Digestibility and dietary quality of nonacetylated and acetylated Vicia faba proteins in maintenance--studies on 15N -labelled adult rats

N digestibility and the dietary quality of a Vicia faba protein isolate as well as of two protein fractions from this isolate, acetylated and nonacetylated, were estimated in 15N-labelled adult rats. For reference, whole egg, casein and wheat were studied. The diets were fed at maintenance energy in...

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Bibliographic Details
Published inAnnals of nutrition and metabolism Vol. 28; no. 3; pp. 156 - 163
Main Authors Bergner, H, Seidler, W, Simon, O, Schmandke, H
Format Journal Article
LanguageEnglish
Published Switzerland 1984
Subjects
Acetylation
Animals
Dietary Proteins - metabolism
Fabaceae
Feces - analysis
food composition
food processing
food quality
horticultural crops
isotopes
Male
nitrogen
Nitrogen - metabolism
Nitrogen - urine
Nutritive Value
Plants, Medicinal
Rats
Rats, Inbred Strains
Vegetable Proteins - metabolism
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Summary:N digestibility and the dietary quality of a Vicia faba protein isolate as well as of two protein fractions from this isolate, acetylated and nonacetylated, were estimated in 15N-labelled adult rats. For reference, whole egg, casein and wheat were studied. The diets were fed at maintenance energy intake level. Daily metabolic fecal nitrogen estimated by an isotopic method was 5 mg/100 g body weight in animals receiving whole egg, casein, or Vicia faba proteins. When wheat was included in the diet metabolic fecal nitrogen was increased to 140% of this value. True N digestibility of reference proteins was 91-92% and of Vicia faba proteins 95-97%. Protein quality for maintenance was high and similar for all proteins. Acetylation affected neither N digestibility nor protein quality under maintenance conditions.
ISSN:0250-6807
1421-9697