Table 2 Antibacterial activity test using E.coli and S. aureus. The viable bacteria were monitored by counting the number of colony-forming units (CFU).

From: Fabrication of silver nanoparticles-deposited fabrics as a potential candidate for the development of reusable facemasks and evaluation of their performance

Sample code

Duration of treatment (h)

t0

t1

t3

 

CFU ml-1

N/N0

Reduction in viability (%)

CFU ml-1

N/N0

Reduction in viability (%)

CFU ml-1

N/N0

Reduction in viability (%)

E. coli

 0

1.5 × 108

1

0

1.5 × 108

0

100

1.5 × 108

0

0

 1

1.5 × 108

1

0

0

–

100

0

–

100

 2

1.5 × 108

1

0

0

–

100

0

–

100

 3

1.5 × 108

1

0

0

–

100

0

–

100

 4

1.5 × 108

1

0

0

–

100

0

–

100

 5

1.5 × 108

1

0

0

–

100

0

–

100

 6

1.5 × 108

1

0

0

–

100

0

–

100

 7

1.5 × 108

1

0

0

–

100

0

–

100

 8

1.5 × 108

1

0

0

–

100

0

–

100

S. aureus

 0

2 × 108

1

0

2 × 108

0

0

2 × 108

0

0

 1

2 × 108

1

0

1.5 × 107

7.5 × 10–2

92.50

0

–

100

 2

2 × 108

1

0

1 × 105

5 × 10–4

99.95

0

–

100

 3

2 × 108

1

0

2 × 105

1 × 10–3

99.90

0

–

100

 4

2 × 108

1

0

1 × 106

5 × 10–3

99.50

0

–

100

 5

2 × 108

1

0

2 × 106

1 × 10–2

99.00

0

–

100

 6

2 × 108

1

0

1.5 × 106

7.5 × 10–3

99.25

0

–

100

 7

2 × 108

1

0

1.5 × 106

7.5 × 10–3

99.25

0

–

100

 8

2 × 108

1

0

2 × 106

1 × 10–2

99.00

0

–

100

  1. N/No: survival fraction, Sample 0 (Uncoated fabric), Samples 1–4 and 5–8 (NS-coated fabrics at 2, 10, 20, and 50 mM silver nitrate concentrations, and 25 and 50 min sonication time, respectively).
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