title: Gas chromatographic determination of formaldehyde in coffee via thiazolidine derivative.
abstract: Thiazolidine formed from trace quantities of formaldehyde in an aqueous solution containing cysteamine at pH 8 was extracted with chloroform and subsequently analyzed by a gas chromatograph equipped with a fused silica capillary column and a thermionic nitrogen-phosphorus specific detector. Recoveries of formaldehyde from the aqueous solutions at levels lower than 1 ppm were slightly over 100%. Quantitative analysis of formaldehyde in commercial brewed and instant coffees showed 3.4-4.5 ppm in the brewed and 10-16.3 ppm in the instant coffee.
mesh_terms: D000447:Aldehydes / Q000032:analysis; D002849:Chromatography, Gas; D003069:Coffee / Q000032:analysis*; D005227:Fatty Acids / Q000032:analysis; D005557:Formaldehyde / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D012997:Solvents; D013844:Thiazoles / Q000032:analysis
chemical_list: D000447:Aldehydes; D003069:Coffee; D005227:Fatty Acids; D012997:Solvents; D013844:Thiazoles; C001634:fatty aldehyde; D005557:Formaldehyde