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Niacin bioavailability as affected by tannin from tea and sorghum
Abstract
Studies were conducted to determine the effect on tannins on niacin utilization. In study I, feeding tannin from sorghum breakfast cereal to healthy human adults did not significantly affect urinary N$\sp1$-methylnicotinamide excretion and blood serum N$\sp1$-methylnicotinamide and nicotinamide concentrations. However, the whole grain sorghum cereal treatment tended to produce lower urinary N$\sp1$-methylnicotinamide excretion in comparison to the polished grain sorghum cereal treatment. In study II, ten healthy subjects received 8 g of instant tea/day or no tea for 28 days in addition to constant, basal diet. Subjects receiving the tea supplementation significantly decreased urinary N$\sp1$-methylnicotinamide excretion. Feeding tea supplements had no significant effects on blood serum N$\sp1$-methylnicotinamide and nicotinamide concentrations. In an animal study, weanling mice were fed 3 different levels of tannin sorghum diets and 3 different levels of niacin supplementation. Tannin contents in sorghum diets significantly influenced mouse urinary N$\sp1$-methylnicotinamide excretion, mouse weight gains, mouse feed consumptions and mouse feed efficiencies. The higher the tannin content in the sorghum, the lower were the response the variables tested. The higher the niacin supplementation, the higher were the mouse urinary N$\sp1$-methylnicotinamide excretion. In the survey study, anthropometric measurements, energy intake, niacin intake and beverages consumptions were calculated from the 5-day self-recorded diets of 65 the U.S. American and 63 the international students. There was a significant positive correlation between the energy intake and niacin intake among all the subjects. Niacin intakes were not to be significantly related to beverage choices in this survey.
Subject Area
Nutrition
Recommended Citation
Wang, Rau Sheu (Andrea), "Niacin bioavailability as affected by tannin from tea and sorghum" (1988). ETD collection for University of Nebraska-Lincoln. AAI8824957.
https://digitalcommons.unl.edu/dissertations/AAI8824957