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首页> 外文期刊>Quality Assurance and Safety of Crops & Foods >Effect of air temperature on drying kinetics, colour changes and total phenolic content of sage leaves (Salvia officinalis)
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Effect of air temperature on drying kinetics, colour changes and total phenolic content of sage leaves (Salvia officinalis)

机译：空气温度对干燥动力学的影响,颜色变化和总酚含量的圣人树叶(鼠尾草officinalis)

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摘要

The objective of the present study was to determine the influence of air temperature on the drying kinetics of sage leaves at temperatures of 45, 50, 55, 60, and 65 degrees C in a cabinet dryer. The drying time was significantly affected by temperature. Eight thin-layer drying models were used to describe the changes in moisture ratio as a function of time. The applicability of the models was determined regarding determination coefficient (R-2), reduced chi-square (chi(2)) and root mean square error (RMSE) values. The Midilli & Kucuk model showed the highest R-2, and lowest chi(2) and RMSE and was selected as the best model to describe drying characteristics of the sage leaves. Fick's second law was used to determine the effective moisture diffusivity (D-eff) at each temperature. Deff values were significantly affected by temperature and ranged from 1.62x10(-9) to 5.73x10(-9) m(2)/s. Temperature dependence parameters of Deff was described by the Arrhenius equation. Ea value was 52.52 kJ/mol for the given temperatures. Drying temperature significantly affected total phenolic content (TPC) and antioxidant activity (AA). Highest TPC and AA values were found from the samples dried at temperature 45 degrees C. This study suggested that sage leaves should be dried at a lower temperature due to lower phenolic degradation and colour change.
机译：本研究的目的是确定空气温度的影响干燥动力学鼠尾草叶子的温度45岁,50岁,55岁,60岁,65摄氏度的内阁干衣机。的温度。被用来描述水分的变化比例作为时间的函数。关于确定模型确定系数(r2),减少卡方(chi (2))和均方根误差(RMSE)值。Midilli,和最低气(2)和RMSE和被选为最好的模型来描述干燥特性圣人的树叶。确定有效水分扩散系数在每个温度(D-eff)。影响温度和范围从1.62 x10(9)到5.73 x10(9)米(2)/ s。温度依赖性Deff参数阿仑尼乌斯方程描述。52.52焦每摩尔为给定的温度。温度显著影响总酚类内容(TPC)和抗氧化活性(AA)。最高TPC和AA值被发现的样品干燥温度45度c研究表明,鼠尾草叶子应该干在较低温度下由于降低酚醛退化和颜色变化。

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