ABSTRACT

Physical properties of Sukkari date powder (SDP) at different particle sizes, namely, moisture content, water activity, tapped and bulk densities, compressibility index, Hausner ratio, water absorption, and solubility indices, swelling capacity, and color parameters were experimentally determined. The SDP moisture sorption experiments were conducted using a dynamic vapor sorption instrument in the relative humidity range 10%–90% at 20, 40, and 60^°C. Among the ten tested sorption models, the GAB and modified GAB models best fitted SDP sorption data. The monolayer moisture content decreased with increasing temperature. The differential enthalpy and entropy, and net integral enthalpy and entropy decreased consistently with increasing moisture content. The linear relationship between differential enthalpy and entropy confirmed the applicability of the compensation theory. The estimated values of the isokinetic and harmonic temperatures and the Gibbs free energy change revealed that the sorption process is non-spontaneous and enthalpy driven.

摘要

通过实验确定了Sukkari枣粉（SDP）在不同粒径下的物理性质，即水分含量，水分活度，堆积密度和堆积密度，可压缩指数，Hausner比，吸水率和溶解度指数，溶胀能力以及颜色参数。使用动态蒸汽吸附仪在20、40和60 ^°的相对湿度范围为10％–90％的条件下进行SDP水分吸附实验C.在十个测试的吸附模型中，GAB和改进的GAB模型最适合SDP吸附数据。单层水分含量随温度升高而降低。随着水分含量的增加，微分焓和熵以及净积分焓和熵不断降低。微分焓和熵之间的线性关系证实了补偿理论的适用性。等速和谐波温度以及吉布斯自由能变化的估计值表明，吸附过程是非自发的和焓驱动的。