Glyn O. Phillips Hydrocolloid Research Centre, School of Food and Biological Engineering, Hubei University of Technology, Nanli Road, Wuhan 430068, PR China.
Wewow Nutrition and Health Center, Wewow Health Company, Guangzhou 510623, PR China.
J Colloid Interface Sci. 2020 Aug 1;573:215-222. doi: 10.1016/j.jcis.2020.04.003. Epub 2020 Apr 2.
A novel strategy to enhance the color intensity of β-carotene (BC), namely, "interfacial enriching", was developed in this work. As the sole emulsifier in W/O emulsion, BC particles were enriched onto the droplet surface through emulsifying process. By increasing the concentration of BC in oil phase from 1 mg/g to 5 mg/g, the average droplet size of the emulsion decreased from 92.2 ± 5.1 μm to 34.0 ± 5.4 μm. Too low (e.g. ≤ 1 mg/g) or too high (e.g. ≥25 mg/g) concentration of BC in the oil phase yielded an insufficient coverage or flocculation of the droplets. By enriching onto the interface, the color intensity of BC were enhanced apparently at the reflectance wavelength ranging from 500 nm to 700 nm, compared with that of the BC encapsulated within the emulsion droplets. This enhancement was due to the higher availability of incident light for the BC particles on the interface than that of the BC particles buried inside the droplets.
本工作提出了一种增强β-胡萝卜素（BC）颜色强度的新策略，即“界面富集”。BC 颗粒作为 W/O 乳液中的唯一乳化剂，通过乳化过程富集在液滴表面。通过将油相中的 BC 浓度从 1mg/g 增加到 5mg/g，乳液的平均液滴尺寸从 92.2±5.1μm 减小到 34.0±5.4μm。油相中的 BC 浓度过低（例如，≤1mg/g）或过高（例如，≥25mg/g）都会导致液滴的覆盖或聚集不足。通过在界面上富集，与包埋在乳液液滴内的 BC 相比，BC 在反射波长为 500nm 至 700nm 的范围内的颜色强度明显增强。这种增强归因于界面上的 BC 颗粒比埋藏在液滴内的 BC 颗粒更能有效地利用入射光。
