Novel strategy for enhancing the color intensity of β-Carotene: Enriching onto the oil-water interface

Zhiming Gao; Binxian Wu; Bing Hu; Shaohua Cui; Longquan Xu; Ke Zhang; Katsuyoshi Nishinari; Glyn O Phillips; Yapeng Fang

doi:10.1016/j.jcis.2020.04.003

Novel strategy for enhancing the color intensity of β-Carotene: Enriching onto the oil-water interface

J Colloid Interface Sci. 2020 Aug 1:573:215-222. doi: 10.1016/j.jcis.2020.04.003. Epub 2020 Apr 2.

Authors

Zhiming Gao¹, Binxian Wu¹, Bing Hu¹, Shaohua Cui², Longquan Xu³, Ke Zhang¹, Katsuyoshi Nishinari¹, Glyn O Phillips¹, Yapeng Fang⁴

Affiliations

¹ Glyn O. Phillips Hydrocolloid Research Centre, School of Food and Biological Engineering, Hubei University of Technology, Nanli Road, Wuhan 430068, PR China.
² Wewow Nutrition and Health Center, Wewow Health Company, Guangzhou 510623, PR China.
³ China Tobacco Guizhou Industrial Co., Ltd., Kaifa Avenue, Guiyang 550000, PR China.
⁴ Glyn O. Phillips Hydrocolloid Research Centre, School of Food and Biological Engineering, Hubei University of Technology, Nanli Road, Wuhan 430068, PR China; Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, PR China. Electronic address: ypfang@sjtu.edu.cn.

PMID: 32278952
DOI: 10.1016/j.jcis.2020.04.003

Abstract

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.

Keywords: Beta-carotene; Color intensity; Emulsion; Food colorant; Interface.