Automated gel permeation system for rapid separation of industrial chemicals and organophosphate and chlorinated pesticides from fats

Determination of residual pesticides in olive oil by GC–MS and HPLC–MS after extraction by size-exclusion chromatography

“…Based on published data [1,2,3,4,5,6,7,8,9,10,11], we divided the pesticides used in olive growth into two groups. The first included pesticides that could be analyzed by gas chromatography and the second those that could be analyzed by liquid chromatography.…”

“…Pesticide use is subject to strict regulations, especially concerning residual levels in commercial foods (olives and olive oil). Several methods [1,2,3,4,5,6,7,8,9,10,11] have been developed for the analysis of pesticide residues in olive oil. These methods generally rely on liquid-liquid or liquid-solid extraction procedures, cleanup on a column and chromatographic separation techniques coupled with mass spectrometric detection, nitrogen-phosphorus detection (NPD) and flame photometric detection (FPD).…”

“…As a result, sample analysis time and cost are amplified. In order to get around this problem several authors [7,8,9,10] have used size-exclusion chromatography (SEC) as sample preparation method which involves separating pesticides (generally having low mass and small steric volume) from fats, fatty processed foods, fruit and vegetables. They employed this method off-line, coupled with chromatography (gas and liquid) because of the large quantity of extract recovered at the column SEC outlet.…”

Effects of Diet and Environmental Salinity on the Growth, Mortality, and Tissue Structure of Juvenile Striped Bass

“…Proximate composition of the feeds (Table 2) was determined by standard procedures of the Association of Official Analytical Chemists (AOAC 1984). Analyses of diets for selected vitamins, elements, and contaminants were conducted with standard procedures (Hopper 1982) by private laboratories (Lancaster Laboratories; Woodson-Tenent Laboratory, Memphis, Tennessee). The fatty acid profiles of diets were determined by gasliquid chromatography with procedures described in Jahncke et al (1989).…”

The separation of herbicides by micellar electrokinetic capillary chromatography

“…~2 number of methods, particularly spectrophotometric ,3], differential pulse polarographic [4] and gas chromatb~ [5][6][7][8][9][10][11][12][13][14][15][16][17][18], have been reported for the analysis of blC~des. A strong disadvantage of GC methods is that derivatization of the target compounds is necessary before the final measurements.…”