What happens when chitin becomes chitosan? A single-molecule study

Lu, Qian; Zhang, Kai; Guo, Xin; Yu, Miao

doi:10.1039/d2ra07303j

Cited by 10 publications

(3 citation statements)

References 66 publications

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“…This model is suitable for fitting the experimental F – E curve of a polymer chain in an undisturbed environment. [ 39 ]…”

Section: Theoretical Calculationmentioning

confidence: 99%

Revealing the Effect of the Length of Chains on Rubber Mechanical Properties by the Two‐Component Quantum Mechanical Gaussian Model

Zhang,

Cao

2024

Macro Chemistry & Physics

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The special mechanical properties of natural rubber originate from the stretching of the network chains (i.e., cis‐1,4‐polyisoprene chains) in the rubber network. The chains with various lengths exhibit various relative extensions, leading to various normalized energy contributions to the mechanical properties of rubber. However, the stretching behaviors of cis‐1,4‐polyisoprene chains with different lengths are not studied clearly. Here in this study, the stretching behavior, which is the basis for analyzing the normalized energy contribution, is obtained by the modified freely jointed chain model. Next, using a new statistical model (TCQMG model), the relative extension‐length relationship of network chains is determined. Combining the above results, the energy contributions of network chains with different lengths are analyzed. The results show that long and short chains show different stretching states. The following can be explained by these results: short chains play an important role in the mechanical properties of rubber. As the network chain density increases, the average length of the chains decreases, leading to the variation of the normalized extensions. It is found that the variation of the normalized extensions is responsible for both the effects of the network chain density and network chain length on the mechanical properties of rubber.This article is protected by copyright. All rights reserved

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“…This model is suitable for fitting the experimental F – E curve of a polymer chain in an undisturbed environment. [ 39 ]…”

Section: Theoretical Calculationmentioning

confidence: 99%

Revealing the Effect of the Length of Chains on Rubber Mechanical Properties by the Two‐Component Quantum Mechanical Gaussian Model

Zhang,

Cao

2024

Macro Chemistry & Physics

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“…However, few research efforts have focused on the molecular properties of chitin and chitosan in diluted solution with variable pH. Atomic force microscope (AFM) based single-molecule force spectroscopy (SMFS) has shown impressive abilities in investigating the intra/intermolecular interactions of natural or synthetic polymers at the single-molecule level [22,23,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. Especially, the mechanical behaviors of single cellulose and amylose in aqueous environments were systematically studied by Cui et al, which provides a paradigm for the analysis of intramolecular and intermolecular interactions of polysaccharides with a similar backbone [32,35,39].…”

Section: Introductionmentioning

confidence: 99%

“…Especially, the mechanical behaviors of single cellulose and amylose in aqueous environments were systematically studied by Cui et al, which provides a paradigm for the analysis of intramolecular and intermolecular interactions of polysaccharides with a similar backbone [32,35,39]. Recently, the relationship between the structural features and mechanical behaviors of chitin and chitosan in DI water were investigated by Qian et al via SMFS [42,43]. The authors claim that the deacetylation from chitin to chitosan will increase the number of binding water molecules (solubility) around the chain, further increasing the binding water energy of a single chain.…”

Section: Introductionmentioning

confidence: 99%

Effect of Environmental pH on the Mechanics of Chitin and Chitosan: A Single-Molecule Study

Zhang,

Ji,

et al. 2024

Polymers

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Chitin and chitosan are important structural macromolecules for most fungi and marine crustaceans. The functions and application areas of the two molecules are also adjacent beyond their similar molecular structure, such as tissue engineering and food safety where solution systems are involved. However, the elasticities of chitin and chitosan in solution lack comparison at the molecular level. In this study, the single-molecule elasticities of chitin and chitosan in different solutions are investigated via atomic force microscope (AFM) based single-molecule spectroscopy (SMFS). The results manifest that the two macromolecules share the similar inherent elasticity in DOSM due to their same chain backbone. However, obvious elastic deviations can be observed in aqueous conditions. Especially, a lower pH value (acid environment) is helpful to increase the elasticity of both chitin and chitosan. On the contrary, the tendency of elastic variation of chitin and chitosan in a larger pH value (alkaline environment) shows obvious diversity, which is mainly determined by the side groups. This basic study may produce enlightenment for the design of intelligent chitin and chitosan food packaging and biomedical materials.

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Properties and Performance of Biopolymers in Textile Applications

Hossain,

Akter,

Nanjeba

et al. 2024

Biopolymers in the Textile Industry

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What happens when chitin becomes chitosan? A single-molecule study

Abstract: Single molecule studies showed that the hydrogen (H)-bonds'state, which can be influenced by the solvent, determines the degree of binding water of polysaccharides.

Cited by 10 publications

References 66 publications

Revealing the Effect of the Length of Chains on Rubber Mechanical Properties by the Two‐Component Quantum Mechanical Gaussian Model

Revealing the Effect of the Length of Chains on Rubber Mechanical Properties by the Two‐Component Quantum Mechanical Gaussian Model

Effect of Environmental pH on the Mechanics of Chitin and Chitosan: A Single-Molecule Study

Properties and Performance of Biopolymers in Textile Applications

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