Black A E, Ashby D R, Day K C, Bates C J, Paul A A
Hum Nutr Appl Nutr. 1983 Feb;37(1):9-22.
During a longitudinal study of vitamin C nutrition in 23 healthy elderly people, samples of cooked vegetables and liver, canned meats, canned vegetables and fruit drinks were analysed for vitamin C content. The analytical data are presented here and the effect on calculated daily intake of vitamin C of using the analytical values in place of food table values is assessed. For cooked foods the analysed values were close to food table values; exceptions were spring cabbage, cauliflower and canned potatoes. Fortified fruit drinks contained 20-60 mg vitamin C per 100 ml and made an important contribution to intake. Canned meats contained 0.3-61.4 mg per 100 g (mean 14.9 mg), but their contribution to intake was considered small. The difference between daily intakes calculated using analytical and food table values was greater than 5 mg in 37 per cent of 1-day periods and in 17 per cent of 7-day periods. These differences were not sufficient to significantly alter the correlations between intake and biochemical indices found in the original study. Nevertheless, given the discrepancies between calculated and analysed vitamin C intakes reported in the literature, analytical work is probably essential in studies of vitamin C nutrition.
在一项针对23名健康老年人的维生素C营养纵向研究中，对熟蔬菜、肝脏、罐装肉类、罐装蔬菜和果汁饮料样本的维生素C含量进行了分析。此处呈现分析数据，并评估使用分析值代替食物表值对计算出的维生素C每日摄入量的影响。对于熟食，分析值与食物表值接近；例外情况是春甘蓝、花椰菜和罐装土豆。强化果汁饮料每100毫升含有20 - 60毫克维生素C，对摄入量有重要贡献。罐装肉类每100克含有0.3 - 61.4毫克（平均14.9毫克），但它们对摄入量的贡献被认为较小。在37%的单日时间段和17%的7日时间段内，使用分析值和食物表值计算出的每日摄入量差异大于5毫克。这些差异不足以显著改变原始研究中发现的摄入量与生化指标之间的相关性。然而，鉴于文献中报道的计算出的和分析出的维生素C摄入量之间存在差异，在维生素C营养研究中进行分析工作可能至关重要。
