Separation and analysis of hydrocarbon compounds, oxygen-containing compounds (alcohols, esters, ketones), basic and neutral nitrogen-containing compounds, and thiols using gas chromatography fixed liquid (with a maximum operating temperature of 190 ℃ and solvents of acetone, chloroform, dichloromethane, and methanol). A widely used non-ionic surfactant used to restore membrane components under mild denaturation conditions.