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Start Over Journal carbohydrate research Publisher elsevier bv
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1. Antimicrobial, microscopic and spectroscopic properties of cellulose paper coated with chitosan sol-gel solution formulated by epsilon-poly-l-lysine and its application in active food packaging

Author

Roghayieh Razavi, Hossein Tajik, Mehran Moradi, Parya Ezati, and Rahim Molaei

Subjects
Paper, Surface Properties, Lysine, Active packaging, Microbial Sensitivity Tests, 010402 general chemistry, medicine.disease_cause, 01 natural sciences, Biochemistry, Analytical Chemistry, Chitosan, chemistry.chemical_compound, Listeria monocytogenes, Carbohydrate Conformation, medicine, Polylysine, Particle Size, Fourier transform infrared spectroscopy, Cellulose, 010405 organic chemistry, Chemistry, Organic Chemistry, Food Packaging, General Medicine, Antimicrobial, Anti-Bacterial Agents, 0104 chemical sciences, Solutions, Food packaging, Gels, Nuclear chemistry
Abstract

Cellulose paper-chitosan (CC) double-layer films containing epsilon-poly-l-lysine (e-PL) (0.5 and 1% w/v) were developed. FTIR analysis showed a strong association between the e-PL and CC film. Antimicrobial activity against Listeria monocytogenes was investigated both in vitro and in the chicken breast meat. The CC films without e-PL showed no antimicrobial activity, while the addition of e-PL induced significant (p 0.05). This study revealed an antimicrobial activity for CC films impregnated with e-PL, to control foodborne pathogens in meat.

Published
2020

2. Hydrophobication and characterisation of O-acetyl-galactoglucomannan for papermaking and barrier applications

Author

Victor Kisonen, Jarl Hemming, Rainer Sjöholm, Vladimir Aseyev, Markku Auer, Patrik Eklund, Anna Sundberg, Andrey Pranovich, and Stefan Willför

Subjects
Paper, Color, 02 engineering and technology, Benzoates, 01 natural sciences, Biochemistry, Benzoic anhydride, Analytical Chemistry, Mannans, chemistry.chemical_compound, Pyridine, Transition Temperature, Organic chemistry, Hemicellulose, Galactoglucomannan, Molar mass, 010405 organic chemistry, Organic Chemistry, Chemical modification, General Medicine, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Molecular Weight, Butyrates, Solubility, chemistry, Reagent, Solvents, Dimethylformamide, 0210 nano-technology, Hydrophobic and Hydrophilic Interactions
Abstract

Norway spruce O-acetyl-galactoglucomannans (GGM) are water-soluble hemicelluloses that have potential to be produced in large scale as a side product of the mechanical pulping industry or by hot-water extraction of wood. Chemical modification is often needed to tailor such water-soluble polysaccharides into industrially valuable compounds. In this work, treatment of GGM with butyric and benzoic anhydride in pyridine/dimethylformamide rendered GGM derivatives, which were hydrophobic and partially soluble in organic solvents. The degree of substitution can be adjusted by varying the quantity of the reagent and reaction temperature. The dn/dc value for the benzoyl ester of GGM was determined in 0.05 M LiBr DMSO in order to obtain accurate molar mass analysis with SEC-MALLS-RI. Novel substances with adjusted hydrophobicity can thus be prepared on one step synthesis from natural hemicelluloses, which then showed a slight increase in the molar mass upon esterification.

Published
2012