Shimoshima C, Nishioka C, Takiyama K, Yuge O, Katayama Y
Food and Nutrition, Mukogawa Women's University, Nishinomiya, Japan.
J Nutr Sci Vitaminol (Tokyo). 1988 Feb;34(1):67-78. doi: 10.3177/jnsv.34.67.
We examined hair properties from determinations of diameter, amino acid composition, trace metal elements, and tensile strength of the hairs from protein-malnourished rats. The coarse or medium hair diameters of the experimental protein-malnourished rats had a tendency to decrease more than those of the control. Total contents of amino acids in the hairs had a tendency to decrease in the protein-deficient rats. Cystine content of rat hairs definitely decreased only in 5% wheat- and 5% rice-pattern amino acid mixture diet groups but not in 5% gluten diet and 5% casein diet groups. And many of the low-protein diet groups were significantly lower in methionine content than the control except for the 5% casein diet group. The Mg, Zn, and Fe contents in the hairs considerably increased in protein-deficient rats against the control. Tensile strength of coarse hairs in the experimental protein-malnourished rats was significantly lower than that of the control. The changes in amino acid composition of rat hair proteins are more likely to be influenced by various qualities of dietary protein or different compositions of amino acid mixtures in the diets at a similar dietary protein level. It should seriously be considered from our data whether the reduced cystine content in the hair can be regarded as an indicator of nutritional status.
我们通过测定蛋白质营养不良大鼠毛发的直径、氨基酸组成、微量金属元素和拉伸强度来研究毛发特性。实验性蛋白质营养不良大鼠的粗发或中等直径毛发比对照组有更大的变细趋势。蛋白质缺乏大鼠毛发中的氨基酸总含量有下降趋势。大鼠毛发中的胱氨酸含量仅在5%小麦和5%大米模式氨基酸混合饮食组中确实下降，而在5%面筋饮食组和5%酪蛋白饮食组中未下降。除5%酪蛋白饮食组外，许多低蛋白饮食组的蛋氨酸含量均显著低于对照组。蛋白质缺乏大鼠毛发中的镁、锌和铁含量相对于对照组显著增加。实验性蛋白质营养不良大鼠粗发的拉伸强度显著低于对照组。在相似的膳食蛋白质水平下，大鼠毛发蛋白质氨基酸组成的变化更可能受膳食蛋白质的各种质量或饮食中氨基酸混合物不同组成的影响。从我们的数据来看，毛发中胱氨酸含量的降低是否可被视为营养状况的指标值得认真考虑。
