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- Joined: Mon Jul 26, 2010 12:10 pm
Im troubled with the method development of the determination of kresoxim methyl in tobacco. i need help
Screening of grapes and wine for azoxystrobin, kresoxim-methyl and trifloxystrobin fungicides by HPLC with diode array detection.
De Melo Abreu S, Correia M, Herbert P, Santos L, Alves A.
LEPAE-DEQ, Faculdade de Engenharia da Universidade do Porto, Portugal.
Abstract
The Quinone outside Inhibitors (QoI) are one of the most important and recent fungicide groups used in viticulture and also allowed by Integrated Pest Management. Azoxystrobin, kresoxim-methyl and trifloxystrobin are the main active ingredients for treating downy and powdery mildews that can be present in grapes and wines. In this paper, a method is reported for the analysis of these three QoI-fungicides in grapes and wine. After liquid-liquid extraction and a clean-up on commercial silica cartridges, analysis was by isocratic HPLC with diode array detection (DAD) with a run time of 13 min. Confirmation was by solid-phase micro-extraction (SPME), followed by GC/MS determination. The main validation parameters for the three compounds in grapes and wine were a limit of detection up to 0.073 mg kg(-1), a precision not exceeding 10.0% and an average recovery of 93% +/- 38.
PMID: 16019828 [PubMed - indexed for MEDLINE]
Hope that will help. Otherwise please check out the application databases of the manufacturers and look for Pesticides analysis. Good luck.
