Figure 4.

Sample peaks of BPA and NP, (3.3 min) BPA, (5 min) NP (A) standard BPA (4 μg/ml) & internal standard 20 μg/ml NP; (B) standard NP (20 μg/ml) & internal standard 2 μg/ml BPA; (C) tissue sample 25 μg/kg BPA & internal standard 20 μg/ml NP; (D) serum sample 25 μ/kg BPA & internal standard 20 μg/ml NP