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食物的各种营养素含量随品种及生长地区而有不同。为了了解和改进不同地区人民的营养状况,首先必须了解该地区食物品种的特點并测定营养成分的含量。本此目地,我们测定了开封地面68种常见的蔬菜果品中胡蘿蔔素的含量,以供有關方面参考。我们所采用的方法是中央卫生研究院营养系的氧化镁吸附方法。但由於我们所用的氧化镁(E.Merek)为极细的粉末,又无Supper-cel以增加过滤速度,若氧化镁柱过紧则过滤速度太慢,若太松则洗脱时氧化镁柱中间常常出现漏洞。为了克服这种困难,我们改用口径较大的分析管(2×15厘米),同时氧化镁必须装得松紧合宜,即将
The nutrient content of food varies with variety and growing area. In order to understand and improve the nutritional status of people in different regions, we must first understand the characteristics of the food species in the area and determine the content of nutrients. For this purpose, we measured the content of carotenoids in 68 kinds of common fruits and vegetables in Kaifeng ground for the reference of relevant parties. The method we use is the magnesium oxide adsorption method of the Institute of Nutrition at the Institute of Health Sciences. However, because we use magnesium oxide (E.Merek) is a very fine powder, no Supper-cel to increase the filtration rate, if the magnesium oxide column is too tight, the filtration rate is too slow, if too loose, the column of magnesium oxide There are often loopholes in the middle. In order to overcome this difficulty, we use a larger caliber analysis tube (2 × 15 cm) and at the same time magnesia must be loosely fitted