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J Agric Food Chem. 1999 Jul;47(7):2697-704.

Isoflavones in retail and institutional soy foods.

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2312 Food Science Building, Food Science & Human Nutrition Department, Iowa State University, Ames, Iowa 50011, and Food Composition Laboratory, ARS, USDA, Beltsville, Maryland 20705, USA.


A national sampling plan was developed to select the most widely used isoflavone-containing foods in the United States. Foods were selected based on their retail volume and sampled in five geographical areas representing seven metropolitan areas. Isoflavones were analyzed from composite samples, raw and cooked, and reported by brand. Quality control measures were evaluated throughout the study. Isoflavone levels ranged from 1 microg/g in soy sauces to 540 microg/g in tempeh. Soymilk and tofu represented the major portion of soy foods evaluated. These data will appear in the electronic version of USDA Handbook No. 8 of Food Composition Data in 1999.

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