Sandström B, Cederblad A
Am J Clin Nutr. 1980 Aug;33(8):1778-83. doi: 10.1093/ajcn/33.8.1778.
The absorption of zinc in man from composite meals of conventional foods with various main protein sources was measured with a radionuclide technique. The meals were extrinsically labeled with 65Zn and the absorption of zinc was determined from a measurement of the whole-body retention of the isotope about 2 weeks after ingestion of the labeled meal. The meals consisted of a meat patty made from either chicken, beef, or soybeans, and included potatoes, tomatoes, and white bread. For meals based on animal protein a positive correlation was found between zinc absorption and zinc content. When 25% of the animal protein in the chicken meal was replaced by defatted soy flour neither the zinc content nor zinc absorption were significantly influenced. The same substitution in a beef meal resulted in a decrease in zinc content and also a lower zinc absorption. The absorption from a soybean meal did not differ from an animal protein meal with the same zinc content. Lower zinc absorption was found when the calcium content of a soybean meal was increased by the addition of milk. For this study, the total zinc content of the meal was the most important factor influencing the amount of zinc absorbed.
采用放射性核素技术测定了人体从含有各种主要蛋白质来源的传统食物复合餐中对锌的吸收情况。这些餐食通过用⁶⁵Zn进行外部标记，并且在摄入标记餐食约2周后，通过测量同位素在全身的潴留情况来确定锌的吸收。餐食包括由鸡肉、牛肉或大豆制成的肉饼，以及土豆、西红柿和白面包。对于以动物蛋白为基础的餐食，发现锌吸收与锌含量之间呈正相关。当鸡肉餐中25%的动物蛋白被脱脂大豆粉替代时，锌含量和锌吸收均未受到显著影响。在牛肉餐中进行同样的替代会导致锌含量降低，锌吸收也会降低。大豆餐的吸收与锌含量相同的动物蛋白餐没有差异。当通过添加牛奶增加大豆餐的钙含量时，锌吸收降低。对于本研究，餐食中的总锌含量是影响锌吸收量的最重要因素。
