Active Casein Coatings and Films for Perishable Foods: Structural Properties and Shelf-Life Extension
TL;DR: In this paper, a review of caseinate-based active coating and film is presented, which aims to give insights on the composition, rheology, structure, and properties.
Abstract: There is an urgent need to increase the food supplies to fulfil the demands of future generations as the population of the world is expected to grow beyond 10 billion by 2050. An essential component for ensuring global food security is to reduce food losses during the post-harvest stage. Active edible coatings and films are a promising sustainable preservation technology for shelf-life extension of food products by hindering decay kinetics of minimally processed fruits and vegetables (F&V), by restricting the mass transfer of moisture, aroma, or gases and carrying an active compound, such as an antioxidant or antimicrobial. Active protein-based coatings and films have the potential to extend the shelf-life of food products by decreasing their respiration rates, as they exhibit an excellent gas barrier and good mechanical properties as compared to other biopolymeric packaging. Among protein-based biopolymers, casein and its derivatives as packaging films have been extensively studied due to their low cost, complete biodegradability, and availability. Currently, there is no review study focusing on caseinate-based active coating and film, thus, this review aims to give insights on the composition, rheology, structure, and properties of caseinate-based formulations by critically discussing the results presented in the literature. A methodological approach was followed to obtain relevant literature to discuss the influence of additives on the shelf-life of F&V. Furthermore, changes in secondary structure of casein were observed after incorporation of bioactive compounds (i.e., phenolic acids). Likewise, there is a need to explore chemical interactions among bioactive compounds and biopolymer material by using in silico and laboratory trials as food additives have shown to influence the physicochemical properties of film and shelf-life of food products.
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TL;DR: In this paper , the impact of cold plasma on packaging properties of protein, polysaccharides, and their combinations was analyzed. And the authors concluded that cold plasma is an effective strategy to modify the inherent limitations of biopolymer-based packaging materials for food packaging applications.
Abstract: Biopolymers, like polysaccharides and proteins, are sustainable and green materials with excellent film-forming potential. Bio-based films have gained a lot of attention and are believed to be an alternative to plastics in next-generation food packaging. Compared to conventional plastics, biopolymers inherently have certain limitations like hydrophilicity, poor thermo-mechanical, and barrier properties. Therefore, the modification of biopolymers or their films provide an opportunity to develop packaging materials with desired characteristics. Among different modification approaches, the application of cold plasma has been a very efficient technology to enhance the functionality and interfacial characteristics of biopolymers. Cold plasma is biocompatible, shows uniformity in treatment, and is suitable for heat-sensitive components. This review provides information on different plasma generating equipment used for the modification of films and critically analyses the impact of cold plasma on packaging properties of films prepared from protein, polysaccharides, and their combinations. Most studies to date have shown that plasma treatment effectively enhances surface characteristics, mechanical, and thermal properties, while its impact on the improvement of barrier properties is limited. Plasma treatment increases surface roughness that enables surface adhesion, ink printability, and reduces the contact angle. Plasma-treated films loaded with antimicrobial compounds demonstrate strong antimicrobial efficacy, mainly due to the increase in their diffusion rate and the non-thermal nature of cold plasma that protects the functionality of bioactive compounds. This review also elaborates on the existing challenges and future needs. Overall, it can be concluded that the application of cold plasma is an effective strategy to modify the inherent limitations of biopolymer-based packaging materials for food packaging applications.
11 citations
01 Jan 2018
TL;DR: In this article, the authors are grateful to the Spanish government for the financial support from the national project RTA2012-00067-C02 (Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria, Spain and FEDER funds) and to the Conselleria d'Educacio of the Generalitat Valenciana (Spain) for A. Marin's PhD grant.
Abstract: We are grateful to the Spanish government for the financial support from the national project RTA2012-00067-C02 (Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria, Spain and FEDER funds) and to the Conselleria d'Educacio of the Generalitat Valenciana (Spain) for A. Marin's PhD grant.
9 citations
TL;DR: In this article , the gallic acid was used as an active food packaging for fruits and vegetables (F&V) in composite active films based on sodium caseinate/guar gum to investigate its effect on the structure, physicochemical properties, and the release kinetics from the film.
9 citations
TL;DR: In this article , the effect of edible coatings (EC) based on caseinat, Semperfresh and lecithin on the fruit quality, bioactive content and antioxidant activity of cherry laurel fruits stored at 4 ± 1 °C for 15 days was evaluated.
Abstract: Cherry laurel is one of the most important cherry species and naturally grown in Black sea region in Turkey. Its fruits are sold at high price in local markets in northern parts of Turkey. Cherry laurel fruits are very perishable with a limited shelf life due to a high metabolic activity and susceptibility to mechanical damage and microbial attack. The effect of edible coatings (EC) based on caseinat, Semperfresh and lecithin on the fruit quality, bioactive content and antioxidant activity of cherry laurel fruits stored at 4 ± 1 °C for 15 days was evaluated. The EC fruits compared with uncoated fruits in terms of weight loss, brix, color, pH, titratable acidity, reducing sugar, total sugar, sucrose, total phenolic content, DPPH-IC50, ABTS-IC50, total yeast-mold count, number of total mesophilic aerobic bacteria and ascorbic acid (Vitamin C). Results showed that Semperfresh coating was more promising on titratable acidity (0.26%), pH (4.63), invert sugar (11.77 g/100 g), total sugar (11.96 g/100 g) and sucrose (0.13 g/100 g), caseinat coating was found more promising for count of total yeast-mold count (2.93 log kob/g) and total mesophilic aerobic bacteria (3.44 log kob/g) and lecithin coating was more promising in terms of weight loss (6.77%). For radical scavenging activity and total phenolic content, Semperfresh was found more useful. Thus, caseinat, Semperfresh and lecithin showed to be a promising alternative in prolonging shelf life and preserving the quality of cherry laurel.
8 citations
TL;DR: In this paper , a green synthesis methodology was used to construct casein@CoFe2O4 and applied to immobilize laccase and remove crystal violet (CV) as an environmentally harmful synthetic tri-phenylmethane dye.
6 citations
References
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TL;DR: In this article, the antibacterial behavior of suspensions of zinc oxide nanoparticles (ZnO nanofluids) against E. coli has been investigated and the effects of particle size, concentration and the use of dispersants on the behavior of ZnO nanoparticles were examined.
Abstract: The antibacterial behaviour of suspensions of zinc oxide nanoparticles (ZnO nanofluids) against E. Coli has been investigated. ZnO nanoparticles from two sources are used to formulate nanofluids. The effects of particle size, concentration and the use of dispersants on the antibacterial behaviour are examined. The results show that the ZnO nanofluids have bacteriostatic activity against E. coli. The antibacterial activity increases with increasing nanoparticle concentration and increases with decreasing particle size. Particle concentration is observed to be more important than particle size under the conditions of this work. The results also show that the use of two types of dispersants (Polyethylene Glycol (PEG) and Polyvinylpyrolidone (PVP)) does not affect much the antibacterial activity of ZnO nanofluids but enhances the stability of the suspensions. SEM analyses of the bacteria before and after treatment with ZnO nanofluids show that the presence of ZnO nanoparticles damages the membrane wall of the bacteria. Electrochemical measurements using a model DOPC monolayer suggest some direct interaction between ZnO nanoparticles and the bacteria membrane at high ZnO concentrations.
1,269 citations
TL;DR: Books indicated that the particle size was the essential parameter which determined the antimicrobial effectiveness of the metal nanoparticles, and further studies should be performed to minimize the toxicity of metal and metal oxide nanoparticles to apply as proper alternatives for antibiotics and disinfectants especially in biomedical applications.
1,115 citations
24 Aug 2011
TL;DR: Baldwin and Hagenmaier as mentioned in this paper discussed the properties of protein-based films and coatings, including the gas exchange properties of proteins and polysaccharide coatings.
Abstract: Introduction Elizabeth Baldwin and Robert Hagenmaier Protein-based films and coatings Maria B. Perez-Gago Edible coatings from lipids, waxes, and resins David J. Hall Polysaccharide coatings Robert Soliva-Fortuny, Maria Alejandra Rojas-Grau, and Olga Martin-Belloso Gas-exchange properties of edible films and coatings Robert D. Hagenmaier Role of edible film and coating additives Roberto de Jesus Avena-Bustillos and Tara H. McHugh Coatings for fresh fruits and vegetables Jinhe Bai and Anne Plotto Coatings for minimally processed fruits and vegetables Sharon Dea, Christian Ghidelli, Maria B. Perez-Gago, and Anne Plotto Applications of edible films and coatings to processed foods Tara H. McHugh and Roberto de Jesus Avena-Bustillos Application of commercial coatings Yanyun Zhao Encapsulation of flavors, nutraceuticals, and antibacterials Stephane Desobry and Frederic Debeaufort Overview of pharmaceutical coatings Anthony Palmieri Regulatory aspects of coatings Guiwen A. Cheng and Elizabeth A. Baldwin
731 citations
TL;DR: Edible films and coatings are thin layers applied on food products to protect them from microbial growth, prolonging their shelf life and improving other quality aspects like sensory attributes, appearance, originality and freshness of ingredients.
594 citations
TL;DR: The use of different edible coatings (polysaccharides, proteins, lipids and composite) as carriers of functional ingredients on fresh fruits and vegetables to maximize their quality and shelf life is discussed.
Abstract: Edible coatings are an environmentally friendly technology that is applied on many products to control moisture transfer, gas exchange or oxidation processes. Edible coatings can provide an additional protective coating to produce and can also give the same effect as modified atmosphere storage in modifying internal gas composition. One major advantage of using edible films and coatings is that several active ingredients can be incorporated into the polymer matrix and consumed with the food, thus enhancing safety or even nutritional and sensory attributes. But, in some cases, edible coatings were not successful. The success of edible coatings for fresh products totally depends on the control of internal gas composition. Quality criteria for fruits and vegetables coated with edible films must be determined carefully and the quality parameters must be monitored throughout the storage period. Color change, firmness loss, ethanol fermentation, decay ratio and weight loss of edible film coated fruits need to b...
585 citations