To examine the neutral sugar composition of the
polysaccharide, the alditol acetate procedure modified by
Blakeney et al.13 was applied to the residue samples and to
the extractives, by using a Shimadzu gas chromatograph
GC-1700 with a TC-17 capillary column. The conditions
that were different from the original procedure are as
follows: hydrolysis condition (H2SO4 concentration 4%,
temperature 121°C for 60 min using an autoclave),3 quantity
of ammonia water (0.2 ml), and the reduction time (90min).
For the extractives, the concentration of the organic
matter having ultraviolet absorption was examined in the
following procedure:14 dried samples (5mg) were dissolved
in a solution of 25% (w/w) acetyl bromide in acetic acid
(2.5 ml) containing perchloric acid (70%, 0.1 ml) at 70°C for
30min with occasional shaking; the solution was transferred
to a 50 ml volumetric flask containing 2M sodium hydroxide
(10 ml) and acetic acid (12ml), made up to 50 ml with acetic
To examine the neutral sugar composition of the
polysaccharide, the alditol acetate procedure modified by
Blakeney et al.13 was applied to the residue samples and to
the extractives, by using a Shimadzu gas chromatograph
GC-1700 with a TC-17 capillary column. The conditions
that were different from the original procedure are as
follows: hydrolysis condition (H2SO4 concentration 4%,
temperature 121°C for 60 min using an autoclave),3 quantity
of ammonia water (0.2 ml), and the reduction time (90min).
For the extractives, the concentration of the organic
matter having ultraviolet absorption was examined in the
following procedure:14 dried samples (5mg) were dissolved
in a solution of 25% (w/w) acetyl bromide in acetic acid
(2.5 ml) containing perchloric acid (70%, 0.1 ml) at 70°C for
30min with occasional shaking; the solution was transferred
to a 50 ml volumetric flask containing 2M sodium hydroxide
(10 ml) and acetic acid (12ml), made up to 50 ml with acetic
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