Determination of selenium concentration of rice in China and effect of fertilization of selenite and selenate on selenium content of rice
Determination of selenium concentration of rice in China and effect of fertilization of selenite and selenate on selenium content of rice
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DOI：
10.1021/jf0201374
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发表时间：
2002-08-28
影响因子：
6.1
通讯作者：
Pan, GX
中科院分区：
文献类型：
--
作者：
Chen, LC;Yang, FM;Pan, GX
采用氢化物发生原子荧光光谱法测定了中国普通精米和叶面施富硒肥以亚硒酸盐和硒酸盐形式获得的富硒精米的硒浓度。普通大米的平均硒含量为0.025 +/- 0.011马克克（-1）。根据中国营养学会建议的每日膳食大米摄入量300-500克，计算得出成人每日从普通大米中摄取硒的总量为7.5-12.5马克。叶面施硒肥20 g硒酸钠和硒酸钠能显著提高水稻硒含量，使硒含量达到0.471 ~ 0.640微克（-1）。施用硒酸盐的水稻硒含量比施用亚硒酸盐的水稻硒含量高35.9%，说明硒酸盐富硒肥对提高水稻产品硒含量的效果更好。如果将富硒米制品中的硒含量控制在0.3 ~ 0.5微克（-1），则富硒米制品平均每天食用400克米制品可使硒摄入量增加100 ~ 200微克。由于水稻是中国的主食，通过生物富集硒来提高水稻硒含量的富硒水稻可能是硒缺乏地区人群的良好硒源。
A method of hydride generation atomic fluorescence spectrometry was applied to the determination of the selenium concentration of regular polished rice in China and selenium-enriched polished rice obtained by foliar application of selenium-enriched fertilizer in the forms of selenite and selenate. The average selenium content of regular rice was 0.025 +/- 0.011 mug g(-1). On the basis of a daily dietary rice intake of 300-500 g suggested by the China Nutrition Society, the total selenium intake from regular rice was calculated to be 7.5-12.5 mug per person per day for an adult. The selenium contents of rice were significantly increased to 0.471-0.640 mug g(-1) by foliar application of selenium-enriched fertilizer at rate of 20 g of Se ha(-1) in the forms of sodium selenite and sodium selenate. The selenium content of rice by application of a fertilizer of selenate was 35.9% higher than that by a fertilizer of selenite, which showed that Se-enriched fertilizer in selenate exhibited greater efficiency in increasing Se content in rice products. The Se-enriched rice products can increase daily Se intake on average by 100-200 mug of Se per day by the consumption of 400 g of rice products if the Se level of rice products is controlled at 0.3-0.5 mug of Se g(-1). Because rice is a staple food in China, selenium-enriched rice obtained by bioenrichment of selenium to increase the Se content of rice could be a good selenium source for the population in selenium-deficient regions.