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sample preparation	Dispersive (QuEChERS)
sample/matrix	3 g ground dandelion blossoms, homogenized in 10 mL water, spiked at 50ng/g
extraction tube	Supel™ QuE Acetate extration tube (55234-U)
extraction process	add 25 mL of acetonitrile; add contents of Supel™ QuE acetate extraction tube; shake immediately for 1 minute; centrifuge at 3400 rpm for 5 minutes
clean-up process	Transfer 1 mL of the acetonitrile layer into a Supel™ QuE PSA/C18 cleanup tube; shake for 1 minute; centrifuge at 3500 rpm for 3 minutes; (draw off 700 uL of supernatant, evaporate to dryness at 50 °C under nitrogen; reconstitute in 200 µL of 50:50 0.1% formic acid:0.1% formic acid in methanol)
clean-up tube	Supel™ QuE PSA/C18 tube (55288-U)
column	Ascentis^® Express C18, 10 cm x 3.0 mm I.D., 2.7 µm particles (53814-U)
column temp.	25 °C
mobile phase	[A] 0.1% formic acid in water; [B] 0.1% formic acid in methanol
gradient	30% B from 0 to 5 min; to 100% B in 0.2 min; held at 100% B for 5.3 min; to 30% B in 0.5 min; held at 30% B for 5 min
flow rate	500 µL/min
pressure	3800 psi (262 bar)
injection	3 µL
detector	MS, ESI(+), MRM, m/z 203.2/129.2, 271.2/225.0, 292.1/211.0, 256.0/175.2, 250.0/132.0, 223.2/126.0, 253.0/125.8

\r\n",":type":"cms-commons/components/content/table"},"table_296498194":{"anchorId":null,"enableSort":false,"verticalTable":false,"headline":"Description","title":null,"caption":null,"table":"\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n

Analysis Note	The advent of the die-off of honey bees due to colony collapse disorder (CCD) has spawned investigation into pesticide exposure as the cause. \r\nNeonicotinoids are among the suspected culprits. In this application, the QuEChERS approach using Supel^™ QuE was used for extraction and cleanup prior to analysis of seven neonicotinoid pesticides in flower blossoms. \r\nAscentis^® Express C18 was chosen due to the high efficiency associated with its Fused-Core^® particle, and its relatively low backpressure as compared to sub-2 micron UHPLC columns. This allowed the column to be used in a standard pressure HPLC system with a relatively high concentration of aqueous at the start of the mobile phase gradient.
Categories	Analytical Chromatography, SPE Applications, Pesticides & Herbicides, Pesticides
Featured Industry	Agriculture
suitability	application for HPLC

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