Structure and interactions of calcite spherulites with α-chitin in the brown shrimp (Penaeus aztecus) shell

Heredia, Alejandro; Aguilar-Franco, Manuel; Magaña, Carlos; Flores, Carolina; Pina, Carlos M.; Velázquez, Rubén; Schäffer, Tilman E.; Bucio, L.; Basiuk, Vladimir A.

doi:10.1016/j.msec.2005.11.003

Cited by 18 publications

(15 citation statements)

References 15 publications

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“…9 . CaCO 3 crystalline diffraction peaks are shown in the virgin samples at 27.32, 33.23, 36.29 and 43.07 (Heredia et al 2007 ; Mikkelsen et al 1997 ). These peaks are absent in the extracted chitin showing that the treatment was successful in removing CaCO 3 from the shells.…”

Section: Resultsmentioning

confidence: 99%

“…The figure shows that prominent chitin peaks were developed after treatments. The diffraction peaks at 27.07, 35.84 and 42.72 in the virgin sample are crystalline diffractions from calcite (Mikkelsen et al 1997 ; Heredia et al 2007 ). These peaks are not present in the treated samples, showing that the treatment was successful in removing CaCO 3 from the shells.…”

Section: Resultsmentioning

confidence: 99%

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Thermal, structural and acetylation behavior of snail and periwinkle shells chitin

2017

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This article reports a successful removal of CaCO3 from snail and periwinkle shells for the purpose of producing high quality chitin for possible application as bio-fillers in bone fixation materials. Experiment was designed with varying concentrations of acid and alkali for demineralization, deproteinization and deacetylation of the samples. Thermal characteristics, morphology, degree of de-acetylation, crystalline structure and hydrogen bonding characteristics of the extracted chitin were examined. Infra-red spectra, thermogravimetric analysis and X-ray diffraction patterns show that demineralization with 1.7 M HCl led to a successful removal of CaCO3. Subsequent deproteinization and deacetylation with 1.2 M NaOH led to a development of chitosan having a degree of deacetylation of 77 and 60% for periwinkle and snail shells, respectively. Generally, all results show that different treatments led to different chitin structure and consequently different properties.Electronic supplementary materialThe online version of this article (doi:10.1007/s40204-017-0070-1) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Thermal, structural and acetylation behavior of snail and periwinkle shells chitin

2017

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“…5 Å distance). By selecting (Selection Tool) the former and leaving the latter deselected, the surface fragment was frozen (as the simplest approach to simulate a crystal plane) [30], and only the peptide geometry was optimized. Geometry optimization was performed with the Polak-Ribiere conjugate gradient algorithm and a root mean square (RMS) gradient of 0.01 kcal Å…”

Section: Molecular Modelingmentioning

confidence: 99%

Thermal, infrared spectroscopy and molecular modeling characterization of bone: An insight in the apatite-collagen type I interaction

Heredia¹,

Colín-García²,

Peña‐Rico³

et al. 2013

ABC

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An insight into the interaction of collagen type I with apatite in bone tissue was performed by using differential scanning calorimetry, Fourier transform infrared spectroscopy, and molecular modeling. Scanning electron microscopy shows that bone organic content incinerate gradually through the different temperatures studied. We suggest that the amide regions of the type I collagen molecule (mainly C=O groups of the peptide bonds) will be important in the control of the interactions with the apatite from bone. The amide I infrared bands of the collagen type I change when interacting to apatite, what might confirm our assumption. Bone tissue results in a loss of thermal stability compared to the collagen studied apart, as a consequence of the degradation and further combustion of the collagen in contact with the apatite microcrystals in bone. The thermal behavior of bone is very distinctive. Its main typical combustion temperature is at 360˚C with a shoulder at 550˚C compared to the thermal behavior of collagen, with the mean combustion peak at ca. 500˚C. Our studies with molecular mechanics (MM+ force field) showed different interaction energies of the collagen-like molecule and different models of the apatite crystal planes. We used models of the apatite (100) and (001) planes; additional two planes (001) were explored with phosphate-rich and calcium-rich faces; an energetic preference was found in the latter case. We preliminary conclude that the peptide bond of collagen type I is modified when the molecule interacts with the apatite, producing a decrease in the main peak from ca. 500˚C in collagen, up to 350˚C in bone. The combustion might be related to collagen type I, as the ΔH energies present only small variations between mineralized and non-mineralized samples. The data obtained here give a molecular perspective into the structural properties of bone and the change in collagen properties caused by the interaction with the apatite. Our study can be useful to understand the biological synthesis of minerals as well as the organic-inorganic interaction and the synthesis of apatite implant materials.

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“…X-ray structural parameters from alginate powder shows a very crystalline material corresponding tocristobalite crystalline solid (Figure 2). In the case the IR spectra, they show the characteristics set of SiO 2 bands from biosilica [33], alginate [40] [41] and chitin [42] [43]. Concretely, the band at 3437 cm −1 is due to the stretching vibration of -OH group and correspondingly, the IR band at ca.1617 cm confirms the presence of this molecule in diatom biosilica as described already [45].…”

Section: C) These Results Contrast With the Experimental Values (Linmentioning

confidence: 74%

Description of New Bioelectromechanical Properties in Alginate: An Insight with a Computer Simulation

Heredia¹,

Gervacio-Arciniega²,

Duarte-Alaniz³

et al. 2017

AMPC

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Alginate biopolymer from Tropicalgin C302245 was studied by means of piezoresponse force microscopy imaging, scanning electron microscopy, powder X-rays, infrared spectroscopy and computer simulations. Local piezoresponse force microscopy images show possible ferroelectric domains detected in the out of plane mode and these results are confirmed by the second harmonic generation analysis. Alginate powder is composed by diatom frustules containing a cristobalite-like compound, amorphous silica and chitin. The experimental results are explained by MM+ and PM3 computer simulations that establish that the self-assembly of the alginate molecules enhance the polarization increasing the molecular collective dipole moment. Alginate molecular properties might open interesting possibilities for organic technological applications.

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Structure and interactions of calcite spherulites with α-chitin in the brown shrimp (Penaeus aztecus) shell

Cited by 18 publications

References 15 publications

Thermal, structural and acetylation behavior of snail and periwinkle shells chitin

Thermal, structural and acetylation behavior of snail and periwinkle shells chitin

Thermal, infrared spectroscopy and molecular modeling characterization of bone: An insight in the apatite-collagen type I interaction

Description of New Bioelectromechanical Properties in Alginate: An Insight with a Computer Simulation

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