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3 protocols using d xylulose

1

Enzymatic Assays of Carbohydrates

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d-erythrose, l-erythrulose, d-erythritol, d-arabitol, l-arabinose, d-xylose, d-ribose, and d-xylulose were obtained from Sigma-Aldrich (St. Louis, United States). Coomassie brilliant blue R-250, cofactor NADP, NAD, NADH, NADPH, and antibiotics were purchased from Sangon Biotech (Shanghai, China). The chromatographic media were procured from GE Healthcare Life Sciences (Sweden). All other chemicals were of analytical grade and used as such without any purification.
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2

Furfural Production from d-Xylose

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d-Xylose (>98%) from Alfa Aesar was used as a raw material for furfural production. d-Xylose (>99%), d-xylulose (>98%), d-lyxose (99%) and furfural (>98.5%) obtained from Sigma-Aldrich were used for product analysis. Aluminum chloride (>95%) and formic acid (88%) were purchased from Alfa Aesar. Acetonitrile (99.9%) used as a mobile phase for the analysis of product was obtained from RCI Labscan. Amberlyst 21 was purchased from Alfa Aesar for the acid catalyst removal process.
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3

Synthesis of Nucleotide Sugars

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D-ribose, D-ribulose, and D-ribitol were purchased from Carbosynth. D-galactose was from Merck Millipore. Cytidine triphosphate, D-xylulose, D-xylose, L-arabinose, doxycycline, and 1 mol/L triethylammonium acetate were from Sigma. CMP-N-acetylneuraminic acid, UDPgalactose, UDP-glucose, UDP-N-acetylgalactosamine, UDP-N-acetylglucosamine, GDP-mannose, GDP-fucose, ADP-ribose, UDP-xylose, and UDP-glucuronic acid were from Sigma or Carbosynth.
Rbo5P was produced as previously described (5 ) . CDP-ribitol was synthesized in vitro from Rbo5P and Cytidine triphosphate with recombinantly produced human CRPPA enzyme from Escherichia coli (kind gift of Dr. W. Yue, Oxford) (5 ) . The internal standard, a 13 Cyeast extract containing [U- 13 C]-UDP-glucose, was a kind gift of Dr. G. Hermann, Vienna.
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