Insights into the relationships of modifying methods, structure, functional properties and applications of chitin: A review

Hou, Furong; Gong, Zhiqing; Jia, Fengjuan; Cui, Wenjia; Song, Shasha; Zhang, Jian; Wang, Yansheng; Wang, Wenliang

doi:10.1016/j.foodchem.2022.135336

Cited by 14 publications

(9 citation statements)

References 117 publications

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“…Based on the results, in addition to α-chitin anisotropic behavior, it also exhibits orthotropic characteristics [56]. This specialized form of anisotropy is characterized by unique, mutually perpendicular principal material axes along which the mechanical properties are independent [57]. This orthotropic nature is inherent to its hierarchical molecular arrangement and lends itself to the complex biological functions it performs.…”

Section: Resultsmentioning

confidence: 93%

Mechanical Properties of α-Chitin and Chitosan Biocomposite: A Molecular Dynamic Study

Salavati

2023

J. Compos. Sci.

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This study investigates the mechanical properties of α-chitin and chitosan biocomposites using molecular dynamics (MD) and stress–strain analyses under uniaxial tensile loading in an aqueous environment. Our models, validated against experimental data, show that α-chitin has a higher directional elastic modulus of 51.76 GPa in the x and 39.76 GPa in the y directions compared to its chitosan biocomposite, with 31.66 GPa and 26.00 GPa in the same directions, demonstrating distinct mechanical behaviors between α-chitin and the biocomposite. The greater mechanical stiffness of α-chitin can be attributed to its highly crystalline molecular structure, offering potential advantages for applications requiring load-bearing capabilities. These findings offer valuable insights for optimizing these materials for specialized applications.

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Section: Resultsmentioning

confidence: 93%

Mechanical Properties of α-Chitin and Chitosan Biocomposite: A Molecular Dynamic Study

Salavati

2023

J. Compos. Sci.

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“…In this way, it makes the chitin difficult to thermally and wetly process along with its dense crystalline structure. Several efforts have been made to address the problems of chitin processing, including acylation, quaternization, alkylation, hydroxylation, and graft copolymerization. , Solvent treatment is considered one of the most efficient strategies to modify the chitin and prepare chitin-based composite materials, − depressing the interactions and contributing to the individualization of chitin. − Nasrin et al prepared a chitin-reinforced PLA composite film (CTP) using the solution casting method. Because of the poor dispersion of chitin in the PLA matrix, the tensile strength of CTP2 (5% chitin) was significantly reduced by almost 50% compared to the pure PLA film .…”

Section: Introductionmentioning

confidence: 99%

Solid-State Utilization of Chitin to Construct Flexible Films with Enhanced Biocompatibility and Mechanical Performance

Ye,

Wang,

Wang

et al. 2024

ACS Sustainable Chem. Eng.

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The resource utilization of biomass materials has ignited increasing interest owing to their renewability, biodegradability, and abundance. However, the most representative biomass materials, such as cellulose and chitin, are faced with challenges in terms of the difficulty of thermal processing and the inability of scalable production due to the strong hydrogen bonding between molecular chains. Herein, the large-sized chitin scraps were efficiently pulverized and exfoliated through solid-state shear milling (S 3 M) technology at room temperature. The strong shearing and squeezing force generated from the two pans could further induce the in situ compatibilization of chitin and another environmentally friendly polymer, poly(vinyl alcohol) (PVA). In this way, the flexible PVA/chitin composite film was successfully prepared via thermal processing, attributed to the plasticizing method and perfect film-forming performance of PVA. The ultrafine-pulverized and well-dispersed chitin could effectively promote cell adhesion and proliferation and further enhance the mechanical properties of the composite film in comparison to that without the S 3 M process. This work provides a facile and efficient strategy for solid-state and high-value utilization of biomass materials, for which the traditional processing approaches encounter challenges on a large scale.

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“…The mechanical properties of the cuticle can vary significantly between different regions and these heterogeneities determine the functions of specific structures in addition to the morphology. Whether a region is hard and stiff or soft and flexible depends on the thickness of the cuticle, the orientation of the chitin fibres, the degree of chitin fibre linkage through sclerotization, or the distribution of proteins and water [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Mandible elemental composition and mechanical properties from distinct castes of the leafcutter ant Atta laevigata (Attini; Formicidae)

Birkenfeld,

Gorb,

Krings

2024

Interface Focus.

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Leafcutter ant colonies are divided into castes with the individuals performing different tasks, based mostly on size. With the mandibles, the small minims care for the brood or the fungus, whereas the larger minors and mediae cut and transport plant material, with the ant size positively related to the material size. The mechanical properties and composition of the mandible cuticle have been previously tested in the soldiers as the largest caste, revealing that the cutting edges contained high contents of the cross-linking transition metal zinc (Zn). With regard to the smaller castes, no data are present. To study how the mandible size and function relates to its mechanical properties, we here tested the mandibles of minims, minors and mediae by nanoindentation. We found that the hardness (H) and Young's modulus (E) values increased with increasing ant size and that the mandible cutting edges in each caste have the highest H- and E-values. To gain insight into the origins of these properties, we characterized the elemental composition by energy-dispersive X-ray analysis, revealing that minors and mediae possessed higher content of Zn in the cutting edges in contrast to the minims containing significantly less Zn. This shows, that Zn content relates to higher mechanical property values. Additionally, it shows that all of these parameters can differ within a single species.

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Insights into the relationships of modifying methods, structure, functional properties and applications of chitin: A review

Cited by 14 publications

References 117 publications

Mechanical Properties of α-Chitin and Chitosan Biocomposite: A Molecular Dynamic Study

Mechanical Properties of α-Chitin and Chitosan Biocomposite: A Molecular Dynamic Study

Solid-State Utilization of Chitin to Construct Flexible Films with Enhanced Biocompatibility and Mechanical Performance

Mandible elemental composition and mechanical properties from distinct castes of the leafcutter ant Atta laevigata (Attini; Formicidae)

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