Establishment of Quality Evaluation Method for Yinqiao Powder: A Herbal Formula against COVID-19 in China

Figure 7

Chromatograms of yinqiao powder and negative control samples at 237 nm (a) and 327 nm (b). In panel a, 1. forsythoside A 2. phillyrin, 3. arctiin, S1. mixed reference, S2. negative control sample of Arctii Fructus, S3. negative control sample of Forsythiae Fructus, S4. Yinqiao powder. In panel b, 1. neochlorogenic acid, 2. chlorogenic acid, 3. forsythoside A, 4. isochlorogenic acid A, 5. isochlorogenic acid C, S1. mixed reference, S2. negative control sample of Lonicerae Japonicaeflos and Arctii Fructus, S3. negative control sample of Forsythiae Fructus, S4. negative control sample of Lonicerae japonicaeflos, S5. Yinqiao powder.

(a)

(b)