Physicochemical Properties of Chitosan from Green Mussel Shells (Perna viridis): A Comparative Study

Kaewprachu, Pimonpan; Jaisan, Chalalai

doi:10.3390/polym15132816

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…It can be attributed to the absorption bands at 700, 712, 862, 1084, and 1466 cm -1 (50). The band at 2924 cm -1 is probably due to the presence of chitosan in the shell and in the periostracum attached to it (51). The bands between 3000-3600 cm -1 are attributed to hydroxyl groups and adsorbed water.…”

Section: Resultsmentioning

confidence: 99%

“…The aragonite phase is observed in all spectra (FTIR and FTIR-ATR) of L. fortunei and P. perna by the absorption bands at 700, 712, 862, 1084 and 1466 cm -1 . The band at 2924 cm -1 can be attributed to the chitosan (51) present in the shell. The band from 3000 to 3600 cm -1 is associated with the vibration of hydroxyl (OH-), but also with adsorbed water.…”

Section: Discussionmentioning

confidence: 99%

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Dissolution of Phosphate and Precipitation of Carbonate in the Biomineralization of the Bivalve Shell Limnoperna fortunei

Valadão Cardoso,

Novaes Ferreira

2024

Preprint

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The mantle of bivalves plays a crucial role in the formation and maintenance of their shells through biomineralization. Detailed studies using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis have revealed the presence of phosphorus (P) compounds as the primary phase during biomineralization at the growing edge of the periostracum of the bivalve shell Limnoperna fortunei (Dunker, 1857). The presence of a crystal morphology like hydroxyapatite (HAp) at the growing edge of the shell has also been identified, and the Ca/P ratio compatible with HAp. Carbonic anhydrase (CA), whose presence in the shell was investigated in this work, and/or bivalve proteins with identical capability are likely responsible for the dissolution phosphate and calcium carbonate precipitation. Other experimental techniques (ICP-OES, WDXRF) were used to quantify the main chemical elements in the shell of L. fortunei and the marine bivalve P. perna. The concentration of P in the shells suggests that phosphate is confined to the growing regions. FTIR and FTIR-ATR spectroscopies indicate aragonite as the main phase at the shell edges but also show the presence of phosphate absorption bands. X-ray diffraction (XRD) analyses revealed aragonite and calcite phases at the shell edges, with the presence of one of the main peaks of crystalline calcium phosphate both in L. fortunei and P. perna. The presence of phosphate as the primary phase in the biomineralization process of L. fortunei rekindles the discussion about the importance of the co-occurrence of phosphate and carbonate in the bivalve biomineralization dynamics and suggests an important evolutionary advantage in acquiring phosphate compounds essential for energy production and organism function.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Dissolution of Phosphate and Precipitation of Carbonate in the Biomineralization of the Bivalve Shell Limnoperna fortunei

Valadão Cardoso,

Novaes Ferreira

2024

Preprint

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Silane functionalized cardanol/calcium carbonate epoxy‐reinforced polymer nanocomposites for sustainable microwave absorption applications

Sathish Kumar,

Mandhakini,

Jeferson

et al. 2024

Polymer Composites

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Microwave absorption properties of epoxy resin/cardanol (ER/C) and epoxy resin/silane functionalized cardanol (ER/SFC) nanocomposites with various percentages of calcium carbonate nanoplatelets (CCNPs) studied in the frequency range of 8–18 GHz. The CCNPs obtained from the mussel shell were reinforced into a cardanol‐toughened ER matrix to mimic the composite structure of the abalone shell. The phase separation between ER, SFC, and CCNPs encapsulated in a polymer matrix was analyzed with SEM, and the presence of a low level of Fe3O4 magnetic impurities of 0.007 emu/g present as shown and verified by XRD and VSM analyses. The nanocomposites with ER/SFC/CCNPs 3 wt.% demonstrate a high surface roughness of 3.467 nm and an enhanced hydrophobicity, as indicated by a high contact angle of 102°. The silanization‐induced localization of CCNPs facilitates a mutually conducive morphology for excellent viscoelastic and microwave absorption properties. The increase in damping factor ratio of approximately 0.85 augments the microwave absorption property and it observed that ER/SFC/CCNPs 3 wt.% nanocomposites show higher reflection loss (RL) of more than 99.9% with RL of −43 dB at 12 GHz. The research aims to fabricate cost‐effective and multifunctional nanocomposites for microwave absorption applications.Highlights Excellent hydrophobicity owing to the surface roughness of 3.467 nm. Maximum contact angle of 102.1° due to the reinforcement of CCNPs and SFC to the epoxy matrix. Efficient microwave attenuation due to the reflection loss of −43 dB. Excellent microwave absorption of 99.99% with a damping factor of 0.85. Higher storage modulus due to the strong inter‐penetrating network of the composite.

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Facile Synthesis and Characterization of Chitosan Nanoparticles from Archachatina marginata Shell as Potential Solution to Antimicrobial Resistance

Atanda,

Shaibu,

Agunbiade

et al. 2024

BioNanoSci.

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Physicochemical Properties of Chitosan from Green Mussel Shells (Perna viridis): A Comparative Study

Cited by 4 publications

References 28 publications

Dissolution of Phosphate and Precipitation of Carbonate in the Biomineralization of the Bivalve Shell Limnoperna fortunei

Dissolution of Phosphate and Precipitation of Carbonate in the Biomineralization of the Bivalve Shell Limnoperna fortunei

Silane functionalized cardanol/calcium carbonate epoxy‐reinforced polymer nanocomposites for sustainable microwave absorption applications

Facile Synthesis and Characterization of Chitosan Nanoparticles from Archachatina marginata Shell as Potential Solution to Antimicrobial Resistance

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