Table. 6. System suitability testing.
| Parameter | QUE | BDMC | DMC | CUR | ||||
|---|---|---|---|---|---|---|---|---|
| Mean | RSD (%) | Mean | RSD (%) | Mean | RSD (%) | Mean | RSD (%) | |
| Retention time, tR | 3.970 | 0.021 | 13.840 | 0.027 | 15.230 | 0.025 | 16.723 | 0.021 |
| Peak area | 11221611 | 0.806 | 286851 | 0.654 | 1590498 | 0.651 | 5448675 | 0.711 |
| Resolution, R | - | - | 32.195 | 0.321 | 2.887 | 0.364 | 2.830 | 0.370 |
| Tailing factor, Tf | 1.369 | 0.108 | 1.501 | 0.261 | 1.165 | 0.144 | 1.081 | 0.051 |
| Theoretical plate, N | 8803.785 | 0.359 | 15552.398 | 0.865 | 13763.145 | 0.646 | 15568.252 | 0.910 |
| Capacity factor, k’ | 0.684 | 0.846 | 4.870 | 0.415 | 5.460 | 0.406 | 6.093 | 0.391 |
RSD, relative standard deviation; QUE, quercetin; BDMC, bisdemethoxycurcumin; DMC, demethoxycurcumin; CUR, curcumin. N, number of theoretical plates; k’, capacity factor; Mean of six replicate injections of quality control (QC) standard of 160 μg/mL.