5.2.3. Analysis of sugar components of 1 and 2. The above
hydrolyzed aqueous portion was passed through Amberlite
IRA400 and the eluate was concentrated to dryness in vacuo
to give a residue, which was dissolved in dry pyridine, then
L-cysteine methyl ester hydrochloride was added to the
solution. The reaction mixture was heated at 60 8C for 2 h
and concentrated to dryness using N2. To the residue was
added trimethylsilylimidazole, and the mixture was heated
at 60 8C for 1 h. The reaction mixture was concentrated to
dryness, and The residue was extracted with a mixture of
hexane and H2O, and the organic layer was analyzed by gas
liquid chromatography (GLC); column: OV-17
(0.32 mm£30 m), detector: FID, column temp.: 230 8C,
injector temp.: 270 8C, carrier gas: He (2.2 kg/cm2). Each
peak was observed at tR (min); 1701600 (D-glc), 1605400
(D-gal), 1107100 (L-rha) 908200 (D-xyl). The standard monosaccharides
were subjected to the same reaction and GLC
analysis under the same condition.
5.2.3. Analysis of sugar components of 1 and 2. The above
hydrolyzed aqueous portion was passed through Amberlite
IRA400 and the eluate was concentrated to dryness in vacuo
to give a residue, which was dissolved in dry pyridine, then
L-cysteine methyl ester hydrochloride was added to the
solution. The reaction mixture was heated at 60 8C for 2 h
and concentrated to dryness using N2. To the residue was
added trimethylsilylimidazole, and the mixture was heated
at 60 8C for 1 h. The reaction mixture was concentrated to
dryness, and The residue was extracted with a mixture of
hexane and H2O, and the organic layer was analyzed by gas
liquid chromatography (GLC); column: OV-17
(0.32 mm£30 m), detector: FID, column temp.: 230 8C,
injector temp.: 270 8C, carrier gas: He (2.2 kg/cm2). Each
peak was observed at tR (min); 1701600 (D-glc), 1605400
(D-gal), 1107100 (L-rha) 908200 (D-xyl). The standard monosaccharides
were subjected to the same reaction and GLC
analysis under the same condition.
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