Abstract
Bacterial cellulose (BC) membranes covalently dyed with Remazol Brilliant Blue R (RBB) was used as an advantageous chromogenic substrate for the detection and measurement of the activity of cellulolytic enzymes. The covalent coupling was confirmed using nuclear magnetic resonance techniques. The BC membranes, both dyed and non-dyed, were saccharified with a 1:1 combination of (endoglucanases + cellobiohydrolases):β-glucosidase. Native BC required a lower enzyme loading for the release of 2 mg of reducing sugars. A higher loading was required for the RBB-BC, which, in turn, was more easily hydrolysed than both the native and the RBB-Whatman n.1 filter paper standard substrates. The enzymatic hydrolysis kinetics of RBB-BC confirmed the correlation between the release of reducing sugars and dyed products as indicated by the Pearson’s correlation coefficient (r = 0.9950). Thin layer chromatography was used to monitor glucose and traces of cellobiose as the main hydrolysis products from native BC, whereas RBB-cellobiose was markedly dominant over RBB-glucose in the case of RBB-BC hydrolysis.
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The authors would like to thank the National Council for Scientific and Technological Development (CNPq), Coordination for the Improvement of Higher Education Personnel (CAPES) and the Araucaria Foundation from SETI-PR.
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Tiboni, M., Grzybowski, A., Passos, M. et al. The use of dyed bacterial cellulose to monitor cellulase complex activity. Cellulose 19, 1867–1877 (2012). https://doi.org/10.1007/s10570-012-9787-0
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DOI: https://doi.org/10.1007/s10570-012-9787-0