Nanobiocomposites of Carrageenan, Zein, and Mica of Interest in Food Packaging and Coating Applications
10 May 2010-Journal of Agricultural and Food Chemistry (American Chemical Society)-Vol. 58, Iss: 11, pp 6884-6894
TL;DR: The nanocomposites of a red-algae-derived carrageenan, mica, and their blends with zein prolamine obtained by solvent casting can have significant potential to develop packaging films and coatings for shelf-life extension of food products.
Abstract: The present study presents the development and characterization of biocomposites of a red-algae-derived carrageenan, mica, and their blends with zein prolamine obtained by solvent casting. The morphology of the blends was characterized by scanning and transmission electron microscopy (SEM and TEM), optical microscopy, and atomic force microscopy (AFM). Mechanical behavior, water barrier, water uptake, and UV−vis protection of the cast films were also investigated. The results indicated that the addition of 10 wt % glycerol to the blends resulted in a better dispersion of the additive and, for that reason, a better improvement for the studied properties. The composites were seen colored but transparent and exhibited the ability to block the UV−vis radiation because of the characteristic absorbing properties of the filler. Nevertheless, the main conclusion from the work is that the nanocomposites were seen to act as a reinforcing plasticizer and also led to significantly reduced water permeability and uptak...
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TL;DR: In this article, a mixture of locust bean gum (LBG) and carrageenan (κ-car) was used to enhance the barrier properties of the films leading to a decrease of water vapor permeability.
260 citations
Cites result from "Nanobiocomposites of Carrageenan, Z..."
...The obtained values are in agreement with reported results for carrageenan and galactomannan-based films (Martins et al., 2010; Sanchez-Garcia et al., 2010)....
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...The obtained values are in agreement with reported results for carrageenan and galactomannan-based films (Martins et al., 2010; Mikkonen et al., 2007; Sanchez-Garcia et al., 2010)....
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TL;DR: In this paper, the current situation of these novel nanobiostructured packaging materials is described, together with the global challenges to be faced and the possible strategies to overcome some of the pending issues in this exciting and potentially world changing research and development area.
Abstract: Recent years have witnessed a tremendous expansion of research and technology developments in the nanotechnology field resulting in significant application developments in the food and agricultural areas. This is particularly the case of the food packaging field, where significant advances in the nanoreinforcement of biobased materials provide a more solid ground towards increasing the technical and economical competitiveness of renewable polymers for different applications. However, there is still a long way to go, not only in the materials development and energy consumption minimization parcels, but also regarding the widespread commercialization of these novel nanostructured biopolymers and the full characterization of any particular potential toxicological and environmental impacts. In this paper, the current situation of these novel nanobiostructured packaging materials is described, together with the global challenges to be faced and the possible strategies to overcome some of the pending issues in this exciting and potentially world changing research and development area.
168 citations
01 Jan 2016
TL;DR: A detailed view on the nutritional and potential health benefits of maize can be found in this paper, where the authors present a detailed view of maize and its potential applications in pharmaceutical and nutraceutical areas.
Abstract: 1 Abstract: Maize or corn (Zea mays L.) is an important cereal crop of the world. It is a source of nutrition as well as phytochemical compounds. Phytochemicals play an important role in preventing chronic diseases. It contains various major phytochemi- cals such as carotenoids, phenolic compounds, and phytosterols. It is believed to have potential anti-HIV activity due to the presence of Galanthus nivalis agglutinin (GNA) lectin or GNA-maize. A tablespoon of maize oil satisfies the requirements for essential fatty acids for a healthy child or adult. Decoction of maize silk, roots, leaves, and cob are used for bladder problems, nausea, vomiting, and stomach complaints. Zein an alcohol-soluble prolamine found in maize endosperm has unique novel applications in pharmaceutical and nutraceutical areas. Resistant starch (RS) from maize reduces the risk of cecal cancer, atherosclerosis, and obesity- related complications. This review presents a detailed view on the nutritional and potential health benefits of maize.
153 citations
TL;DR: A detailed view on the nutritional and potential health benefits of maize is presented and Zein an alcohol-soluble prolamine found in maize endosperm has unique novel applications in pharmaceutical and nutraceutical areas.
Abstract: Maize or corn (Zea mays L.) is an important cereal crop of the world. It is a source of nutrition as well as phytochemical compounds. Phytochemicals play an important role in preventing chronic diseases. It contains various major phytochemicals such as carotenoids, phenolic compounds, and phytosterols. It is believed to have potential anti-HIV activity due to the presence of Galanthus nivalis agglutinin (GNA) lectin or GNA-maize. A tablespoon of maize oil satisfies the requirements for essential fatty acids for a healthy child or adult. Decoction of maize silk, roots, leaves, and cob are used for bladder problems, nausea, vomiting, and stomach complaints. Zein an alcohol-soluble prolamine found in maize endosperm has unique novel applications in pharmaceutical and nutraceutical areas. Resistant starch (RS) from maize reduces the risk of cecal cancer, atherosclerosis, and obesity-related complications. This review presents a detailed view on the nutritional and potential health benefits of maize.
134 citations
TL;DR: Nanocomposite films of thermoplastic corn starch with talc particles were obtained by thermo-compression in order to study the effect of filler on structure, optical, and thermal properties.
133 citations
References
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TL;DR: In this article, a theory has been developed which predicts the minimum permeability that can be expected for a polymer filled with plate-like particles, and models are also developed for the permeability of liquids through filled polymers when the liquid adsorbs or collects at the filler-polymer interface.
Abstract: A theory has been developed which predicts the minimum permeability that can be expected for a polymer filled with platelike particles. Models are also developed for the permeability of liquids through filled polymers when the liquid adsorbs or collects at the filler-polymer interface. Some of the cases discussed include different types of dispersions, orientation of filler particles, and the effects of filler aggregation. Permeability, especially of liquids, is extremely complex, and many different types of behavior can be expected.
937 citations
TL;DR: In this article, the authors derived a relation between the specific conductivities of the suspension, the suspending medium and the suspended spheroids, and the volume concentration of the spheroid, where $x$ is a function of the ratio
Abstract: Conductivity measurements may give values for (1) the specific conductivity, (2) the concentration or (3) eccentricity of form of the suspended particles of suspensions such as biological tissues, blood and cream. Mathematical theory. The following relation is derived: $\frac{(\frac{k}{{k}_{1}\ensuremath{-}1})}{(\frac{k}{{k}_{1}+x})}=\frac{\ensuremath{\rho}(\frac{{k}_{2}}{{k}_{1}\ensuremath{-}1})}{(\frac{{k}_{2}}{{k}_{1}+x})}$, where $k$, ${k}_{1}$ and ${k}_{2}$ are the specific conductivities of the suspension, the suspending medium and the suspended spheroids, $\ensuremath{\rho}$ is the volume concentration of the suspended spheroids, and $x$ is a function of the ratio $\frac{{k}_{2}}{{k}_{1}}$ and the ratio $\frac{a}{b}$ of the axis of symmetry of the spheroids to the other axis. For the case of spheres, $x=2$ and the formula reduces to that of Lorentz-Lorentz and Clausius-Mossotti. Curves are given showing the variation of $x$ with $\frac{{k}_{2}}{{k}_{1}}$ for various values of $\frac{a}{b}$. Comparison with experimental data of Stewart for the conductivity of the blood of a dog (${k}_{2}=0$, $\frac{a}{b}=\frac{1}{4.25}$, $x=1.05$) shows excellent agreement for concentration from 10 to 90 per cent. Also the observations of Oker-Blom for two suspensions of sand in salted gelatine, give in each case constant values of $x$ for various concentrations.
787 citations
TL;DR: The development of nanocomposites is a new strategy to improve physical properties of polymers, including mechanical strength, thermal stability, and gas barrier properties, including montmorillonite and kaolinite clays and graphite nanoplates.
Abstract: The development of nanocomposites is a new strategy to improve physical properties of polymers, including mechanical strength, thermal stability, and gas barrier properties. The most promising nanoscale size fillers are montmorillonite and kaolinite clays. Graphite nanoplates are currently under study. In food packaging, a major emphasis is on the development of high barrier properties against the migration of oxygen, carbon dioxide, flavor compounds, and water vapor. Decreasing water vapor permeability is a critical issue in the development of biopolymers as sustainable packaging materials. The nanoscale plate morphology of clays and other fillers promotes the development of gas barrier properties. Several examples are cited. Challenges remain in increasing the compatibility between clays and polymers and reaching complete dispersion of nanoplates. Nanocomposites may advance the utilization of biopolymers in food packaging.
589 citations
TL;DR: In this paper, a modified atmosphere packaging system for minimally processed foods is proposed, for which the available packaging film materials are tailored to the specific demands of the food products, and a novelty in the project is the development of biodegradable packaging materials that can replace conventional synthetic materials.
Abstract: The improvement of the safety and quality of minimally processed foods is of major interest to both the consumer and the food industry and is the topic of an EU-sponsored research project with nine international partners. The project optimizes existing techniques and in addition develops novel technologies to ensure high quality and safe food products. Among the systems studied is Modified Atmosphere Packaging, for which the available packaging film materials are tailored to the specific demands of the food products. A novelty in the project is the development of biodegradable packaging materials that can replace conventional synthetic materials. Additionally, edible coatings that are applied directly on the food surface are designed which create a modified atmosphere. The edible coatings can be furnished with active compounds such as antimicrobials or antioxidants to obtain additional desired effects. Such packagings and coatings may protect very powerfully against microbial spoilage and loss of intrinsic product quality, resulting in a prolonged shelf-life. An overview of the development and application of edible films and coatings is given here, comprising recent results from the EU project with regard to the barrier properties of edible films and the inclusion of active compounds.
497 citations
TL;DR: In this article, the thermomechanical properties, morphology, and gas permeability of hybrid poly(lactic acid) (PLA) hybrid films with C 16 -MMT and Cloisite 25A were compared in detail.
Abstract: The thermomechanical properties, morphology, and gas permeability of hybrids prepared with three types of organoclays were compared in detail. Hexadecylamine-montmorillonite (C 16 -MMT), dodecyltrimethyl ammonium bromide-montmorillonite (DTA-MMT), and Cloisite 25A were used as organoclays in the preparation of nanocomposites. From morphological studies using transmission electron microscopy, most clay layers were found to be dispersed homogeneously in the matrix polymer, although some clusters or agglomerated particles were also detected. The initial degradation temperature (at a 2% weight loss) of the poly(lactic acid) (PLA) hybrid films with C 16 -MMT and Cloisite 25A decreased linearly with an increasing amount of organoclay. For hybrid films, the tensile properties initially increased but then decreased with the introduction of more of the inorganic phase. The O 2 permeability values for all the hybrids for clay loadings up to 10 wt % were less than half the corresponding values for pure PLA, regardless of the organoclay.
388 citations