Pinto, RicardoAmaral, António L.Ferreira, Eugénio C.Mota, ManuelVilanova, ManuelRuel, KatiaGama, Miguel2018-06-082018-06-082008Pinto, Ricardo; Amaral, Antonio L.; Ferreira, Eugenio C.; Mota, Manuel; Vilanova, Manuel; Ruel, Katia; Gama, Miguel (2008). Quantification of the CBD-FITC conjugates surface coating on cellulose fibres. BMC Biotechnology. ISSN 1472-6750. 8, p. 1-71472-6750http://hdl.handle.net/10198/17686Background: Cellulose Binding Domains (CBD) were conjugated with fluorescein isothiocyanate (FITC). The surface concentration of the Binding Domains adsorbed on cellulose fibres was determined by fluorescence image analysis. Results: For a CBD-FITC concentration of 60 mg/L, a coating fraction of 78% and 110% was estimated for Portucel and Whatman fibres, respectively. For a saturating CBD concentration, using Whatman CF11 fibres, a surface concentration of 25.2 x 10(-13) mol/mm(2) was estimated, the equivalent to 4 protein monolayers. This result does not imply the existence of several adsorbed protein layers. Conclusion: It was verified that CBDs were able to penetrate the fibres, according to confocal microscopy and TEM-immunolabelling analysis. The surface concentration of adsorbed CBDs was greater on amorphous fibres (phosphoric acid swollen) than on more crystalline ones (Whatman CF11 and Sigmacell 20).engjournal article10.1186/1472-6750-8-1