Chitosan membrane as a template for hydroxyapatite crystal growth in a model dual membrane diffusion system

Ehrlich, Hermann; Krajewska, Barbara; Hanke, Thomas; Born, R.; Heinemann, Sascha; Knieb, Christiane; Worch, H.

doi:10.1016/j.memsci.2005.11.050

Cited by 67 publications

(47 citation statements)

References 27 publications

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“…Mineral phases were identified using FTIR as described by us previously. 21,31 Structural Analysis Structural analysis of the collagen fibrils before and after mineralization was performed using scanning electron microscopy (SEM) (ESEM XL 30, Philips) and transmission electron microscopy (Tecnai 10, FEI company, Eindhoven, NL). Additional transmission electron microscopy experiments were carried out at the Leibniz Institute for Solid State and Materials Research Dresden by means of a Tecnai F30 microscope.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

“…Crystalline phase well seen in Figure 4 was identified using FTIR (data not shown here) as HAP (characteristic bands at 633 cm 21 corresponding to OH librations, at 1026, 1106 and 961 cm -1 resulting from phosphate stretching vibrations, at 604 and 563 cm -1 resulting from phosphate bending vibrations as described by us previously). 21,31 To evaluate the mineralized CML containing collagen fibrils more detailed, and to discern the relative orientation of the HAP crystals with respect to collagen fibrils, TEM, HR-TEM, and electron diffraction investigations ( Figure 5) have also been carried out. HR-TEM analyses were performed in Figure 5(B).…”

Section: In Vitro Mineralization Of Collagen Fibrilsmentioning

confidence: 99%

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Carboxymethylation of the fibrillar collagen with respect to formation of hydroxyapatite

et al. 2009

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Control over crystal growth by acidic matrix macromolecules is an important process in the formation of many mineralized tissues. Highly acidic macromolecules are postulated intermediates in tissue mineralization, because they sequester many calcium ions and occur in high concentrations at mineralizing foci in distantly related organisms. A prerequisite for biomineralization is the ability of cations like calcium to bind to proteins and to result in concert with appropriate anions like phosphates or carbonates in composite materials with bone-like properties. For this mineralization process the proteins have to be modified with respect to acidification. In this study we modified the protein collagen by carboxymethylation using glucuronic acid. Our experiments showed unambigously, that N(epsilon)-carboxymethyllysine is the major product of the in vitro nonenzymatic glycation reaction between glucuronic acid and collagen. We hypothesized that the function of biomimetically carboxymethylated collagen is to increase the local concentration of corresponding ions so that a critical nucleus of ions can be formed, leading to the formation of the mineral. Thus, the self-organization of HAP nanocrystals on and within collagen fibrils was intensified by carboxymethylation.

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Section: Ftir Spectroscopymentioning

confidence: 99%

Section: In Vitro Mineralization Of Collagen Fibrilsmentioning

confidence: 99%

Carboxymethylation of the fibrillar collagen with respect to formation of hydroxyapatite

et al. 2009

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“…The supports can be either synthetic materials (mainly silicas) [11,12] or natural ones such as chitin and chitosan [13][14][15]. They are also characterized by high stability, well-developed surface area, and the possibility of surface functionalization with many modifying compounds [16,17].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Amano Lipase A onto Stöber silica surface: process characterization and kinetic studies

Zdarta

Sałek

Kołodziejczak-Radzimska

et al. 2014

Open Chemistry

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The immobilization of Amano Lipase A fromAspergillus niger by adsorption onto Stöber silica matrix obtained by sol-gel method was studied. The effectiveness of the enzyme immobilization and thus the usefulness of the method was demonstrated by a number of physicochemical analysis techniques including Fourier Transform Infrared Spectroscopy (FT-IR), elemental analysis (EA), thermogravimetric analysis (TG), porous structure of the support and the products after immobilization from the enzyme solution with various concentration at different times. The analysis of the process' kinetics allowed the determination of the sorption parameters of the support and optimization of the process. The optimum initial concentration of the enzyme solution was found to be 5 mg mL -1 , while the optimum time of the immobilization was 120 minutes. These values of the variable parameters of the process were obtained by as ensuring the immobilization of the largest possible amount of the biocatalyst at the most economically beneficial aspects of the process.

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“…As such, optimal templates can be selected to address the dimensions and biocompatibility. Materials including poly(lactic-coglycolic acid) (PLGA) [474], polycaprolactone (PCL) [475], polyethylene glycol (PEG)-poly(2-hydroxyethyl methacrylate) (pHEMA) [476], chitosan [477], hydroxyapatite [478], and bioglasses [479] with low content of SiO 2 are designed and prepared through templating.…”

Section: Scaffolds and Membranesmentioning

confidence: 99%

Template-based syntheses for shape controlled nanostructures

Pérez-Page

et al. 2016

Advances in Colloid and Interface Science

129

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A variety of nanostructured materials are produced through template-based synthesis methods, including zerodimensional, one-dimensional, and two-dimensional structures. These span different forms such as nanoparticles, nanowires, nanotubes, nanoflakes, and nanosheets. Many physical characteristics of these materials such as the shape and size can be finely controlled through template selection and as a result, their properties as well. Reviewed here are several examples of these nanomaterials, with emphasis specifically on the templates and synthesis routes used to produce the final nanostructures. In the first section, the templates have been discussed while in the second section, their corresponding synthesis methods have been briefly reviewed, and lastly in the third section, applications of the materials themselves are highlighted. Some examples of the templates frequently encountered are organic structure directing agents, surfactants, polymers, carbon frameworks, colloidal sol-gels, inorganic frameworks, and nanoporous membranes. Synthesis methods that adopt these templates include emulsion-based routes and template-filling approaches, such as self-assembly, electrodeposition, electroless deposition, vapor deposition, and other methods including layer-by-layer and lithography. Templatebased synthesized nanomaterials are frequently encountered in select fields such as solar energy, thermoelectric materials, catalysis, biomedical applications, and magnetowetting of surfaces.

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Chitosan membrane as a template for hydroxyapatite crystal growth in a model dual membrane diffusion system

Cited by 67 publications

References 27 publications

Carboxymethylation of the fibrillar collagen with respect to formation of hydroxyapatite

Carboxymethylation of the fibrillar collagen with respect to formation of hydroxyapatite

Immobilization of Amano Lipase A onto Stöber silica surface: process characterization and kinetic studies

Template-based syntheses for shape controlled nanostructures

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