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首页> 外文期刊>Journal of human nutrition and dietetics >Zinc absorption in Brazilian subjects fed a healthy meal
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Zinc absorption in Brazilian subjects fed a healthy meal

机译：饮食健康的巴西人吸收锌

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Background The high amounts of phytic acid present in diets from developing countries are considered as important inhibitors of zinc (Zn) absorption. The present study aimed to assess the fractional absorption of Zn from a meal containing common Brazilian foods using the stable isotope technique. Methods Twelve men, aged 19–42?years, were fed a healthy experimental diet comprising lettuce, tomato, French fries, steak with onions, rice, beans, papaya, orange, pineapple, and passion fruit juice. Each subject received one intravenous dose of enriched 70Zn, and the lunch was extrinsically labelled with enriched 67Zn. Urinary 67Zn and 70Zn enrichments were assessed by inductively coupled plasma mass spectrometry. Results The labelled meal phytate?:?Zn molar ratio was very divergent with respect to chemically determined and calculated data. Subjects presented a normal Zn nutritional status before and after the study. The mean Zn absorption from the labelled meal was 30% (range 11–47%). Conclusions According to the World Health Organization parameters, the results denote a moderate/high Zn bioavailability in the evaluated meal, with a variability in the absorption percentage that is similar to other studies. The data show that a typical Brazilian meal, with an adequate energy amount and a balanced macronutrient distribution, presents a Zn bioavailability in accordance with the worldwide recommended standard.
机译：背景技术来自发展中国家的饮食中存在的大量植酸被认为是锌（Zn）吸收的重要抑制剂。本研究旨在使用稳定同位素技术评估含普通巴西食品的膳食中锌的部分吸收。方法12名年龄在19-42岁的男性接受了健康的实验饮食，包括生菜，番茄，炸薯条，洋葱牛排，大米，豆类，木瓜，橙子，菠萝和百香果汁。每个受试者接受一剂静脉注射的富集的70Zn，午餐用外源性标记为富集的70Zn。尿液中67Zn和70Zn的富集通过电感耦合等离子体质谱法进行评估。结果相对于化学测定和计算的数据，标记的植酸粗粉中α∶βZn的摩尔比差异很大。在研究之前和之后，受试者呈现正常的锌营养状况。加标膳食中锌的平均吸收量为30％（范围11-47％）。结论根据世界卫生组织的参数，结果表明所评估的膳食中锌的生物利用度处于中等/高水平，其吸收百分率的变化与其他研究相似。数据表明，具有足够能量和均衡的大量营养素分布的典型巴西粕具有符合全球推荐标准的锌生物利用度。

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