Author
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BERGMAN, CHRISTINE |
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Submitted to: Cereal Foods World
Publication Type: Peer Reviewed Journal Publication Acceptance Date: 1/3/2003 Publication Date: 7/1/2003 Citation: BERGMAN, C.J. GENOTYPE AND ENVIRONMENT EFFECTS ON THE TOCOL AND GAMMA-ORYZANOL CONTENTS OF SOUTHERN U.S. RICE. CEREAL FOODS WORLD. 2003. p. 446-449. Interpretive Summary: Technical Abstract: Across the world rice bran is primarily considered a byproduct of the rice milling process. Yet, it contains phytonutrients such as the tocols and the gamma-oryzanol fraction that reportedly have positive effects on human health. Rice bran or its extracts are therefore attractive candidates for use in the development of functional foods. The objectives of this research were to quantify the levels of tocols and gamma-oryzanol in currently grown U.S. rice cultivars and to determine the effects of the environment on their levels. Ten Southern U.S. rice cultivars were grown in Texas, Louisiana, Mississippi and Arkansas, during 1999. Reverse-phase HPLC with UV and flourescent detectors were used to quantify the tocol and gamma-oryzanol contents of the samples. The levels of these phytonutrients varied significantly due to genetics and environment. Across environments, the cultivars varied in total tocol content by 40 percent (0.20 to 0.29 mg/g) and in gamma-oryzanol content by 63 percent (3.40 to 5.37 mg/g). Thus, there appears to be sufficient genetic variation to warrant selecting specific cultivars for use in developing functional foods. Tocol and gamma-oryzanol contents were correlated, but at a low level. Consequently, it seems that to obtain rice bran with elevated levels of both phytonutrients fractions, new cultivars will need to be developed. |
