Optimization of antibacterial and mechanical properties of an active LDPE/starch/nanoclay nanocomposite film incorporated with date palm seed extract using D-optimal mixture design approach (original) (raw)
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European Polymer Journal, 2007
Corn starch was modified by cross-linking with epichlorohydrin and plasticizer glycerol. X-ray diffraction studies showed that relative crystallinity of the native and cross-linked starch were similar and were not affected by cross-linking. Different films were prepared by blending corn starch, cross-linked starch or glycerol modified starch in LDPE. The mechanical properties of the films were studied for tensile strength, elongation, melt flow index, and burst strength. The properties of the blend films were compared with LDPE films. It was observed that with the blending of 7.5% native starch, there was a decrease in tensile strength, elongation and melt flow index but burst strength increased. The tensile strength, elongation and melt flow index of the films containing cross-linked starch was considerably higher than those containing native starch but the burst strength showed a reverse trend. For native starch and cross-linked starch modified with glycerol, the elongation and melt flow index of the films increased but burst strength decreased. Surface scanning of the blend films were done by scanning electron microscope. Film containing cross-linked starch/glycerol modified starch in the blend was observed to be smoother than the native starch blend films.
International Journal of Biological Macromolecules, 2018
Antimicrobial poly(lactide) (PLA)/poly(butylene adipate-co-terephthalate) (PBAT) blend films incorporated with grapefruit seed extract (GSE) were prepared using a solvent casting method. Effect of GSE on the morphological, water vapor barrier, thermostability, color, optical, and antimicrobial properties of PLA/PBAT composite films was investigated. The composite films showed a yellowish tint after incorporation of GSE and exhibited a high UV-light barrier property. Incorporation of GSE increased the flexibility and tensile strength of the composite films. Films incorporated with 7 wt% of GSE exhibited potent antibacterial activity against Listeria monocytogenes, but they showed only bacteriostatic activity against Escherichia coli. The PLA/PBAT-GSE composite film with UV-light barrier and antibacterial properties has a high potential for an active food packaging application.
Journal of Polymers and the Environment, 2021
In this work, the incorporation of additives i.e. glycerol, citric acid and zinc oxide at four-levels into poly(vinyl alcohol)/starch (PSt) films containing extracted spent coffee ground (ex-SCG) was designed and optimized using Taguchi method combined with Grey relational analysis. Citric acid was the most significant parameter affecting the antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). Addition of glycerol in PSt films enhanced water resistance and biodegradability of the samples, but decreased their tensile strength and modulus values. The presence of ZnO increased the tensile strength of PSt films. The Grey relational analysis showed that the optimal mix proportion for PSt film could be achieved at 10 wt% glycerol, 45 wt% citric acid and 1 wt% ZnO. The PSt films based on the optimized mix proportion of additives were used as packaging for fresh cherry tomatoes. The films remarkably inhibited growth of bacteria and maintained freshness of the packaged cherry tomatoes. Based on the finding in this work, experimentally made PSt films could have a potential for food preservation and antimicrobial packaging applications to enhance the quality and to extend the shelf-life of fresh fruits and vegetables.
Effect of Antimicrobial Edible Additives on Cassava Starch Biobased Films Characterization
Antimicrobial films appear in response of the searching for more competitive and aggregated value packaging. With the aim of developing packages that, besides active are also biodegradable, this work proposes to study the effect of antimicrobial additives (honey, cinnamon powder, clove powder, orange essential oil, pepper and coffee powder) on the characterization of cassava starch biobased films. The biofilms were characterized through their mechanical properties (tensile strength and elongation at break percentage), water vapor permeability and total solids content. The film forming solution was prepared with cassava starch, plasticizers (sucrose and inverted sugar) and the antimicrobial additives (honey, cinnamon powder, clove powder, orange essential oil, pepper and coffee powder). A cassava starch film containing only sucrose and inverted sugar served as control. To evaluate the biomaterials characterization, a factorial experimental design (27-3) with 3 central points was appl...
2014
In this study a novel nanobiodegrable composite based on Corn Starch /High density polyethylene (HDPE) / Linear low density polyethylene(LLDPE) and Nanoclay cloisite 30B were prepared by melt mixing. Three kind of compolymers such as: ethylene-vinyl alcohol (EVOH), ethylene vinyl acetate (EVA) and polyethylene grafted maleic anhydride (PE-gMA)were used as a compatibilizers in HDPE/LLDPE/Starch composites. In comparing the effect of the above compatibilizers, the mechanical properties of the biocomposites showed that the tensile strength, Young’s modulus and elongation at break increase when a polyethylene-g-maleic anhydride(PE-g-MA) copolymer was used as compatibilizer. In addition 3% wt of nano clay in the compsites , the results showed good dispersion of the nano particles cloisite 30B .Also a combination of intercalated and nearly exfoliated structure was obtained in the sample by microstructure study of X-ray diffraction and transmission electron microscope(TEM) analysis. Biodeg...
Journal of Food Processing and Preservation, 2020
Antibacterial packaging films were developed by incorporating tea polyphenol (TP) into corn distarch phosphate (CDP)/carboxymethyl cellulose (CMC) films via solvent casting. Incorporation of TP had a great influence on the physical properties of the composite films. The prepared composite films were evaluated by scanning electron microscopy and Fourier transform infrared spectroscopy, and their physical properties, moisture barrier properties, and antibacterial activities were investigated. Microstructural studies revealed that the surface of the CDP/CMC/TP composite films became rough and uneven sponge-like. Attenuated total reflectance Fourier transform infrared exhibited interactions between TP and CDP/CMC films matrix was caused by hydrogen bonding. Addition of TP into CDP/CMC films improved the extensibility, toughness, and moisture barrier properties of the composite films greatly. The CDP/CMC/TP composite films showed excellent antibacterial activity against Staphylococcus aureus, Bacillus subtilis, and Escherichia coli. The CDP/CMC/TP films are promising functional packaging materials. Practical applications Tea polyphenol (TP) exhibits effective antioxidant and antibacterial properties, which can be extracted from tea. In this work, we successfully fabricated a novel antibacterial films containing TP, and improved the physical properties of the films. This study can provide a good candidate and a promising way for the development of active packaging material in food industry. Moreover, there is immense potential in the application of food preservation.
Polymers
In the present study, various blended films from polyvinyl alcohol (PVA) and pinto bean starch (PBS) were prepared and the selected film was used to fabricate an antimicrobial packaging film. Different essential oils (EOs) were also exposed to minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) tests to find the most efficient EO against a range of microorganisms. From the primary studies, the PVA:PBS (80:20) and cinnamon essential oil (CEO) were chosen. Afterward, the blend composite film reinforced by 1, 2, and 3% CEO and several, physical, mechanical, structural, and antimicrobial attributes were scrutinized. The results showed a significant modification of the barrier and mechanical properties of the selected blended films as a result of CEO addition. Scanning electron micrographs confirmed the incorporation and distribution of CEO within the film matrix. The X-ray diffraction (XRD) patterns and Fourier transform infrared (FTIR) spectra indicated ...
Preparation and Evaluation of Antibacterial Thin Film Based on Starch Hybrid
Antibacterial compounds as sulfadiazine sodium salt (I) and polyhexamethylene guanidine hydrochloride(II) were loaded in thin film prepared from starch/polyvinyl alcohol mixture grafted with polymethacrylic acid. The effects of preparation parameters on the chemical and physicochemical properties of prepared film were determined. Prepared film was characterized before and after incorporation of antibacterial compounds by scanning electron microscopy (SEM), Antibacterial activity against gram positive bacteria (Staphylococcus aurous) and gram negative bacteria (Escherichia coli) and its biological activity (allergic or skin irritant) were examined. The result obtained show that, the optimum pH values for preparation of the film whether containing the antibacterial compounds or not were 5.5 and 6.2. The amount of the fixed antibacterial compound on the film increases with increasing its concentration in the treatment solution. Prepared films treated with sulfadiazine and polyhexamethylene guanidine hydrochloride have higher antibacterial activity against gram positive bacteria (staphylococcus aureous) and gram negative bacteria (Escherichia coli).
Antibacterial properties of LDPE nanocomposite films in packaging of UF cheese
The purpose of this study was to investigate antibacterial potential of low-density polyethylene (LDPE) packaging films incorporating silver (Ag), copper oxide (CuO) and zinc oxide (ZnO) nanoparticles in measuring of coliform amounts of ultra-filtrated (UF) cheese. The initial LDPE/nanoparticle composites were produced by melting extrusion followed by extruding the obtained composites through a die to achieve a film thickness of 45 ± 5 mm. The number of surviving coliform bacteria was decreased by 4.21 log cfu/g after 4 weeks of storage at 4 ± 0.5 C, whilst pure LDPE films showed a reduction of only 1.04 log cfu/g. A composition of 0% Ag, 1% CuO, 0% ZnO gave an optimum point in combined design using Design Expert analysis. A suitable microbial model was suggested for retarding coliform bacteria growth in UF cheese. The difference between the optimum point of nanocomposite film and its repeat was not significant (p < 0.05) by one-way ANOVA analysis using SPSS software, while the difference was significant for pure film. Migration of metallic nanoparticles into a food stimulant was within the accepted safe level.