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发表于 2020-5-29 11:01:50
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Response factor: the response (e.g. peak area) of drug substance or related substances per unit weight.
RF= peak area / concentration (mg/ml)
Relative response factor (RRF):
RRF=RF impurity / RF API, OR,
RRF=slope impurity / slope API
Rifampicine: y =31.312 x + 4.963
Rifampicine Quinone: y = 26.198 x + 1.154
RRF= 26.198 / 31.312=0.84
To review:
a) RRF calculation, and
b) if RRF is properly used in the final calculation for % impurity
If RRF within 0.8-1.2, correction may not be necessay
Correction factor= 1/RRF, the reciprocal of the RRF
摘自“Method and Validation basics—HPLC case study”
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