Retained levels of dietary α-, γ- and δ-tocopherol in tissues and body fluids of Atlantic salmon, Salmo salar , L.

The purpose of this study was to describe the relationship between dietary supplementation and concentration of γ- and δ-tocopherol in tissues of Atlantic salmon, Salmo salar, L., when α-TOH was fed at a constant level

K. Hamre; Ø. Lie

2003

Scholarcy highlights

  • The purpose of this study was to describe the relationship between dietary supplementation and concentration of γ- and δ-tocopherol in tissues of Atlantic salmon, Salmo salar, L., when α-TOH was fed at a constant level
  • The concentrations of γ- and δ-TOH in most tissues were directly proportional to the feed concentrations
  • The relative retained levels of α, γ- and δ-TOH in most tissues were similar to their biological activities in mammals
  • An exception was muscle and adipose tissue, where γ- and δ-TOH were retained at rates of 70–90% and 20–35% compared with α-TOH, respectively. α-TOH was retained to a greater extent when α-TOH was fed alone than when γ- and δ-TOH were added to the diet
  • Fish growth was significantly correlated to total dietary TOH concentration
  • The data suggest that turnover of tocopherols in Atlantic salmon is similar to that in mammals, i.e. that discrimination between the tocopherols is mediated through competition for a tocopherol-binding protein in the liver, and that α-TOH is preferentially secreted in very low density lipoprotein
  • Muscle and adipose tissue appear to be supplied with tocopherols from chylomicrons that have not yet been exposed to the hepatic discrimination mechanism

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