Total isothiocyanate yield from raw cruciferous vegetables commonly consumed in the United States
2013
Tang, Li | Paonessa, Joseph D. | Zhang, Yuesheng | Ambrosone, Christine B. | McCann, Susan E.
Dietary isothiocyanates are a group of promising chemopreventive agents obtained primarily from cruciferous vegetables. Due to their potent chemopreventive and/or anti-cancer activities, there is a growing interest in assessing dietary isothiocyanate exposure and its impact on human health. Using the HPLC-based cyclocondensation assay, the current study measured total isothiocyanate yield from raw cruciferous vegetables. A total of 73 samples comprising nine types of cruciferous vegetables were analyzed. We observed a wide range of isothiocyanate content across the individual vegetables with an average level of 16.2μmol/100g wet weight, ranging from 1.5μmol in raw cauliflower to 61.3μmol in raw mustard greens. The data represent the maximum amount of isothiocyanates released from the intake of raw cruciferous vegetables. Given that the vegetables assayed in this study include the most commonly consumed cruciferous vegetables in western diets, the data may be particularly useful in estimation of dietary isothiocyanate exposure in these populations. However, due to the variation observed within each vegetable, biomarkers such as urinary isothiocyanate level may be necessary for accurate estimation of individual exposure.
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