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For quantification of overall fiber accessibility of lignocellulosic substrates, Direct Yellow 11 (C.I. 40000) is a suitable alternative to the discontinued Pylam Products’ dye Direct Orange 15 (C.I. 40002/40003). In this study we present a side-by-side comparison between the two azo-stilbene dyes. We characterize individual dye fractions and provide equations to determine individual concentrations...
The enzymatic hydrolysis of cellulose to glucose by cellulases is one of the major steps involved in the conversion of lignocellulosic biomass to yield biofuel. This hydrolysis by cellulases, a heterogeneous reaction, currently suffers from some major limitations, most importantly a dramatic rate slowdown at high degrees of conversion. To render the process economically viable, increases in hydrolysis...
Microcrystalline cellulose (Avicel) was subjected to three different pretreatments (acid, alkaline, and organosolv) before exposure to a mixture of cellulases (Celluclast). Addition of β-glucosidase, to avoid the well-known inhibition of cellulase by cellobiose, markedly accelerated cellulose hydrolysis up to a ratio of activity units (β-glucosidase/cellulase) of 20. All pretreatment protocols of...
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