The Functional and Application Possibilities of Starch/Chitosan Polymer Composites Modified by Graphene Oxide.

This study describes functional properties of bionanocomposites consisting of starch/chitosan/graphene oxide (GO) obtained using the green synthesis method, such as water-barrier and optical properties, as well as the rate of degradation by enzymatic and acid hydrolysis. The toxicity of the composites and their effects on the development of pathogenic microflora during storage of meat food products was also investigated. Although the results showed that the barrier properties of the composites were weak, they were similar to those of biological systems.

Study of cellulolytic enzyme immobilization on copolymers of N-vinylformamide.

This study was focused on finding of effective carriers suitable for the immobilization of cellulase. Copolymers of N-vinylformamide (NFV) and divinylbenzene (DVB) were synthesized by free radical crosslinking polymerization in inverse suspension. Methyl silicone oil was used as the continuous phase.

Stimulation of glucose oxidase with white linearly polarized light.

Glucose oxidase (GOD) was illuminated with white linearly polarized light (WLPL). The enzyme was illuminated at room temperature in separate vessels then admixed to a reactor filled with D-glucose. The illumination of the enzyme for 60 min at 25-30 degrees C and pH 6.

Formation of cyclodextrins with cyclodextrin glucosyltransferase stimulated with polarized light.

After illumination with white, linearly polarized light (WLPL), cyclodextrin glycosyltransferase produced mixture of alpha-, beta-, and gamma-cyclodextrins (CD) with higher overall yield than did that enzyme when nonilluminated. The illumination also influenced the ratio of those CD and that effect depended on concentration of enzyme and illumination time. At a high enzyme concentration (0.

Polarized light-stimulated enzymatic hydrolysis of chitin and chitosan.

Illumination with white linearly polarized light (WLPL) stimulated chitinase and chitosanase in their degradation of chitin and chitosan, respectively. Enzymes were illuminated at room temperature in separate vessels, then admixed in reactors containing polysaccharides. Hydrolysis of chitosan to glucosamine followed first order kinetics whereas hydrolysis of chitin to N-acetylglucosamine deviated from the first order kinetics.