The Effects of Pretreatment with Dipping Solution on Variation of Bos-calid Residue in Grape Samples During Drying Process with Natural Sunlight

Year 2017, Volume: 13 Issue: 3, 609 - 614, 30.09.2017

Mustafa Cittan , Ali Çelik Kenan Dost

https://doi.org/10.18466/cbayarfbe.339312

Abstract

Field experiments were carried out to investigate the
variation of boscalid level during the drying period in grape samples that were
pretreated and untreated with a dipping solution named POTAS prior to natural
sunlight drying. Grape samples were collected at harvest and on the 3^rd,
7^th and 10^th days after harvest (during the drying
process of the pretreated and untreated grapes). Initially, 360 different
pesticides were scanned qualitatively by GC-MS and LC-MS/MS after QuEChERS (Quick,
easy, cheap, effective, rugged and safe) extraction method and only boscalid
was observed in grape samples. Consequently, study was concentrated on boscalid
extraction and analysis. Boscalid residues were extracted and cleaned up using
QuEChERS method. The analysis method shows a good linearity over the
concentration range of 0.010-0.125 mg kg^-1 with a correlation
coefficient value of 0.998. Recoveries of the extraction and the analysis
methods ranged from 74.8 to 100.8% within 0.7-1.7 % RSD at three different
concentration levels. Detection and quantification limits were 0.77 and 2.55 µg
kg^-1, respectively. The uncertainty of the method was calculated as
0.100±0.040 mg kg^-1. The results showed that grapes pretreated with
the dipping solution prior to drying process showed shorter drying times and
higher boscalid degradation rate than those untreated.

Keywords

Boscalid, degradation, GC-MS, QuEChERS, raisin

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