Abstract In this study, sunflower oil containing α-tocopherol (model for oxidizable lipophilic compounds) was encapsulated using a wall material made of maltodextrin and two different extracts rich in β-glucans and proteins, obtained from the basidiomycete Pleurotus ostreatus. A mixture of maltodextrin and acacia gum was used as control wall material. The aim was to assess P. ostreatus extracts as a sustainable and healthy alternative to common emulsifiers. After the evaluation of the emulsion stability, four powders were produced by spray drying and then analysed for the particle morphology and oil droplets distribution within the solid matrix (by scanning electron microscopy), the emulsion microstructure after their dissolution in water (by laser light diffraction) and the encapsulation efficiency (by solvent extraction of surface oil). In addition, powders were analysed in terms of oil protection against oxidation by spectroscopic determination of conjugated dienes and HPLC evaluation of vitamin E. Results showed that P. ostreatus extracts provided suitable emulsifying properties both in the liquid and in the spray dried emulsions. Moreover, it allowed excellent protection of vitamin E and polyunsaturated fatty acids against oxidation. Hence, P. ostreatus extracts can be exploited as innovative emulsifier to provide physical protection to functional, oxygen sensitive lipophilic ingredients by microencapsulation.

中文翻译：

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平菇β-葡聚糖在粉体包油水包油乳剂中的应用

摘要 在这项研究中，使用由麦芽糊精和两种富含 β-葡聚糖和蛋白质的不同提取物制成的壁材料封装了含有 α-生育酚（可氧化亲脂性化合物模型）的葵花籽油，这些提取物来自担子菌 Pleurotus ostreatus。麦芽糖糊精和阿拉伯胶的混合物用作控制壁材料。目的是评估 P. ostreatus 提取物作为普通乳化剂的可持续和健康替代品。在评价乳液稳定性后，通过喷雾干燥制备四种粉末，然后分析固体基质中的颗粒形态和油滴分布（通过扫描电子显微镜）、溶解在水中后的乳液微观结构（通过激光衍射） ) 和封装效率（通过表面油的溶剂萃取）。此外，通过共轭二烯的光谱测定和维生素 E 的 HPLC 评估，对粉末的抗氧化油保护进行了分析。结果表明 P. ostreatus 提取物在液体和喷雾干燥乳液中都提供了合适的乳化特性。此外，它还可以出色地保护维生素 E 和多不饱和脂肪酸免受氧化。因此，P. ostreatus 提取物可用作创新的乳化剂，通过微胶囊化为功能性、对氧敏感的亲脂性成分提供物理保护。骨草提取物在液体和喷雾干燥乳液中都提供了合适的乳化特性。此外，它还可以出色地保护维生素 E 和多不饱和脂肪酸免受氧化。因此，P. ostreatus 提取物可用作创新的乳化剂，通过微胶囊化为功能性、对氧敏感的亲脂性成分提供物理保护。骨草提取物在液体和喷雾干燥乳液中都提供了合适的乳化特性。此外，它还可以出色地保护维生素 E 和多不饱和脂肪酸免受氧化。因此，P. ostreatus 提取物可用作创新的乳化剂，通过微胶囊化为功能性、对氧敏感的亲脂性成分提供物理保护。