. Author manuscript; available in PMC: 2019 May 1.

Published in final edited form as: Anal Chem. 2018 Apr 13;90(9):5654–5663. doi: 10.1021/acs.analchem.7b05180

Table 1.

Quadratic Regression Data

	PQS	HQNO	C9-PQS	NQNO
MS¹m/z	260	260	288	288
MS²m/z	175	159	175	159
a	5.6E-04	1.2E-04	3.6E-03	3.1E-03
b	7.5E-03	1.5E-01	−5.0E-02	3.7E+00
c	−7.8E+00	−2.4E+00	0.0E+00	−6.1E+01
R²	0.980	0.996	0.998	0.998
Fragmentation factor	0.044	0.13	0.020	0.070
LLOQ [intensity]	1.4	0.99	0.96	12
ULOQ [intensity]	200	130	75	950
LLOQ [pmol × cm⁻²]	75	15	3.0	15
ULOQ [pmol × cm⁻²]	610	610	150	230