Biomimetic Silicification of Fibrous Chitin from Diatoms

Spinde, Katrin; Kammer, Martin; Freyer, Katja; Ehrlich, Hermann; Vournakis, John N.; Brunner, Eike

doi:10.1021/cm200677d

Cited by 70 publications

(35 citation statements)

References 68 publications

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“…It is worth noting that a band associated with glycosidic bonds in α-chitin standard is shifted in the spectrum of chitin/Fe 2 O 3 from 896 cm -1 to 891 cm -1 . This shift is a clear example of hydrogen bond formation between chitin and Fe 2 O 3 ; and is similar to that seen previously for chitin-silica [54][55] and chitin zirconia composites [5]. Additionally, the observed shifts of amide II bands is probably are the result of the degradation of hydrogen bonds responsible for the macromolecular organization of chitin which are presumably disrupted upon hematite incorporation (Figures 4 and 6).…”

Section: Discussionsupporting

confidence: 87%

Renewable chitin from marine sponge as a thermostable biological template for hydrothermal synthesis of hematite nanospheres using principles of extreme biomimetics

Wysokowski

Petrenko

Motylenko

et al. 2015

Bioinspired Materials

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range of uses. Here, chitin-based scaffolds isolated from the skeleton of marine demosponge Aplysina aerophoba were used as a template for the in vitro formation of iron oxide from a saturated iron(III) chloride solution, under hydrothermal conditions (pH~1.5, 90 °C). The resultant chitin-Fe 2 O 3 three dimensional composites, prepared for the first time via hydrothermal synthesis route, were thoroughly characterized using light, fluorescence and scanning electron microscopy; as well as with analytical methods like Raman spectroscopy, electron diffraction and HR-TEM. The results show that this versatile method allows for efficient chitin mineralization with respect to hematite. Additionally, we demonstrate that chitin nanofibers template the nucleation of uniform Fe 2 O 3 nanocrystals.

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Section: Discussionsupporting

confidence: 87%

Renewable chitin from marine sponge as a thermostable biological template for hydrothermal synthesis of hematite nanospheres using principles of extreme biomimetics

Wysokowski

Petrenko

Motylenko

et al. 2015

Bioinspired Materials

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“…In particular, the 2D and 3D nanostructural biocomposite-based scaffolds are crucial for a broad variety of advanced applications [147,148]. Biomimetic synthesis of materials is carried out with various biomolecules; especially enzymes [146], proteins [149,150] peptides [151,152] and polysaccharides [153][154][155][156][157]. These biomacromolecules play an important role in nucleation, thermodynamic and kinetic control of crystal growth, and also can be used as soft templates for inorganic structures [143].…”

Section: Chitin and Extreme Biomimeticsmentioning

confidence: 99%

“…These biomacromolecules play an important role in nucleation, thermodynamic and kinetic control of crystal growth, and also can be used as soft templates for inorganic structures [143]. However, traditionally, approaches related to the in vitro biomimetic mineralization of organic templates are carried out at temperatures between 20 and 37 °C and at near-neutral pH [149][150][151][152][153][154][155][156][157][158]. It is assumed that biological materials, especially protein-based ones, are not stable at temperatures higher than 40 °C.…”

Section: Chitin and Extreme Biomimeticsmentioning

confidence: 99%

“…It was also observed that nanosilica infiltrated into the nanoorgnized fibers of our chitin scaffold; this is marked by an arrow and can be easily seen in Figure 3. Analysis of FTIR and Raman spectra suggest that the chitin scaffold interacts with silica by hydrogen bond formation; especially at the C(6) position [157,161,186]. The results of the hydrothermal silicification of chitin open new possibilities for synthesis of chitin-silica composites, which gain particular interest in the development of bone substitutes for tissue engineering [77,187]; waste water treatment [188], and drug delivery systems [189].…”

Section: Extreme Biomimetics: Development Of Chitin-based Inorganic-omentioning

confidence: 99%

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Poriferan Chitin as a Versatile Template for Extreme Biomimetics

et al. 2015

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Abstract:In this mini-review, we shall first cover a short history of the discovery of chitin isolated from sponges; as well as its evolutionarily ancient roots. Next, we will delve into the unique structural, mechanical, and thermal properties of this naturally occurring polymer to illuminate how its physicochemical properties may find uses in diverse areas of the material sciences. We show how the unique properties and morphology of sponge chitin renders it quite useful for the new route of "Extreme Biomimetics"; where high temperatures and pressures allow a range of interesting bioinorganic composite materials to be made. These new biomaterials have electrical, chemical, and material properties that have applications in water filtration, medicine, catalysis, and biosensing. OPEN ACCESSPolymers 2015, 7 236

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“…Weak, red auto fluorescence has been observed from chitin exoskeletons in insects [39] . Polysaccharides such as chitin [40] , [41] , callose [25] and LPCAs [23] are associated with frustule construction, and some are even integrated into the biosilica structure during formation. Degradation products of various organic compounds are often determined using fluorometric analyses: Chlorophyll easily degrades to pheophytin in contact with acids or increasing temperature, and pheophytin shows red fluorescens [42] .…”

Section: Microscopymentioning

confidence: 99%

Diatom frustules as a biomaterial: effects of chemical treatment on organic material removal and mechanical properties in cleaned frustules from two Coscinodiscus species

et al. 2016

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The three-dimensional structure of silica diatom frustules offers a great potential as nanoporous material for several nanotechnological applications, but the starting point for these applications is the ability to obtain clean frustules with sufficient mechanical strength and intact structure. Here, frustules from the diatoms Coscinodiscus centralis Ehrenberg and C. wailesii Gran et Angst are characterized with respect to their structural integrity, content of residual organic biomaterial and their mechanical properties after two cleaning methods using either hydrogen peroxide as oxidizing agent or a combination of a surfactant (sodium dodecyl sulphate) and a complexing agent. Fluorescence microscopy and energy dispersive spectroscopy (SEM/EDS) analysis revealed clear differences regarding the amount of organic residual within the frustules depending on the cleaning process, with little organic material left after the oxidizing method. This method, however, induced a partial cracking of the frustules suggesting an embrittlement due to the cleaning. Nanoindentation confirmed this and showed that the oxidizing method resulted in more brittle frustules compared to the surfactant/complexing method. More efficient cleaning of organic biomaterial may result in more fragile frustules, and the choice of cleaning method must be based on the planned application.

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Biomimetic Silicification of Fibrous Chitin from Diatoms

Cited by 70 publications

References 68 publications

Renewable chitin from marine sponge as a thermostable biological template for hydrothermal synthesis of hematite nanospheres using principles of extreme biomimetics

Renewable chitin from marine sponge as a thermostable biological template for hydrothermal synthesis of hematite nanospheres using principles of extreme biomimetics

Poriferan Chitin as a Versatile Template for Extreme Biomimetics

Diatom frustules as a biomaterial: effects of chemical treatment on organic material removal and mechanical properties in cleaned frustules from two Coscinodiscus species

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