Abstract:The purpose of these studies was to identify a most suitable microcapsule wall material.β-carotene microcapsules with good stability and high embedding rates were prepared by embedding β-carotene，and assessing the microcapsules′water dispersibility and chemical stability.Pectin is a type of mucilaginous polysaccharide widely used in food and medicine production.In this study of different wall materials，and the impact of wall material ratios on β-carotene entrapment，two preparation formulations were used：1）whey protein isolate（WPI），or 2）a mixture of whey protein isolate and pectin.Both of these can form nano microcapsules with good water solubility，and the embedding rates of the products were 85.6% and 88.2% respectively.During incubation at room temperature，whey protein isolate and WPI-pectin mixture were embedded with β-carotene.The particle size of the-carotene microcapsules changed little，and their morphology was stable.