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首页> 外文期刊>Journal of Trace Elements in Experimental Medicine >Determination of Selenium Concentration and Its Chemical Forms in the Milk of Kuwaiti and Non-Kuwaiti Lactating Mothers
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Determination of Selenium Concentration and Its Chemical Forms in the Milk of Kuwaiti and Non-Kuwaiti Lactating Mothers

机译：科威特和非科威特哺乳期母亲的牛奶中硒含量及其化学形态的测定

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摘要

The objectives of the present study were to compare the selenium status in the milk and plasma of Kuwaiti mothers with that of non-Kuwaiti mothers during 0-18 months of lactation and to identify and compare the chemical forms of selenium in human milk and cow milk. Thirty-four donors between 25 to 40 years of age (Kuwaitis, n= 17; non-Kuwaitis, n = 17) were studied. Milk samples were obtained prior to the first feeding of the infant and blood samples were collected shortly after. Milk fractionation was performed by ultracentrifugation, gel-column chromatography, and thin-layer chromatography. Concentrations of selenium were analyzed using atomic absorption spectrophotometry and gluta-thione-peroxidase by spectrophotometry Concentrations of selenium in milk and plasma and content of proteins in milk were significantly higher in the Kuwaiti group than those of the non-Kuwaitis during the first 12 months of lactation. The selenium profile in milk was parallel with those of total proteins, casein, and whey. In general, these parameters including the activity of glutathione-peroxidase, were decreased as lactation was prolonged. The major chemical form of selenium in human milk was found to be selenomethionine. Cow milk did not appear to contain this compound, but might have a free selenium form that is neither selenite nor selenate. In conclusion, 1) the higher level of selenium in the milk of Kuwaiti mothers may reflect the high protein content of regional diets and traditional treatment with herbal medicines during post-parturition and 2) selenomethionine is the major selenium-containing compound located in the whey protein fraction of human milk, and this may enhance the bio-availability of selenium.
机译：本研究的目的是比较哺乳期0-18个月期间科威特母亲和非科威特母亲的牛奶和血浆中硒的状况，并鉴定和比较人乳和牛奶中硒的化学形式。研究了34位年龄在25至40岁之间的捐赠者（科威特人，n = 17;非科威特人，n = 17）。在婴儿第一次喂养之前获得牛奶样品，并在之后不久收集血液样品。通过超速离心，凝胶柱色谱法和薄层色谱法进行乳分离。用原子吸收分光光度法和谷氨酸-硫酮过氧化物酶通过分光光度法分析了硒的含量。在科威特的前12个月中，牛奶和血浆中硒的含量和牛奶中蛋白质的含量显着高于非科威特。哺乳期。牛奶中的硒分布与总蛋白质，酪蛋白和乳清的分布平行。通常，随着泌乳时间的延长，这些参数包括谷胱甘肽过氧化物酶的活性会降低。发现母乳中硒的主要化学形式是硒代蛋氨酸。牛奶似乎不包含这种化合物，但可能具有既不含亚硒酸盐也不不含硒酸盐的游离硒形式。总之，1）科威特母亲的牛奶中硒含量较高，可能反映了分娩后局部饮食和传统草药中高蛋白含量; 2）硒代蛋氨酸是乳清中主要的含硒化合物牛奶中蛋白质的一部分，这可能会提高硒的生物利用度。

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