Blood was obtained at the time of slaughter from 14 mature bovine animals. Plasma, leukocyte and leukocyte membranes were harvested from each blood sample and beta-carotene concentrations were determined. Plasma beta-carotene concentrations ranged from 32.4 to 115.5 nmoles/dl (17.4 to 62.0 ug/dl) with a mean concentration of 73.2 nmoles/dl (39.3 ug/dl). Whole leukocyte beta-carotene concentrations in these same animals ranged from 0.07 to 0.31 nmoles/g weight (mean=0.17 nmoles/g). Leukocyte membrane beta-carotene concentrations ranged from 0.74 pmole/g to 0.29 n mole/g (mean 0.15 nmole/g). There was a linear relationship between plasma and leukocyte beta-carotene concentrations with a correlation coefficient of .82. A linear relationship also existed between plasma and leukocyte membrane beta-carotene concentrations (correlation coefficient=.78) and between leukocyte and leukocyte membrane beta-carotene concentrations (correlation coefficient=.65). Thus, beta-carotene is present in bovine leukocyte and leukocyte membranes and a linear relationship exists between plasma levels and beta-carotene content in these cells and cell membranes.
ASJC Scopus subject areas
- Endocrinology, Diabetes and Metabolism
- Nutrition and Dietetics