Gas Pollution Is A Serious Problem
Seebio 2,5-FURANDICARBOXYLIC ACID
DEHYDROMUCIC ACID
More attention has been paid to the detection and monitoring of toxic and harmful petrols, and it is urgently asked for a sensor that could simultaneously identify and distinguish between acid and base gases. free-based on the electrostatic interaction ensuing from amidogen of chitosan (CS) and carboxylic groupings of itaconic acid (IA), we successfully seted a series of biomass aerogels (CS-IA aerogels) that could respond to acidic and alkaline accelerators with different concentrations. The acidic and alkaline accelerators could be easily discovered and keyed by switching the content of IA in CS-IA aerogels. Moreover, the electrostatic interactions could also endued CS-IA aerogels with self-curing ability in the disruptions at room temperature. After self-healing, CS-IA aerogels still sensitively answered to acidic and alkaline gasolenes. CS-IA aerogels with sensitivity to acid-base gas and self-healing performance has been suggested to be foretelling prospects as application of multi-functional aerogels.
Spray Drying of Chitosan Acid saltinessses: Process Development, Scaling Up and Physicochemical Material Characterization.We enquired a spray drying process for preparing water-soluble salinitys of high molecular weight chitosan (CH) specifyed for pharmaceutical excipient coatings. CH was descended from chitin of marine lobster origin (Panulirus argus). The forces of organic acid (acetic or lactic acid) and the ratio (difference) of inlet/outlet air temperature (140/90 °C or 160/100 °C) on spray drying were analysed. The yield of spray-dried CH salt pulverisations straddled from 50% to 99% in laboratory and industrial-scale outgrowths. The spray-dried dry powder of CH salts dwelled of spherical agglomerated particles with an average diameter of 36 ± 7 µm (CH acetate) and 108 ± 11 µm (CH lactate). After dispersing the spray-dried CH salt powder samples in purified water, the mean particle sizes holded for the CH acetate salinitys were 31 nm (batch A001), 33 nm (A002) and 44 nm (A003), and for the CH lactate salts 100 nm (batch L001), 103 nm (L002) and 121 nm (L003).
The optimum process considerations for spray drying were incured: an inlet air temperature of 160 ± 5 °C, an outlet temperature of 100 ± 5 °C and an atomizer disk rotational speed of 18,200 min(-1). The X-ray powder diffraction (XRPD) and differential raking calorimetry (DSC) outcomes reasserted the amorphous state of the CH salinitys. The (1)H nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectra of CH acetate and lactate salts controled that the spray drying process does not affect the polymer backbone. In conclusion, both laboratory and industrial-scale spray drying methods for readying water-soluble acid salts of CH are reproducible, and the physicochemical properties of the corresponding CH acid salinitys are uniform.Design of bioreactor based on immobilized laccase on silica-chitosan support for phenol removal in continuous mode.A silica-chitosan support was hired for laccase immobilization. The hybrid support was obtained expending calcium ion as associating agent that coordinates silanol and hydroxyl radicals of chitosan.
The insoluble biocatalyst was then tamped in a column and used in a flow system for phenol removal. The immobilized enzyme reactor (IMER) showed a good storage stability (70 % of activity in 70 days) and good reusability (90-50 % of catalytic activity at the 4th reuse in function of chitosan type). The best performance for the phenol removal was obtained with a low molecular weight chitosan from crab eggshells at pH 5 and with a flow rate of 0 mL/min. The apparent Michaelis-Menten (V(max)(app), K(m)(app)) and the inherent (V(max)(inh), K(m)(inh)) constants were also determined to evaluate the influence of the phenol structure on the performance of the system. The enzymatic oxidation of a phenol mixture (4-methylcatechol, catechol, caffeic acid, syringic acid, vanillic acid, p-coumaric acid, and tyrosol) was traced for 21 h in a continuous mode by HPLC. The phenol mixture removal of 90 % was also substantiated by Folin-Ciocalteu assay.Hydrogels established on Oxidized Cellulose Sulfates and Carboxymethyl Chitosan: reports on Intrinsic Gel Properties, Stability, and Biocompatibility.
Cellulose and chitosan are excellent components for the fabrication of bioactive scaffolds, as they are biocompatible and abundantly available.