Cellulose and chitin composite materials from an ionic liquid and a green co-solvent

Duan, Yaqing; Freyburger, Auriane; Kunz, Werner; Zollfrank, Cordt

doi:10.1016/j.carbpol.2018.03.045

Cited by 44 publications

(21 citation statements)

References 31 publications

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“…The increasingly serious environmental and energy issues have prompted the development of natural polymer materials [2,3]. Cellulose are widely used in our daily life and modern industrial production as renewable materials [4], composite materials [5], and cellulose derivatives [6,7,8]. The molecular weight (M) of cellulose affects the processing conditions, as well as the performance of the final cellulose products.…”

Section: Introductionmentioning

confidence: 99%

Elucidation of the Relationship between Intrinsic Viscosity and Molecular Weight of Cellulose Dissolved in Tetra-N-Butyl Ammonium Hydroxide/Dimethyl Sulfoxide

Yang

et al. 2019

Polymers

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The determination of molecular weight of natural cellulose remains a challenge nowadays, due to the difficulty in dissolving cellulose. In this work, tetra-n-butylammonium hydroxide (TBAH) and dimethyl sulfoxide (DMSO) aqueous solution (THDS) were used to dissolve cellulose in a few minutes under room temperature into true molecular solutions. That is to say, the cellulose was dissolved in the solution in molecular level, and the viscosity of the solution is linearly dependent on the concentration of cellulose. The relationship between the molecular weight of cellulose and the intrinsic viscosity tested in such dilute solutions has been established in the form of the Mark–Houwink equation, [η]=0.24×DP1.21. The value of 1.21 indicates that the cellulose molecules dissolve in THDS quite well. The cellulose dispersion in the THDS was proved to be in molecular level by atomic force microscope (AFM) and dynamic light scattering (DLS). The reliability of the established Mark–Houwink equation was cross-checked by the gel permeation chromatography (GPC) and traditional copper (II) ethylenediamine (CED) method. No considerate degradation was observed by comparing the intrinsic viscosity and the degree of polymerization (DP) values of the original with and the regenerated cellulose samples. The natural cellulose can be molecularly dispersed in the multiple-component solvent (THDS), and kept stable for a certain period. A time efficient and reliable method has been supplied for determination of the degree of polymerization and the molecular weight of cellulose.

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Section: Introductionmentioning

confidence: 99%

Elucidation of the Relationship between Intrinsic Viscosity and Molecular Weight of Cellulose Dissolved in Tetra-N-Butyl Ammonium Hydroxide/Dimethyl Sulfoxide

Yang

et al. 2019

Polymers

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“…Cellulose is the most abundant natural renewable polymer on Earth. It is a linear polysaccharide formed by β-1-4-linked d -glucopyranose repeating units [ 7 ]. It has gained special attention due to its biodegradability, hydrophilicity, biocompatibility, non-toxicity, high mechanical strength, and thermal and chemical stability [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Morphological, Release and Antibacterial Performances of Amoxicillin-Loaded Cellulose Aerogels

Chen

et al. 2018

Molecules

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Cellulose has been widely used in the biomedical field. In this study, novel cellulose aerogels were firstly prepared in a NaOH-based solvent system by a facile casting method. Then amoxicillin was successfully loaded into cellulose aerogels with different loadings. The morphology and structure of the cellulose aerogels were characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The drug release and antibacterial activities were also evaluated. The drug release results showed that cellulose aerogels have controlled amoxicillin release performance. In vitro antibacterial assay demonstrated that the cellulose aerogels exhibited excellent antibacterial activity with the amoxicillin dose-dependent activity. Therefore, the developed cellulose aerogels display controlled release behavior and efficient antibacterial performance, thus confirming their potential for biomedical applications.

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“…Remarkably, it has also been reported that ILs can be employed for the selective dissolution and extraction of desired components from raw biomass without the need of purification, 94 such as wood, 95 cellulose-rich pulp, 21 and crab and shrimp shells. [95][96][97][98][99][100] Take chitin as an example, most of the current industrial extraction of chitin involves multiple processes with the use of harsh acids and caustic soda at elevated temperatures, 66 which are waste-and energyintensive. Besides, degradation of the chitin structure often occurred during the process, leading to a reduced molecular mass (M) and degree of acetylation (DA), thus changing the properties of the biopolymer.…”

Section: Dissolution Of Biopolymers In Ilsmentioning

confidence: 99%

“…96 Moreover, this less chemical-and energy-intensive process can retain the acetylation of chitin, indicating that chitin is not deacetylated into chitosan during the dissolution process. 98 During the dissolution, ILs can hold higher concentrations of biopolymers compared to other solvents, which enhances the process efficiency. 102,103 For example, chitosan with a high M can be dissolved by 1-butyl-3methylimidazolium acetate ([BMIM][Ac]) to achieve up to 50 wt% concentration by completely disrupting the hydrogen bonds in the structure of chitosan, suggesting excellent dissolution.…”

Section: Dissolution Of Biopolymers In Ilsmentioning

confidence: 99%

Ionic liquids for the preparation of biopolymer materials for drug/gene delivery: a review

et al. 2018

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Cellulose and chitin composite materials from an ionic liquid and a green co-solvent

Cited by 44 publications

References 31 publications

Elucidation of the Relationship between Intrinsic Viscosity and Molecular Weight of Cellulose Dissolved in Tetra-N-Butyl Ammonium Hydroxide/Dimethyl Sulfoxide

Elucidation of the Relationship between Intrinsic Viscosity and Molecular Weight of Cellulose Dissolved in Tetra-N-Butyl Ammonium Hydroxide/Dimethyl Sulfoxide

Morphological, Release and Antibacterial Performances of Amoxicillin-Loaded Cellulose Aerogels

Ionic liquids for the preparation of biopolymer materials for drug/gene delivery: a review

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