Evaluation of size distribution of starch granules in selected wheat
varieties by the Low Angle Laser Light Scattering method
Plant, Soil and Environment, 49 (1):
12--17 (2003)Abstract
The distribution of the size of wheat starch granules using the method
LALLS (Low Angle Laser Light Scattering), followed by the evaluation
of the effect of variety, experimental site and intensity of cultivation
on the vol. % of the starch A (starch granules > 10 ?m) was determined.
The total starch content and crude protein content in dry matter
of flour T530 in selected collection of five winter wheat varieties
were determined. Vol. % of the starch A in evaluated collection of
wheat varieties varied between 65.31 and 72.34%. The effect of a
variety on the vol. % of starch A seemed to be more marked than the
effect of site and intensity of cultivation. The highest vol. % of
starch A reached evaluated varieties from the quality group C, i.e.
varieties unsuitable for baking utilisation (except variety Contra
with high total content of starch in dry matter of flour T530, but
relatively low vol. % of starch A). A low vol. % of starch A was
also found in the variety Hana (very good variety for baking utilisation).
Certain variety differences followed from the evaluation of distribution
of starch fractions of starch granules, forming starch A. In the
case of varieties Hana, Contra and Siria higher representation of
fractions up to 30 ?m was recorded, while starch A in the varieties
Estica and Versailles was formed in higher degree by size fractions
of starch granules over 30 ?m and particularly size fraction > 50
?m was greatest in these varieties of all evaluated samples. With
increasing total starch content in dry matter of flour T530 the crude
protein content decreased; the vol. % of starch A not always increased
proportionally with increasing total starch content.