Determination of Residual Solvents in Faeces Bombycis Extract by GC / 中国药师

ABSTRACT

Objective:To establish a method for the determination of solvent residues in faeces bombycis extract by GC .Meth-ods A GC-headspace injection method was adopted to detect the residual organic solvents in the extract of faeces bombycis .A DB-5MS (30 m ×0.25 mm ×0.25 μm) quartz capillary column was used as the chromatographic column;nitrogen was used as the carrier gas at a flow rate of 0.6 ml· min-1;the injector temperature was 200℃;the detector was a flame ionization detector( FID) with the temperature of 250℃;the temperature program included two phasesthe initial temperature was set at 40℃for 10 min, and then risen to 200℃at a rate of 5℃· min-1 and maintained for 5 min;the equilibrium temperature of headspace was 95℃;the equilibrium time was 30 min;the capillary temperature was 110℃;the injection ring temperature was 125℃.Results:The linear range of acetone , 2, 3-dimethylpentane, 3-methylhexane, heptane, 2,2-dimethylhexane, p-xylene, m-xylene, O-xylene and 2,4,6-collidine was 101-3 034μg· ml-1 , 100-2 995 μg· ml-1 , 107-3 197 μg· ml-1 , 101-3 019 μg· ml-1 , 99-2 962 μg· ml-1 , 45-1 358 μg· ml-1 , 44-1 325μg· ml-1, 47-1 411 μg· ml-1 and 104-3 130 μg· ml-1, respectively, and the average r was all above 0.992.The recovery of the method met the requirement , and the blank solvent showed no interference .Eight samples were all accordance with the requirements after the examination .Conclusion:The headspace injection method for the determination of residual organic solvents in the extract of faeces bombycis is simple and reliable .