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Tocopherol in human platelets.

A spectrophotometric method was used to determine the total tocopherol levels in platelets, plasma, and erythrocytes from human subjects. The platelets contained about three times as much total tocopherol per cell as erythrocytes. This difference was not related to the content of polyunsaturated fatty acids in platelets and erythrocytes. In vitro incubation resulted in significant uptake of tocopherol by plasma and RBC, whereas no uptake was observed into platelets. A 3-month period of tocopherol treatment increased the level of tocopherol in plasma and erythrocytes, whereas the platelet level was unchanged. Tocopherol treatment did not interfere with platelet function or platelet lipid metabolism. The tocopherol fractions of platelets, red cells, and plasma were similar, and alpha-tocopherol was the main fraction.