The aim of this study was to encapsulate garlic extract by complex coacervation method using whey protein isolate (WPI)/chitosan (CH) and gum Arabic (GA)/CH as wall materials. Two anionic biopolymers (GA and WPI) were used to find the most suitable wall materials to interact electrostatically with cationic CH. The complex coacervates were freeze-dried to obtain microparticles powders. The microparticles were examined for the nitrogen adsorption/desorption, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimeter (DSC), sorption isotherms, zeta potential, antioxidant activity, total phenolic content, solubility, moisture content, hygroscopicity, size distribution, and water activity. X-ray diffractograms evidenced microparticles with amorphous structure. WPI/CH and GA/CH microparticles showed surface area of 2.23 and 2.40 m² g⁻¹ and mean pore diameter of 5.20 and 5.37 nm, respectively. The nitrogen adsorption/desorption assay showed that microparticles presented mesopores and macropores that resulted in quick completion of microparticles surface monolayer with nitrogen. The sorption characteristics of microparticles followed the type II isotherm and Guggenheim-Anderson-de Boer (GAB) model was the best model to fit the experimental data. FTIR spectrum of microparticles reveals physical interactions between garlic compounds and functional groups of wall materials, indicating that garlic compounds were intact and encapsulated. TGA results indicated that the wall materials were effective in protecting the garlic sensitive compounds. The negative carboxyl groups (–COO⁻) of GA were better than WPI for coacervation with positive amino groups (NH₃⁺) of chitosan in terms of less hygroscopicity, smaller particle size, and higher retention of garlic phenolic compounds.

这项研究的目的是使用乳清蛋白分离物（WPI）/壳聚糖（CH）和阿拉伯树胶（GA）/ CH作为壁材料，通过复合凝聚法将大蒜提取物包囊起来。使用两种阴离子生物聚合物（GA和WPI）来找到最合适的壁材料，以与阳离子CH发生静电相互作用。将复合凝聚层冷冻干燥以获得微粒粉末。检查了微粒的氮吸附/解吸，傅立叶变换红外光谱（FTIR），X射线衍射（XRD），热重分析（TGA），差示扫描量热仪（DSC），吸附等温线，ζ电位，抗氧化剂活性，总含量酚含量，溶解度，水分含量，吸湿性，尺寸分布和水活度。X射线衍射图证明具有无定形结构的微粒。² g ^-1，平均孔径分别为5.20和5.37 nm。氮吸附/解吸试验表明，微粒呈现中孔和大孔，导致用氮快速完成微粒表面单层。微粒的吸附特性遵循II型等温线，Guggenheim-Anderson-de Boer（GAB）模型是适合实验数据的最佳模型。微粒的FTIR光谱揭示了大蒜化合物与壁材料的官能团之间的物理相互作用，表明大蒜化合物是完整的并被包封。TGA结果表明该壁材料可有效保护大蒜敏感化合物。负羧基（-COO ^-与壳聚糖的正氨基（NH ₃ ⁺）凝聚相比，GA优于WPI，这是因为它的吸湿性较小，粒径较小，并且大蒜酚类化合物的保留率更高。