The Study Purposed To Investigate The Antibacterial Effect And Mechanism Of Chitosan-Grafted-Phenolic Acid Copolymers On Shewanella Putrefaciens (S

Furane-alpha
2, 5-Furandicarboxylic acid

putrefaciens). CS-transplanted-protocatechuic acid (CS-g-PA) and CS-engrafted-gallic acid (CS-g-GA) were maked by EDC/NHS coupling reaction. The antibacterial trials indicated that CS-g-PA and CS-g-GA had the same minimum inhibitory concentration (MIC) (1 mg/mL) and minimum bactericidal concentration (MBC) (5 mg/mL) against S. putrefaciens. agring to the change trend of growth curve, the growth of S. putrefaciens was significantly keeped under 2MIC graft copolymers (P < 0).

Moreover, the increment of alkaline phosphatase (AKPase) activity and electrical conductivity proved that the cell wall and membrane permeability of S. putrefaciens were damaged respectively. In addition, the increase of lactate dehydrogenase (LDHase) activity, protein and nucleic acid absorbance and the decrease of adenosine triphosphatase (ATPase) activity intimated that the cell membrane was incomplete and poor fluidity. The irregular shape of bacteriums and the outflow of intercellular contentednessses were also noticed from scanning electron microscope (SEM). The above results manifested a great potential of CS-g-PA and CS-g-GA for use as food preservatives to aquatic merchandises.Influence of chitin nanofibrils ultrasonic treatment on structure and properties of chitosan-based composite stuffs.The influence of ultrasonic treatment parameters of chitin nanofibrils aqueous suspension on structure, strength and deformation dimensions of chitosan-established composite cinemas and fibres was investigated.

Model calculations of ultrasound-haved cavitation parameters in the aqueous suspension of the chitin nanofibrils testifyed that an increase in the field power up to 630 W led to destruction of the cavity, to an increase in the temperature in the vicinity of cavitation area (up to 507 °C) and, as a consequence, to destruction of chitin glycoside ring (which is sustained by the IR data). The results of light scattering, IR spectroscopy, and electron microscopy probes pointed that the optimal duration of ultrasonic treatment of the chitin nanofibrils aqueous solution was 4-10 min (depending on orientated state of the scaffold). Tensile strength of the complexs was 130 ± 11 MPa (pics), 226 ± 4 MPa (fibers); deformation at break was 43 ± 7% (celluloids), 10 ± 0% (fibers).Adsorption for rhodamine b dye and biological activity of nano-porous chitosan from shrimp casings.The present work aims to evaluate the removal capacity of Rhodamine B dye (RhB) habituating nano-porous chitosan (NC) from shrimp eggshells. NC was characterized by XRD, SEM-EDS, N(2) porosimetry, zeta potential (ZP), FTIR, DLS, and zero charge point (pH(ZCP)). Compound central rotational design (CCRD) was used to determine the ideal condition and antimicrobial activity was appraised against different songs.

NC showed characteristic of semi-crystalline material with negative charge surface (around - 21 mV), and S(BET) = 1 m(2) g(-1), Vp = 0 cm(3) g(-1), Dp = 32 nm and pH(ZCP) ≈ 7. Kinetic adsorption registered the pseudo first-order model had the best fit, with adsorption capacity (q(1)) between 3 and 64 mg g(-1) and pseudo first-order kinetic constant (k(1)) between 0 and 0 min(-1). Sips model best identifyed the equilibrium data, with a maximum adsorption capacity of 505 mg g(-1). Antimicrobial activity was followed at 0 mg mL(-1) for different melodys NC has potential application in the removal of the dye, commingling sustainable development associated with nanotechnology.Pure Chitosan-Based Fibers constructed by a Wet Spinning Lab-Scale Process Using Ionic Liquids.Ionic liquidnessses offer alternative methods for the sustainable processing of natural biopolymers like chitosan. The ionic liquid 1-butyl-3-methylimidazolium acetate (BmimOAc) was successfully used for manufacturing of pure chitosan-established monofilaments by a wet spinning process at lab-scale.

Commercial chitosan with 90% deacetylation degree was used for the preparation of reeling skunks with solids content of 4-8 wt.%. Rheology trials were carried out for the characterization of the viscometric attributes. BmimOAc was used as a solvent and deionized water as coagulation and washing medium.