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Using carboxylated cellulose nanofibers to enhance mechanical and barrier properties of collagen fiber film by electrostatic interaction
Author(s) -
Wang Wenhang,
Zhang Xiuling,
Li Cong,
Du Guanhua,
Zhang Hongjie,
Ni Yonghao
Publication year - 2018
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8809
Subject(s) - nanofiber , fiber , ultimate tensile strength , cellulose , materials science , chemical engineering , zeta potential , composite material , cationic polymerization , scanning electron microscope , swelling , elongation , polymer chemistry , nanotechnology , nanoparticle , engineering
Abstract BACKGROUND Collagen‐based films including casings with a promising application in meat industry are still needed to improve its inferior performance. In the present study, the reinforcement of carboxylated cellulose nanofibers (CNF) for collagen film, based on inter‐/intra‐ molecular electrostatic interaction between cationic acid‐swollen collagen fiber and anionic carboxylated CNF, was investigated. RESULTS Adding CNF decreased the zeta‐potential but increased particle size of collagen fiber suspension, with little effect on pH. Furthermore, CNF addition led to a higher tensile strength but a lower elongation, and the water vapor and oxygen barrier properties were improved remarkably. Because the CNF content was 50 g kg –1 or lower, the films had a homogeneous interwoven network, and CNF homogeneously embedded into collagen fiber matrix according to the scanning electron microscopy and atomic force microscopy analysis. Additionally, CNF addition increased film thickness and opacity, as well as swelling rate. CONCLUSION The incorporation of CNF endows collagen fiber films good mechanical and barrier properties over a proper concentration range (≤ 50 g kg –1 collagen fiber), which is closely associated with electrostatic reaction of collagen fiber and CNF and, subsequently, the form of the homogenous, compatible spatial network, indicating a potential applications of CNF in collagenous protein films, such as edible casings. © 2017 Society of Chemical Industry