To investigate the content of eleven 4,4’-diaminostilbene-2,2’-disulfonc acid-based fluorescent whitening agents (DSD-FWAs) in food contact paper.MethodsThe paper samples were collected from the markets in Fuzhou and Xiamen, and then DSD-FWAs in samples were extracted with the mixed solvent of acetonitrile, water, and triethylamine (40∶1, V/V), separated on Symmetry C₁₈, and detected by fluorescence detector (FLD) and photo-diode array detector (PDA). ResultsThe percentage of samples DSD-FWAs detected was 41.4% (37/87), and the total contents of DSD-FWAs were ranged from 0.20 to 2 027 mg/kg. In four kinds of paper material, the problem of paper bags and instant noodle paper bowls are larger. All eleven DSD-FWAs were found in some samples, and the detectable rate and the average content of C.I.220 was the highest, and was 40.2% and 75.3 mg/kg respectively. The detection rate of six DSD-FWAs was greater than 10%. A few DSD-FWAs in one sample can be found simultaneously.ConclusionThe illegal adding of DSD-FWAs in food contact paper is common. So the relevant risk monitoring and supervision should be strengthened.