L. Andersson et al., Characterisation of starch from inner and peripheral parts of normal and waxy barley kernels, J CEREAL SC, 30(2), 1999, pp. 165-171
A previous microscopical examination of barley kernels indicated an uneven
distribution of amylose in the waxy cultivar SW7142-92, where the subaleuro
ne layer was strongly stained by iodine. To explain these results, starch w
as isolated from fractions of inner and peripheral parts of kernels of the
waxy cultivar and a cultivar with normal starch. Analyses of amylose conten
t showed a higher concentration of amylose in starch from the outer part of
the waxy barley kernel, where the amylose, determined by a colorimetric me
thod, made up 8.6% of the starch compared with 5.9% in the middle and 2.2%
in the innermost part of the waxy kernel. This difference in amylose distri
bution was not observed in the normal starch kernel. The results were confi
rmed by gel permeation chromatography. No differences in amylopectin chain
length distribution were detected by size exclusion HPLC and HPAEC-PAD of a
mylopectins from different parts of the barley kernels. (C) 1999 Academic P
ress.