Table 2 Lung burden of AuNPs, AgNPs, and AuNP+AgNP co-exposure (ng/lung)

Single (ng of Au)^A

Retention %

Co-exposure (ng of Au)^B

Retention%

B/A

E-1 (4)

466 ± 34

–

313 ± 18

–

0.67 ± 0.04

PEO-1 (5)

8930 ± 742

100.0 ± 0

3607 ± 133^**

100.0 ± 0.0

0.40 ± 0.01

PEO-7 (5)

8048 ± 1308

90.1 ± 11.6

3137 ± 220^**

87.0 ± 6.1

0.39 ± 0.03

PEO-28 (5)

7010 ± 578

78.5 ± 6.5

2458 ± 224^a,**

68.2 ± 6.2

0.35 ± 0.03

Single (ng of Ag)^C

Retention%

Co-exposure (ng of Ag)^D

Retention %

D/C

E-1 (4)

47 ± 5

–

23 ± 1

–

0.49 ± 0.03

PEO-1 (5)

129 ± 15

100.00 ± 0.0

137 ± 6

100.0 ± 0.0

1.06 ± 0.05

PEO-7 (5)

90 ± 8

69.4 ± 5.8

72 ± 9^a

52.8 ± 6.6

0.80 ± 0.10

PEO-28 (5)

58 ± 11^a

45.0 ± 8.9

37 ± 5^a,b

27.4 ± 3.8

0.64 ± 0.09