Abstract

Lemon juice was mixed with different carrier materials (maltodextrin, gum Arabic, carboxymethylcellulose) and dehydrated by nano spray drying, conventional spray drying and freeze-drying technique. The obtained powders were compared in terms of their morphology, moisture content, density, porosity, flow and reconstitution properties, and water sorption kinetics. Freeze-dried powders showed an irregular, compact morphology, while spray drying led to more uniformly sized fine spherical particles. Spray-dried powders with gum Arabic had low moisture, high density, but long wetting times and fair dispersibility linked to their smaller particle size and even surface. Fine particle characteristics of nano spray dried powders did not seem to favor their flow and dissolution properties while enhanced their moisture uptake. Conversely, carboxymethylcellulose-containing powders exhibited inferior characteristics likely due to their highly hygroscopic and aggregated structure.

摘要

柠檬汁与不同载体材料（麦芽糖糊精、阿拉伯树胶、羧甲基纤维素）混合，通过纳米喷雾干燥、常规喷雾干燥和冷冻干燥技术进行脱水。对所得粉末的形态、水分含量、密度、孔隙率、流动和重构性能以及吸水动力学进行比较。冷冻干燥的粉末表现出不规则、致密的形态，而喷雾干燥导致尺寸更均匀的细球形颗粒。含有阿拉伯树胶的喷雾干燥粉末水分低、密度高，但润湿时间长，分散性好，这与它们较小的粒径和均匀的表面有关。纳米喷雾干燥粉末的细颗粒特性似乎不利于它们的流动和溶解特性，同时增强了它们的吸湿性。反过来，