Methods Using HP-INNOWAX polyethylene glycol capillary(30.0 m×250 μm×0.25 μm). The column temperature rise by programming. Injector temperature is at 200℃.
The column temperature was increased by programming with the sample entrance and detector being at250℃. The carrier gas was nitrogen. The flow rate was1ml/min and shunting ratio was25∶1.N-octyl alcohol was used as internal standard.
Study of Organosulfur Compounds in Fresh Garlic by Gas Chromatography/Mass Spectrometry Incorporated with Temperature-Programmable Cold On-Column Injection
The injector temperature is 250℃ and the detector temperature is 280℃. Ligustilide was determined by means of GC - MS with selected ion and qualifier ion monitoring.
Initial temperature is 110℃and maintains 1 min, final temperature is 180 ℃, rise rate is 3℃·min-1, the injector temperature is 220℃, the detector temperature is 250℃, 5 mL·min-1 as N2 flow rale.
For the analysis of organosulfur compounds in fresh garlic,a gas chromatographic/mass spectrometric(GC/MS) method is proposed using temperature-programmable cold on-column injection and cold solvent extraction of the fresh garlic.This was carried out under the conditions of cryogenic process from extraction to column separation.Hence,a valid identification can be achieved about the primary components in garlic extract before thermo-degradation.The obtained results showed that 3-vinyl-4H-1,2-dithiin and 2-vi...
It is studied in this paper the two analysis methods of light hydrocarbon in crude oil(≤C15) with temperature programming sample injection(PTV) and back-flow GC analysis respectively.Based on the optimized choosing of pressure(P1,P2) and pressure changing time and speed control,the light hydrocarbon(≤C15) in crude oil is determined successfully.The heavy components are cut out.The column is protected.The resolution of several components which are hard to separate is better than that requested by GB/T18430.1...