Quantification of folpet and phthalimide in tea and herbal infusions by LC– high-resolution MS and GC–MS/MS. Issue 1 (2nd January 2019)

• Record Type: Journal Article
• Authors: Huertas-Pérez, José Fernando; Ernest, Marion; Badoud, Flavia
• Is Part Of: Food additives & contaminants. Volume 36:Issue 1(2019)
• Page Start: 109
• Page End: 119
• Publication Date: 2019-01-02
• Subjects: Folpet -- phthalimide -- modified QuEChERS -- negative chemical ionisation -- atmospheric pressure ionisation -- high-resolution MS -- dry commodities -- tea and herbs; Food additives -- Periodicals; Food contamination -- Periodicals; 664.06
• DOI: 10.1080/19440049.2018.1555379
• Languages: English
• ISSNs: 1944-0049

Abstract

ABSTRACT: Two methods based on a modified QuEChERS sample preparation and either LC coupled to atmospheric pressure ionisation and high-resolution MS or GC coupled to electron ionisation and tripled quadrupole MS have been assessed for the quantification of folpet and phthalimide in tea and other dry herbal infusions. Both methods have been fully validated in green tea and further checked in black tea, verbena and rooibos, and they performed according to the SANTE/11813/2017 criteria at the target LOQ concentration level (50 µg/kg). These methods allow the accurate quantification of folpet in the selected matrices according to the new EU residue definition, which includes phthalimide. Phthalimide is the main metabolite and degradation product of folpet, although according to recent studies, it could be generated from different sources than folpet breakdown, such as food processing or analysis by GC.