Improving the Ca(II) adsorption of chitosan via physical and chemical modifications and charactering the structures of the calcified complexes

Wei, Xunfan; Chen, Sicong; Rong, Jingjing; Sui, Zhuoxiao; Wang, Sijia; Lin, Yubo; Xiao, Jin‐Hua; Huang, Dawei

doi:10.1016/j.polymertesting.2021.107192

Cited by 27 publications

(4 citation statements)

References 50 publications

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“…The high-resolution spectra of Ca 2p showed peaks of Ca 2p 1/2 at 349.2 eV and Ca 2p 3/2 at 345.6 eV. This is compatible with the presence in all the samples with more or less quantities of calcium-chitosan complexes, as described by Wei et al (2021) [ 35 ].…”

Section: Resultssupporting

confidence: 85%

Deep Chemical and Physico-Chemical Characterization of Antifungal Industrial Chitosans—Biocontrol Applications

et al. 2023

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Five different chitosan samples (CHI-1 to CHI-5) from crustacean shells with high deacetylation degrees (>93%) have been deeply characterized from a chemical and physicochemical point of view in order to better understand the impact of some parameters on the bioactivity against two pathogens frequently encountered in vineyards, Plasmopara viticola and Botrytis cinerea. All the samples were analyzed by SEC-MALS, 1H-NMR, elemental analysis, XPS, FTIR, mass spectrometry, pyrolysis, and TGA and their antioxidant activities were measured (DPPH method). Molecular weights were in the order: CHI-4 and CHI-5 (MW >50 kDa) > CHI-3 > CHI-2 and CHI-1 (MW < 20 kDa). CHI-1, CHI-2 and CHI-3 are under their hydrochloride form, CHI-4 and CHI-5 are under their NH2 form, and CHI-3 contains a high amount of a chitosan calcium complex. CHI-2 and CHI-3 showed higher scavenging activity than others. The bioactivity against B. cinerea was molecular weight dependent with an IC50 for CHI-1 = CHI-2 (13 mg/L) ≤ CHI-3 (17 mg/L) < CHI-4 (75 mg/L) < CHI-5 (152 mg/L). The bioactivity on P. viticola zoospores was important, even at a very low concentration for all chitosans (no moving spores between 1 and 0.01 g/L). These results show that even at low concentrations and under hydrochloride form, chitosan could be a good alternative to pesticides.

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Section: Resultssupporting

confidence: 85%

Deep Chemical and Physico-Chemical Characterization of Antifungal Industrial Chitosans—Biocontrol Applications

et al. 2023

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“…P-Ch1, P-Ch2, and P-Ch3 gels with low or no calcium cross-links were found to have significantly less calcium than P-Ch0 gel. Although chitosan has little adsorption in relation to Ca 2+ , the latter can be complexed with -NH 2 , CH 3 CONH, and -OH groups of chitosan [52]. Therefore, the presence of calcium in gels containing chitosan may be due to the possible formation of Ca 2+ -chitosan complexes.…”

Section: Discussionmentioning

confidence: 99%

Effect of Chitosan on Rheological, Mechanical, and Adhesive Properties of Pectin–Calcium Gel

et al. 2023

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In the present study, chitosan was included in the pectin ionotropic gel to improve its mechanical and bioadhesive properties. Pectin–chitosan gels P–Ch0, P–Ch1, P–Ch2, and P–Ch3 of chitosan weight fractions of 0.00, 0.25, 0.50, and 0.75 were prepared and characterized by dynamic rheological tests, penetration tests, and serosal adhesion ex vivo assays. The storage modulus (G′) and loss modulus (G″) values, gel hardness, and elasticity of P–Ch1 were significantly higher than those of P–Ch0 gel. However, a further increase in the content of chitosan in the gel significantly reduced these parameters. The inclusion of chitosan into the pectin gel led to a decrease in weight and an increase in hardness during incubation in Hanks’ solution at pH 5.0, 7.4, and 8.0. The adhesion of P–Ch1 and P–Ch2 to rat intestinal serosa ex vivo was 1.3 and 1.7 times stronger, whereas that of P–Ch3 was similar to that of a P–Ch0 gel. Pre-incubation in Hanks’ solution at pH 5.0 and 7.4 reduced the adhesivity of gels; however, the adhesivity of P–Ch1 and P–Ch2 exceeded that of P–Ch0 and P–Ch3. Thus, serosal adhesion combined with higher mechanical stability in a wide pH range appeared to be advantages of the inclusion of chitosan into pectin gel.

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“…Pure chitin has a poor affinity for calcium (Tokura et al, 1983 ) due to the absence of ionic binding sites. Indeed, functional groups, which may coordinate cations such as hydroxyl groups (‐OH), and acetyl amino groups (‐NHCOCH 3 ) (Wei et al, 2021 ) are engaged in hydrogen bonding in crystalline chitin, making its surface inert. In Eukaryotic biomineralization systems, chitin typically forms a 2D or 3D scaffold for polyanionic polysaccharides or proteins that direct CaCO 3 nucleation and growth (Arias & Fernández, 2008 ; Ehrlich, 2010 ; Falini & Fermani, 2004 ), but it is unclear whether chitin fibrils excreted by diatoms are associated with other biomolecules that could bind Ca 2+ and nucleate CaCO 3 (e.g., Durkin et al, 2009 ), a question that deserves further investigation.…”

Section: Discussionmentioning

confidence: 99%

A re‐examination of the mechanism of whiting events: A new role for diatoms in Fayetteville Green Lake (New York, USA)

et al. 2022

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Improving the Ca(II) adsorption of chitosan via physical and chemical modifications and charactering the structures of the calcified complexes

Cited by 27 publications

References 50 publications

Deep Chemical and Physico-Chemical Characterization of Antifungal Industrial Chitosans—Biocontrol Applications

Deep Chemical and Physico-Chemical Characterization of Antifungal Industrial Chitosans—Biocontrol Applications

Effect of Chitosan on Rheological, Mechanical, and Adhesive Properties of Pectin–Calcium Gel

A re‐examination of the mechanism of whiting events: A new role for diatoms in Fayetteville Green Lake (New York, USA)

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