Investigation of the Antioxidant Properties of the Quaternized Chitosan Modified with a Gallic Acid Residue Using Peroxidase that Produces Reactive Oxygen Species

Biochemistry (Moscow) - Chitosan modified with a (2-hydroxy-3-trimethylammonium) propyl group and gallic acid residue, or quaternized chitosan with gallic acid (QCG), was synthesized. Antioxidant...     

Antioxidant,Antimicrobial, and Fungicidal Properties of Chitosan Based Films (Review)

Data on the effect of biologically active compounds introduced into chitosan-based films (polyphenols, natural extracts from plants and proteins and peptides) on their antimicrobial, antioxidant and fungicidal activity are summarized and analyzed. It was shown that composite films reveal higher antimicrobial activity than films containing only chitosan, and they also retain their mechanical and protective properties.     

Antifungal action of chitosan in combination with fungicides in vitro and chitosan conjugate with gallic acid on tomatoes against Botrytis cinerea

In the present work, a positive effect was obtained by using low molecular weight chitosan compounds in combination with synthetic fungicides. Antifungal activity against Botrytis cinerea, determined by the radial growth method, was more than 75%, with a 25?×?10^??10 g/L concentration of fludioxonil or difenoconazole in compounds. Metabolic activity of B. cinerea fungus was about 15% when using a chitosan compound containing fludioxonil at a concentration of 25?×?10^??7 g/L. The combined action of chitosan with difenoconazole at a fungicide concentration of 25?×?10^??4 g/L is 2–3 times more effective than the action of each component separately. Results of studies for artificially inoculated B. cinerea tomato fruit when treated with low molecular chitosan and chitosan conjugate with gallic acid reduced the frequency of rotting fruit by 50 and 83%, respectively. Chitosan-gallic acid conjugate were obtained from chitosans with Mw of 28 kDa (Ch28GA) was proved to be effective as a preventive treatment for 3 days and can potentially be used as a biofungicide against B. cinerea on tomatoes in the post-harvest period.

     

Obtaining of Metal Nanoparticles Using Reducing Agents and Chitosan

Applied Biochemistry and Microbiology - Unique features of metal nanoparticles (NPs) are attracting the attention of researchers from various fields of science, including biomedicine, microbiology,...     

Thromboresistance of Polyurethane Plates Modified with Quaternized Chitosan and Heparin

Applied Biochemistry and Microbiology - To obtain modified polyurethane (PU) plates, quaternized chitosan (QuatCh; degree of substitution 50%, degree of deacetylation 87%) and unfractionated...