Determination of Glycerin from a Marketed Personal Care Product Using Gas Chromatography

Table 2

System suitability, sensitivity, and precision study for the proposed method.

Parameters	Glycerin
System suitability
Retention time (min)	6.05 ± 0.21
Capacity factor	3.89
Resolution	5.68
USP tailing factor	1.79
USP theoretical plates ()	12461
Sensitivity
Limit of detection (LOD) (mg/mL)	0.01
Limit of quantitation (LOQ) (mg/mL)	0.05
Content of glycerin mL/100 mL (label claim = 10 mL/100 mL)	9.62 ± 0.17
Precision
Intraday
Repeatability (mg/100 mL) () ± %RSD	9.63 ± 0.17
Interday
Mean resorcinol content from hair tonic; preparation (mg/100 mL) (day 1/day 2/day 3); ()	9.61/9.64/9.59
(%RSD) (day 1/day 2/day 3) ()	0.21/0.16/0.19