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用改进的微生物分析方法测定了构成我国人民膳食的主要食物蛋白质中胱氨酸和蛋氨酸的含量。63种食物的测定结果表明,谷类、甜薯、猪肉和牛肉的蛋白质(按16g氮计)含硫氨基酸总量分别为4.10(3.42～4.47)％,4.19(3.66～4.72)％,3.68％和3.67％,达到和超过了FAO/WHO“参考蛋白”的含硫氨基酸总量(3.52％);鱼类和其他水产动物食品含量为3.32(2.68～3.71)％和3.24(2.52～3.69)％,略低于“参考蛋白”的含量;而黄豆及其他豆类和瓜籽的含硫氨基酸总量显著缺乏,分别为2.39(2.34～3.45)％,1.64(1.27～1.75)％和2.95(2.38～3.29)％,其中非黄豆豆类的含硫氨基酸总量,仅为“参考蛋白”的1/2弱。根据以往城市膳食调查资料,计算了我国人民膳食中含硫氨基酸的营养状况。指出:在我国城市居民通常的膳食中,含硫氨基酸的绝对摄入量已达到或超过Rose规定的适宜需要量。因此在豆类摄入比率不高的情况下,赖氨酸仍将是以谷物蛋白质为主的膳食蛋白质第一限制氨基酸。着豆类蛋白质的补充量较高,则应考虑到含硫氨基酸的摄入比率是否适宜问题。
The contents of cystine and methionine in the main food proteins that make up our diet were determined by an improved microbiological analysis. The results of the determination of 63 kinds of foods showed that the total content of sulfur-containing amino acids in cereals, sweet potatoes, pork and beef was 4.10 (3.42 ~ 4.47)%, 4.19 (3.66 ~ 4.72)%, 3.68% 3.67%, which reached and exceeded the total sulfur amino acids (3.52%) of FAO / WHO Reference Protein. The food content of fish and other aquatic animals was 3.32 (2.68-3.71)% and 3.24 (2.52-3.69)%, Slightly lower than that of “reference protein”; however, the total amount of sulfurous amino acids in soybean and other beans and seeds was significantly deficient, accounting for 2.39 (2.34 ~ 3.45)%, 1.64 (1.27 ~ 1.75)% and 2.95 3.29)%, of which non-soy beans total sulfur amino acids, only “reference protein” 1/2 weak. According to the previous urban dietary survey data, the nutritional status of sulfur-containing amino acids in Chinese people’s diet was calculated. Pointed out: In the usual diet of urban residents in our country, the absolute intake of sulfur-containing amino acids has reached or exceeded the appropriate requirements set by Rose. Therefore, in the case of low intake of legumes, lysine will remain the first limiting amino acid in dietary protein based on cereal protein. With a higher level of protein supplementation, consideration should be given to the suitability of the sulfur-containing amino acid intake.