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Evolution and
kinetics of monosaccharides, disaccharides and alpha-galactosides during
germination of lentils.
Z Lebensm Unters Forsch 1996 Jan;202(1):35-9
Frias J, Diaz-Pollan C, Hedley CL, Vidal-Valverde C.
John Innes Centre, Norwich, UK.
The effect of light and seed rinsing during the germination of lentil seeds
(Lens culinaris var. vulgaris, cultivar Magda-20) on the level of
monosaccharides, disaccharides and alpha-galactosides (raffinose, ciceritol and
stachyose) was investigated. The total soluble sugar content corresponded to
about 9% of the mature seed weight, about 65% of which was alpha-galactosides.
Germination brought about a large decrease in alpha-galactosides: 18% to 40%
losses after 3 days and 100% after 6 days. However, glucose, which was not
detected in ungerminated seeds, as well as fructose and sucrose gradually
increased during germination. The content of alpha-galactosides decreased more
rapidly when germinating seeds were given 6 h light per day, but under these
conditions there was also a major reduction in the levels of fructose, glucose
and sucrose. Seeds rinsed daily showed a greater reduction of alpha-galactosides
and an increase in the levels of fructose, glucose and sucrose. When seeds were
germinated for 10 days in the dark with daily rinsing, the content of alpha-galactosides
decreased gradually during the first 4 days and they were not detected after 6
days. Under these conditions, fructose, glucose and sucrose, which represented
about 3% of the mature seed weight, started increasing after day 2 and
represented more than 13% of the germinated seed dry weight after 10 days.
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