Chitin nanocrystals prepared by oxidation of α-chitin using the O2/laccase/TEMPO system

Jiang, Jie; Ye, Wenbo; Yu, Juan; Fan, Yimin; Ono, Yuko; Saito, Tsuguyuki; Isogai, Akira

doi:10.1016/j.carbpol.2018.01.096

Cited by 70 publications

(39 citation statements)

References 32 publications

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“…(c1, c2) Adapted with permission from ref ( 341 ). Copyright 2014 American Chemical Society; (c3) Adapted with permission from ref ( 346 ). Copyright 2018 Elsevier B.V.; (c4) Adapted with permission from ref ( 261 ).…”

Section: Deconstruction and Modification Of Biopolymers And Biocolloidsmentioning

confidence: 99%

Deconstruction and Reassembly of Renewable Polymers and Biocolloids into Next Generation Structured Materials

et al. 2021

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This review considers the most recent developments in supramolecular and supraparticle structures obtained from natural, renewable biopolymers as well as their disassembly and reassembly into engineered materials. We introduce the main interactions that control bottom-up synthesis and top-down design at different length scales, highlighting the promise of natural biopolymers and associated building blocks. The latter have become main actors in the recent surge of the scientific and patent literature related to the subject. Such developments make prominent use of multicomponent and hierarchical polymeric assemblies and structures that contain polysaccharides (cellulose, chitin, and others), polyphenols (lignins, tannins), and proteins (soy, whey, silk, and other proteins). We offer a comprehensive discussion about the interactions that exist in their native architectures (including multicomponent and composite forms), the chemical modification of polysaccharides and their deconstruction into high axial aspect nanofibers and nanorods. We reflect on the availability and suitability of the latter types of building blocks to enable superstructures and colloidal associations. As far as processing, we describe the most relevant transitions, from the solution to the gel state and the routes that can be used to arrive to consolidated materials with prescribed properties. We highlight the implementation of supramolecular and superstructures in different technological fields that exploit the synergies exhibited by renewable polymers and biocolloids integrated in structured materials.

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Section: Deconstruction and Modification Of Biopolymers And Biocolloidsmentioning

confidence: 99%

Deconstruction and Reassembly of Renewable Polymers and Biocolloids into Next Generation Structured Materials

et al. 2021

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“…[ 84 ] The possible oxidation mechanism of the O 2 /laccase/TEMPO system is shown in Figure , this system can oxidize the hydroxyl groups on chitin C6 to aldehyde groups and rapidly oxidize to carboxyl groups. Jiang et al [ 85 ] added laccase to the chitin/TEMPO suspension and introduced oxygen, the C 6 ‐hydroxyl groups on the surface of the crystalline chitin microfibers was successfully oxidized selectively to C 6 ‐carboxyl groups. During the oxidation, no significant deacetylation and crystal size changes were detected, and rod‐shaped chitin nanofibers were prepared with an average length of 480 ± 200 nm and a width of 24 ± 17 nm.…”

Section: Preparation Methods Of Nano‐chitinmentioning

confidence: 99%

Recent Progress in Preparation and Application of Nano‐Chitin Materials

Yang

Liu

Pei

et al. 2020

Energy & Environ Materials

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Chitin is a kind of natural macromolecule material which was first discovered in mushrooms and was widely found in the shells of crustaceans and arthropods, the cell walls of fungi (yeast and mold) and algae, and the mollusks. The original chitin in nature usually has an antiparallel molecular chain alignment forming nanofibers connected by inter-and intramolecular hydrogen bonds. These microfibers consist of nanofibers about 2-5 nm in diameter, and about 300 nm long, embedded by protein matrices. Due to their unique dimensional, optical, mechanical, and other characteristics, the preparation of nano-chitin materials is an important subject. It is possible to extract nano-chitins from their sources with various methods, including acid hydrolysis, mechanical disintegration, TEMPO-mediated oxidation, electrospinning, and others. In this article, the latest progress in recent years in the preparation and applications of nano-chitin were reviewed. The morphology of the nano-chitins obtained from the above methods was presented. The advantages and disadvantages of each method were analyzed. An overview of applications of nano-chitins was discussed, including biomedicine, food applications, water treatment, green electronic materials, enzyme immobilization carriers, cotton textile materials, cosmetics, and others. REVIEW Nano-Chitin Materials

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“…In our previous study, we found that the concentration of TEMPO significantly influenced the oxidation efficiency and successfully prepared cellulose nanofibers and chitin nanocrystals with a TEMPO/laccase/O 2 system. [ 20,21 ] However, the oxidation performed in stoichiometric amounts of TEMPO, while TEMPO/NaBr/NaOCl oxidation mainly performed in catalytic amounts. At the same time, the oxidation time was much longer.…”

Section: Methodsmentioning

confidence: 99%

Rate‐Limited Reaction in TEMPO/Laccase/O₂ Oxidation of Cellulose

Jiang

Chen

et al. 2020

Macromol. Rapid Commun.

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The environment‐friendly oxidation of cellulose by the 2,2,6,6‐tetramethyl‐1‐piperidinyloxy (TEMPO)/laccase/O2 system is an alternative route with huge potential to prepare cellulose nanofibers. It is found that the concentration of TEMPO significantly affects the oxidation efficiency. An effective method for improving the oxidation effect is to increase the TEMPO concentration and prolong the oxidation time. To clarify the rate‐limited step of TEMPO/laccase/O2 oxidation of cellulose, the academically accepted oxidation process is divided into individual pathways. A series of experiments is conducted with laccase and the three forms of organocatalyst (TEMPO, oxoammonium (TEMPO+), and hydroxylamine (TEMPOH)) to simulate individual reactions and calculate the reaction rates. The concentrations of TEMPO and oxoammonium are monitored by EPR spectroscopy. The oxidation rate of TEMPO by laccase varies at different pH conditions, and laccase activity is much higher at pH 4.5. Other reactions without laccase involved express a higher reaction rate when the pH value increased. TEMPO is mainly regenerated through a comproportionation reaction between oxoammonium and hydroxylamine. The acceleration of TEMPO regeneration by laccase is not obvious. The results indicate that the rate‐limited reaction in TEMPO/laccase/O2 oxidation is cellulose oxidation by TEMPO+.

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Chitin nanocrystals prepared by oxidation of α-chitin using the O2/laccase/TEMPO system

Cited by 70 publications

References 32 publications

Deconstruction and Reassembly of Renewable Polymers and Biocolloids into Next Generation Structured Materials

Deconstruction and Reassembly of Renewable Polymers and Biocolloids into Next Generation Structured Materials

Recent Progress in Preparation and Application of Nano‐Chitin Materials

Rate‐Limited Reaction in TEMPO/Laccase/O₂ Oxidation of Cellulose

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Chitin nanocrystals prepared by oxidation of α-chitin using the O2/laccase/TEMPO system

Cited by 70 publications

References 32 publications

Deconstruction and Reassembly of Renewable Polymers and Biocolloids into Next Generation Structured Materials

Deconstruction and Reassembly of Renewable Polymers and Biocolloids into Next Generation Structured Materials

Recent Progress in Preparation and Application of Nano‐Chitin Materials

Rate‐Limited Reaction in TEMPO/Laccase/O2 Oxidation of Cellulose

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Rate‐Limited Reaction in TEMPO/Laccase/O₂ Oxidation of Cellulose