Fig. 6

Analysis of reducing sugars after application of xylanases to alkali pre-treated rice straw. a Reducing sugars were measured by the DNS method, after 24-h digestion at the indicated conditions of pH and temperature. C (Control) corresponds to treated rice straw not subjected to enzyme treatment. Error bars represent standard deviation among three replicates. b Chromatographic profile of products obtained after application of xylanases to alkali-treated rice straw, as before. Peaks 1, 2, 3 and 4 correspond to xylose, xylobiose, xylotriose and xylotetraose, respectively. Other relatively abundant, unidentified products are marked with an asterisk