摘要
为了提高黄芩等中药材的干燥品质,保证其临床应用安全有效,采用变异系数法研究了鲜黄芩的最优干燥方式,在此基础上分析了黄芩的干燥特性,并应用3种常见的干燥动力学模型及3种反应动力学模型分别探究了不同干燥条件下黄芩的干燥动力学特征和黄芩苷的降解动力学特征.研究结果表明:黄芩间歇微波热风组合干燥方式的综合质量评分最高为90.00分,更适用于黄芩的干燥加工.黄芩的干燥速率随微波功率增大、间歇比的减小而增大,随热风温度的增大先增大后减小.Weibull模型可以用来描述黄芩在不同干燥条件下水分的变化规律,其R2均大于0.993 4,不同干燥条件下黄芩的有效水分扩散系数为1.370 8×10^(-7)~3.250 6×10^(-7)m^(2)/s,活化能为11.415 5 kJ/mol.黄芩苷含量随时间的变化符合2级反应动力学规律,且黄芩苷的降解受到温度、水分、氧气、酶活性以及干燥时间等众多因素协同作用的影响.上述研究可为黄芩等中药材的干燥加工提供一种优质高效的干燥方法,为其干燥工艺优化提供参考,对指导黄芩等中药材实际生产和提高其干燥质量具有重要意义.
In order to improve the drying quality of Chinese medicinal herbs(CMH)such as fresh Scutellaria baicalensis,and ensure their safe and effective clinical application,the coefficient of variation method was used to investigate the optimal drying method for the fresh in this study.Three common drying kinetic models for CMH were applied to explore the drying kinetics,while three degradation kinetic models were used to study the degradation kinetics of baicalin under different drying conditions.The results showed that the comprehensive quality score of the intermittent microwave-hot air combined drying method for S.baicalensis was the highest at 90.00 points,signifying its suitability for the flesh′s drying.The drying rate of S.baicalensis increased with the increase in microwave power and the decrease in pulsation ratio,and it exhibited an initial increase followed by a decreased with the increase in hot air temperature.The Weibull model could be used to describe the pattern change of moisture under different drying conditions,with an R 2 value greater than 0.9934.The D was in the range of 1.3708×10^(-7) to 3.2506×10^(-7) m^(2)/s under different drying conditions,and the E was 11.4155 kJ/mol.The variation of baicalin content with time followed second-order reaction kinetics,and the degradation of baicalin was influenced by factors such as temperature,moisture,oxygen,enzyme activity,and drying time in a synergistic manner.The research provides a high-quality and efficient drying method for CMH,offering reference for optimizing its drying process.It is of great significance for guiding the actual production and improving the drying quality of CMH.
作者
徐英英
袁越锦
商涛
文怀兴
赵哲
XU Ying-ying;YUAN Yue-jin;SHANG Tao;WEN Huai-xing;ZHAO Zhe(College of Mechanical and Electrical Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China;Shaanxi Engineering Research Center of Drying and Comprehensive Utilization on Agricultural Resources(Shaanxi University of Science&Technology),Xi′an 710021,China;College of Mechanical Engineering,Sichuan University of Science&Engineering,Yibin 644000,China)
出处
《陕西科技大学学报》
北大核心
2024年第3期65-75,共11页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(51876109)
陕西省教育厅青年创新团队科研计划项目(22JP012)。
关键词
黄芩
间歇微波热风组合干燥
干燥动力学
降解动力学
Scutellaria baicalensis
intermittent microwave-hot air combined drying
drying kinetic
degradation kinetic
