Figure 4.

(A) Mean urinary FB₁ excreted per day (µg/24 h) by eight volunteers abstaining from consuming maize-foods for 3 days (PreD1), 3 days consuming 6 tortillas and 5 biscuits/days (D1–D3) followed by 3 days abstaining (PostD1-PostD3) (The PostD4 and PostD5 urine samples were not analyzed and samples for PostD2 and 3 were not available for one volunteer). The number of volunteers that were FB₁ positive over the total urine samples analyzed is shown above each error bar. Mean values with differing superscripts are significantly different. Inset in (A) is the mean cumulative FB₁ excreted in the urine as a percentage of the cumulative FB₁ intake. (B) FB₁ concentration (ng/ml) normalized to body weight (The results of the statistical analysis was the same as in (A)). Inset in (B) is the results of the re-analysis ((September 2010=9/10, n=3 replicates) of urine samples from four volunteers stored frozen and analyzed 1 year after the initial analysis (September 2009=9/09, n=1).