidant activity