Two-phase partition chromatography using soybean oil eliminates pesticide residues in aqueous ginseng extract.

This study was carried out to develop a cost-, labor- and efficiency-effective elimination method of pesticide residues in ginseng extract. A two-phase partition method between soybean oil and distilled water or aqueous ginseng extract was employed for the elimination of pesticide residues. Content of the pesticides was determined by gas chromatography with electron capture or nitrogen phosphorus detector.

Contribution of individual polyphenolics to total antioxidant capacity of plums.

To study the effect of polyphenolics on antioxidant capacities of plums, the amounts of total phenolics, total flavonoids and individual phenolic compounds, and vitamin C equivalent antioxidant capacity (VCEAC) of eleven plum cultivars was determined. There was a good linear relationship between the amount of total phenolics and total antioxidant capacity (r2 = 0.9887).

Multiresidue method for the determination of pesticides in Korean domestic crops by gas chromatography/mass selective detection.

The multiresidue method used in this study allows the determination of 101 pesticides, including organophosphorus, organochlorine, and nitrogen-containing pesticides, in crops by gas chromatography with mass selective detector. Analysis was performed in the selected-ion monitoring mode, and the identities of the positive analytes were confirmed by retention time and the ratios of selected ions. The selected ion mode demonstrated an acceptable selectivity for most of the pesticides determined in 3 kinds of samples (Chrysanthemum coronarium; Perilla japonica, leaf; and Lactuca savita, which are very popular vegetables eaten raw in Korea), and very minor interferences were observed in the elution area of the pesticide analytes.

Estimation of risks of pesticide exposure, by food intake, to Koreans.

The aim of this study was to evaluate theoretical maximum daily intake (TMDI) and estimated daily intake (EDI) for Korean by using maximum residue levels (MRLs), food intake, residue data and correction factors, and compare with acceptable daily intake (ADI) in order to estimate the health risk based on the pesticide exposure. Then, the oncogenic risks of the pesticides were assessed from TMDI and estimated daily intake with treatment (adjusted EDI). The percent ratio of TMDI to ADI for 262 pesticides was mostly below 80%, but 42 pesticides (16.