Hygroscopicity was determined according to
the method of Cai and Corke (2000), with slight
modifications. 2 g of spray-dried powder produced
were placed in a glass desiccator at 25±1.0°C
containing saturated Na2SO4 solution (81% RH). After
1 week, the samples were weighed. The hygroscopic
moisture (hygroscopicity) was expressed as g of
moisture per 100 g dry solids (g/100g).