The use of polysaccharide-based materials presents an eco-friendly technological solution, by reducing dependence on fossil resources while reducing a product's carbon footprint, when compared to ...conventional plastic packaging materials. This review discusses the potential of polysaccharides as a raw material to produce multifunctional materials for food packaging applications. The covered areas include the recent innovations and properties of the polysaccharide-based materials. Emphasis is given to hemicelluloses, marine polysaccharides, and bacterial exopolysaccharides and their potential application in the latest trends of food packaging materials, including edible coatings, intelligent films, and thermo-insulated aerogel packaging.
The aim of this study was the development of novel polysaccharide based films intended to be used as edible food packaging material. The films were prepared by solution casting method using highly ...methoxylated pectin (PEC) and poly(ethylene glycol) (PEG) of various molecular weights (400, 600 and 1000 gmol-1) in different ratios (5:1, 3:1 and 1:1). The film formation was supported by hydrogen bonding between PEC and PEG, which was evidenced by means of ATR-FTIR and NMR analysis. TGA revealed that generally PEG behaves like a pro-degrading agent for pectin, except in the case of PEC/PEG film with a ratio of 1:1. Furthermore, DSC thermograms indicated that PEG1000 exists as a separate phase in the pectin matrix while the formulations with PEG400 and PEG600 showed mainly amorphous morphology. The addition of PEG enhanced the plasticization of PEC films, as evidenced by progressive decreasing of the glass transition temperature values (Tg). The tensile test measurements showed that increasing concentration of PEG produced weaker and more flexibile films. Due to the increased molecular mobility, the pectin phase became more permeable to water vapor as the PEG concentration increased. The obtained results showed that the combination of both polymers resulted in interesting bio–inspired edible films with the potential to compete with commercially used synthetic package materials.
Display omitted
•Edible films from pectin and PEG were prepared.•Film formation was supported by hydrogen bonding between components.•Thermal and mechanical properties were affected by concentration and molecular weight of PEG.•The increasing PEG concentration caused an increase in water vapor permeability.•Films showed potential to be used in food packaging industry.
This study represents new material based on chitosan modified by zeolite A as adsorbent for anionic dye, using Bezactive Orange 16 as a model compound. Interactions between dye and chitosan/zeolite A ...film at initial concentrations and pH dye solution was investigated. In order to determine kinetics and the mechanism of adsorption four kinetic models were used. The results showed that the adsorption of Bezactive Orange 16 dye onto chitosan/zeolite A can be best described by pseudo-second order model. According to the Langmuir model, the maximum adsorption capacity reached 305.8mg/g. The films could be potentially used as absorbents for anionic dye removal in wastewater treatment process.
Hydrolysed collagen obtained from bovine leather by-products were loaded with ginger essential oil and processed by the electrospinning technique for obtaining bioactive nanofibers. Particle size ...measurements of hydrolysed collagen, GC-MS analysis of ginger essential oil (EO), and structural and SEM examinations of collagen nanofibers loaded with ginger essential oil collected on waxed paper, cotton, and leather supports were performed. Antioxidant and antibacterial activities against
and
and antifungal activity against
were also determined. Data show that the hydrolysed collagen nanofibers loaded with ginger EO can be used in the medical, pharmaceutical, cosmetic, or niche fields.
In this paper, a novel sycamore maple seeds based activated carbon was synthesized, characterized and examined for sorption of atenolol from aqueous solutions. This low cost sorbent with great ...regeneration ability is shown to be a good option for fast uptake of atenolol in high extent due to its significant reactivity and developed mesoporous structure. For interpretation of the equilibrium data, Langmuir, Freundlich, and Temkin models were considered. All the models exhibited high fitting coefficients of determination with a contrasting vast deviation of estimated values for maximum sorption capacity towards experimental value of 93.71 mg/g. Considering kinetics, the pseudo-first and pseudo-second-order models, Elovich model, and the intraparticle diffusion model were employed for testing the experimental data. The process was shown to be fast with the greatest uptake extent in the initial 40 min from beginning of the process while equilibrium was attained after 2 h. Strong impacts of suspension pH, temperatures and sorbent dosage on the process were evidenced.
Display omitted
•Sycamore maple seed based activated carbon was synthesized for the first time.•It is the first time to apply activated carbon from plant precursors for atenolol sorption.•qmax of 93.71 mg/g pronounced large potential of this carbon for atenolol removal from aquaeous solutions.•Novel low cost sorbent for atenolol removal with high regeneration rate was presented.
The present paper reports on pectin based films modified with carboxymethyl cellulose intended for food packaging. The films are prepared by solvent‐casting method with different carboxymethyl ...cellulose content and cross‐linker concentration (Ca2+ ions) in the presence of glycerol as a plasticizer. FT‐IR spectra of the prepared films propose that carboxyl group from pectin are mainly involved in interactions with CMC, whereas −OH groups are mainly involved in self‐associated hydrogen bonding of neat polymers. Further, an addition of carboxymethyl cellulose improved mechanical properties compared to pure pectin films, while TGA analysis confirmed satisfying thermal stability regarding their potential application as packaging material. Finally, water vapor permeability values are in the range of 1.32 × 10−7 up to 2.03 × 10−7 g/m h Pa.
The use of polymeric adsorbents for the removal of azo dyes from solution has
been reviewed. Adsorption techniques are widely used to remove certain
classes of pollutants from waters, especially ...those which are not easily
biodegradable. The removal of azo dyes as pollutants from wastewaters of
textile, paper, printing, leather, pharmaceutical and other industries has
been addressed by the researchers. The wider use of already available
adsorbents is restricted due to their high costs which lead to investigation
and development of new materials that can be cheaper, eficient and easy
regenerated. The aim of this article is to present to the readers the
widespread investigations in recent years of synthetic and natural polymers
as adsorbents and potential replacement of conventional adsorbents. This
review presents only the data obtained using raw, hydrogel, grafted and
crosslinked forms of synthetic and nature based polymers, and the discussion
is limited to these polymer-based materials and their adsorption properties.
Display omitted
•Synthesis and characterization of novel copper mineralized agar composite films.•Carbonate and phosphate mineral phases improve physico-chemical properties of films.•Incorporation of ...mineral phases improved UV and water vapor barrier properties.•Cu-mineralized agar films show excellent antimicrobial activity.•Cu-mineralized agar films could have potential application in biomedicine.
New agar-based composite films with increasing Cu-carbonate and Cu-phosphate mineral phase content were prepared by in situ mineralization and solvent casting method. SEM and optical analysis revealed that Cu-carbonate phase had better compatibility with agar matrix than Cu-phosphate phase. Incorporation of both mineral phases improved mechanical and water vapor barrier properties of the obtained mineralized films, in concentration dependent manner. When 5 mM of carbonate precursor was incorporated into agar matrix, mechanical resistance was enchanced for 44% and water vapor barrier property for 40%. The release of Cu (II) was higher in acidic conditions for both mineralized composites and remained in the range of specific release limits for this metal. In addition, both mineralized composite films exhibited distinctive antimicrobial activity against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria. Overall, the Cu-carbonate and Cu-phosphate mineralized agar films showed potential to be used for food packaging materials, agriculture or medical purposes.
•Pectin-TiO2 nanocomposite aerogels were investigated.•Addition of TiO2 into pectin matrix improved mechanical and thermal properties.•Pectin-TiO2 aerogels have lower thermal conductivity than air.
...Environmental-friendly pectin-TiO2 nanocomposite aerogels were prepared via sol-gel process and subsequent drying under supercritical conditions. The first step includes dissolution of pectin in water, addition of proper amount of TiO2 colloid and crosslinking reaction induced in the presence of tert-butanol and zinc ions. Then, the gels are subjected to the solvent exchange and supercritical CO2 drying. The influence of TiO2 nanoparticles on the textural, mechanical, thermal and antibacterial properties of aerogels was investigated. Results indicate that in the presence of TiO2 nanoparticles (NPs) mechanical, thermal and antimicrobial properties of pectin-based aerogels are improved in comparison to the control pectin aerogels. It should be emphasized that the thermal conductivity of pectin-based aerogels (0.022–0.025 W m−1 K−1) is lower than the thermal conductivity of air. Generally, the results propose that the pectin-TiO2 nanocomposite aerogels, as bio-based material, might have potential application for the storage of temperature-sensitive food.
In this study, pectin based films including different amounts of sodium alginate were prepared by casting method. All the films, with and without polyglycerol as plasticizer, were crosslinked with ...zinc ions in order to extend their potential functionality. The development of junction points, occurring during the crosslinking process with zinc ions, induced the increasing of free volume with following changing in chemico-physical properties of films. The inclusion of alginate in pectin based formulations improved the strength of zinc ions crosslinking network, whereas the addition of polyglycerol significantly improved mechanical performance. Finally, zinc-crosslinked films evidenced antimicrobial activity against the most common exploited pathogens: Staphylococcus Aureus, Escherichia Coli and Candida Albicans. These results suggest that zinc-crosslinked based films can be exploitable as novel bio-active biomaterials for protection and disinfection of medical devices.
PDF
