Abstract

Carotenoids isolated from orange peels were determined physicocohemical properties with TLC, UV-spectrophotometer and HPLC etc., and the results were as follows . Maximum absorption wavelength of the isolated carotenoids was 415nm when the result was similar to $\beta$-carotene as 423nm. Eight spots were obtianed from TLC, and identified lutein, lycopene, $\alpha$-carotene and $\beta$-carotene with HPLC. The effect pH during the storage period of isolate carotenoids, the period when the amount of pigment retention was over 50% in pH 5, 6 and 7 , after 10 days . The amount of pigment retention was lower in control than in treatment of sugars such as fructose, glucose and sorbitol , but sucrose was similar to the control, Isolated carotenoids were stable to ascorbic acid, and the amount of pigment retention was over 70% after 10 days. The amount of pigment retention in the effect oforganic acid was higher in treated citric acid , lactic acid and tartaric acid than in control, but lower in treated maleic acid and succinic acid. Isolated carotenoids were stable at 50 $^{\circ}C$, and the amount of pigment retention was over 50% at 10$0^{\circ}C$.

Keywords

• orange peels;
• carotenoids;
• physicochemical properties

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References

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