Rice antioxidants: phenolic acids, flavonoids, anthocyanins, proanthocyanidins, tocopherols, tocotrienols, <i>γ</i>‐oryzanol, and phytic acid

Food Science and Nutrition - Tập 2 Số 2 - Trang 75-104 - 2014
Piebiep Goufo1, Henrique Trindade1
1CITAB—Centre for the Research and Technology of Agro‐Environment and Biological Sciences Universidade de Trás‐os‐Montes e Alto Douro 5001‐801 Vila Real Portugal

Tóm tắt

AbstractEpidemiological studies suggested that the low incidence of certain chronic diseases in rice‐consuming regions of the world might be associated with the antioxidant compound contents of rice. The molecules with antioxidant activity contained in rice include phenolic acids, flavonoids, anthocyanins, proanthocyanidins, tocopherols, tocotrienols, γ‐oryzanol, and phytic acid. This review provides information on the contents of these compounds in rice using a food composition database built from compiling data from 316 papers. The database provides access to information that would have otherwise remained hidden in the literature. For example, among the four types of rice ranked by color, black rice varieties emerged as those exhibiting the highest antioxidant activities, followed by purple, red, and brown rice varieties. Furthermore, insoluble compounds appear to constitute the major fraction of phenolic acids and proanthocyanidins in rice, but not of flavonoids and anthocyanins. It is clear that to maximize the intake of antioxidant compounds, rice should be preferentially consumed in the form of bran or as whole grain. With respect to breeding, japonica rice varieties were found to be richer in antioxidant compounds compared with indica rice varieties. Overall, rice grain fractions appear to be rich sources of antioxidant compounds. However, on a whole grain basis and with the exception of γ‐oryzanol and anthocyanins, the contents of antioxidants in other cereals appear to be higher than those in rice.

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Food Science and Nutrition

Tập 2 Số 2

75-104

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