Robberecht Harry, Van Cauwenbergh Rudy, Van Vlaslaer Veerle, Hermans Nina
University of Antwerp (UA), Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Food Science, Universiteitsplein 1, B-2610 Antwerp, Belgium.
Sci Total Environ. 2009 Aug 1;407(16):4777-82. doi: 10.1016/j.scitotenv.2009.05.019. Epub 2009 May 31.
The dietary intake of silicon by using the duplicate portion sampling technique of 24 hour-meals during 7 consecutive days is estimated.Since plant-based foods are major sources of silicon the elemental content is determined in various vegetarian foodstuffs commercially available in Belgium.Mean silicon intake from the 24-hour duplicate meals consumed daily by nearly 2000 persons was 18.6 +/- 8.5 mg/day. The major food sources were unrefined grains of high fibre content, cereal products and root vegetables. For vegetarian foods rice and barley revealed high silicon levels. Very high serum concentrations in newborns and concomittant low levels in the mothers indicated a homeostatic mechanism in humans. Besides the dietary intake, serum silicon levels of various population groups support the concept of essentiality of the element. An in vitro dialysability of the element in a simulated digestion procedure is used as a surrogate of silicon uptake.Silicon was readily available from foods but this correlated inversely with the elemental content.Serum silicon levels, as a function of age, gave indication of an important role of this element. In vitro availability study proved an inverse relation with the elemental content. A preliminary in vivo experiment confirmed that bioavailability is not only determined by concentration, but especially by the type of food and species under which silicon is present.
采用连续7天24小时膳食的双份采样技术估算膳食硅摄入量。由于植物性食物是硅的主要来源，因此测定了比利时市场上各类素食食品中的元素含量。近2000人每日食用的24小时双份膳食的平均硅摄入量为18.6±8.5毫克/天。主要食物来源是高纤维含量的粗粮、谷物制品和块根类蔬菜。对于素食，大米和大麦的硅含量很高。新生儿血清硅浓度非常高而母亲血清硅浓度相应较低，这表明人类存在一种稳态机制。除了膳食摄入量外，不同人群的血清硅水平也支持该元素必需性的概念。在模拟消化过程中该元素的体外透析性被用作硅吸收的替代指标。硅很容易从食物中获取，但这与元素含量呈负相关。血清硅水平随年龄变化，表明该元素具有重要作用。体外可利用性研究证明其与元素含量呈负相关。一项初步的体内实验证实，生物利用度不仅取决于浓度，尤其取决于硅所在食物的类型和种类。
