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Table 1 Calibration curves, LOD and LOQ of the investigated compounds

From: Antioxidant activity and components of a traditional chinese medicine formula consisting of Crataegus pinnatifida and Salvia miltiorrhiza

Analyte

Calibration curve

Linear range/μg

r

LOD/ng

LOQ/ng

Danshensu sodium

Y=547569X- 21458

0.09-6.80

0.9993

39.0

97.6

Protocatechuic aldehyde

Y=4413435X-17209

0.02-2.31

0.9999

2.0

20.0

Rosmarinic acid

Y=2057826X+15905

0.03-3.60

0.9995

8.6

34.6

Lithospermic acid

Y=1114788X-45648

0.08-8.00

0.9999

33.9

84.8

Salvianolic B

Y=1113657X- 91003

0.04-10.80

0.9998

10.7

42.8

Salvianolic A

Y=2744138X-38060

0.03-4.50

0.9997

6.0

30.0

Procyanidin B2

Y=630617X+1435

0.07-1.60

0.9996

25.0

75.0

(−)-Epicatechin

Y=682521X-3363

0.05-1.80

0.9997

14.0

56.0