Ernesto Oyervides-Muñoz

Autonomous University of Coahuila | UAdeC · Chemical Engineering

Biopolymers are molecules widely used in many industries because they are biodegradable and have a natural origin. Therefore, they can be obtained from renewable resources and organisms such as animals, plants, or microorganisms. Among the best-known biopolymers, xanthan gum is an anionic biopolymer composed of glucose, mannose, glucuronic acid, py...

A new starch derivative with antibacterial properties and non‐hemolytic effect was synthesized through the chemical grafting of 4‐chloroaniline onto the backbone of potato starch. In a first step, starch was extracted from potatoes grown in the region of Coahuila, Mexico, using the water steeping method. The hydroxyl groups (C5‐C6) of the native st...

Activated carbon fibers (ACFs) were synthesized using a straightforward two-step process from dryer lint microfibers in a self-generated atmosphere. During pyrolysis and activation, a CO/CO2 environment was created based on the Boudouard equilibrium. The resulting ACFs showed a high specific surface area (1720 m2/g), a suitable pore size distributi...

Diabetic foot ulcers are a serious complication of uncontrolled diabetes, emphasizing the need to develop wound healing strategies that are not only effective but also bio-compatible, biodegradable, and safe. We aimed to create biomatrices composed of semi-interpenetrated polymer networks of collagen, polyurethane, and dextran, to enhance the wound...

Chitin is a bio-based and biodegradable polymer since it is the second most abundant natural polysaccharide on earth after cellulose. It is composed of N-acetyl-d-glucosamine, and it is found in different organisms such as in the exoskeleton of crustacean, insects, annelids, mollusks, plants, and some microorganisms. On the other hand, Chitosan is...

Three novel polyaspartate derivatives with antibacterial properties and low hemolytic effects are synthesized by the reaction of sodium polyaspartate (PAspNa) with different quaternary ammonium salts with a carboxylic end‐group, subsequently these are tested in vitro against different cancer and normal cell lines. 1‐(carboxypentyl) pyridinium bromi...

Three novel starch derivatives with antibacterial properties are synthesized through a rather simple multistep synthesis route. In a first step, sodium periodate oxidation of the hydroxyl groups (C2 – C3) of starch yields a di‐aldehyde structure, which is used to attach N, N‐dimethylbenzylamine by Schiff base formation. Then, the amino groups of am...

Zinc oxide‐polypyrrole composites (ZnO‐PPY) are novel materials that have attracted significant attention in recent years. These materials have the potential to remove hazardous pollutants from water effectively. Here, we explore facile synthesis, characterization, and adsorption capacity of hexavalent chromium anions, by nano‐ZnO and nano‐ZnO‐PPY...

This work presents the influence of functionalized multi-walled carbon nanotubes (MWCNTs) with different diameter on the electrochromic performance of compact NiO films deposited by electrostatic spraying. MWCNTs did not noticeable modify the structure and morphology of NiO films, although they tended to adsorb larger amounts of OH and O. Spectroel...

Two novel polysuccinimide (PSI) derivatives with antibacterial properties were synthesized by the reaction of polysuccinimide with different quaternary ammonium salts with an active terminal group. 4-bromobutyl-quinolinium bromide and 4-bromobutyl-benzalkonium bromide were synthesized from a quaternization reaction between 1,4-dibromobutane and a t...

The present study provides antibacterial and thermal improvements of chitosan‐based systems through chemical modification with different quaternary ammonium salts using 1‐ethyl‐3‐(3‐dimethylaminopropyl) carbodiimide (EDC) as mediator. Three different ammonium salts with a carboxylic acid end group are synthesized through a quaternization reaction b...

Functionalized high molar mass chitosan derivatives with increased antibacterial properties were prepared by the reaction of chitosan with different quaternary ammonium salts. Benzalkonium bromide, pyridinium bromide and triethyl ammonium bromide were synthesized by a quaternization reaction between 1,4-dibromobutane and the respective tertiary ami...