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林业科学 ›› 2018, Vol. 54 ›› Issue (4): 128-133.doi: 10.11707/j.1001-7488.20180415

• 论文与研究报告 • 上一篇    下一篇

超临界CO2萃取红松松针甾醇的动力学和热力学

李亚峰, 修毅, 杨元直, 李晓彤, 郭庆启   

  1. 东北林业大学林学院 哈尔滨 150040
  • 收稿日期:2016-09-14 修回日期:2016-11-01 出版日期:2018-04-25 发布日期:2018-05-28
  • 基金资助:
    教育部东北林业大学大学生创新训练计划(201510225189);食品工程原理重点课程建设项目;教育部卓越农林人才培养改革试点项目(41110211)。

Kinetics and Thermodynamics Characteristics of Supercritical Carbon Dioxide Extraction Sterol from Korean Pine Needles

Li Yafeng, Xiu Yi, Yang Yuanzhi, Li Xiaotong, Guo Qingqi   

  1. School of Forestry, Northeast Forestry University Harbin 150040
  • Received:2016-09-14 Revised:2016-11-01 Online:2018-04-25 Published:2018-05-28

摘要: [目的]研究超临界CO2对红松松针甾醇的萃取作用,并对其动力学和热力学性质进行分析,为超临界CO2萃取植物化学有效成分提供参考。[方法]以甾醇得率为指标,在单因素试验基础上,重点探讨不同萃取压力和萃取时间对甾醇提取效果的影响,对萃取过程进行模型拟合并验证。[结果]松针甾醇超临界CO2萃取最佳工艺条件为:松针粉原料粒度80目、萃取压力25 MPa、CO2流量20 L·h-1、萃取温度60℃,此条件下的甾醇得率为(40.00±1.23) mg·(100 g)-1。当萃取压力为10、15和25 MPa时,一阶衰减指数函数模型拟合度最好(R2 ≥ 0.958 4),而当萃取压力为20 MPa时,逻辑斯蒂模型拟合度最好(R2=0.996 8)。验证试验结果表明,甾醇得率的最佳模型预测值与实测值之间的拟合程度变化范围为0.936 4~0.986 0。[结论]超临界CO2萃取松针甾醇的有效扩散系数(Deff)随萃取压力增大而增加,随萃取时间延长而减小,自由能ΔG变化表明超临界CO2萃取松针甾醇的传质过程为自发过程。

关键词: 红松松针, 甾醇, 超临界二氧化碳, 动力学, 热力学

Abstract: [Objective] Effects of supercritical carbon dioxide extraction sterol from Korean pine needles were investigated, and the related kinetics and thermodynamics were evaluated, the result could provide theoretical reference for the extraction of effective components from plants with supercritical carbon dioxide.[Method] With the yield of sterol as index, based on the single factor experiment result, the effects of extraction pressure and extraction time on the extraction of sterol were discussed, and the extraction process was fitting and verified.[Result] The optimum extraction process was as follows:the particles sizes of pine needles were 80 meshes, extraction pressure was 25 MPa, carbon dioxide flow was 20 L·h-1 and extraction temperature was 60℃, and the yield of sterol was (40.00±1.23) mg·(100 g) -1 under the optimum conditions. The kinetic analysis indicated that ExpDec1 model (R2 ≥ 0.958 4) was the best one to fit the extraction course when the extraction pressure was 10, 15 and 25 MPa respectively. While the Logistic model (R2=0.996 8) was the best when the extraction pressure was 20 MPa. The verification experimental result showed that the fitting degree range between the predicted values of the best models and the measured values were 0.936 4-0.986 0.[Conclusion] The effective diffusivity coefficient value of supercritical carbon dioxide extraction sterol from pine needles was enhanced concomitantly with increasing value of extraction pressure, while reduced with extraction time increased. The variety of free energy indicated that the mass transfer process of the supercritical carbon dioxide extraction sterol was a spontaneous process.

Key words: Korean pine needle, sterol, supercritical carbon dioxide, kinetics, thermodynamics

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