Biocatalyzed route for the preparation of surface-deacetylated chitin nanofibers

Ye, Wenbo; Ma, Huazhong; Liu, Liang; Yu, Juan; Lai, Jiangli; Fang, Yiwu; Fan, Yimin

doi:10.1039/c9gc00857h

Cited by 32 publications

(20 citation statements)

References 53 publications

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“…Because chitosan is protonated in aqueous acid, nanofibers from partially deacetylated chitin can be easily individualized at pH 3−4 as a result of cationic repulsion of the positively charged amino group. 211 An alternative approach to controlled deacetylation was introduced recently by Ye et al, 212 namely the use of chitin deacetylase enzyme that enabled effortless isolation of ChNFs with widths between 25 and 45 nm. The degree of deacetylation could be controlled with the addition of different metal ions.…”

Section: Biomacromoleculesmentioning

confidence: 99%

Nanomaterials Derived from Fungal Sources—Is It the New Hype?

et al. 2019

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Greener alternatives to synthetic polymers are constantly being investigated and sought after. Chitin is a natural polysaccharide that gives structural support to crustacean shells, insect exoskeletons, and fungal cell walls. Like cellulose, chitin resides in nanosized structural elements that can be isolated as nanofibers and nanocrystals by various top-down approaches, targeted at disintegrating the native construct. Chitin has, however, been largely overshadowed by cellulose when discussing the materials aspects of the nanosized components. This Perspective presents a thorough overview of chitin-related materials research with an analytical focus on nanocomposites and nanopapers. The red line running through the text emphasizes the use of fungal chitin that represents several advantages over the more popular crustacean sources, particularly in terms of nanofiber isolation from the native matrix. In addition, many β-glucans are preserved in chitin upon its isolation from the fungal matrix, enabling new horizons for various engineering solutions.

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Section: Biomacromoleculesmentioning

confidence: 99%

Nanomaterials Derived from Fungal Sources—Is It the New Hype?

et al. 2019

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“…Through the abovementioned analysis, we can conclude that 80 °C is a relatively moderate treatment temperature, and we further characterized the esterification effect by FTIR at 80 °C. At the same time, the carboxylate content of all samples was also determined by the electrical conductivity titration method according to a previous report. , Figure a shows the FTIR spectra of PSS and chitin pretreated with different oxalic acid concentrations at 80 °C. The characteristic peaks of α-chitin are maintained, of which 1652 and 1623 cm –1 belong to the amide bands and 1558 cm –1 belongs to the amide II band .…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the carboxylate content of all samples was also determined by the electrical conductivity titration method according to a previous report. 50,51 Figure 5a shows the FTIR spectra of PSS and chitin pretreated with different oxalic acid concentrations at 80 °C.…”

Section: Resultsmentioning

confidence: 99%

One-Step Preparation of Chitin Nanofiber Dispersion in Full pH Surroundings Using Recyclable Solid Oxalic Acid and Evaluation of Redispersed Performance

Liu

et al. 2021

Biomacromolecules

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This study proposed an efficient and economical preparation pathway from purified chitin to nanofibers that can be dispersed in full pH surroundings. Recyclable oxalic acid was applied to prepare chitin nanofibers in a mild environment along with concurrent modifications of the carboxylic groups on the surface. Pretreatment with oxalic acid significantly improved the mechanical disintegration of chitin into nanofibers, the length of nanofibers reached ∼1100 nm, and the crystallinity and thermal stability of the chitin were basically unchanged with mild treatment. Oxalic acid can be reused many times with a high recovery of over 91%. Most importantly, the obtained nanofibers can be fabricated into films and hydrogels with certain mechanical properties, which can be redispersed into nanofibers using mild mechanical treatment. This method not only produces nanofibers in a green, reusable system but also provides a reference for the potential application of chitin nanofibers in commercial transportation and wide applicability.

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“…Therefore, highly efficient and green isolation processes (e.g., urea-based hydrothermal treatment and others) still yield a low total ChNF < 5%. [252] Considering the low yield and harsh conditions often applied for isolation, efforts are in development to isolate biocolloids, including enzymatic routes to modify (deacetylate) chitin, [262,263] fractionation with acidic deep eutectic solvents, [260] and ball-milling pretreatments. [264] Process engineering simulation has been used to assess the techno-economic feasibility of ChNF and ChNC isolation from purified chitin.…”

Section: Nanochitinsmentioning

confidence: 99%

The Food–Materials Nexus: Next Generation Bioplastics and Advanced Materials from Agri‐Food Residues

et al. 2021

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The most recent strategies available for upcycling agri‐food losses and waste (FLW) into functional bioplastics and advanced materials are reviewed and the valorization of food residuals are put in perspective, adding to the water–food–energy nexus. Low value or underutilized biomass, biocolloids, water‐soluble biopolymers, polymerizable monomers, and nutrients are introduced as feasible building blocks for biotechnological conversion into bioplastics. The latter are demonstrated for their incorporation in multifunctional packaging, biomedical devices, sensors, actuators, and energy conversion and storage devices, contributing to the valorization efforts within the future circular bioeconomy. Strategies are introduced to effectively synthesize, deconstruct and reassemble or engineer FLW‐derived monomeric, polymeric, and colloidal building blocks. Multifunctional bioplastics are introduced considering the structural, chemical, physical as well as the accessibility of FLW precursors. Processing techniques are analyzed within the fields of polymer chemistry and physics. The prospects of FLW streams and biomass surplus, considering their availability, interactions with water and thermal stability, are critically discussed in a near‐future scenario that is expected to lead to next‐generation bioplastics and advanced materials.

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Biocatalyzed route for the preparation of surface-deacetylated chitin nanofibers

Abstract: Schematic diagram of a novel approach to prepare chitin nanofibers via CDA.

Cited by 32 publications

References 53 publications

Nanomaterials Derived from Fungal Sources—Is It the New Hype?

Nanomaterials Derived from Fungal Sources—Is It the New Hype?

One-Step Preparation of Chitin Nanofiber Dispersion in Full pH Surroundings Using Recyclable Solid Oxalic Acid and Evaluation of Redispersed Performance

The Food–Materials Nexus: Next Generation Bioplastics and Advanced Materials from Agri‐Food Residues

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