Mechanism for improved protection of whey protein isolate against the photodecomposition of folic acid. (June 2018)

• Record Type: Journal Article
• Authors: Fu, Xiaojun; Wusigale, ; Cheng, Hao; Fang, Zheng; Liang, Li
• Is Part Of: Food hydrocolloids. Volume 79(2018)
• Page Start: 439
• Page End: 449
• Publication Date: 2018-06
• Subjects: Folic acid -- Whey protein isolate -- Decomposition -- Protection -- Mechanism; Hydrocolloids -- Periodicals; Food additives -- Periodicals; Colloïdes -- Périodiques; Aliments -- Additifs -- Périodiques; Colloids; Food additives; Periodicals; Electronic journals; 664.06
• DOI: 10.1016/j.foodhyd.2018.01.020
• Languages: English
• ISSNs: 0268-005X

Abstract

Abstract: Proteins have been widely used to prepare effective carriers for the protection of bioactive components. There were rare studies on proteins' change during protection and its impact on the protection, albeit they are important for the choosing of suitable proteins used as carrier materials. Folic acid is a synthetic form of folate but decomposes under ultraviolet irradiation. In this study, improved protection of whey protein isolate (WPI) against the photodecomposition of folic acid was investigated by using fluorescence and HPLC. During the vitamin decomposition, WPI's change was characterized in term of composition, structure, interaction with the vitamin or its decomposition products. Folic acid decomposition photosensitized indirect oxidation of WPI, leading to unfolding, degradation in concurrence with oligomerization. The increase in the absorbance and antioxidant activity contributed to the protein improved protection for folic acid. WPI could thus be a good carrier material for the encapsulation and protection of folic acid. Graphical abstract: Image 1 Highlights: Protection of WPI against folic acid decomposition increased during irradiation. Folic acid decomposition caused change of WPI composition and structure. The increased absorbance and antioxidant activity of WPI contributed to protection.