Standard chromatogram of content determination
| Column | Welch Ultisil XB-C8 4.6×250mm，5μm (P/N: 00202-31043) |
| Mobile Phase | Potassium dihydrogen phosphate solution (take 10.54 g potassium dihydrogen phosphate, dissolved in 775 ml water, adjust the pH to 2.5 with phosphoric acid) – acetonitrile (775: 225) |
| Detector | 210nm |
| Temperature | 25℃ |
| Flow Rate | 1ml/min |
| Injection Volume | 10ul |
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