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Your search keyword '"Nano-biocomposites"' showing total 54 results
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54 results on '"Nano-biocomposites"'

51. Nano-biocomposite films with modified cellulose nanocrystals and synthesized silver nanoparticles

Author

Fortunati, Elena, Rinaldi, S., Peltzer, M., Bloise, N., Visai, L., Armentano, I., Jiménez, A., Latterini, L., Kenny, José María, Fortunati, Elena, Rinaldi, S., Peltzer, M., Bloise, N., Visai, L., Armentano, I., Jiménez, A., Latterini, L., and Kenny, José María

Abstract

Ternary nano-biocomposite films based on poly(lactic acid) (PLA) with modified cellulose nanocrystals (s-CNC) and synthesized silver nanoparticles (Ag) have been prepared and characterized. The functionalization of the CNC surface with an acid phosphate ester of ethoxylated nonylphenol favoured its dispersion in the PLA matrix. The positive effects of the addition of cellulose and silver on the PLA barrier properties were confirmed by reductions in the water permeability (WVP) and oxygen transmission rate (OTR) of the films tested. The migration level of all nano-biocomposites in contact with food simulants were below the permitted limits in both non-polar and polar simulants. PLA nano-biocomposites showed a significant antibacterial activity influenced by the Ag content, while composting tests showed that the materials were visibly disintegrated after 15 days with the ternary systems showing the highest rate of disintegration under composting conditions. © 2013 Elsevier Ltd. All rights reserved.

Published
2014

52. Combined effects of cellulose nanocrystals and silver nanoparticles on the barrier and migration properties of PLA nano-biocomposites

Author

Alfonso Jiménez, Jose Maria Kenny, Mercedes Ana Peltzer, Ilaria Armentano, Elena Fortunati, Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología, and Análisis de Polímeros y Nanomateriales

Subjects
Materials science, Barrier properties, Cellulose nanocrystals, technology, industry, and agriculture, Nano-biocomposites, Nanoparticle, Nanotechnology, Migration kinetics, Silver nanoparticle, Lactic acid, Food packaging, chemistry.chemical_compound, Chemical engineering, chemistry, Nanocrystal, Pulmonary surfactant, Nano, Poly(lactic acid), Química Analítica, Silver nanoparticles, Ternary operation, Food Science
Abstract

Poly(lactic acid) (PLA)-based high performance nano-biocomposites were prepared to be used in active food packaging. Pristine (CNC) and surfactant modified cellulose nanocrystals (s-CNC) with silver (Ag) nanoparticles were used as the matrix modifiers. Binary and ternary systems were prepared. Morphological investigations revealed the good distribution of silver nanoparticles in PLA ternary systems. The combination of s-CNC and Ag nanoparticles increased the barrier effect of the produced films while the results of overall migration for the PLA nano-biocomposites revealed that none of the samples exceeded the overall migration limit, since results were well below 60 mg kg−1 of simulant. The authors gratefully acknowledge the financial support from the National Consortium of Materials Science and Technology (INSTM) and Spanish Ministry of Science and Technology (Project MAT2011-28640-C02-01).

Published
2013

53. Combined effects of cellulose nanocrystals and silver nanoparticles on the barrier and migration properties of PLA nano-biocomposites

Author

Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología, Fortunati, Elena, Peltzer, Mercedes Ana, Armentano, Ilaria, Jiménez, Alfonso, Kenny, José María, Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología, Fortunati, Elena, Peltzer, Mercedes Ana, Armentano, Ilaria, Jiménez, Alfonso, and Kenny, José María

Abstract

Poly(lactic acid) (PLA)-based high performance nano-biocomposites were prepared to be used in active food packaging. Pristine (CNC) and surfactant modified cellulose nanocrystals (s-CNC) with silver (Ag) nanoparticles were used as the matrix modifiers. Binary and ternary systems were prepared. Morphological investigations revealed the good distribution of silver nanoparticles in PLA ternary systems. The combination of s-CNC and Ag nanoparticles increased the barrier effect of the produced films while the results of overall migration for the PLA nano-biocomposites revealed that none of the samples exceeded the overall migration limit, since results were well below 60 mg kg−1 of simulant.

Published
2013

54. Natural additives and agricultural wastes in biopolymer formulations for food packaging.

Author

Valdés A, Mellinas AC, Ramos M, Garrigós MC, and Jiménez A

Abstract

The main directions in food packaging research are targeted toward improvements in food quality and food safety. For this purpose, food packaging providing longer product shelf-life, as well as the monitoring of safety and quality based upon international standards, is desirable. New active packaging strategies represent a key area of development in new multifunctional materials where the use of natural additives and/or agricultural wastes is getting increasing interest. The development of new materials, and particularly innovative biopolymer formulations, can help to address these requirements and also with other packaging functions such as: food protection and preservation, marketing and smart communication to consumers. The use of biocomposites for active food packaging is one of the most studied approaches in the last years on materials in contact with food. Applications of these innovative biocomposites could help to provide new food packaging materials with improved mechanical, barrier, antioxidant, and antimicrobial properties. From the food industry standpoint, concerns such as the safety and risk associated with these new additives, migration properties and possible human ingestion and regulations need to be considered. The latest innovations in the use of these innovative formulations to obtain biocomposites are reported in this review. Legislative issues related to the use of natural additives and agricultural wastes in food packaging systems are also discussed.

Published
2014
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