| Environmental sample | Bacterial DNA concentration (ng/ml)* | A260/280 | A260/230 | DNA concentration (ng/µl) before size selection, volume: 25 μl | DNA concentration (ng/µl) after size selection, volume: 25 μl |
| 1 | 0.11 (0.16) | 1.8 | 1.4 | 27 | 1.2 |
| 2 | 0.11 (0.20) | 1.8 | 1.3 | 27.4 | 3.3 |
| 3 | 0.10 (0.37) | 1.8 | 1.6 | 19.5 | 3.4 |
| 4 | 0.04 (0.04) | 1.5 | 0.5 | 24.4 | 1.6 |
| 5 | 0.11 (0.13) | 1.7 | 1.0 | 26.1 | 1.1 |
| 6 | 0.05 (0.03) | 1.5 | 0.7 | 15.2 | 0.4 |
| 7 | 0.01 (0.01) | 1.4 | 0.3 | 15.1 | 0.3 |
| 8 | 0.03 (0.05) | 1.6 | 0.7 | 17 | 0.9 |
| *Values indicate dsDNA concentration using a high sensitivity fluorescent nucleic acid quantitation assay. Number in parentheses represents concentration using a microvolume spectrophotometer. |
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