American Journal of Clinical Nutrition, Vol 62, 110-116, Copyright © 1995 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Intestinal beta-carotene absorption and cleavage in men: response of beta-carotene and retinyl esters in the triglyceride-rich lipoprotein fraction after a single oral dose of beta-carotene

T van Vliet, WH Schreurs and H van den Berg
TNO Nutrition and Food Research Institute, Zeist, Netherlands.

Postprandial response curves of beta-carotene and retinyl esters in a triglyceride-rich lipoprotein (TRL) fraction were evaluated as a potential measure of beta-carotene uptake and cleavage. beta-Carotene, retinyl ester, and triglyceride concentrations in the TRL fraction (density < 1.006 kg/L) and plasma were measured in 10 men for 8 or 16 h after an oral dose of 15 mg beta-carotene. The beta-carotene response, unlike the triglyceride and retinyl ester response, can be evaluated in the TRL fraction but not in plasma. Intraindividual variations in the triglyceride-adjusted response of beta-carotene and retinyl palmitate in TRL fractions were 23% and 20% and interindividual variations were 42% and 36%, respectively. A low beta-carotene response was associated with a high ratio between retinyl palmitate and beta-carotene responses (r = -0.56, P = 0.013). In conclusion, the measurement of beta-carotene and retinyl esters in the TRL fraction after a dose of beta-carotene with a vitamin A-free meal may be an appropriate method to study beta- carotene uptake and cleavage.

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