Beta-Carotene in Golden Rice is Effectively Converted to Vitamin A
May 15, 2009| |
Results of a study conducted by researchers from the Tufts University, Baylor College of Medicine and U.S. Department of Agriculture revealed that the beta-carotene derived from Golden Rice is effectively converted to vitamin A in humans. Five adult volunteers were given servings of 65 to 98 g of golden rice containing 1–1.5 mg beta-carotene for 36 days. The researchers then measured the amount of retinol, a form of vitamin A, in blood samples collected from the volunteers. They found that four units of beta-carotene from Golden Rice convert to one unit of vitamin A in humans (specifically, 3.8 ± 1.7 to 1 with a range of 1.9–6.4 to 1 by weight).
Golden Rice, which carries the beta-carotene biosynthesis genes psy from daffodil and crt1 from Erwinia, contains 35 micrograms of beta-carotene per gram.
Read the paper published by the American Journal of Clinical Nutrition at http://dx.doi.org/10.3945/ajcn.2008.27119
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