Films of chitosan and chitosan-oligosaccharide neutralized and thermally treated: Effects on its antibacterial and other activities

Abstract

Films of chitosan and chitosan-oligosaccharide neutralized and thermally treated: Effects on its antibacterial and other activities, LWT -Food Science and Technology (2016), doi: 10.1016/j.lwt.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT ABSTRACT: 16The present study focuses on the effects of heat and neutralization treatments on 17 solubility, water vapour permeability and antimicrobial activity of chitosan (Ch) and 18 chitosan/chitooligosaccharide (ChO)-based films. ChO films showed stronger 19 antimicrobial activity against Escherichia coli, Bacillus cereus, Staphylococcus aureus, 20 Serratia liquefaciens and Lactobacillus plantarum than Ch films, indicating that this 21effect is attributed to the presence of chitooligosaccharides (COS) in the films. Heat 22 and neutralization treatments decreased significantly the solubility of chitosan films and 23 gave rise to a sharp loss in their antimicrobial activity. The incorporation of COS in 24 chitosan films increased the inhibitory effect against the studied microorganisms 25 without affecting significantly the water vapour permeability of the films. Thus, it is 26 possible to get a more insoluble chitosan film with high antimicrobial activity by means 27 of incorporation of COS combined with heat or neutralization treatments.

Chitosan/Cellulose Nanofibril Nanocomposite and Its Effect on Quality of Coated Strawberries

“…It is the second most abundant polysaccharide in nature and has the capacity to form lms with proven antimicrobial properties [6].…”

Spectroscopic Characterization of Copper-Chitosan Nanoantimicrobials Prepared by Laser Ablation Synthesis in Aqueous Solutions

“…In the field of antimicrobial nanomaterials (nanoantimicrobials (NAMs)), LASiS methods have been recently employed to the preparation of technologically-relevant nanocolloids, which have been applied as active additives in food packaging [ 7 , 8 ], biosensing and diagnostics [ 4 , 9 ], catalysis [ 10 ], optoelectronics [ 11 ], and so on. Chitosan (CS), or poly-β-(1-4)-2-amino-2-deoxy- d -glucose, is a poly-aminosaccharidic cationic polymer, produced by the N -deacetylation of chitin, which is frequently used as an antibacterial agent, as well [ 12 , 13 , 14 , 15 , 16 , 17 ]. After cellulose, CS is the second most abundant polysaccharide on Earth; it is inexpensive and biocompatible [ 18 ].…”

Heterogeneous method of chitosan film preparation: Effect of multifunctional acid on film properties

“…Therefore, even if the thickness of neutralized films matched that of neat films, their WVP values would likely exceed the average value of 10.70 × 10 −11 g (m −1 ·s −1 ·Pa −1 ). Increase in WVP of chitosan films after neutralization has previously been reported, whether neutralized with a similar procedure as the one used here, or by spraying the film with NaOH …”