期刊
FOOD HYDROCOLLOIDS
卷 124, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2021.107270
关键词
Collagen film; Collagen fiber; Glutaraldehyde; Cross-linking; pH; Physicochemical properties
资金
- National Natural Science Foundation of China [31871846, 31801589]
- Natural Science Foundation of Jiangsu Province [BK20180615]
- Fundamental Research Funds for the Central Universities [JUSRP12005]
- 111 project [B07029]
- national first-class discipline program of Food Science and Technology [JUFSTR20180204]
- program of Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, China
Collagen films cross-linked with glutaraldehyde at different pH values demonstrated varying physicochemical properties, with optimal cross-linking degree achieved under neutral and alkaline conditions. pH influenced the reaction position and degree, resulting in improved mechanical properties and thermal stability in the cross-linked films compared to non-cross-linked films. Control of reaction pH can be utilized to modulate the collagen films' properties for specific applications.
Collagen films cross-linked with glutaraldehyde (GTA) at different pH values were prepared to explore the in-fluence of pH on their physicochemical properties. The films were characterized using FTIR spectroscopy, XRD analysis, SDS-PAGE, shrinkage temperature, fluorescence analysis and SEM. The results indicated that cross-linking degree and reaction position were different at different pH values. The optimal cross-linking degree in collagen films was obtained under neutral and alkaline conditions. The main reaction under acidic conditions was intramolecular cross-linking and this gradually shifted to intermolecular cross-linking with an increase in pH. Cross-linked films had improved mechanical properties and thermal stability as well as higher b* values compared to films without cross-linking. These improvements correlated with the degree and position of cross-linking reactions. Controlling the reaction pH can be used to modulate the physicochemical properties of the collagen films to match specific application requirements.
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