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. Author manuscript; available in PMC: 2008 Nov 24.
Published in final edited form as: J AOAC Int. 2008 Jul-Aug;91(4):694–701.

Table 2008.04A.

Interlaboratory study results for hydrastine and berberine in goldenseal raw materials, extracts, and dietary supplements

Hydrastine
Berberine
Materiala Average (%,w/w) sR RSDR, % HorRat Average (%, w/w) sR RSDR, % HorRat
LPP-01-E01 3.03 0.132 4.38 1.29 2.86 0.196 6.86 2.01
LPP-01-E02 2.63 0.0703 2.68 0.44 2.71 0.153 5.66 1.64
LPP-01-E03 0.181 0.0103 5.75 1.11 0.175 0.0118 6.86 1.32
LPP-01-E04 2.45 0.0931 3.80 1.09 3.14 0.195 6.22 1.85
LPP-01-E05 3.01 0.176 5.86 1.73 3.05 0.219 7.17 2.12
LPP-01-E06 3.58 0.180 5.03 1.53 2.83 0.205 7.24 2.12
LPP-01-E07 2.32 0.154 6.65 1.89 3.09 0.204 6.62 1.96
LPP-01-E0 4502b 203 4.52 1.00 6021 462 7.68 1.78
a

LPP-01-E01 = Capsules containing goldenseal ground root powder, 550 mg/capsule; LPP-01-E02 = capsules containing goldenseal extract, 250 mg/capsule; LPP-01-E03 = capsules containing Echinacea purpurea root extract (680 mg) with goldenseal root extract (100 mg); LPP-01-E04 = goldenseal root powder; LPP-01-E05 = goldenseal root, ground to 80 mesh in originating laboratory; LPP-01-E06 = goldenseal root, ground to 80 mesh in originating laboratory; LPP-01-E07 = goldenseal ground root powder (certified organic); LPP-01-E08 = goldenseal ethanol tincture.

b

Results in μg/g. Original results reported in μg/mL by laboratories and converted to μg/g using density of 0.908 g/mL.