Thermo-compression molding of chitosan with a deep eutectic mixture for biofilms development

Galvis-Sánchez, Andrea C.; Sousa, Ana; Hilliou, L.; Gonçalves, M. P.; Souza, Hiléia K.S.

doi:10.1039/c5gc02231b

Cited by 66 publications

(31 citation statements)

References 29 publications

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“…[1][2][3] Due to its low cost, easy lm-forming capacity, environmental friendliness, alkali stability, biodegradability, excellent mechanical properties and thermal stability, it is very valuable in the preparation of membranes, and has attracted great research interest. [4][5][6][7] Many studies have reported that chitosan has an excellent ability to form microspheres, membranes and bers, which gives it a signicant advantage over other absorbable membrane materials in the design of packaging structures. 8 However, chitosan is generally prepared using acetic acid as solventa method that brings a number of disadvantages, such as minimal thickness, peculiar smell and fragile nature of the lms at low concentration of chitosan, as well as easy drying and curl.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of chitosan membranes

et al. 2018

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The present study investigates a new solvent system for the dissolution of chitosan and a new method for preparing chitosan membranes. First, aqueous tartaric acid was used to pretreat chitosan. Then, the chitosan was precipitated with ethanol or other regenerating agents, and 1.5 mL of 1-ethyl-3methylimidazolium acetate ([EMIM]AC) was added to obtain translucent suspensions. The chitosan membranes were prepared by casting the suspensions on glass plates and allowing solvent evaporation.The structure and properties of the films were investigated by SEM, FT-IR, XRD and TGA. Also, the mechanical properties, as well as physical and chemical characteristics, of the chitosan films were evaluated. The results indicated that the optimum dissolution time was 10 min and the most suitable drying temperature was 60 C. The thus-prepared film was moderately thick (about 0.02 mm) and had a smooth surface, without curling. The chitosan film prepared by ethanol regeneration had a tensile strength of up to 24 MPa, a minimum swelling degree of 78%, and a water vapor transmission rate of 270 g m À2 d À1 without the addition of plasticizer. View Article Online a Calculated from the Mark-Houwink equation: [h] ¼ KM a The molecular weight of chitosan M ¼ 398300.This journal is

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of chitosan membranes

et al. 2018

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“…Chitosan can be also processed using DES. Galvis-Sánchez et al (2016) [111] prepared thermocompression molded films with chitosan (deacetylation degree 90%), CC, and citric acid (CA) (molar ratio 1:1). CC and CA were added separately to chitosan (not as a liquid mixture), and this three components system was heated for 30 min at 70 • C and then 3% acetic acid solution was added, and the formed paste was hot-pressed at 120 • C. In comparison to chitosan/CA films, chitosan/CC/CA ones exhibited higher water sorption ability.…”

Section: Novel Green Solvents As Plasticizers For Thermomechanical Trmentioning

confidence: 99%

Chitosan Composites in Packaging Industry—Current Trends and Future Challenges

et al. 2020

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Chitosan-based composites play an important role in food packaging applications and can be used either as films or as edible coatings. Due to their high costs and lower performance (i.e., lower barrier against water vapor, thermal, and mechanical properties) when compared to the traditional petroleum-based plastics, the use of such biopolymers in large-scale is still limited. Several approaches of chitosan composites in the packaging industry are emerging to overcome some of the disadvantages of pristine polymers. Thus, this work intends to present the current trends and the future challenges towards production and application of chitosan composites in the food packaging industry.

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“…Finally, DESs have been used for chitosan processing. Galvis-Sánchez et al [ 282 ] prepared thermocompression molded films with chitosan (DA 90%), using [Ch]Cl:CA (1:1). SEM and XRD analysis revealed that acetic acid interacted with CA and promoted the reorganization of chitosan molecules and their amorphization, which in turn resulted in an increase in the elongation at break of the films.…”

Section: Chitinmentioning

confidence: 99%

Use of Ionic Liquids and Deep Eutectic Solvents in Polysaccharides Dissolution and Extraction Processes towards Sustainable Biomass Valorization

et al. 2020

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A shift to a bioeconomy development model has been evolving, conducting the scientific community to investigate new ways of producing chemicals, materials and fuels from renewable resources, i.e., biomass. Specifically, technologies that provide high performance and maximal use of biomass feedstocks into commodities with reduced environmental impact have been highly pursued. A key example comprises the extraction and/or dissolution of polysaccharides, one of the most abundant fractions of biomass, which still need to be improved regarding these processes’ efficiency and selectivity parameters. In this context, the use of alternative solvents and the application of less energy-intensive processes in the extraction of polysaccharides might play an important role to reach higher efficiency and sustainability in biomass valorization. This review debates the latest achievements in sustainable processes for the extraction of polysaccharides from a myriad of biomass resources, including lignocellulosic materials and food residues. Particularly, the ability of ionic liquids (ILs) and deep eutectic solvents (DESs) to dissolve and extract the most abundant polysaccharides from natural sources, namely cellulose, chitin, starch, hemicelluloses and pectins, is scrutinized and the efficiencies between solvents are compared. The interaction mechanisms between solvent and polysaccharide are described, paving the way for the design of selective extraction processes. A detailed discussion of the work developed for each polysaccharide as well as the innovation degree and the development stage of dissolution and extraction technologies is presented. Their advantages and disadvantages are also identified, and possible synergies by integrating microwave- and ultrasound-assisted extraction (MAE and UAE) or a combination of both (UMAE) are briefly described. Overall, this review provides key information towards the design of more efficient, selective and sustainable extraction and dissolution processes of polysaccharides from biomass.

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Thermo-compression molding of chitosan with a deep eutectic mixture for biofilms development

Abstract: A deep eutectic mixture of choline chloride and citric acid was used for the preparation of chitosan bio-films by thermo-compression molding.

Cited by 66 publications

References 29 publications

Preparation and characterization of chitosan membranes

Preparation and characterization of chitosan membranes

Chitosan Composites in Packaging Industry—Current Trends and Future Challenges

Use of Ionic Liquids and Deep Eutectic Solvents in Polysaccharides Dissolution and Extraction Processes towards Sustainable Biomass Valorization

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