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用高效液相色谱法测定了北京地区１６０名４５～８０岁在职和离退休干部血清维生素Ａ和Ｅ水平，并记录了膳食维生素Ａ与胡萝卜素摄入情况。结果表明，受检者膳食维生素Ａ与胡萝卜素平均每日摄入量为１０４５．５０±７５４．６５视黄醇当量，达到及超过ＲＤＡ。血清维生素Ａ平均含量为１．５７±０．４６μｍｏｌ／Ｌ，血清维生素Ａ水平有随年龄增加而上升趋势。受检者中有１２．１％的人血清维生素Ａ含量低于正常水平。研究结果还表明血清维生素Ａ与维生素Ｅ的含量之间存在明显的正相关关系。
Serum vitamin A and vitamin E levels were measured in 160 active and retired cadres aged 45 to 80 in Beijing using high performance liquid chromatography (HPLC). The intake of dietary vitamin A and carotene was recorded. The results showed that the subjects dietary vitamin A and carotene average daily intake of 1045.50 ± 754.65 retinol equivalent, reaching and exceeding the RDA. The average level of serum vitamin A was 1.57 ± 0.46μmol / L, the level of serum vitamin A increased with age. Subjects, 12.1% of the serum levels of vitamin A below normal levels. The results also show that there is a clear positive correlation between serum vitamin A and vitamin E levels.