Table 5.
Levels of BPA analytes (ng/mL) in mid-gestation umbilical cord serum, Northern and Central California, 2010-2012 (n=85)
| BPA Analyte | LOD (ng/mL) |
% > LOD |
Geometric Mean, (GSD) |
min | 5th | 25th | Median | 75th | 95th | max |
|---|---|---|---|---|---|---|---|---|---|---|
| BPA | 0.05 | 47% | 0.16 (7.22) | <LOD | <LOD | <LOD | <LOD | 0.06 | 9.91 | 52.26 |
| BPA glucuronide | 0.05 | 76% | 0.14 (3.30) | <LOD | <LOD | .05 | 0.12 | 0.28 | 0.96 | 5.41 |
| BPA in glucuronide forma | --- | --- | 0.08 (1.19) | <LOD | 0.07 | 0.54 | 3.05 | |||
| BPA sulfate | 0.025 | 96% | 0.32 (4.89) | <LOD | 0.04 | 0.08 | 0.24 | 0.95 | 8.71 | 12.65 |
| BPA in sulfate forma | --- | --- | 0.24 (1.61) | <LOD | 0.18 | 6.45 | 9.37 | |||
| Total BPAb | --- | --- | 0.79 (1.54) | 0.08 | 0.11 | 0.20 | 0.80 | 1.64 | 10.81 | 62.77 |
| Conjugated BPA-BPA Ratioc | --- | --- | 0.42 (2.26) | 0.004 | 0.02 | 0.13 | 0.31 | 1.62 | 14.41 | 412.54 |
a
BPA in glucuronide form=BPA glucuronide*0.5614. BPA in sulfate form=BPA sulfate*0.7404. The factors 0.5614 and 0.7404 are the ratios of the molecular weight of BPA to the molecular weights of BPA glucuronide and BPA sulfate, respectively.
b
Total BPA=BPA + BPA in glucuronide form + BPA in sulfate form.
c
Conjugated BPA=BPA in Glucuronide Form + BPA in Sulfate Form.