Figure 1.
Average 1H-NMR spectra of four herbal extracts: AR, ASR, mixture of AR + ASR, and Danggui Buxue Tang (DBT). Spectra represented the mean of 5 replicates for AR, ASR, and DBT. For comparison, the spectrum AR + ASR was plotted by summing up spectra of AR and ASR in the ratio 5 : 1 to simulate the profile of a 5 : 1 mixture of AR extract and ASR extract. By visual inspection, the average 1H-NMR spectra of the DBT, AR, and AR + ASR showed a very similar profile but observable differences in the finer details. Abbreviations: AR: Astragali Radix; ASR: Angelica Sinensis Radix; DBT: Danggui Buxue Tang; AR + ASR: Astragali Radix + Angelica Sinensis Radix.