Chitosan matrix

Fig. 1.5 SEM micrographs of (A) donut-shaped poly(aspartate) and MgCl2 by alternate spin CaC03 crystals grown on polyacrylic acid grafted coating and crystallization. (A) and (B) adapted chitosan, (B) CaC03 hollow helix, fractured by from [84] and [85]with permission from Elsevier, micro-manipulation, formed on poly(a-L-aspar- and (C) from [88] (reproduced by permission of tate),and (C) double layered aragonitethin films The Royal Society of Chemistry), grown on a chitosan matrix in the presence of...

Y. Liu, M.K. Wang, F. Zhao, Z.A. Xu, and S.J. Dong, The direct electron transfer of glucose oxidase and glucose biosensor based on carbon nanotubes/chitosan matrix, Biosens. Bioelectron. 21, 984-988... 

I. Higuera-Ciapara, L. Felix-Valenzuela, F.M. Goycoolea and W. Arguelles-Monal, Microencapsulation of astaxanthin in a chitosan matrix. Carbohydr. Polym. 56 (2004) 41 45. 

Figure 1.18 SEM image oftheelectrodeposited gold nanowires in a chitosan matrix. (Reprinted with permission from Ref [72]. 2007 Elsevier.)...

The organic acids, sorbic, benzoic, and propionic acids, and anhy-drates have been proposed and tested for antimicrobial activity in edible films. Organic acids are also being applied as an edible film, together with essential oils, into a chitosan matrix (Ouattara et al., 2000). From here they are initially released quickly (with the high gradient of ion concentration between the inside of a polymer matrix and the environment) but more... 

Chitosan can form 3D scaffold that are too weak to be useful in tissue engineering. Hence, inclusion in the chitosan matrix and/or grafting onto chitosan of other substances such as collagen, other biopolymers, or hydroxyapatite has been achieved to improve the mechanical properties of the scaffold and to mimic the nanostructure of the tissue for a better cell adhesion/infiltration and/or to provide thermosensitivity for in situ gelation. 

Wang XH, Li DP, Wang WJ et al (2003) Crosslinked collagen/chitosan matrix for artificial fivers. Biomaterials 24 3213-3220... 

However, there are few reports on chitosan/bentonite nanocomposites (Yang Chen, 2007 Zhang et al., 2009 Wan Ngah et al., 2010). The physical properties and biological response of chitosan strongly depend on the starting materials and nanocomposite preparation conditions. In the present study chitosan/day nanocomposites were prepared using two kinds of clay and different chitosan/day ratios, to evaluate how these variables affect the dispersion of clay particles into the chitosan matrix. The samples obtained were characterized by infrared spectroscopy, x-ray diffraction, and mechanical (tensile) properties. 

The sponge-like porous chitosan matrix (chitosan sponge) was used to deliver the PDGF-BB, but it also showed an initial burst effect. The burst release was probably due to the ionic repulsion... 

Chandy, T. and Sharma, C. P. 1993. Chitosan matrix for oral sustained delivery of ampicillin. Biomaterials 14 939-944. 

Mahkam et al. 2009 prepared insulin-loaded modified alginate/chitosan matrix nanohydrogels. The modified nanohydrogels were characterized by SEM and Fourier transform infrared spectroscopy (FTIR). In vitro release studies were performed in acidic buffer (pH 1) and intestinal buffer (pH 7.4) with high-pressure liquid chromatography with ultraviolet detector at 210mn [43]. 

M. Mahkam, Modification of nano alginate-chitosan matrix for oral delivery of insulin. Natural Sciences 7 (2009) 1-7. 

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