☆ 4.4 Article

Chlorophylls, lutein and β-carotene play great but different roles in colour of rapeseed oil

COLORATION TECHNOLOGY (2022)

Journal

COLORATION TECHNOLOGY

Volume 138, Issue 6, Pages 660-673

Publisher

WILEY

DOI: 10.1111/cote.12627

Keywords

-

Categories

Chemistry, Applied Engineering, Chemical Materials Science, Textiles

Funding

Sichuan Science and Technology Program [2020YFN0148]
Sichuan Academy of Agricultural Sciences [2019QYXK031, 2021XKJS067]
Sichuan rape innovation team project of modern agricultural industry technology system [sccxtd-2021-03]

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Abstract

This study investigated the effects of three natural colourants (chlorophyll, lutein, and beta-carotene) on the colour of rapeseed oil. The concentrations of these colourants were found to have negative linear correlations with the brightness and colour of the oil. Chlorophyll had the greatest impact on brightness, while the two carotenoids contributed more to the yellow and red colours.

Natural colourants have great effects on the colour of vegetable oil. A series of colourant-oil simulation systems were constructed to study the effects of chlorophyll, lutein and beta-carotene and their interactions on the colour of rapeseed oil. CIE L*a*b* and Lovibond RYBN colour codes were used to evaluate the colour of the simulation systems. There were good negative linear correlations between the concentrations of the three natural colourants and L* value in both single colourant-oil and two colourants-oil simulation systems. Chlorophyll had greater effect on lightness of rapeseed oil than lutein and beta-carotene. The contribution of the two carotenoids to the yellow colour was greater than that of chlorophyll. Lutein and beta-carotene contributed positively to the red colour of rapeseed oil. They had superposition effect on colour of rapeseed oil, and beta-carotene might contribute more to the colour than lutein. It provided a method to evaluate the contribution of colourant to the colour and a possibility to regulate oil colour in edible oil industry.

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