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Method performance requirements
Gallic acid equivalent
(w/w)
A l ti l
5 500
na y ca range
– ppm
Limit of Quantitation (LOQ)
≤ 5 ppm
Recovery, %
80 – 110
5 – 30 ppm
≤ 12
Repeatability, %
>30 – 100 ppm
≤ 10
>100 – 500 ppm
≤ 8
Reproducibility, %
5 – 30 ppm
≤ 7
Comments Submitted (if any)
•
The reference NIST materials recommended was not certified for total
phenolics, so not sure how these NIST materials are appropriate to list.
Possibly include a sample purification step to remove interfering
d th th h li th FC
t
t ith f b tt
compoun s o er an p eno cs e reagen reac s w or e er
total phenolic value.
•
The SMPR has been revised to Estimate of Phenolic Content using
Folin‐C which is determined in the SRM.