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考察不同粒径女贞子吸湿性变化。在25℃、相对湿度为75%条件下测定女贞子粉体的吸湿百分率,并采用数学模型对其吸湿性变化进行拟合,同时根据不同湿度下的吸湿平衡曲线测定其临界相对湿度。结果表明,女贞子粉体目数增大,吸湿速率加快,24目与50目粉体、80目与100目粉体差异不显著,各目数女贞子粉体在8 h后吸湿百分率急剧增加,约在72 h达到吸湿平衡;威布尔或Ritger-Pappas数学模型能较好地拟合女贞子粉体的吸湿变化。24目、50目、65目、80目、100目女贞子粉体的临界相对湿度依次减小,分别为69.3%、68.7%、68.0%、67.6%、67.2%、。该结果为女贞子粉体目数、生产与储存环境湿度的选择提供了试验依据。
To investigate the changes of hygroscopicity of Ligustrum lucidum with different particle size. The moisture absorption percentage of Ligustrum lucidum was measured under the conditions of 25 ℃ and relative humidity of 75%, and its hygroscopicity was fitted by mathematical model. The critical relative humidity was determined according to the hygroscopic equilibrium curve under different humidity. The results showed that the number of Ligustrum lucidum powder increased and the rate of moisture absorption accelerated. The difference between 24 mesh and 50 mesh powder, 80 mesh and 100 mesh powder was not significant. The percentage of hygroscopicity of Ligustrum lucidum powder after 8 h Which increased rapidly and reached the hygroscopic equilibrium at about 72 h. The Weibull or Ritger-Pappas mathematical model could well fit the hygroscopic changes of Ligustrum lucidum powder. The critical relative humidity of 24 mesh, 50 mesh, 65 mesh, 80 mesh and 100 mesh Saccharomyces cerevisiae decreased by 69.3%, 68.7%, 68.0%, 67.6% and 67.2%, respectively. The result provided the experimental basis for selecting the number of Ligustrum lucidum powder and the humidity of production and storage environment.