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. Author manuscript; available in PMC: 2008 Nov 18.
Published in final edited form as: J AOAC Int. 2004;87(1):1–14.

Table 2.

Single-laboratory validation data: Linearitya

Alkaloid Slope Intercept R2 Avg.
recovery, %
NE 0.4758 0.0620 0.9979 98.1
EP 0.5308 0.1410 0.9989 99.7
PS 0.5508 −0.0463 0.9995 100.0
ME 0.4690 −0.0074 0.9999 99.6
MP 0.4904 −0.0270 0.9998 100.2
a

NE = Norephedrine; EP = ephedrine; PS = pseudoephedrine;ME = methylephedrine; MP = methylpseudoephedrine.