Determination of Five Coumarins in Angelicae Pubescentis Radix from Different Origins by HPTLC-Scanning

Table 2

Standard curve.

Component	Linear regression equation	Correlation coefficient
Osthole	Y = 0.0584X + 14.6447	r = 0.9922
Columbianadin	Y = 0.0411X + 10.5898	r = 0.9873
Isoimperatorin	Y = 0.1943X + 179.3765	r = 0.9945
Oxypeucedanin	Y = 0.1607X + 0.5229	r = 0.9918
Imperatorin	Y = 0.2142X + 170.9726	r = 0.9935