Journal
FOOD HYDROCOLLOIDS
Volume 24, Issue 4, Pages 285-290Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2009.10.003
Keywords
Sweet potato starch; Film; Antimicrobial activity; Physical properties
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Funding
- Chongqing Science & Technology Commission (CSTC) [2009CB1001]
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Antimicrobial biodegradable films have been prepared with sweet potato starch by incorporating potassium sorbate or chitosan. Films incorporated with potassium sorbate >= 15% or chitosan >= 5% were found to have an anti-Escherichia coli effect. Staphylococcus aureus could be effectively suppressed by incorporation of chitosan at >= 10%. Whereas potassium sorbate lowers the tensile strength and elongation at break, and raises the oxygen permeability, water vapor permeability and water solubility, chitosan has the opposite effect. Fourier Transform Infrared (FT-IR) spectra analysis revealed that starch crystallinity was retarded by potassium sorbate incorporation and that hydrogen bonds were formed between chitosan and starch. This explained the modification of the mechanical and physical properties of the films by the incorporation of these two antimicrobial agents. (C) 2009 Elsevier Ltd. All rights reserved.
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