首页|麦芽糊精对党参喷干粉吸湿特性及热力学性质的影响

麦芽糊精对党参喷干粉吸湿特性及热力学性质的影响

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研究麦芽糊精(maltodextrin，MD)对党参(DS)喷雾干燥粉的水分吸附特性及热力学性质的影响，考察喷干粉在吸湿过程中的水分变化和能量变化。采用静态称量法测定喷干粉在 3 个温度(25、35、45℃)和 6 个饱和盐溶液(KAc、MgCl2·6H2 O、K2 CO3、NaBr、NaCl和KCl)下的等温吸湿数据，利用6 种吸湿模型进行拟合并对拟合的模型进行评价而选出最适合的模型，进一步计算出相应的净等量吸附热与微分熵，积分吸附熵变，依据熵-焓互补理论绘制出净等量吸附热与微分熵之间的线性关系。研究发现，DS与DS-MD喷干粉的水分吸附特性都遵循Ⅲ型等温线，最适模型皆为GAB模型，单分子层含水量M0 随着温度的升高而降低;相同温度下，DS喷干粉的M0 随着MD的添加而降低。DS与DS-MD喷干粉的净等量吸附热和微分熵随着含水量的增加而降低，且两者呈线性关系。喷干粉的积分吸附熵变最小时对应的水分活度随着MD的添加而变小，体系越稳定，表明添加MD后喷干粉越稳定。
Effects of maltodextrin on water adsorption and thermodynamic properties of Codonopsis Radix spray-dried powder
This study aims to reveal the effects of maltodextrin(MD)on the water adsorption and thermodynamic properties of Codonopsis Radix(DS)spray-dried powder by determining the moisture and energy changes of the powder in the process of moisture absorption.The static weighing method was used to obtain the isothermal water adsorption data of the spray-dried powder in 6 saturated salt solutions(KAc,MgCl2·6H2 O,K2 CO3,NaBr,NaCl,and KCl)at 3 temperatures(25,35,and 45℃).Six models were used for fitting of the water adsorption process,and the most suitable model was selected based on the model performance.Furthermore,the corresponding net equivalent adsorption heat and differential entropy were calculated,and the adsorption entropy change was integrated.The linear relationship between net equivalent adsorption heat and differential entropy was drawn based on the entropy-enthalpy comple-mentarity theory.The results showed that the water adsorption properties of DS and DS-MD spray-dried powder followed the type Ⅲ iso-therm and was well fitted by the GAB model.The monolayer water content M0 decreased with the increase in temperature.At the same temperature,the M0 of DS spray-dried powder decreased after the addition of MD.The net equivalent adsorption heat and differential entropy of DS and DS-MD spray-dried powder decreased with the increase in water content,which presented a linear relationship.The addition of MD decreased the water activity corresponding to the lowest integral adsorption entropy of the powder,and the system be-came more stable.The results indicated that the spray-dried powder became more stable after the addition of MD.

Codonopsis Radixmaltodextrinwater activityisothermal adsorptionthermodynamic property

刘慧、罗晓健、何雁、张尧、谢茵、饶小勇

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江西中医药大学, 江西 南昌 330006

江西省药品检验检测研究院, 江西 南昌 330029

江西本草天工科技有限责任公司, 江西 南昌 330006

江西省中医药研究院, 江西 南昌 330000

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党参 麦芽糊精 水分活度 等温吸附 热力学性质

江西省重点研发计划项目江西省中医药中青年骨干人才(第一批)培养计划项目江西省主要学科和技术带头人培养计划-领军人才项目南昌市高层次科技创新人才"双百计划"项目

20212BBG71007赣中医药科教字[2020]2号20204BCJ22032洪科字[2022]321号

2024

10.19540/j.cnki.cjcmm.20231211.302

中国中药杂志
中国药学会

中国中药杂志

CSTPCD北大核心
影响因子：1.718
ISSN：1001-5302
年,卷(期)：2024.49(6)
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