Table 7.

a. Powdered extract negative control spike recovery results (50% level)a
Level 1 (0.9%, w/w, total phenolics)
Analyte	Spiked concentration, µg/mL	Recovery, %	RSD, %
Caftaric acid	0.44	103	0.37
Chlorogenic acid	0.97	100	0.86
Cynarin	0.49	100	3.77
Echinacoside	23.9	98.5	0.46
Cichoric acid	18.7	98.3	0.39

b. Powdered extract negative control spike recovery results (100% level)a
Level 2 (1.8%, w/w, total phenolics)
Analyte	Spiked concentration, µg/mL	Recovery, %	RSD, %
Caftaric acid	0.88	98	4.44
Chlorogenic acid	1.93	97	0.77
Cynarin	0.97	103	1.40
Echinacoside	47.7	99.1	0.82
Cichoric acid	37.4	99.4	0.37

c. Powdered extract negative control spike recovery results (200% level)a
Level 3 (3.8%, w/w, total phenolics)
Analyte	Spiked concentration, µg/mL	Recovery, %	RSD, %
Caftaric acid	1.75	101	3.79
Chlorogenic acid	3.87	99.5	1.03
Cynarin	1.95	103	1.32
Echinacoside	105	98.3	0.35
Cichoric acid	74.8	102	0.75

^a125 mg of 99% maltodextran, 1% magnesium stearate.