a School of Agricultural Engineering , University of Campinas , Campinas , Brazil.
b Faculty of Engineering , Federal University of Grande Dourados , Dourados , Brazil.
J Microencapsul. 2018 Aug;35(5):482-493. doi: 10.1080/02652048.2018.1538264. Epub 2018 Nov 30.
This research work aimed to obtain blackberry pulp powder by spray drying and, by an experimental design, evaluated the effect of inlet air temperature (100-150 °C) and blackberry pulp solids:arrowroot starch/gum arabic solids ratio of 1:0.5-1:2 on the physicochemical properties of the powders. Arrowroot starch and gum arabic present glass transition temperature (Tg) values above 100 °C; hence it was possible to employ them as carriers in blackberry pulp spray drying in order to increase Tg of the system. Powder yield and solubility increased with increasing blackberry pulp solids:arrowroot starch/gum arabic solids ratio of 1:0.5-1:2, whereas hygroscopicity decreased. Yield, solubility and hygroscopicity of the powders increased and water activity decreased, with increasing inlet air temperature. The powders presented low moisture content and water activity. Temperature of 143 °C and blackberry pulp solids:arrowroot starch/gum arabic solids ratio of 1:1.78 were the optimal conditions to obtain high yield and blackberry powders that are soluble in water and less hygroscopic.
本研究旨在通过喷雾干燥获得黑莓浆粉，并通过实验设计，评估进风温度（100-150°C）和黑莓浆固形物：木薯淀粉/阿拉伯胶固形物比 1:0.5-1:2 对粉末物理化学性质的影响。木薯淀粉和阿拉伯胶的玻璃化转变温度（Tg）值均高于 100°C；因此，它们可以作为载体用于黑莓浆喷雾干燥，以提高体系的 Tg。随着黑莓浆固形物：木薯淀粉/阿拉伯胶固形物比 1:0.5-1:2 的增加，粉末得率和溶解度增加，而吸湿性降低。随着进风温度的升高，粉末的产率、溶解度和吸湿性增加，水分活度降低。所得粉末具有低含水量和低水分活度。143°C 的温度和黑莓浆固形物：木薯淀粉/阿拉伯胶固形物比 1:1.78 是获得高产率和水溶性好、吸湿性低的黑莓粉末的最佳条件。
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