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投稿时间：2020-12-09
投稿时间：2020-12-09
中文摘要: 为探究热风干燥温度对桑叶干燥特性、活性成分含量及抗氧化能力的影响，以新鲜桑叶为研究对象将其在不同干燥温度（40、50、60、70℃）下进行热风干燥，探究干燥过程桑叶的干燥特性、色泽及总酚、总黄酮、1-脱氧野尻霉素含量变化，并对干燥后制品的单体酚类物质含量及抗氧化活性进行评价。研究结果表明：较低的干燥温度有助于保持桑叶的色泽；干燥后桑叶中总酚及总黄酮含量呈现下降趋势，而1-脱氧野尻霉素含量呈现上升趋势。此外，绿原酸、阿魏酸是桑叶中主要的酚类物质。60℃干燥温度下干制品的总酚及总黄酮含量最高（总酚含量为27.6 mg/g DW，总黄酮含量为18.9 mg/g DW），抗氧化能力最强（DPPH自由基清除能力为17.6 mg/g DW，铁离子还原能力为82.5 mg/g DW），而70℃干燥条件下桑叶干制品中1-脱氧野尻霉素含量最高，因此70℃干燥条件可作为生产辅助糖尿病病人控制血糖的桑茶的最佳条件。
Abstract:In order to determine the effect of hot air drying temperature on the drying characteristics，active component content，and antioxidant capacity of mulberry leaves，fresh mulberry leaves were dried by hot air at different drying temperatures（40，50，60，70 ℃）to explore the drying characteristics，color，total phenols，total flavonoids and 1-deoxynojirimycin content changes of mulberry leaves during the drying process.The results showed that a lower drying temperature helped to maintain the color of mulberry leaves.The content of total phenols and total flavonoids in mulberry leaves showed a decreasing trend after drying，while the content of 1-deoxynojirimycin showed an increasing trend.Moreover，chlorogenic acid and ferulic acid are the main phenolic substances in mulberry leaves.The contents of total phenols and total flavonoids in dried products at 60℃were 27.6 mg/g DW and 18.9 mg/g DW，respectively，and the DPPH free radical was 17.6 mg/g DW，while ferric ion reducing antioxidant power（FRAP）was 82.5 mg/g DW.However，the content of 1-deoxynithromycin in dry products is the highest under 70℃drying conditions.Therefore，it can be used to produce mulberry tea at 70℃ for use with diabetics to control blood sugar.
keywords: mulberry leaves hot air drying drying characteristies active components antioxidant activity
文章编号：202201008 中图分类号： 文献标志码：
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