Please use this identifier to cite or link to this item:
|Type:||Artigo de periódico|
|Title:||Optical anisotropy of alcian blue-stained acid glycosaminoglycans|
|Abstract:||Optical anisotropy as dispersion of birefringence (DB) (birefringence studied for light of different wavelengths) and linear dichroism (LD) (selective absorption of polarized Light) in stained substrates reflects their macromolecular orientation states. Birefringence interference colors of alcian blue (AB)-stained glycosamino-glycans (GAG) and glycoconjugates observed with polarization microscopy have been found to vary, although their staining characteristics under unpolarized Light are practically the same. We investigated the optical anisotropy of GAG-AB and some glycoconjugate-AB complexes used as standards, to provide a basis for interpreting results for AB-stained materials in situ. Filamentous preparations of hyaluronic acid (HA), chondroitinsulfates, proteoglycans, and a mucus sulfoglycoconjugate were studied. Anomalous DB (birefringence sign changing with the wavelength of the incident Light) was generally observed, but LD was seen only in the AB-HA complex. LD simultaneous to anomalous DB characteristics on the AB-HA complex were assumed to be caused by a maximally oriented helical conformation of the HA. For the other AB-GAG studied, the optical anisotropic characteristics were suggestive of some degree of folding of their chains into a tertiary structure. The profiles of the anomalous DB curves for the AB-stained sulfoglycoconjugate differed from those of the other materials, probably due to different organization of its dye-binding sites. (C) 2006 Elsevier GmbH. All rights reserved.|
dispersion of birefringence
|Editor:||Elsevier Gmbh, Urban & Fischer Verlag|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.