低次烟叶蛋白质—多酚复合物的成分及抗氧化性分析
2017-03-21许春平冉盼盼曾颖谭兰兰申
许春平++冉盼盼++曾颖++谭兰兰++申屠洪钎++马扩彦++戴亚
摘要:采用碱溶酸沉法从烤烟低次烟叶中提取蛋白质-多酚复合物,检测其中蛋白质含量为350 mg/g,多酚成分包括绿原酸、莨菪葶、芸香苷,其含量分别为2.1、0.5、2.9 mg/g。对蛋白质-多酚复合物进行抗氧化性检测。结果表明,在一定范围内,DPPH·自由基与OH·自由基的清除率随复合物浓度的增加而升高;对蛋白质-多酚复合物中蛋白质进行酶解,酶解产物的抗氧化性测试结果表明,随着酶解时间的延长,复合物对DPPH·自由基与OH·自由基的清除活性均呈下降趋势,说明蛋白质与多酚结合状态下才能保持蛋白质-多酚复合物的抗氧化性,而且其抗氧化性可能主要来源于复合物中的多酚。
关键词:低次烟叶;蛋白质-多酚复合物;酶解;抗氧化性
中图分类号:S572 文献标识码:A 文章编号:0439-8114(2017)03-0531-04
DOI:10.14088/j.cnki.issn0439-8114.2017.03.035
Analysis of Composition and Antioxidant Activity of Protein-polyphenol Complex from Discarded Tobacco Leaves
XU Chun-ping1,RAN Pan-pan1,ZENG Ying1,TAN Lan-lan2,SHENTU Hong-qian2,MA Kuo-yan3,DAI Ya3
(1.College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002,China;
2.Technical Center of China Tobacco Chuanyu Industrial Co. Ltd., Chengdu 610066,China;
3.Technical Center of China Tobacco Chongqing Industrial Co. Ltd., Chongqing 400060,China)
Abstract: The protein-polyphenol complex was extracted from discarded tobacco leaves by alkali-solution and acid-isolation method. The protein content was detected as 350 mg/g and polyphenol components including chlorogenic acid, scopoletin and rutin, and their contents were 2.1 mg/g, 0.5 mg/g, and 2.9 mg/g, respectively. The antioxidant tests of protein-polyphenol complex showed that in a certain range, the scavenging rate of DPPH· radical and OH· radical increased with the increase of the concentration. The scavenging activity of DPPH· radical and OH· radical was decreased with the time of enzymatic hydrolysis. The results indicated that the antioxidant activity of protein-polyphenol can maintain with the binding stage of protein and polyphenol, and the main source of antioxidant activity could be from polyphenols.
Key words: discarded tobacco; protein polyphenol complex; enzymatic hydrolysis; antioxidant activity
中國是烟草种植大国,也是卷烟生产大国,同时每年产生的低次烟叶也数量庞大,有效利用这些废料既可以保护环境,减轻环境负担,也能创造更高的经济价值。烟叶蛋白质是一种优质的蛋白质资源,作为食用蛋白质来说它比鸡蛋、乳酪和牛奶更适合人体吸收利用,具有较高的营养价值和药用价值[1]。Kung等[2]、Lowe[3]对烟叶FI蛋白质进行了提纯。赵谋明等[4]使用碱溶酸沉法工艺对烟叶蛋白质进行提取。研究表明,提取出的蛋白质是一种蛋白质多酚复合物[5],其中多酚成分对其生物活性有较大影响。林晓婕等[5]从烟叶中提取出色素蛋白质复合物,表明其中多酚物质对其抗紫外活性起主要作用。……
