Novel composite gels of gelatin and soluble dietary fiber from black bean coats with interpenetrating polymer networks. (October 2018)

• Record Type: Journal Article
• Authors: Xia, Qi; Gu, Meidong; Liu, Jie; Niu, Yuge; Yu, Liangli (Lucy)
• Is Part Of: Food hydrocolloids. Volume 83(2018)
• Page Start: 72
• Page End: 78
• Publication Date: 2018-10
• Subjects: Gelatin -- Soluble dietary fiber -- Interpenetrating polymer network -- Gelling properties -- Bile acid binding; Hydrocolloids -- Periodicals; Food additives -- Periodicals; Colloïdes -- Périodiques; Aliments -- Additifs -- Périodiques; Colloids; Food additives; Periodicals; Electronic journals; 664.06
• DOI: 10.1016/j.foodhyd.2018.04.043
• Languages: English
• ISSNs: 0268-005X

Abstract

Abstract: The soluble dietary fiber (SDF) extracted from black bean coats was used to produce a novel composite gel with gelatin by forming an interpenetrating polymer network (IPN). The gel prepared by the cross-linking of transglutaminase (TG) and Ca 2+ was called IPN gel, and the gel prepared only by TG or Ca 2+ was named as G-semi-IPN and F-semi-IPN, respectively. The rheology and micro-morphology were observed to confirm the formation of semi-IPN and IPN. The thermodynamic, mechanical and hydration properties of gelatin-SDF composite gels with different cross-linking conditions were determined. It was found that the IPN gel had enhanced mechanical properties, better freeze-thaw stability and lower swelling capacity. Bile acid binding assays showed that both semi-IPNs and IPN had certain ability of binding bile acids. These studies on gelatin-SDF composite gels suggested a new strategy to increase the gelling ability of dietary fibers. In addition, it could improve the utilization of bean coats during the food processing. Graphical abstract: Image Highlights: The soluble dietary fiber was composited with gelatin by IPN technique. The rheology and micro-morphology results confirmed the formation of IPNs. IPN improved mechanical properties and hydration properties. The IPN gels presented an obviously enhanced bile acid binding capacity.