文献类型：期刊文献

中文题名：基于真空冷冻-热泵联合干制鱼片的解吸-吸附等温线及热力学特性

英文题名：Desorption-adsorption isotherms and thermodynamic characteristics of dried fish fillets by combined drying of freeze-heat vacuum pump

作者：罗静[1];李敏[2];关志强[2];张莹[1];刘岩[2]

机构：[1]广东海洋大学食品科技学院,广东省水产品加工与安全重点实验室,广东湛江524088;[2]广东海洋大学机械与动力工程学院,广东湛江524088

年份：2021

卷号：36

期号：6

起止页码：1050

中文期刊名：大连海洋大学学报

外文期刊名：Journal of Dalian Ocean University

收录：CSTPCD、、CSCD2021_2022、北大核心、CSCD、北大核心2020

基金：广东省自然科学基金(2015A030313613)。

语种：中文

中文关键词：干制罗非鱼片;解吸-吸附等温线;热力学性质;真空冷冻;热泵

外文关键词：dried tilapia fillet;desorption-adsorption isotherm;thermodynamic property;vaccum freezing;heat pump

中文摘要：为探讨超声波辅助聚葡萄糖渗透预处理结合真空冷冻-热泵联合干燥罗非鱼片的品质及其后期贮藏稳定性,采用静态称重法测定真空冷冻-热泵联合干制罗非鱼片在25、35、45℃时及水分活度(a_(w))为0.1116~0.8434时的解吸-吸附等温线,选取8种常见的数学模型对解吸-吸附等温线数据进行拟合,通过决定系数(R^(2))和均方误差(E_(MS))确定解吸-吸附等温线的最佳模型,再根据干制罗非鱼片在不同温度下的解吸-吸附等温线数据获取干制罗非鱼片的热力学性质。结果表明:干制罗非鱼片的水分解吸-吸附呈Ⅲ型等温线,Peleg模型是描述真空冷冻-热泵联合干制罗非鱼片解吸-吸附等温线的最佳模型,同时获得25、35、45℃条件下干制罗非鱼片的绝对安全含水率分别为16.30%、13.68%、13.64%,相对安全含水率分别为22.89%、19.21%、19.77%;干制罗非鱼片的净等量吸附热、等量解吸热、微分熵均随平衡含水率上升呈现指数递减,解吸与吸附过程均由焓驱动,且均属于非自发性。研究表明,不同贮藏温度和水分活度对干制罗非鱼片的解吸-吸附等温线及热力学性质有较大影响,该研究结果可为罗非鱼片的干燥工艺优化及贮藏条件的设置提供数据参考。

外文摘要：In order to explore the quality and later storage stability of tilapia fillets that were dried by pretreatment of ultrasonic assisted polydextrose permeation combined with vacuum freeze-heat pump combined drying,the desorption-adsorption isothermal data of vacuum freeze-heat pump combined drying tilapia fillets were obtain by a static method at 25,35,and 45℃,with the water activity(a_(w))between 0.1116-0.8434.The results of desorption-adsorption isotherms were fitted by 8 common mathematical models,in which the optimal model was used to describe the desorption-sorption isotherms of dried tilapia fillets determined by comparing the coefficient of determination of the models(R^(2))and root mean square error.The thermodynamic properties of dried tilapia fillets were investigated by the desorption-adsorption isotherm data of dried tilapia fillets at different temperatures.The results showed that the desorption-sorption isotherm of dried tilapia fillets belonged to typeⅢ,the Peleg is the best model to describe the desorption-adsorption isotherm of tilapia fillets of heat pump combined drying.Meanwhile,there was 16.30%of absolute safe moisture of dried tilapia fillets at 25℃,13.68%of absolute safe moisture at 35℃and 13.64%of absolute safe moisture at 45℃,with the relative safe moisture of 22.89%at 25,19.21%at 35℃,and 19.77%at 45℃.The net adsorption heat and the differential entropy of dried tilapia fillets were shown to be decreased exponentially with the increase in the equilibrium moisture.The desorption-adsorption processes were driven by the non-spontaneous enthalpy.The findings indicated that the desorption-adsorption isotherm and thermodynamic properties of dried tilapia fillets were affected by different storage temperatures and water activity,which can provide the theoretical basis for the process optimization and storage setting of tilapia fillets drying.