Abstract
The metabolic fate of carbon derived from dietary U- 14 C-resistant (RS) and U- 14 C-gelatinized (GS) bean starches was studied in rat liver and body (mainly muscle). Male Wistar Hans rats were fed 20 mg of either GS (43.3 x 10 3 Bq) or RS (47.3 x 10 3 Bq) by gavage. The incorporation of 14 C was measured in the amino acid, lipid, and glycogen fractions of the liver and carcass. The substitution of U- 14 C-gelatinized starch with U- 14 C-resistant starch provided the body with 14 C incorporated mainly into proteins and to a lesser extent into lipids in both liver and carcass. Glutamic and aspartic acids and alanine were the amino acids with highest incorporation of 14 C in the liver. Feeding of U- 14 C-resistant starch led to a high radioactivity in the phospholipid, cholesterol, and triacylglycerol fractions in the liver and to a lesser extent in cholesterol and the free fatty acids fraction in carcass.
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