|Taylor, Joshua - Bret|
Submitted to: Journal of Food Composition and Analysis
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/9/2007
Publication Date: 3/1/2008
Citation: Taylor, J.B., Marchello, M.J., Finley, J.W., Neville, T.L., Combs, G.F., Caton, J.S. 2008. Nutritive value and display-life attributes of selenium-enriched beef-muscle foods. Journal of Food Composition and Analysis. 21(2):183-186. Interpretive Summary: We produced selenium-enriched muscle-food products by feeding high-selenium wheat grain to beef steers. Compared to non-enriched beef-muscle, this selenium-enriched product has a much greater amount of selenium, and similar display-life and major-nutrient attributes. A 100-gram serving of the selenium-enriched muscle foods examined in this study would provide approximately 109 micrograms of dietary selenium, which is 156 and 198% of the current Recommended Daily Allowance (RDA) for adult human males and females, respectively. Consumption of this product in place of a 100-g serving of “normal-selenium” muscle foods would result in an approximate net increased-selenium intake of 75 micrograms. For Americans, such a net increase would not only meet the RDA, but would also provide the level of Se associated with cancer risk reduction in the Nutritional Prevention of Cancer trial.
Technical Abstract: Our objective was to assess the nutritive value and display-life attributes of selenium-enriched beef-muscle foods. Samples of foreshank and short loin subprimals were excised from chilled carcasses (n = 20) of beef steers that were individually finished (120 days) on either supranutritional selenium (selenium-enriched; 68.1 ug selenium/kg body weight/day; n = 9) or adequate selenium (non-enriched; 9.1 ug selenium/kg body weight/day; n = 11) diets. High-selenium wheat grain was included in the diet of supranutritional selenium-fed steers to achieve selenium enrichment. Selenium-enriched foreshank had 3.8-times more (1085 vs. 283 ng/g wet weight, P < 0.01) selenium and 1.3-times more (P < 0.01) glutathione peroxidase activity than non-enriched foreshank samples. Selenium-enrichment did not influence foreshank (P = 0.16 to 0.89) moisture, ash, crude protein, and lipid contents, and expressible moisture, or short loin (P = 0.11 to 0.41) drip-loss percentage or color change throughout the display-life evaluation. The results indicate that, compared to non-enriched, selenium-enriched beef-muscle foods have a much greater amount of selenium, and similar display-life attributes and major-nutrient contents.