Uptake of β-carotene and lutein by small intestinal cells was studied by incubation the cells with the medium containing the carotenoids with various concentration. Uptake of two caroteniods by the cell was found concentration dependent which was not affected by incubation temperature and a constant percentage of uptake was observed. The results suggest that the uptake of the two carotenoids by bovine small in testinal cells was operated by passive infusion mechanism. Tween 20 in the medium had the effect o...