Simultaneous Determination of Three Coumarins in <i>Angelica dahurica</i> by <sup>1</sup>H-qNMR Method: A Fast and Validated Method for Crude Drug Quality Control

<div><sup>1</sup>H NMR spectrum of the internal standard and the reference standard in the DMSO-d<sub>6</sub> solvent: (1) hydroquinone, (2) imperatorin, (3) byakangelicin, (4) oxypeucedanin, (5) isoimperatorin, and (6) bergapten; (A) 7.68 ppm, (B) 7.38-7.39 ppm, (C) 6.55 ppm, (D) 6.38-6.39 ppm, (E) 4.98-4.99 ppm, (F) 4.26 ppm, (G) 3.33 ppm, and (H) 2.5 ppm.</div>

Journal of Analytical Methods in Chemistry

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Figure 2

Figure 2: Simultaneous Determination of Three Coumarins in <i>Angelica dahurica</i> by <sup>1</sup>H-qNMR Method: A Fast and Validated Method for Crude Drug Quality Control 

Figure 2 | Simultaneous Determination of Three Coumarins in Angelica dahurica by 1H-qNMR Method: A Fast and Validated Method for Crude Drug Quality Control 