针对薄荷醇易挥发损失,在油基食品中应用受限的问题,该研究以不同添加量的果胶作为内水相凝胶剂,构建负载薄荷醇的内相凝胶油包水乳液,分析果胶浓度对乳液形态结构、薄荷醇包封能力以及流变特性和界面特性的影响,监测油包水乳液的离心稳定性、热稳定性和贮藏稳定性,阐明果胶对油包水乳液薄荷醇负载性能的提升作用。结果表明,当果胶添加量为1.6%(质量分数)时,乳液具有最小的粒径[(1.19±0.05) μm]和最高的薄荷醇包封率。添加果胶提高了乳液的黏度、降低了油水界面张力。稳定性分析显示,果胶的添加显著提高了乳液的离心稳定性和热稳定性。添加1.6%果胶的乳液贮藏28 d后,薄荷醇保留率仍高于80%,表明添加果胶能够有效提高油包水乳液的薄荷醇负载性能,为薄荷醇在油基食品中的应用提供数据参考。
To solve the problem of easy volatile loss of menthol and limited application in oil-based foods, in this study, different concentrations of pectin were used as internal aqueous gelling agents to construct an internal phase gel water-in-oil emulsion loaded with menthol, and the effects of pectin concentration on the morphological structure, encapsulation ability, rheological properties and interface properties of the emulsion were analyzed, the centrifugal stability, thermal stability and storage stability of water-in-oil emulsion were monitored, and the effect of pectin on menthol loading performance of water-in-oil emulsion was clarified.Results showed that when the pectin mass concentration was 1.6%, the emulsion had the smallest particle size [(1.19±0.05) μm] and the highest menthol encapsulation efficiency.The addition of pectin increased the viscosity of the emulsion and reduced the oil-water interfacial tension.Stability analysis showed that the addition of pectin significantly improved the centrifugal stability and thermal stability of the emulsion.After 28 days of storage in the emulsion with 1.6% pectin, the retention rate of menthol was still higher than 80%, indicating that the addition of pectin could effectively improve the menthol loading performance of water-in-oil emulsions, and provide data reference for the application of menthol in oil-based foods.
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