Abstract
Following the surveys carried out in 1964 and 1967, with the ratio of thiamine and riboflavin actually determined to various enriched foods to the amounts supposed to be added, further investigations were made in 1968 with 109 items of thiamine enriched and 49 items of riboflavin enriched foods.
The results showed that 43% of the former items and 45% of the latter items fell within 60-119% in ratios of the vitamins found to the amounts tc be enriched.
It was observed among the samples investigated throughout the period of 1964-1968 that some foods including noodles showed large coefficients of variation in ratios of the vitamins found to the amounts supposed to be added.
