中國人膳食、血液與小便中維生素A、葫蘿菔素、噻胺、核黃素及抗壞血酸含量之研究 (二) 全血與小便中總抗壞血酸含量及食物烹調時維生素C損失情形之研究

Studies on the Intake, Blood Level and Urinary Excretion of Vitamin A, Carotene, Thiamine, Riboflavin, and Ascorbic Acid in Chinese Men II. The Total Ascorbic Acid Levels of Fasting Whole Blood and Urine and the Loss of Its Content in Food During Cooking

陳尚球(Joseph S. Chen) ； 陳懋良(M.L. Chen) ； 楊書祥(S. C. Yang)

《化學》 45年3期 (1956/09) Pp. 143-148

https://doi.org/10.6623/chem.1956018

摘要

本研究為前文所述膳食改進試驗之一部分工作。試驗前後，經過兩次用Roe氏法分析360位健康成年男子禁食時之全血與小便中總抗壞血酸之含量。結果試驗前後營養普通兩組之總平均數值，前者為0.52 mg/100 ml.，後者為8.63 mg./24hr.，兩項數值均甚低小。雖不能絕對的表示維生素C之缺乏，但顯然有改進之必要。該360位試驗對象，原可由食物中獲得足量之維生素C；然由烹調而引起之損失，佔全量之37.92%，因而實際攝入量遂未達理想。彼等禁食時全血與小便之含量，所以低小之原因，或卽在此。

並列摘要

1. The total ascorbic acid levels of the fasting whole blood and urine of three hundred sixty normal healthy men who were divided into two dietary groups, control and experimental, were determined by Roe's spectrophotometric method. 2. The average values of the total ascorbic acid levels of the fasting whole blood and urine of the both group were comparable to each other during the pre-experimental period. The values for the control group were 0.295 ± 0.11 mg% and 3.12 ± 2.16 mg/day while those of the experimental group wore 0.329 ± 0.16 mg% and 4.80 ± 4.56 mg/day respectively. After four months of experimental periods with relative. improvement in their intakes of vitamin C, the corresponding values of the control group ware elevated to 0.528 ± 0.19 mg% and 6.00 ± 3.12 mg/day while those of the experimental group were even more significantly elevated to 0.930 ± 0.19 mg% and 20.6 ± 14.2 mg/day respectively. To what an extent do these values indicate the nutritional status of vitamin C of our experimental subjects was discussed. 3. It was found that about 37.92% of the total ascorbic acid content in foods was destroyed during the common practice of the Chinese way of cooking. The actual intake of vitamin C for the control group, after the correction due to this destruction has been made, was only 39.08 mg per day. This helps to explain why the total ascorbic acid levels of whole blood and urine of our experimental subjects were lower, by comparison than those of the Westerners. The significance in making this correction during dietary surveys was also discussed.