The saponification value of fats and oils is one the most common quality indices, reflecting mean molecular weight constituting triacylglycerols. Proton nuclear magnetic resonance (1H-NMR) spectra display specific resonances for protons from structural patterns triacylglycerols (i.e., glycerol backbone), methylene (-CH2-) groups, double bonds (-CH=CH-) terminal methyl (-CH3) group three fatty acyl chains. Consequently, chemometric equations based on integral values 1H-NMR allow calculation...

The purpose of the present study is to develop new multifunctional environmentally friendly materials having applications both in medical and food packaging fields. New poly(lactic acid) (PLA)-based containing additives derived from natural resources like chitosan (CS) rosemary extract (R) were obtained by melt mixing. Each selected components has its own specific properties such as: PLA a biodegradable thermoplastic aliphatic polyester renewable biomass, heat-resistant, with mechanical...

Abstract Hydrogels consisting of sodium alginate and N ‐isopropylacrylamide covalently crosslinked with , ′‐methylenebisacrylamide were prepared. The mixed‐interpenetrated networks obtained characterized using elemental analysis, Fourier transform infrared Raman spectroscopy, swelling measurements environmental scanning electron microscopy. thermo‐ pH‐responsive properties these hydrogels evidenced by their behaviour, which depended also on the amount crosslinking agent hydrogel composition....

Several recipes based on PLA, bio-plasticizers, and active agents such as vitamin E cold-pressed rosehip seed oil encapsulated into chitosan by the emulsion method named here modified (CS-M) were elaborated melt compounding for food packaging applications. Resulted biocomposites have been investigated from point of view physical-mechanical, thermal, barrier, antimicrobial, antioxidant properties to select formulations with optimum features produce trays films The obtained results showed that...

New multifunctional materials containing additives derived from natural resources as powdered rosemary ethanolic extract were obtained by melt mixing and processed in good conditions without degradation loss of additives. Incorporation (R) into poly(lactic acid) (PLA) improved elongation at break, rheological properties, antibacterial antioxidant activities, addition to the biocompatibility. The accordance between results chemiluminescence method radical scavenging activity determination...

The purpose of the study is to obtain multicomponent polyelectrolyte hydrogels with optimal synergistic properties by combining a modified starch synthetic one. Thus, new low-cost and biocompatible semi-interpenetrating polymer network (semi-IPN) carboxymethyl poly(2-dimethylaminoethyl methacrylate) are prepared investigated. synthesized studied respect specific characteristics gels: swelling kinetics, thermal analysis, viscoelastic characteristics, their ability be used as matrix in drug...

Hydrogel conjugates based on chitosan and an essential oil were synthetized by ultrasound-assisted emulsification approach. Rheology studies revealed a gel-type structure with pronounced compactness flexibility while SEM showed the formation of two-level ordered network highly interconnected pores. The swelling indicated pH-dependent behavior significant overshooting effect. synergistic effects components in clove led to strong antioxidant character enhanced antimicrobial activity conjugate...

The development of advanced formulations used for food packaging applications, which behave as protection or preservation materials and improve consumers' health offers a route to reduced wastage. present study deals with investigations on the possibility obtaining functionalized coatings by electrospinning poly(ɛ-caprolactone), synthetic biodegradable polymer together vitamin E (α-tocopherol), selected plant-based phenolic antioxidant. In this approach allows production high surface area...

Antioxidant activity is an important feature for food contact materials such as packaging, aiming to preserve freshness and retard spoilage. Common bioactive agents are highly susceptible various forms of degradation; therefore, protection required maintain functionality bioavailability. Poly(ε-caprolactone) (PCL), a biodegradable GRAS labeled polymer, was used in this study encapsulation α-tocopherol antioxidant, major component vitamin E, the form electrospun fibers. Rheological properties...

ABSTRACT Mixed‐interpenetrated polymeric networks based on sodium alginate (ALG) and poly( N ‐isopropylacryl amide) (PNIPAAm) covalently cross‐linked with N,N' ‐methylenebisacrylamide are studied for their biocompatibility, nontoxicity, biodegradability aiming application in drug delivery. The presence of drug‐polymeric matrix interactions the distribution network theophylline‐loaded ALG/PNIPAAm hydrogels also investigated by spectroscopic microscopic methods. quantitative evaluation...

Abstract Interpenetrating polymeric networks based on sodium alginate and poly( N ‐isopropylacrylamide) (PNIPAAm) covalently crosslinked with , ′‐methylenebisacrylamide have been investigated using rheology, thermogravimetry, differential scanning calorimetry, X‐ray diffraction measurements electron microscopy (SEM). An improved elastic response of the samples a higher PNIPAAm content increased amount crosslinking agent was found. The temperature‐responsive behaviour hydrogel evidenced by...

In the present study polyelectrolyte complexes (PECs) based on new sulfadiazine-chitosan conjugates with sodium hyaluronate have been developed potential use in treatment of burn wounds. The PECs were chemically characterized using Fourier Transform—Infrared Spectroscopy, Scanning Electon Microscopy and Near Infrared Chemical Imaging Technique. swelling behavior vitro sulfadiazine release also investigated. antimicrobial activity was evaluated towards three bacterial strains: Escherichia...

Chitosan (CH) nanofibrous structures containing sulfadiazine (SDZ) or modified chitosan (SCH) in the form of functional nanoparticles attached to nanofibers (hybrid nanostructures) were obtained by mono-axial and coaxial electrospinning. The design consisted a SDZ/CH mixture solution fed through single nozzle while SCH CH solutions separately supplied inner outer (or reverse order). ability assured formation nanofiber mesh, SDZ SCH, both suspensions electrospun solution, active which...

The irradiation of polymeric materials with ionizing radiation (γ-rays, X-rays, accelerated electrons, ion beams, etc.) may lead to disproportion, hydrogen abstraction, arrangements, degradation, and/or the formation new bonds. purpose this paper is evaluate effect gamma on some poly(lactic acid) (PLA)-based blends and biocomposites, which crucial when they are used for food packaging or medical purposes. biocomposites based PLA rosemary ethanolic extract (R) poly(ethylene glycol) (PEG) (20...

Polyurethane–extracellular matrix membranes with bionanocomposites or coatings containing a small amount of biocompatible polymers such as hydrolyzed collagen, elastin, hyaluronic acid chondroitin sulfate, and silver were obtained by solvent casting electrospinning/electrospraying the polyurethane–extracellular matrix–Ag formulations onto pure polyurethane membrane in order to achieve improved antibacterial biomaterials for urinary catheters. Using Fourier transform infrared spectroscopy,...