Department of Food and Nutrition, University of Helsinki, P.O. Box 66 FIN-00014 HU, Finland; Helsinki Institute of Sustainability Science (HELSUS), University of Helsinki, P.O. Box 65 FIN-00014 HU, Finland.
Department of Food and Nutrition, University of Helsinki, P.O. Box 66 FIN-00014 HU, Finland.
Food Res Int. 2023 Feb;164:112333. doi: 10.1016/j.foodres.2022.112333. Epub 2022 Dec 20.
The most commonly-used and effective wall materials (WMs) for spray-dried microencapsulation of bioactive compounds are either costly, or derived from unsustainable sources, which lead to an increasing demand for alternatives derived from sustainable and natural sources, with low calories and low cost. Wood hemicelluloses obtained from by-products of forest industries appear to be attractive alternatives as they have been reported to have good emulsifying properties, low viscosity at high concentrations, high heat stability and low heat transfer. Here, we investigated the applicability of spruce galactoglucomannans (GGM) and birch glucuronoxylans (GX), to encapsulate flaxseed oil (FO, polyunsaturated fatty acid-rich plant based oil) by spray drying; and the results were compared to those of the highly effective WM, gum Arabic (GA). It was found that depending on solid ratios of WM:FO (1:1, 3:1 and 5:1), encapsulation efficiency of GGM was 88-96%, and GX was 63-98%. At the same encapsulation ratio, both GGM and GX had higher encapsulation efficiency than GA (49-92%) due to their ability to produce feed emulsions with a smaller oil droplet size and higher physical stability. In addition, the presence of phenolic residues in GGM and GX powders enabled them to have a greater ability to protect oil from oxidation during spray drying than GA. Physiochemical properties of encapsulated powders including thermal properties, morphology, molecular structure, particle size and water adsorption intake are also investigated. The study has explored a new value-added proposition for wood hemicelluloses which can be used as effective WMs in the production of microcapsules of polyunsaturated fatty acid-rich oils for healthy and functional products in food, pharmaceutical and cosmetic industries.
最常用和有效的壁材（WMs）用于生物活性化合物的喷雾干燥微胶囊化，要么成本高，要么来自不可持续的来源，这导致对替代物的需求不断增加，这些替代物来自可持续和天然来源，热量低且成本低。从森林工业的副产品中获得的木质半纤维素似乎是有吸引力的替代品，因为据报道它们具有良好的乳化性能、高浓度下的低粘度、高热稳定性和低传热性。在这里，我们研究了云杉半乳甘露聚糖（GGM）和桦木葡糖醛酸木聚糖（GX）在喷雾干燥时包封亚麻籽油（富含多不饱和脂肪酸的植物基油）的适用性，并将结果与高效 WM 阿拉伯胶（GA）进行了比较。结果发现，取决于 WM:FO（1:1、3:1 和 5:1）的固体比，GGM 的包封效率为 88-96%，而 GX 的包封效率为 63-98%。在相同的包封比下，由于能够形成更小油滴尺寸和更高物理稳定性的进料乳液，GGM 和 GX 的包封效率均高于 GA（49-92%）。此外，GGM 和 GX 粉末中存在的酚类残留物使它们在喷雾干燥过程中比 GA 更有能力保护油免受氧化。还研究了包封粉末的物理化学性质，包括热性质、形态、分子结构、粒径和水分吸附量。该研究探索了木质半纤维素的一种新的增值方案，它可以用作生产富含多不饱和脂肪酸的油的微胶囊的有效 WM，用于食品、制药和化妆品行业的健康和功能性产品。
