Morphology of Powder of Functional Fatty Acids and Stability Control with Powder Formation

从释药特性和氧化稳定性两个方面考察了包埋d-柠檬烯的稳定性。释放速率和氧化速率与相对湿度密切相关。这种依赖关系并不简单，水的活度对释放和氧化速率的影响存在差异。这一结果可以用粉末结构的变化来解释，在储存过程中，无定形胶囊基质变成了糊状物质。释放速率常数和氧化速率常数在玻璃化转变温度附近的储存温度出现最大值，大颗粒比小颗粒具有更高的稳定性和更低的释放速率。此外，除了乳滴大小对喷雾干燥过程中的保留率有影响外，乳状液的大小也影响微囊化香精的稳定性。香精小颗粒的稳定性低于大颗粒香精，特别是对于简单的香精(d-柠檬烯)的零级动力学氧化。激光共聚焦显微镜是研究喷雾干燥粉末非破坏性结构形态的有效工具。这些结果表明，喷雾干燥粉末在较高的温度下表现出较多的粉末量和较大的空泡尺寸，从而导致较低的粉末密度，这为该行业提供了明显的包装优势。此外，激光共聚焦显微镜是研究包埋食品粉末的一种新的、具有挑战性的新方法。

The stability of encapsulated d-limonene was studied in view of the release characteristics and oxidation stability. The release rate and the oxidation rate were closely related to the relative humidity. The dependence was not simple and a discrepancy in the effect of water activity on the release and oxidation rates was found. The results could be explained by a change in the powder structure, where the amorphous capsule matrix was changed into a paste-like mass during storage. The release and the oxidation rate constants showed the maximum value at the storage temperature near the glass transition temperature.The large powder size showed the higher stability and lower release of encapsulated flavor than the small powder size. Furthermore, in addition to the effect of emulsion droplet size on the retention during spray drying, the emulsion size also affected the stability of encapsulated flavor powder. The small flavor size in the powder showed the lower stability than the large size of flavor especially for the simple zero order kinetic oxidation of flavor (d-limonene). CLSM was shown to be a useful tool for studying the morphology with a non-destructive structure of spray-dried powder. These results suggest that spray-dried powder at higher temperatures shows a larger amount of powder with the vacuole inside and the larger vacuole size resulting lower density of powder which provides an obvious packaging advantage for the industry. Furthermore, CLSM can be useful the new challenging novel method for studying the encapsulated food powder.