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|Type:||Artigo de periódico|
|Title:||Using the FT-IR linear dichroism method for molecular order determination of tendon collagen bundles and nylon 6|
|Abstract:||Polarized Fourier transform-infrared (FT-IR) was used to compare the orientation of vibrational chemical groups of bovine tendon collagen bundles (CBs) to that of nylon 6, a simpler polyamide model, in terms of linear dichroism (LD). Subtraction of spectral profiles identified the most significant differences regarding the amide regions. At 1630 cm(-1), the CBs displayed higher peak areas and absorbance when positioned perpendicularly (A(perpendicular to)) to the plane of polarized light, in comparison with nylon 6. In contrast, at the 1526 cm(-1) amide II spectral region the inverse occurred. In the amide III region (1232 cm(-1)), the LD was positive and higher for CBs. Dichroic ratios (DR=A(parallel to)/A(perpendicular to)) calculated from the average of ten measured spectra for CBs and nylon 6 revealed that the values for CBs were <1.0 in the 3298-1655 cm(-1) wavenumber range and >1.0 in the 1536-1234 cm(-1) wavenumber range. From 1535 to 1120 cm(-1), nylon 6 displayed DR values higher than those of CBs. The LD band integrated areas were higher in CBs than in nylon 6. The LD differences between CBs and nylon 6 are probably due to a more complex chemical composition and supramolecular oriented architecture in CBs in comparison to nylon 6. (C) 2013 Elsevier GmbH. All rights reserved.|
|Editor:||Elsevier Gmbh, Urban & Fischer Verlag|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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