Environmental Engineering Reference
In-Depth Information
BPA. A 2007 study found similar results: Sajiki et al. (2007) found on the
average0-842ng/gofBPAincannedfoods,whileinsimilarfoodspackaged
in glass and paper, the values were 0-14 and 0-1 ng/g, respectively. A
more recent study (NWSM, 2010) of 50 canned food items (including soup,
soda, vegetables, and fruit) found 92% of the contents to contain detectable
levels of BPA with a mean value of 77.4 ppb. Concentrations found are quite
variableasleachingdependsonthedurationofexposure,storageconditions
(especially temperature), as well as the pH of the contents.
Based on the known levels of BPA in food, water, and the ambient
environment, the daily intake of the EDC in units of µg/kg body weight/
day might be estimated. Western adult exposure via canned food is
approximately 1.5 units (European Food Safety Authority, EFSA, 2006)
much lower than the infant exposure expected via feeding from PC bottles
(4-13 units). BPA intake from this route accounted for 10-40% of the total
daily intake (van Goetz et al., 2010), and consuming canned soup for 5 days
increased the urinary BPA of adult subjects by 1000% (Carwile et al., 2011).
The Cao et al. (2011) study estimated the age-dependent dietary intake
of BPA to vary between 0.082 and 0.23 for infants and 0.052 and 0.081
for adults, both in units of µg/kg body weight/day. Significantly, in that
population, nearly 75% of the dietary intake of BPA appears to be derived
from canned soups, meats, and vegetable (corn) consumption. The recent
estimates on intake of BPA summarized by Geens et al. (2011) show a lower
value of 33-47 ng/kg body weight/day on average in the United States.
Figure 7.1
shows the range of reported values.
