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Preparation and characterization of antifungal coating films composed of sodium alginate and cyclolipopeptides produced by Bacillus subtilis.

Authors :
Xu, Linlin
Zhang, Bo
Qin, Yuhan
Li, Feiyang
Yang, Shujuan
Lu, Pengpeng
Wang, Lan
Fan, Junfeng
Source :
International Journal of Biological Macromolecules. Jan2020, Vol. 143, p602-609. 8p.
Publication Year :
2020

Abstract

We report the inclusion of cyclolipopeptides (CL) from Bacillus subtilis in the production of an easily removed alginate coating for the preservation of vulnerable berries. The sodium alginate-CL (SA-CL) coating films exhibited potent antifungal and freshness-maintaining properties during the storage of blueberries, the 3% CL-added film decreased total fungal count to 2.5 × 103 cfu/g at the end of the storage. The SA-CL films had poor mechanical properties (i.e., tensile strength and elongation at break), low water vapor permeability and high water solubility. The addition of CL (3%) decreased the tensile strength and elongation at break of the SA-CL film to 0.37 mPa and 2.57%, respectively, and increased the water solubility to 28.92%. But the water vapor permeability of the 3% film was lowered to 398.10 g/m2/day. These results implied the film was suitable for the coating of vulnerable berries. Further research revealed that ionic and hydrogen bonding interactions between CL and alginate stabilized the network of the coating film while the fatty acid moiety weakened the strength and crystallinity and restricted the water transfer of the coating film. Our findings provide an effective route to an easily washed alginate coating film through inclusion of amphiphilic antifungal substances. • Cyclolipopeptides is added to alginate to make easily-cleaned active coating film. • The coating film suppresses fungal growth on blueberry and maintains its quality. • The coating film has weak mechanical strength and high water solubility. • Addition of cyclolipopeptides improves the water barrier capacity of film. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
01418130
Volume :
143
Database :
Academic Search Index
Journal :
International Journal of Biological Macromolecules
Publication Type :
Academic Journal
Accession number :
141169946
Full Text :
https://doi.org/10.1016/j.ijbiomac.2019.12.051