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The effect of polymer/plasticiser ratio in film forming solutions on the proper...
Fundo, Joana F.; Galvis-Sánchez, Andrea C.; Delgadillo, Ivonne; Silva, Cristina L. M.; Quintas, Mafalda A. C.In this work physical-chemical properties of chitosan/ glycerol film forming solutions (FFS) and the resulting films were analysed. Solutions were prepared using different concentrations of plasticising agent (glycerol) and chitosan. Films were produced by solvent casting and equilibrated in a controlled atmosphere. FFS water activity and rheological behaviour were determined. Films water content, solubility, w...
Molecular dynamics and structure in physical properties and stability of food s...
Fundo, Joana F.; Quintas, Mafalda A. C.; Silva, Cristina L. M.Physical properties and stability are critical for delivering safe and healthy food to the consumers and thus is a theme that attracts food scientists for a long time. Recently, literature suggests that stability can be fully grasped only if food molecular dynamics and structure are taken into consideration, i.e. an appropriate understanding of the behaviour of food products requires knowledge of its compositio...
The effect of polymer/plasticiser ratio in film forming solutions on the proper...
Fundo, Joana; Galvis-Sanchez, Andrea C.; Delgadillo, Ivonne; Silva, Cristina L. M.; Quintas, Mafalda A. C.In this work physical-chemical properties of chitosan/ glycerol film forming solutions (FFS) and the resulting films were analysed. Solutions were prepared using different concentrations of plasticising agent (glycerol) and chitosan. Films were produced by solvent casting and equilibrated in a controlled atmosphere. FFS water activity and rheological behaviour were determined. Films water content, solubility, w...
Fresh-cut melon quality during storage: an NMR study of water transverse relaxa...
Fundo, Joana F.; Amaro, Ana L.; Madureira, Ana Raquel; Carvalho, Alexandra; Feio, Gabriel; Silva, Cristina L. M.; Quintas, Mafalda A. C.Molecular mobility is a fundamental parameter which reflects the dynamic properties of food components and contributes to food degradation reactions comprehension. Fresh-cut fruits have become an important food market segment. However, processing of fruits promotes faster its physiological deterioration, biochemical changes and microbial degradation. The purpose of this work was to use NMR methodology as a tool...
Relationship between molecular mobility, microstructure and functional properti...
Fundo, Joana; Carvalho, Alexandra; Feio, Gabriel; Silva, Cristina L. M.; Quintas, Mafalda A. C.Foods are partially crystalline partially amorphous systems. Edible films are considered good models for food systems due to their interesting physical properties, quite straightforward matrices, and easy reproduction. Chitosan is a semicrystalline biopolymer, biocompatible, biodegradable, with antimicrobial activity and filmogenic properties, and it has been thoroughly used in edible films studies. The purpose...
Molecular mobility, composition and structure analysis in glycerol plasticised ...
Fundo, Joana F.; Fernandes, Rui; Almeida, Pedro L.; Carvalho, Alexandra; Feio, Gabriel; Silva, Cristina L. M.; Quintas, Mafalda A. C.This study was developed with the purpose to investigate the effect of polysaccharide/plasticiser concentration on the microstructure and molecular dynamics of polymeric film systems, using transmission electron microscope imaging (TEM) and nuclear magnetic resonance (NMR) techniques. Experiments were carried out in chitosan/glycerol films prepared with solutions of different composition. The films obtained aft...
Fresh-cut pear quality during storage : a NMR study of water transverse relaxat...
Fundo, Joana; Carvalho, Alexandra; Feio, Gabriel; Silva, Cristina L. M.; Quintas, Mafalda A. C.Fresh-cut fruits have become an important food market segment due to increasing demand for fresh, healthy and convenient foods. However, processing fruits promotes a decrease in its stability with a faster physiological deterioration, biochemical changes and microbial degradation. Recently, food stability is strongly attributed to molecular dynamics and “water availability”. Understanding cooperatively changes ...
A NMR contribute to understand fresh-cut melon behaviour during storage
Fundo, Joana F; Carvalho, Alexandra; Feio, Gabriel; Silva, Cristina L. M.; Quintas, Mafalda A. C.Authors Joana F. Fundo acknowledges Fundacão para a Ciência e a Tecnologia grant SFRH/BD/62176/2009. This work was supported by NaJonal Funds from FCT through project PEst-OE/EQB/LA0016/2011.; info:eu-repo/semantics/publishedVersion
Fresh-cut pear quality during storage: a NMR study of water transverse relaxati...
Fundo, Joana; Carvalho, Alexandra; Feio, Gabriel; Silva, Cristina L.M.; Quintas, Mafalda A. C.Fresh-cut fruits have become an important food market segment due to increasing demand for fresh, healthy and convenient foods. However, processing fruits promotes a decrease in its stability with a faster physiological deterioration, biochemical changes and microbial degradation. Recently, food stability is strongly attributed to molecular dynamics and “water availability”. Understanding cooperatively changes ...
Molecular mobility, composition and structure analysis in glycerol plasticised ...
Fundo, J. F.; Fernandes, Rui; Almeida, Pedro M.; Carvalho, Alexandra; Feio, Gabriel; Silva, Cristina L. M.; Quintas, Mafalda A. C.This study was developed with the purpose to investigate the effect of polysaccharide/plasticiser concentration on the microstructure and molecular dynamics of polymeric film systems, using transmission electron microscope imaging (TEM) and nuclear magnetic resonance (NMR) techniques. Experiments were carried out in chitosan/glycerol films prepared with solutions of different composition. The films obtained aft...