scholarly journals Development and Characterization of a Biodegradable PLA Food Packaging Hold Monoterpene–Cyclodextrin Complexes against Alternaria alternata

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1720 ◽  
Author(s):  
Velázquez-Contreras Friné ◽  
Acevedo-Parra Hector ◽  
Nuño-Donlucas Sergio Manuel ◽  
Núñez-Delicado Estrella ◽  
Gabaldón José Antonio
Keyword(s):  
Alternaria Alternata ◽  
Food Packaging ◽  
Polymer Surface ◽  
Thermal Characterization ◽  
Intermolecular Forces ◽  
Polymer Chains ◽  
Economic Losses ◽  
Poly Lactic Acid ◽  
Injection Process

The fungi of the genus Alternaria are among the main pathogens causing post-harvest diseases and significant economic losses. The consumption of Alternaria contaminated foods may be a major risk to human health, as many Alternaria species produce several toxic mycotoxins and secondary metabolites. To protect consumer health and extend the shelf life of food products, the development of new ways of packaging is of outmost importance. The aim of this work was to investigate the antifungal capacity of a biodegradable poly(lactic acid) (PLA) package filled with thymol or carvacrol complexed in β-cyclodextrins (β-CDs) by the solubility method. Once solid complexes were obtained by spray drying, varying proportions (0.0%, 1.5%, 2.5%, and 5.0 wt%) of β-CD–thymol or β-CD–carvacrol were mixed with PLA for packaging development by injection process. The formation of stable complexes between β-CDs and carvacrol or thymol molecules was assessed by Fourier-transform infrared spectroscopy (FTIR). Mechanical, structural, and thermal characterization of the developed packaging was also carried out. The polymer surface showed a decrease in the number of cuts and folds as the amount of encapsulation increased, thereby reducing the stiffness of the packaging. In addition, thermogravimetric analysis (TGA) revealed a slight decrease in the temperature of degradation of PLA package as the concentration of the complexes increased, with β-CD–carvacrol or β-CDs–thymol complexes acting as plasticisers that lowered the intermolecular forces of the polymer chains, thereby improving the breaking point. Packages containing 2.5% and 5% β-CD–carvacrol, or 5% β-CD–thymol showed Alternaria alternata inhibition after 10 days of incubation revealing their potential uses in agrofood industry.

scholarly journals Compatibility of Chitosan in Polymer Blends by Chemical Modification of Bio-based Polyesters

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1939
Author(s):  
Oscar Vernaez ◽  
Katharina Julia Neubert ◽  
Rodion Kopitzky ◽  
Stephan Kabasci
Keyword(s):  
Food Packaging ◽  
Polymer Chains ◽  
Poly Lactic Acid ◽  
Covalent Bonds ◽  
Molecular Weights ◽  
Grafting Reaction ◽  
Internal Mixer ◽  
In Situ Functionalization

For some applications of bioplastics like food packaging or medical devices, applying additives can be necessary to avoid microbial activity and hinder biofilm or fouling formation. A currently promising additive is chitosan (CS), the deacetylated form of the biogenic scaffolding material chitin. Due to its hydrophilicity, chitosan is not compatible with most of the thermoplastic bio-based polymers like poly(lactic acid) (PLA) or polyhydroxyalkanoates (PHA). In this work, compatibilization between chitosan and two selected bio-based polyesters, PLA and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), was enhanced by grafting maleic anhydride (MAH) and glycidyl methacrylate (GMA), respectively, onto polymer chains using peroxide. The success of grafting was confirmed via titration methods. The effects of grafting agent and peroxide concentrations on grafting reaction and the physical and thermal properties of the functionalized polyesters were investigated. Compounding of the functionalized polyesters with different weight portions of chitosan was accomplished in a discontinuous internal mixer by in-situ functionalization, followed by blending with chitosan. The titration method, scanning electron microscopy, DSC, FTIR and mechanical characterization of the composites showed good interfacial adhesion and suggest the formation of covalent bonds between functional groups of the polyesters and chitosan, especially for the samples functionalized with GMA. The molecular weights (Mw) of the samples showed a change in the molecular weight related to the thermal degradation of the sample. The Mw of the samples grafted with MAH are lower than those functionalized with GMA. Furthermore, integration of chitosan into non-functionalized PLA polymer matrix showed a nucleating effect, while for PHBV, the increase of crystallinity with the content of chitosan was only observed for grafted PHBV.

scholarly journals Study on Thermal Behavior of Some Biocompatible and Biodegradable Materials Based on Plasticized PLA, Chitosan, and Rosemary Ethanolic Extract

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Cornelia Vasile ◽  
Niță Tudorachi ◽  
Traian Zaharescu ◽  
Raluca Nicoleta Darie-Nita ◽  
Catalina Natalia Cheaburu-Yilmaz
Keyword(s):  
Thermal Behavior ◽  
Food Packaging ◽  
Ethanolic Extract ◽  
Thermal Characterization ◽  
Poly Lactic Acid ◽  
Rosemary Extract ◽  
Scanning Calorimetry ◽  
Efficient Protection ◽  
Ft Ir

Thermal characterization of some multifunctional environmentally friendly materials based on plasticized poly (lactic acid) (PLA)/chitosan (CS) and rosemary extract (R) previously obtained is presented. Differential scanning calorimetry (DSC) associated with other complex investigations such as chemiluminescence and coupled thermogravimetry (TG)/Fourier-transform infrared spectroscopy (FT-IR)/mass spectroscopy (MS) was performed in order to test both the thermal behavior and the biocomposition–property relationship. It was established that the rosemary ethanolic extract offers an efficient protection against thermoxidative degradation to the new developed plasticized PLA-based biocomposites which show good thermal properties, being suitable for both medical and food packaging applications.

Gas transport and thermal characterization of mono- and di-polyethylene films used for food packaging

2005 ◽  
Vol 99 (4) ◽  
pp. 1590-1599 ◽  
Author(s):  
Saša Mrkić ◽  
Kata Galić ◽  
Marica Ivanković ◽  
Sandra Hamin ◽  
Nada Ciković
Keyword(s):  
Food Packaging ◽  
Gas Transport ◽  
Thermal Characterization ◽  
Polyethylene Films

Morphological, Mechanical, and Thermal Characterization of Poly(Lactic Acid)/Cellulose Multifilament Fibers Prepared by Melt Spinning

2016 ◽  
Vol 37 (4) ◽  
pp. 1193-1205 ◽  
Author(s):  
Tassadit Aouat ◽  
Mustapha Kaci ◽  
Eric Devaux ◽  
Christine Campagne ◽  
Aurélie Cayla ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Melt Spinning ◽  
Thermal Characterization ◽  
Poly Lactic Acid

scholarly journals The Effect of Jackfruit Skin Powder and Fiber Bleaching Treatment in PLA Composites with Incorporation of Thymol

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2622
Author(s):  
Muhammad Najib Ahmad Marzuki ◽  
Intan Syafinaz Mohamed Amin Tawakkal ◽  
Mohd Salahuddin Mohd Basri ◽  
Siti Hajar Othman ◽  
Siti Hasnah Kamarudin ◽  
...  
Keyword(s):  
Food Packaging ◽  
Fibre Composite ◽  
Low Cost ◽  
Thermal Characterization ◽  
Natural Fibre ◽  
Poly Lactic Acid ◽  
Tropical Fruit ◽  
Fibre Composites ◽  
The Matrix ◽  
Bleaching Treatment

Food packaging has seen a growth in the use of materials derived from renewable resources such as poly(lactic acid) (PLA). However, the initial costs to produce bioplastics are typically high. Tropical fruit waste as naturally sourced fibres, such as jackfruit skin, can be used as a cost-reducing filler for PLA. The main objective in this study is to fabricate a low-cost natural fibre-reinforced polymer that potentially applies in packaging with the aid of bleaching treatment. The treatment shows a rougher surface fibre in Scanning electron microscopy (SEM) micrographs and it is expected to have better mechanical locking with the matrix, and this is found similar with a Fourier-transform infrared spectroscopy (FTIR) analysis. Unfortunately, fibre insertion does find low tensile performances, yet bleached-fibre composites improved its performance significantly. A similar situation was found in the thermal characterization where a low-thermal stability natural fibre composite has lower thermal behaviour and this increased with bleaching treatment. Besides, bleached-fibre composites have a longer service period. Besides, a 15 wt% thymol insertion inhibits the growth of Gram-positive bacteria in the composites and the non-treated fibre composite has better thymol effects. The 30 wt% of the bleached-fibre insertion composite has a high potential to reduce the cost of bioplastic products with minimum alterations of overall performances.

scholarly journals Mechanical, Morphological and Thermal Characterization of Compatibilized Poly(lactic acid)/Thermoplastic Starch Blends

2020 ◽  
Vol 13 (1) ◽  
pp. 1-13
Author(s):  
László Lendvai ◽  
Dávid Brenn
Keyword(s):  
Lactic Acid ◽  
Interfacial Adhesion ◽  
Thermal Characterization ◽  
Thermoplastic Starch ◽  
Chain Extender ◽  
Coupling Agents ◽  
Poly Lactic Acid ◽  
Binary Blends ◽  
Starch Blends

A two-step compounding procedure was used to produce binary blends composed of poly(lactic acid) (PLA)  and thermoplastic starch (TPS) with varying component ratios. Subsequently, three different chemical connectors were introduced in order to enhance the interfacial adhesion between the PLA and the TPS. Maleic anhydride, blocked isocyanate, and chain extender were used as coupling agents. Mechanical, morphological and thermal properties of PLA/TPS blends were determined. It was revealed that the initial interfacial adhesion between the components is weak. Out of the three coupling agents introduced, the chain extender proved to be the most effective, however, the improvement achieved in the mechanical properties was still marginal. According to the thermogravimetric analysis thermal stability was not significantly affected by any of the coupling agents.

scholarly journals Migration and Degradation in Composting Environment of Active Polylactic Acid Bilayer Nanocomposites Films: Combined Role of Umbelliferone, Lignin and Cellulose Nanostructures

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 282
Author(s):  
Magdalena L. Iglesias-Montes ◽  
Francesca Luzi ◽  
Franco Dominici ◽  
Luigi Torre ◽  
Liliana B. Manfredi ◽  
...  
Keyword(s):  
Food Packaging ◽  
Functional Characterization ◽  
Poly Lactic Acid ◽  
Packaging Materials ◽  
Food Packaging Materials ◽  
Bilayer Films ◽  
Active Food Packaging ◽  
Migration Limit

This study was dedicated to the functional characterization of innovative poly(lactic acid) (PLA)-based bilayer films containing lignocellulosic nanostructures (cellulose nanocrystals (CNCs) or lignin nanoparticles (LNPs)) and umbelliferone (UMB) as active ingredients (AIs), prepared to be used as active food packaging. Materials proved to have active properties associated with the antioxidant action of UMB and LNPs, as the combination of both ingredients in the bilayer formulations produced a positive synergic effect inducing the highest antioxidant capacity. The results of overall migration for the PLA bilayer systems combining CNCs or LNPs and UMB revealed that none of these samples exceeded the overall migration limit required by the current normative for food packaging materials in both non-polar and polar simulants. Finally, all the hydrophobic monolayer and bilayer films were completely disintegrated in composting conditions in less than 18 days of incubation, providing a good insight on the potential use of these materials for application as active and compostable food packaging.

Thermal Characterization of Biodegradable Poly (Lactic Acid)/Clay Nanocomposites

2009 ◽  
pp. 219-225 ◽  
Author(s):  
Parakalan Krishnamachari ◽  
Jian Zhang ◽  
Jizhong Yan ◽  
Abolghasem Shahbazi ◽  
Leonard Uitenham ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Thermal Characterization ◽  
Poly Lactic Acid ◽  
Clay Nanocomposites ◽  
Biodegradable Poly

scholarly journals Production and Characterization of Porous Polymeric Membranes of PLA/PCL Blends with the Addition of Hydroxyapatite

2019 ◽  
Vol 3 (2) ◽  
pp. 45 ◽  
Author(s):  
Nayara Koba de Moura ◽  
Idália A. W. B. Siqueira ◽  
João Paulo de Barros Machado ◽  
Hueliton Wilian Kido ◽  
Ingrid Regina Avanzi ◽  
...  
Keyword(s):  
Polymer Surface ◽  
Calcium Nitrate ◽  
Polymer Membranes ◽  
Ammonium Phosphate ◽  
Polymeric Membranes ◽  
Porous Polymer ◽  
Poly Lactic Acid ◽  
Biological Studies ◽  
Phosphate Salts

Polymer membranes have been widely used in guided tissue regeneration (GTR) and guided bone regeneration (GBR). The literature recognizes that poly (lactic acid) (PLA)/poly (ε-caprolactone) (PCL) blends have better physicochemical properties and that a porous polymer surface facilitates cell adhesion and proliferation. In addition, hydroxyapatite (HAp) incorporated into the polymer matrix promotes osteoinduction properties and osteoconduction to the polymer-ceramic biocomposite. Therefore, polymer membranes of PLA/PCL blend with the addition of HAp could be an alternative to be used in GBR. HAp was obtained by precipitation using the mixture of solutions of tetrahydrate calcium nitrate and monobasic ammonium phosphate salts. The porous membranes of the PLA/PCL (80/20) blend with the addition of HAp were obtained by solvent casting with a controlled humidity method, with the dispersion of HAp in chloroform and subsequent solubilization with the components of the blend. The solution was poured into molds for solvent evaporation under a controlled humidity atmosphere. The membranes showed the formation of pores on their surface, together with dispersed HAp particles. The results showed an increase in the surface porosity and improved bioactivity properties with the addition of HAp. Moreover, in biological studies with cell culture, it was possible to observe that the membranes with HAp have no cytotoxic effect on MC3T3 cells. These results indicate a promising use of the new biomaterial for GBR.

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