Determinacion de la bioactividad y la resistencia a la compresion de bloques de Poliapatita

Fernández, Haney Castro; Lozano, O.

doi:10.1590/s0100-40422010000400024

Cited by 4 publications

(1 citation statement)

References 4 publications

(5 reference statements)

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“…Bioactivity is defined as the ability of a material to chemically interact with compounds, microorganisms, or pathogens [ 17 ]. The bioactivity of CS has been related to the antimicrobial, antifungal, and antiviral properties, providing important contributions in different applications, such as additives, agro-food, pharmaceutical, and medical [ 18 ].…”

Section: Properties and Bioactivity Of Chitosanmentioning

confidence: 99%

Trends in Chitosan as a Primary Biopolymer for Functional Films and Coatings Manufacture for Food and Natural Products

Díaz‐Montes

Castro-Muñoz

2021

Polymers

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Some of the current challenges faced by the food industry deal with the natural ripening process and the short shelf-life of fresh and minimally processed products. The loss of vitamins and minerals, lipid oxidation, enzymatic browning, and growth of microorganisms have been the main issues for many years within the innovation and improvement of food packaging, which seeks to preserve and protect the product until its consumption. Most of the conventional packaging are petroleum-derived plastics, which after product consumption becomes a major concern due to environmental damage provoked by their difficult degradation. In this sense, many researchers have shown interest in edible films and coatings, which represent an environmentally friendly alternative for food packaging. To date, chitosan (CS) is among the most common materials in the formulation of these biodegradable packaging together with polysaccharides, proteins, and lipids. The good film-forming and biological properties (i.e., antimicrobial, antifungal, and antiviral) of CS have fostered its usage in food packaging. Therefore, the goal of this paper is to collect and discuss the latest development works (over the last five years) aimed at using CS in the manufacture of edible films and coatings for food preservation. Particular attention has been devoted to relevant findings in the field, together with the novel preparation protocols of such biodegradable packaging. Finally, recent trends in new concepts of composite films and coatings are also addressed.

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Section: Properties and Bioactivity Of Chitosanmentioning

confidence: 99%

Trends in Chitosan as a Primary Biopolymer for Functional Films and Coatings Manufacture for Food and Natural Products

Díaz‐Montes

Castro-Muñoz

2021

Polymers

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Effect of bioglass nanoparticles on the properties and bioactivity of poly(lactic acid) films

Canales

Saavedra

Flores

et al. 2020

J Biomedical Materials Res

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Bioglass nanoparticles (n‐BGs, 54SiO2:40CaO:6P2O5 mol %) with about 27 nm diameter were synthesized by the sol–gel method and incorporated into a poly(lactic acid) (PLA) matrix by the melting process in order to obtain nanocomposites with filler contents of 5, 10, and 25 wt %. Our results showed that during the cooling scan, the crystallization temperature (Tc) of the PLA/n‐BG nanocomposites decreased 13°C as compared to neat PLA. The presence of nanoparticles also decreased the thermal stability of the PLA matrix, as nanocomposites presented up to about 20°C lower degradation temperatures in a nitrogen atmosphere. The presence of n‐BG increased the stiffness of the polymer matrix, and for instance the composite with 25 wt % of filler presented about 52.6% higher Young's modulus than neat PLA. n‐BG incorporation into PLA increased also the hydrolytic degradation of the polymer over time. When the PLA composites were immersed in simulated body fluid, an apatite layer was formed on their surface, as verified by Fourier transform infrared, X‐Ray Diffraction (XRD), and scanning electron microscopy‐EDS, showing that the presence of n‐BG induced bioactivity on the PLA matrix. Moreover, the viability of cervical uterine adenocarcinoma cells was higher on PLA/n‐BG nanocomposite with 25 wt % of filler. The presence of n‐BG barely gave an antibacterial effect on the polymer matrix, despite the well‐known biocidal properties of these nanoparticles. Our results show that the presence of n‐BGs is a proper route for improving the bioactivity of PLA with potential application in tissue engineering.

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In vitro release kinetics and physical, chemical and mechanical characterization of a POVIAC ® /CaCO 3 /HAP-200 composite

Aragón

González

Fuentes

et al. 2011

J Mater Sci: Mater Med

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Coralline calcium-hydroxyapatite and calcium carbonate from Porites Porites coral were added to a polymeric matrix based on polyvinyl acetate (POVIAC(®)), to obtain a novel bone substitute composite as well as a system for the controlled drug (cephalexin) release. Composite samples with different compositions were characterized by physical-chemical and mechanical methods. Furthermore, the in vitro release profile of cephalexin and the kinetic behavior of its release from these composites were analyzed by appropriate mathematical models. It was shown that there is no chemical interaction between the inorganic filler and the polymer matrix, each conserving the original properties of the raw materials. The compressive mechanical strength and Young modulus of the composite with 17.5% of POVIAC(®), has better mechanical properties than those of cancellous bone. The variation of POVIAC(®) content can affect the cephalexin release kinetic in the composite. The cephalexin release mechanism from the composites can be considered as the result of the joint contribution of a prevailing Fickian diffusion and of polymer chain relaxation. It was also demonstrated that cephalexin is occluded inside the composites and not on their surface.

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Determinacion de la bioactividad y la resistencia a la compresion de bloques de Poliapatita

Cited by 4 publications

References 4 publications

Trends in Chitosan as a Primary Biopolymer for Functional Films and Coatings Manufacture for Food and Natural Products

Trends in Chitosan as a Primary Biopolymer for Functional Films and Coatings Manufacture for Food and Natural Products

Effect of bioglass nanoparticles on the properties and bioactivity of poly(lactic acid) films

In vitro release kinetics and physical, chemical and mechanical characterization of a POVIAC ® /CaCO 3 /HAP-200 composite

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