The monosaccharide
mixt. was suggested to be composed of xylose, fucose
and rhamnose by direct TLC comparison with authentic
samples. R I (n-BuOH-Me2CO-H20, 4: 5:1): 0.66
(rhamnose); 0.51 (xylose); 0.48 (fucose). The mixt. (2
rag) was diluted with HzO (1 ml) and treated with
(-)-~-methylbenzylamine (5 rag) and Na[BH3CN] (8
mg) in EtOH (1 ml) at 40 ° for 4 hr, followed by
acetylation with Ac20 (0.3 ml) in pyridine (0.3 ml).
The reaction mixt. was passed through a Sep-Pak C~8
cartridge (Waters) with H20-MeCN (4:1; 1:9, each
10 ml). The H20-MeOH (1:9) eluate fr. was further
passed through a Toyopak IC-SP M cartridge (Tosoh)
with EtOH (10 ml) to give a mixt. of 1-[(S)-N-acetyl-
~-methylbenzylamino]-l-deoxyalditol acetate derivatives
of the monosaccharides [11, 12], which were then
analysed by HPLC under the following conditions:
solvent, MeCN-H20 (2:3); flow rate, 0.8 ml min-~;
detection, UV 230 nm. The derivatives of D-xylose, Dfucose
and L-rhamnose were detected. R, (min): 18.73
(o-xylose derivative); 20.80 (o-