Calcium spraying for fabricating collagen-alginate composite films with excellent wet mechanical properties. (March 2022)

• Record Type: Journal Article
• Authors: Ma, Yuxin; Ma, Yun; Yu, Zhe; Chiou, Bor-Sen; Liu, Fei; Zhong, Fang
• Is Part Of: Food hydrocolloids. Volume 124:Part B(2022)
• Publication Date: 2022-03
• Subjects: Collagen -- Alginate -- Composite film -- Calcium spraying -- Wet mechanical properties -- Water resistance; Hydrocolloids -- Periodicals; Food additives -- Periodicals; Colloïdes -- Périodiques; Aliments -- Additifs -- Périodiques; Colloids; Food additives; Periodicals; Electronic journals; 664.06
• DOI: 10.1016/j.foodhyd.2021.107340
• Languages: English
• ISSNs: 0268-005X

Abstract

Abstract: Two spray processes for adding calcium were designed to improve the mechanical properties of collagen fiber films in wet conditions. The processes were applied after immersion of the films in sodium alginate (SA) and glycerol solution. One process (P1) involved spraying after immersion but before but before the film had dried the film and the other process (P2) involved spraying after drying the film. Both processes significantly improved the wet mechanical properties of the films. However, P1 mainly enhanced the elasticity and stiffness, whereas P2 mainly enhanced the toughness. Ca-alginate complexes gradually formed in the samples after the addition of Ca 2+, improving the water resistance of the samples. For the samples prepared using P1, Ca 2+ penetrated inside the film and chelated SA and collagens to form a dense network, but further damaged the triple helix structures of collagens. For the samples prepared using P2, the sprayed calcium ions generated a protective layer of calcium alginate on the surface of the membrane and the secondary structure of the collagen was better maintained. Graphical abstract: Image 1 Highlights: Alginate immersed samples were sprayed by Ca 2+ before (P1) or after (P2) dried. Ca 2+ sprayed samples showed excellent mechanical properties at wet conditions. Ca 2+ coordinated with alginate to form Ca-alginate complexes. P1 samples formed a compact and stiff network with destruction for collagens. P2 samples formed a protective layer and collagens were better maintained.