Determination of linuron in chamomile by LC-MS/MS using the QuEChERS extraction method
Određivanje linurona u kamilici LC-MS/MS tehnikom i QuEChERS metodom ekstrakcije
Author
Spirovic Trifunovic, Bojana
Vukovic, Gorica
Jovanovic-Radovanov, Katarina
Bursic, Vojislava
Meseldzija, Maja
Keywords
LinuronResidues
QuEChERS
LC-MS/MS
Chamomile
Ostaci
Kamilica
Metadata
Show full item recordAbstract
Linuron is a selective herbicide used for the control of broadleaf weeds. Its mode of action is
the inhibition of photosynthesis. The QuEChERS method for extraction of linuron residues from
chamomile was used. The LC–MS/MS method was used for determination of linuron residues. Its
linearity was studied in a range of 0.025-0.50 μg/ml using matrix-matched calibration, and the
determination coefficient (R2) was higher than 0.99. Blank chamomile samples were spiked with
linuron solution at three concentration levels yielding recoveries of over 90%. The internal standard
added in all samples was isoproturon–d6. There were no linuron residues in chamomile flowers,
while the residues ranged from 0.010 to 0.040 mg/kg in the flower stalk samples. Linuron je selektivni herbicid, koji se koristi za suzbijanje širokolisnih korova. Njegov
mehanizam delovanja je inhibicija fotosinteze (fotosistema II). Za ekstrakciju ostataka linurona
iz uzoraka kamilice korišćena je QuEChERS metoda. Određivanje nivoa ostataka linurona
vršeno je tečnom hromatografijom sa masenim spektroskopijom. Linearnost metode je
ispitivana u opsegu koncentracija od 0.025 – 0.50 μg/ml, korišćenjem metode kalibracije u
matriksu, pri čemu je koeficijent određivanja (R2) bio veći od 0.99. Tačnost metode je ispitivana
obogaćivanjem kontrolnih uzoraka kamilice na tri koncentraciona nivoa. Prinos ekstrakcije je
bio preko 90 %. Interni standard korišćen za analizu je bio izoproturon-D6. U cvetu kamilice
nisu nađeni ostaci linurona, dok su u uzorcima drške bili u opsegu od 0.010-0.040 mg/kg.