复杂基质导入技术分析洗发液中的过敏剂及芳香剂含量

GC-MS analysis of shampoo is generally difficult because the compounds of interest are present at low levels in a complex water and oil containing emulsion. Using DMI* the matrix influence of shampoo can be almost eliminated. A small aliquot of the shampoo is put into a small glass vial which is automatically inserted into the injector. The injector is then heated to 120°C just high enough to transfer the compounds of interest from the sample onto the chromatographic column. Only the vaporized compounds are transported from the injector onto the GC-column where they are refocused at the low starting temperature of the GC program. Because the non-volatile matrix species remain in the vial and the injector liner, no column contamination occurs. To automate the analysis a liner exchanger (LINEX) is used.