Table 2. Cycle threshold (Ct) values obtained for Tribolium castaneum in 5 g of wheat flour used for regression analysis.
| Sample | m(DNA)/ng | N(insect equivalent) | Ct value |
|---|---|---|---|
| T. castaneum adult DNA diluted with wheat DNA | 200 | 10 | (16.8±0.02)a |
| 100 | 5 | (20.0±0.1)a | |
| 50 | 2.5 | (21.67±0.09)a | |
| 25 | 1 | (22.7±0.2)a | |
| 12.5 | 0.1 | (27.0±0.2)a | |
| 1.25 | 0.01 | (27.9±0.3)a | |
| 0.125 | 0.001 | (28.84±0.08)a | |
| Wheat DNA | 108 | NA | 34.4±1.2 |
aSignificant difference between all Tribolium DNA mass and wheat DNA at p<0.01 level of significance. Each value is represented as mean±S.D. (N=3). NA=not available