Curi-Borda Cecilia K, Linares-Pastén Javier A, Tat Tuba, Tarqui-Dueñas Rosmery, Chino-Flores Ninoska, Alvarado Juan-Antonio, Bergenstahl Bjorn
Food Science and Technology Department, Lund University, P.O. Box 124, SE-22100 Lund, Sweden.
Institute of Chemical Research, Universidad Mayor de San Andrés, 27th Cota Cota, P.O. Box 303, La Paz, Bolivia.
Foods. 2019 Mar 22;8(3):108. doi: 10.3390/foods8030108.
Bixin is a hydrophobic carotenoid present in the integument of the seeds of . Microencapsulation was applied to obtain water dispersible formulations and protect the colorant against degradation. Microencapsulated systems were obtained by spray-drying a mild alkaline bixin dispersion with different encapsulating materials. The encapsulation trials were performed with and without native carbohydrates of the integument in addition to the main encapsulant. It was possible to dry dispersions with up to 10% bixin counted on total solids. All the studied systems were characterized by colorimetry, UV-vis spectroscopy, Scanning Electron Microscopy, light microscopy, turbidometric sedimentation analyses and laser light diffraction analyses. All the systems showed aqueous dispersibility but displayed differences in their transparency, UV-vis spectra and physical stability at pH 3. The results show that the native carbohydrates enhance the encapsulation efficiency of other encapsulating materials. The chemical composition of this native carbohydrate fraction shows the presence of polysaccharides containing arabinose, galactose and glucose as monomers. Starch was identified enzymatically. The native carbohydrates allowed the encapsulation of bixin in its native microcrystalline form, resulting in a multilayer structure after spray-drying. In addition, the colorant particles displayed dispersibility under acidic aqueous conditions suggesting that they are stabilized by the native carbohydrates after the microcapsules are dissolved.
胭脂树橙是一种存在于胭脂树种子外皮中的疏水性类胡萝卜素。采用微胶囊化技术来获得水分散性制剂，并保护着色剂不被降解。通过用不同的包囊材料对温和碱性的胭脂树橙分散液进行喷雾干燥来制备微胶囊化体系。除了主要包囊剂外，还在有和没有种子外皮天然碳水化合物的情况下进行包囊试验。以总固体计，能够干燥含高达10%胭脂树橙的分散液。所有研究的体系都通过比色法、紫外-可见光谱法、扫描电子显微镜、光学显微镜、比浊沉降分析和激光衍射分析进行了表征。所有体系都表现出水分散性，但在透明度、紫外-可见光谱和pH 3时的物理稳定性方面存在差异。结果表明，天然碳水化合物提高了其他包囊材料的包囊效率。这种天然碳水化合物组分的化学组成显示存在以阿拉伯糖、半乳糖和葡萄糖作为单体的多糖。通过酶法鉴定出了淀粉。天然碳水化合物使胭脂树橙以其天然微晶形式被包囊，喷雾干燥后形成多层结构。此外，着色剂颗粒在酸性水条件下表现出分散性，这表明微胶囊溶解后它们被天然碳水化合物稳定化。
