食品工业科技2017，Vol.38Issue(19)：154-160,7.DOI:10.13386/j.issn1002-0306.2017.19.029
超声波辅助离子液体提取石榴籽中原花青素的工艺及其动力学与热力学分析
Optimization and kinetic/thermodynamics analysis of ionic liquid based ultrasonic-assisted extraction of proanthocyanidins from pomegranate seeds
摘要
Abstract
The ionic liquid based ultrasonic-assisted extraction conditions of proanthocyanidins fron pomegranate seeds were studied.Single factor test and Box-Behnken experimental design were used to optimize the extraction process employing proanthocyanidins yield as the response,and extraction time,extraction temperature,ultrasonic power and concentration of ionic liquid were used as independent variables.The kinetics and thermodynamics of extraction process was studied basing the optimized extraction conditions.Results showed that the optimal extraction conditions for proanthocyanidins were determined as follows:extraction time of 32 min,extraction temperature of 52 ℃,ultrasonic power of 300 W,and concentration of ionic liquid of 1.15 mol/L.Under these conditions,the yield of proanthocyanidins was 1.718％.Kinetic parameters showed that extraction rate constant k value was 0.313 min-1,surface diffusion coefficient Ds value was 7.936 × 10-5 cm2/min while those of ethanol control group were 0.063 min-1 and 1.597 × 10-5 cm2/min,respectively,and the extraction rate was significantly improved.Thermodynamics parameters showed that entropy ΔH was 248.51 kJ/mol,enthalpy ΔS was 813.69 J/ (mol· K),the values were all greater than zero,indicating that the ionic liquid extraction process was an endothermic process of increasing entropy,at the same time,the free energy ΔG was-18.254 kJ/mol,less than zero,indicating that the ionic liquid extraction process was a spontaneous process.Both the optimized ionic liquid extraction technique and dynamics/thermodynamics analysis can be used for industrial scale-up and optimal control of proanthocyanidins extraction from pomegranate seeds.关键词
石榴籽/原花青素/超声波/离子液体/动力学/热力学Key words
pomegranate seed/proanthocyanidins/ultrasonic/ionic liquid/kinetic analysis/thermodynamics analysis分类
轻工纺织引用本文复制引用
王占一,郑丹丹,张立华,王玉海,戴博,李卓瓦..超声波辅助离子液体提取石榴籽中原花青素的工艺及其动力学与热力学分析[J].食品工业科技,2017,38(19):154-160,7.基金项目
2015年度国家星火计划项目(2015GA740027) （2015GA740027）
山东省自然科学基金项目(ZR2013BL018) （ZR2013BL018）
山东省重点研发计划项目(2016GSF202010). （2016GSF202010）
