Catalase enzyme from red poppy (Papaver rhoeas) plant was immobilized covalently with glutaraldehyde onto chitosan particles. The changes in the kinetic properties of the immobilized and free red poppy catalase were determined. The Km values were found to be 26 and 33 mM for free and immobilized red poppy catalase on chitosan. Furthermore, various characteristics of free and immobilized red pop...

BACKGROUND The bacterium Acetobacter sp. CCTCC M209061 is a promising whole-cell biocatalyst with exclusive anti-Prelog stereoselectivity for the reduction of prochiral ketones that can be used to make valuable chiral alcohols such as (R)-4-(trimethylsilyl)-3-butyn-2-ol. Although it has promising catalytic properties, its stability and reusability are relatively poor compared to other biocataly...

Appropriately disposing of and reusing waste is a major step in promoting environmentally sustainable development. Following the rise environmental awareness, agricultural has been applied as reusable organic resource cost-efficient material for preparing hydrogel adsorbents. The present study combined rice bran with sodium alginate chitosan to prepare two new types beads. beads were then modif...

Highly toxic nickel is released into the environment from a number of industrial processes, but current techniques for its removal are expensive and may cause secondary pollution. We developed a biosorbent of chitosan-immobilized brown algae (Laminaria japonica). The effects of different parameters on the adsorption capacity and biosorption-desorption of Ni from aqueous solution were evaluated....

The removal of the azo dyes Orange II (OII) and Reactive Black 5 (RB5) from aqueous solutions was studied using three types adsorbents derived chitosan: unmodified chitosan beads (un-Ch), tuned with a deep eutectic solvent (DES) composed choline chloride:urea at 1:2 molar ratio (Ch-DES), along FeO nanoparticles added to modified DES (Ch-FeO-DES). Both were effectively removed in 3–4 h when Ch-D...

The paper presents the synthesis of hydrogels via free-radical polymerization, based on Chitosan (CS) grafted with Acrylic acid (AA), using a two-step procedure. Free-radical polymerization has given strong compact structure, dominant elastic behavior, and long linear viscoelastic region. results rheological studies have shown that obtained significantly improved mechanical properties in compar...

This study aims to characterize and evaluate polyethylene oxide (PEO) chitosan (CS) nanofibers produced by electrospinning method. Electrospinning solutions were used at three different concentrations (1, 2, 3 wt%) with five PEO/CS mixing ratios (30/70, 40/60, 50/50, 60/40, 100/0). FESEM, XRD FTIR tests applied for characterization of the nanofibers. Antibacterial activity against Staphylococcu...

Floating calcium alginate beads based on gas-generation technique often suffer from poor drug encapsulation and rapid drug release in the acidic environment of the stomach. To overcome the above mentioned demerits, in the present study we have evaluated the influence of formulation factors such as incorporation of mixtures of gasgenerating agents (NaHCO3 and CaCO3), incorporation of gelatin typ...

Polycyclic aromatic hydrocarbons (PAHs) are classified as hazardous pollutants in the environment due to their toxic, mutagenic and recalcitrant nature. Compared to other methods, biodegradation using microorganisms seems to be attractive alternative for treating PAH contaminated environment. However, there are limitations because of its low aqueous solubility and negligible bioavailability to ...