热风干燥温度对冰菜干燥动力学、多酚含量及抗氧化活性的影响
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浙江省重点研发计划项目(2018C02048)


Effects of Hot Air Drying Temperature on Drying Kinetics, Polyphenol Content and Antioxidant Activity of Ice Plant
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    摘要:

    以冷冻干燥为对照,分析不同热风干燥温度(40,60,80,100,120 ℃)对冰菜干燥动力学、色度、水分活度、多酚含量以及抗氧化能力(DPPH、FRAP)的影响。结果表明:在热风干燥条件下,干燥温度越高,干燥时间越短。冰菜热风干燥的最优模型为SLogistic1模型,各温度下的决定系数R2均在0.970以上。随着热风干燥温度的升高,冰菜中的总酚、总黄酮及抗氧化活性呈先上升后下降的趋势,且在80 ℃左右最高,其中DPPH自由基清除能力和FRAP铁离子抗氧化能力分别为24.3 mg TE/g dw和105.0 mg TE/g dw。进一步分析冰菜多酚含量,发现80 ℃时冰菜中的原儿茶酸、香豆酸、绿原酸、阿魏酸、咖啡酸含量也显著高于其它温度处理组。此外,80 ℃热风干燥的冰菜色泽与冷冻干燥最为接近。80 ℃是冰菜热风干燥的最佳温度。

    Abstract:

    In this paper, the effects of different hot air drying temperatures (40, 60, 80, 100, 120 ℃) on drying kinetics, color, water activity, polyphenol content and antioxidant capacity (DPPH, FRAP) of ice plant were studied with freeze-drying considered as the control treatment. The results showed that the drying time for ice plant was shorter as the temperature increase. SLogistic1 model equation was found as the best fit at various temperatures, and the correlation coefficient (R2) was highest (>0.970). The total phenols, total flavonoids and antioxidant activities in ice plant increased with the increase of drying temperature (40-80 ℃). However, total phenols, total flavonoids and antioxidant activities decreased when the temperature higher than 80 ℃. And the DPPH and FRAP values of ice plant dried by 80 ℃ hot air were 24.3 mg TE/g dw and 105.0 mg TE/g dw, respectively. Furthermore, the content of protocatechuic acid, chlorogenic acid, caffeic acid, cumaric acid and ferulic acid in ice plant dried at 80 ℃ were significantly higher than those of other hot air drying temperature. On the other hand, ice plant dried by 80 ℃ hot air showed the lowest color differences compared with their freeze-dried counterpart. As a result, hot air-drying at 80 ℃ was a recommended drying method for ice plant.

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忻晓庭;刘大群;郑美瑜;李小琼;李乔;张程程.热风干燥温度对冰菜干燥动力学、多酚含量及抗氧化活性的影响[J].中国食品学报,2020,20(11):148-156

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  • 在线发布日期: 2020-12-04
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