ORIGINAL PAPER
The response of rats to solanidine glycoalkaloids and trypsin inhibitor present in potato protein concentrates, and to glycoalkaloids provided by potato sprouts
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The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, 05-110 Jabłonna, Poland
Publication date: 2013-06-17
Corresponding author
A. Tuśnio
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, 05-110 Jabłonna, Poland
J. Anim. Feed Sci. 2013;22(2):130-136
KEYWORDS
ABSTRACT
The effects of potato protein concentrates (PPC) differing in dietary
solanidine glycoalkaloids (SGA) and trypsin inhibitor activity (TI), and of
potato sprouts with differing SGA levels, were studied in rats. In Experiment 1,
semi-purified isoprotein diets containing casein or one of six PPC contributing
from 116 to 439 mg SGA · kg–1 and from 0.13 to 0.45 mg · g–1 of TI activity, were
used. Weight gain was significantly greater on the diet containing PPC with low
SGA and low TI than on PPC with high SGA and moderate TI contents, and
also higher than on casein. Weight gain was also slightly depressed on diets
with the highest TI activity. Substitution of PPC for casein resulted in lowering
the pH of caecal digesta and increasing short-chain fatty acids concentration.
Feeding diets with the greatest SGA content induced depression of protein and
organic matter digestibility while diets with the greatest TI activity decreased
protein digestibility but did not affect pancreas weight. In Experiment 2, a commercial
rat diet, supplemented with increasing amounts of potato sprout meal
providing SGA in the range from 0 to 300 mg · kg–1, was used. Neither growth
performance, organ weights, caecal parameters, nor enzyme activities were
affected by the diet. It is postulated that the less evident response of rats to
SGA in the natural ingredient than in the semi-purified diet was due to the attenuating
effect of more intensive bacterial fermentation. Potato trypsin inhibitor
should be considered as an antinutritional factor in PPC; interactive effects of
SGA and TI are presumable.
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