| Enrichment time (h) | Ct value | Concentration (ng/ul) | Purity (260/280) | |
| Brand A | 4 | 24.71 | 812.91 | 1.89 |
| 8 | 25.80 | 900.36 | 1.87 | |
| 12 | 15.41 | 753.88 | 1.84 | |
| Brand B | 4 | 20.63 | 872.61 | 1.87 |
| 8 | 22.61 | 993.41 | 1.87 | |
| 12 | 19.08 | 954.44 | 1.87 |
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