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Jose Maria Lagaron - One of the best experts on this subject based on the ideXlab platform.
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electrospun active biopapers of food waste derived poly 3 hydroxybutyrate co 3 hydroxyvalerate with short term and long term Antimicrobial Performance
Nanomaterials, 2020Co-Authors: Kelly J Figueroalopez, Daniela Enescu, Sergio Torresginer, Lorenzo Pastrana, Miguel A Cerqueira, Luis Cabedo, Jose Maria LagaronAbstract:This research reports about the development by electrospinning of fiber-based films made of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) derived from fermented fruit waste, so-called bio-papers, with enhanced Antimicrobial Performance. To this end, different combinations of oregano essential oil (OEO) and zinc oxide nanoparticles (ZnONPs) were added to PHBV solutions and electrospun into mats that were, thereafter, converted into homogeneous and continuous films of ~130 μm. The morphology, optical, thermal, mechanical properties, crystallinity, and migration into food simulants of the resultant PHBV-based bio-papers were evaluated and their Antimicrobial properties were assessed against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) in both open and closed systems. It was observed that the Antimicrobial activity decreased after 15 days due to the release of the volatile compounds, whereas the bio-papers filled with ZnONPs showed high Antimicrobial activity for up to 48 days. The electrospun PHBV biopapers containing 2.5 wt% OEO + 2.25 wt% ZnONPs successfully provided the most optimal activity for short and long periods against both bacteria.
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Biosynthesis of silver nanoparticles and polyhydroxybutyrate nanocomposites of interest in Antimicrobial applications.
International journal of biological macromolecules, 2017Co-Authors: J.l. Castro-mayorga, Filomena Freitas, Maria A.m. Reis, María Auxiliadora Prieto, Jose Maria LagaronAbstract:Abstract This study deals with the optimization and scaling up of the production of poly(3-hydroxybutyrate), PHB, nanocomposites containing biosynthesized silver nanoparticles (AgNPs) to generate materials with Antimicrobial Performance. First, a comparative study of the chemical and biological synthesis of AgNPs during the fermentation process of Cupriavidus necator at shake flask-scale was carried out. These experiments demonstrated the inherent capacity of C. necator to reduce the silver salt and produce AgNPs without the need for adding a reducing agent and, that the method of synthesis (with or without reducing agent) affects the dispersion of the AgNPs and their Antimicrobial Performance. Finally, the process was scaled-up to a 10 Liters bioreactor and the relevant physical properties of the PHB-AgNPs nanocomposites pressed into films were determined. From the characterization work, the AgNPs were found to be well dispersed and distributed into the polymer matrix, having a maximum frequency of particles with average diameter of 76–95 nm. Moreover, the presence of AgNPs did not cause any effect on the thermal properties of the biopolymer, although a slight reduction in crystallinity was seen. The developed materials presented a strong Antimicrobial activity against the food-borne pathogens Salmonella enterica and Listeria monocytogenes, which makes them potentially suitable for active coatings and packaging applications. Complete biodisintegration of the samples occurred during composting conditions within the first 40 days. Interestingly, the presence of the AgNPs did not impair the profile of biodegradation of the microbial polymer.
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Antimicrobial beeswax coated polylactide films with silver control release capacity.
International journal of food microbiology, 2014Co-Authors: Antonio Martínez-abad, Jose Maria Lagaron, M.j. OcioAbstract:Although the application of silver based Antimicrobial systems is a widespread technology, its implementation in areas such as food packaging is still challenging. The present paper describes the fabrication of poly(lactic acid) (PLA) coated with beeswax with controlled release properties for sustained Antimicrobial Performance. Release of silver ions from the polymers was monitored voltammetrically under various conditions (surface contact, immersion in various liquid media and at different pH values) throughout at least 7days. A higher release was noted with decreasing pH while surface release was much slower than the release when immersed in liquid medium. While uncoated films demonstrated a high burst release which in some instances implied surpassing some current migration restrictions (
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Antibacterial Performance of solvent cast polycaprolactone (PCL) films containing essential oils
Food Control, 2013Co-Authors: Antonio Martínez-abad, Jose Maria Lagaron, Gloria Sánchez, V. Fuster, M.j. OcioAbstract:Abstract The increase of consumer demand for higher quality and longer shelf-life in foods, while reducing the use of non-compostable packaging materials, has encouraged research on biopolymers incorporating natural Antimicrobial compounds. Cinnamaldehyde (CNMA) and allyl isothiocyanate (AITC) were incorporated into polycaprolactone (PCL) films by solvent casting. The release study was carried out by means of ATR and transmission FTIR spectroscopy and showed high volatility of the essential oils during the film forming process. While only negligible quantities of AITC were retained in the polymer matrix after film curing, the release of CNMA was prolonged for at least 50 h at room temperature. PCL films incorporating 10 wt.-% and 20 wt.-% CNMA were further investigated using both a macrodilution technique and a vapour diffusion technique. MICs against Salmonella enterica, and Listeria monocytogenes in the liquid phase were determined to be 5.87 and 4.49 mM, for films containing 10 and 20 wt.-% of CNMA with regard to the polymer in solution. The influence of relative humidity (RH) and temperature on the Antimicrobial Performance of the active films was investigated in the vapour phase. RH was not found to play a key role in the release and Antimicrobial Performance of the films, while decreasing temperatures resulted in a considerable increase in the Antimicrobial effect. In a sealed environment, a concentration of less than 5.34 mg CNMA/L air from PCL with 20 wt.-% CNMA was able to cause complete inhibition of bacterial growth at 4 °C and 10 °C during at least 30 days. These results suggest that the combination of cold storage with biodegradable polyesters incorporating CNMA or other EOs could be an interesting approach in active packaging technologies.
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optimization of the biocide properties of chitosan for its application in the design of active films of interest in the food area
Food Hydrocolloids, 2009Co-Authors: P Fernandezsaiz, Jose Maria Lagaron, M.j. OcioAbstract:The influence on biocide Performance of some unprecedented physicochemical features of chitosan cast films such as film thickness, pH of the nutrient broth, film neutralization, film autoclave sterilization and temperature exposure were analyzed against Staphylococcus aureus and in some experiments also against Salmonella spp. The work demonstrates for the first time the influence of the release or positive migration of protonated glucosamine fractions from the biopolymer into the microbial culture as the responsible event for the Antimicrobial Performance of the biopolymer under the studied conditions. From the results, a reliable and reproducible method for the determination of the bactericidal activity of chitosan-based films was developed in an attempt to standardize the testing conditions for the optimum design of active Antimicrobial food packaging films and coating applications.
Jing Wang - One of the best experts on this subject based on the ideXlab platform.
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The size-controllable preparation of chitosan/silver nanoparticle composite microsphere and its Antimicrobial Performance.
Carbohydrate polymers, 2019Co-Authors: Jun Liang, Jing Wang, Rui Wang, Ruipeng Chen, Yunfeng SunAbstract:The control of chitosan/silver nanoparticle composite microsphere (CAgMs) size is crucial for tuning its function. In the current work, monodisperse organically-modified CAgMs with controllable size were synthesized using a two-step method. The fine-tuning of the microsphere size was confirmed by many reaction parameters while the cross-linking agent was the key research object. Through physical and thermodynamic analysis, we found the cross-linking agent-induced smaller size, higher silver concentration, more heightened glass transition temperature and stronger hydrogen bond network. The as-prepared microspheres exhibited strong bacteriostasis and fresh-keeping function depending on cross-linking agent concentration. The phenomenon is believed to be derived from the difference in microorganism adsorption and killing ability from induced varying specific surface area and encapsulated silver content. Our current work highlights the size-controllable preparation of CAgMs, and based on our findings, small size CAgMs can be a promising candidate in the field of antibacterial and fruit preservation applications.
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zeolitic imidazolate framework graphene oxide hybrid nanosheets functionalized thin film nanocomposite membrane for enhanced Antimicrobial Performance
ACS Applied Materials & Interfaces, 2016Co-Authors: Jing Wang, Yuanming Wang, Yatao Zhang, Adam Uliana, Bart Van Der BruggenAbstract:Inspired by the rational design concept, a novel Antimicrobial agent zeolitic imidazolate framework-8 (ZIF-8)/graphene oxide (GO) was synthesized and utilized as a novel and efficient bactericidal agent to fabricate Antimicrobial thin film nanocomposite (TFN) membranes via interfacial polymerization. The resultant hybrid nanosheets not only integrates the merits of both ZIF-8 and GO but also yields a uniform dispersion of ZIF-8 onto GO nanosheets simultaneously, thus effectively eliminating the agglomeration of ZIF-8 in the active layer of membranes. A ZIF-8/GO thin film nanocomposite (TFN-ZG) membrane with typical water permeability (40.63 L m–2 h–1 MPa–1) allows for efficient bivalent salt removal (rejections of Na2SO4 and MgSO4 were 100% and 77%, respectively). Furthermore, the synthesized ZIF-8/GO nanocomposites were verified to have an optimal Antimicrobial activity (MIC,128 μg/mL) in comparison with ZIF-8 and GO separately, which sufficiently endowed the TFN-ZG membrane with excellent Antimicrobial ...
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Zeolitic Imidazolate Framework/Graphene Oxide Hybrid Nanosheets Functionalized Thin Film Nanocomposite Membrane for Enhanced Antimicrobial Performance
ACS applied materials & interfaces, 2016Co-Authors: Jing Wang, Yuanming Wang, Yatao Zhang, Adam Uliana, Junyong Zhu, Jindun Liu, Bart Van Der BruggenAbstract:Inspired by the rational design concept, a novel Antimicrobial agent zeolitic imidazolate framework-8 (ZIF-8)/graphene oxide (GO) was synthesized and utilized as a novel and efficient bactericidal agent to fabricate Antimicrobial thin film nanocomposite (TFN) membranes via interfacial polymerization. The resultant hybrid nanosheets not only integrates the merits of both ZIF-8 and GO but also yields a uniform dispersion of ZIF-8 onto GO nanosheets simultaneously, thus effectively eliminating the agglomeration of ZIF-8 in the active layer of membranes. A ZIF-8/GO thin film nanocomposite (TFN-ZG) membrane with typical water permeability (40.63 L m–2 h–1 MPa–1) allows for efficient bivalent salt removal (rejections of Na2SO4 and MgSO4 were 100% and 77%, respectively). Furthermore, the synthesized ZIF-8/GO nanocomposites were verified to have an optimal Antimicrobial activity (MIC,128 μg/mL) in comparison with ZIF-8 and GO separately, which sufficiently endowed the TFN-ZG membrane with excellent Antimicrobial ...
Zhining Wang - One of the best experts on this subject based on the ideXlab platform.
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palygorskite silver nanoparticles incorporated polyamide thin film nanocomposite membranes with enhanced water permeating antifouling and Antimicrobial Performance
Chemosphere, 2019Co-Authors: Wenyi Wang, Yiming Li, Wenbo Wang, Baoyu Gao, Zhining WangAbstract:Abstract Palygorskite (Pal) is a highly hydrophilic clay mineral with tubular structure and high aspect ratio, which facilitates the attachment of nanoparticles to their surface. It has become a promising new membrane preparation additive due to its lotus root like tubular structure, low price and environmental friendliness. Silver nanoparticles (AgNPs) have excellent antibacterial ability, and their incorporation into the membrane can significantly improve the bacteriostasis of the membrane. Herein, Pal was coated by polydopamine (PDA), which acted as both the adhesive and reducing agent for AgNPs. The incorporation of the Pal/Ag nanocomposite resulted in a thin polyamide (PA) layer with rough surface morphology, which facilitated the improvement of membrane permeability. Furthermore, the Pal's parallel tubes with a 0.37 × 0.63 nm2 cross-sectional area provided nanochannels allowing fast pass through of water molecules. The as-prepared TFN-7.5Pal/Ag membrane exhibited a permeate flux of 39.9 LMH at 16 bar, which was 1.6 times as high as that of the TFC membrane, accompanied with an acceptable NaCl rejection of 98.3%. Besides, antibacterial tests demonstrated that the TFN membrane presented excellent antibacterial Performance against Escherichia coli (98.0%).
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Palygorskite/silver nanoparticles incorporated polyamide thin film nanocomposite membranes with enhanced water permeating, antifouling and Antimicrobial Performance.
Chemosphere, 2019Co-Authors: Wang Wenyi, Wenbo Wang, Baoyu Gao, Zhining WangAbstract:Palygorskite (Pal) is a highly hydrophilic clay mineral with tubular structure and high aspect ratio, which facilitates the attachment of nanoparticles to their surface. It has become a promising new membrane preparation additive due to its lotus root like tubular structure, low price and environmental friendliness. Silver nanoparticles (AgNPs) have excellent antibacterial ability, and their incorporation into the membrane can significantly improve the bacteriostasis of the membrane. Herein, Pal was coated by polydopamine (PDA), which acted as both the adhesive and reducing agent for AgNPs. The incorporation of the Pal/Ag nanocomposite resulted in a thin polyamide (PA) layer with rough surface morphology, which facilitated the improvement of membrane permeability. Furthermore, the Pal's parallel tubes with a 0.37 × 0.63 nm2 cross-sectional area provided nanochannels allowing fast pass through of water molecules. The as-prepared TFN-7.5Pal/Ag membrane exhibited a permeate flux of 39.9 LMH at 16 bar, which was 1.6 times as high as that of the TFC membrane, accompanied with an acceptable NaCl rejection of 98.3%. Besides, antibacterial tests demonstrated that the TFN membrane presented excellent antibacterial Performance against Escherichia coli (98.0%).
Wenyi Wang - One of the best experts on this subject based on the ideXlab platform.
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palygorskite silver nanoparticles incorporated polyamide thin film nanocomposite membranes with enhanced water permeating antifouling and Antimicrobial Performance
Chemosphere, 2019Co-Authors: Wenyi Wang, Yiming Li, Wenbo Wang, Baoyu Gao, Zhining WangAbstract:Abstract Palygorskite (Pal) is a highly hydrophilic clay mineral with tubular structure and high aspect ratio, which facilitates the attachment of nanoparticles to their surface. It has become a promising new membrane preparation additive due to its lotus root like tubular structure, low price and environmental friendliness. Silver nanoparticles (AgNPs) have excellent antibacterial ability, and their incorporation into the membrane can significantly improve the bacteriostasis of the membrane. Herein, Pal was coated by polydopamine (PDA), which acted as both the adhesive and reducing agent for AgNPs. The incorporation of the Pal/Ag nanocomposite resulted in a thin polyamide (PA) layer with rough surface morphology, which facilitated the improvement of membrane permeability. Furthermore, the Pal's parallel tubes with a 0.37 × 0.63 nm2 cross-sectional area provided nanochannels allowing fast pass through of water molecules. The as-prepared TFN-7.5Pal/Ag membrane exhibited a permeate flux of 39.9 LMH at 16 bar, which was 1.6 times as high as that of the TFC membrane, accompanied with an acceptable NaCl rejection of 98.3%. Besides, antibacterial tests demonstrated that the TFN membrane presented excellent antibacterial Performance against Escherichia coli (98.0%).
Bart Van Der Bruggen - One of the best experts on this subject based on the ideXlab platform.
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Zeolitic Imidazolate Framework/Graphene Oxide Hybrid Nanosheets Functionalized Thin Film Nanocomposite Membrane for Enhanced Antimicrobial Performance
ACS applied materials & interfaces, 2016Co-Authors: Jing Wang, Yuanming Wang, Yatao Zhang, Adam Uliana, Junyong Zhu, Jindun Liu, Bart Van Der BruggenAbstract:Inspired by the rational design concept, a novel Antimicrobial agent zeolitic imidazolate framework-8 (ZIF-8)/graphene oxide (GO) was synthesized and utilized as a novel and efficient bactericidal agent to fabricate Antimicrobial thin film nanocomposite (TFN) membranes via interfacial polymerization. The resultant hybrid nanosheets not only integrates the merits of both ZIF-8 and GO but also yields a uniform dispersion of ZIF-8 onto GO nanosheets simultaneously, thus effectively eliminating the agglomeration of ZIF-8 in the active layer of membranes. A ZIF-8/GO thin film nanocomposite (TFN-ZG) membrane with typical water permeability (40.63 L m–2 h–1 MPa–1) allows for efficient bivalent salt removal (rejections of Na2SO4 and MgSO4 were 100% and 77%, respectively). Furthermore, the synthesized ZIF-8/GO nanocomposites were verified to have an optimal Antimicrobial activity (MIC,128 μg/mL) in comparison with ZIF-8 and GO separately, which sufficiently endowed the TFN-ZG membrane with excellent Antimicrobial ...