Structural and oxidative modifications, and antioxidant activity of β-lactoglobulin treated by ultraviolet light-C and ultrasound. (31st December 2017)

• Record Type: Journal Article
• Authors: Wu, Yuwei; Zheng, Yuanrong; Wang, Danfeng; Liu, Zhenmin; Deng, Yun
• Is Part Of: International journal of food properties. Volume 20(2017)Supplement 3
• Page Start: S3289
• Page End: S3300
• Publication Date: 2017-12-31
• Subjects: Ultraviolet light-C -- ultrasound -- β-lactoglobulin -- structure -- protein oxidation -- antioxidant activity; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664.0705
• DOI: 10.1080/10942912.2017.1397695
• Languages: English
• ISSNs: 1094-2912

Abstract

ABSTRACT: β-Lactoglobulin (β-Lg) was treated with ultraviolet light-C (UV-C) at 11.8 W m –2 or ultrasound at 900 W for 15 or 30 min. All treatments increased the β-structure, free sulfhydryl groups (FSH), dityrosine, and ABTS radical scavenging activity, but decreased the α-helicity, random coils, disulfide bonds (S–S), and intrinsic fluorescence intensity. UV-C treatment produced higher surface hydrophobicity (Ho), carbonyl, dityrosine, and antioxidant activity, and lower fluorescence intensity, total sulfhydryl group (TSH), and S–S compared with ultrasound treatment. UV-C treatment for 30 min gave the maximum Ho, carbonyl, dityrosine, and antioxidant activity, but the minimum TSH and S–S contents from β-Lg. Ultrasound treatment for 15 min produced the maximum β-sheet, TSH, and S–S contents, while treatment for 30 min gave the minimum carbonyl, dityrosine, and antioxidant activity. Data obtained in this study suggest that ultrasound and UV-C treatments demonstrated the potential for improving antioxidant activity in β-Lg, especially UV-C treatment.