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Desta, K.T.,Kim, G.S.,El-Aty, A.M.A.,Raha, S.,Kim, M.B.,Jeong, J.H.,Warda, M.,Hacimuftuoglu, A.,Shin, H.C.,Shim, J.H.,Shin, S.C. Elsevier 2017 Journal of chromatography. B, Analytical technolog Vol.1053 No.-
Thymus schimperi is a highly localized and a rare plant endemic to Ethiopia. An optimized and validated high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (HPLC-ESI-MS/MS) method was applied to characterize 23 polyphenolic compounds found in ethyl acetate extracts of the plant. From those, flavones dominated and luteolin was the major component contributing 21.83% of the total composition (or 46.05+/-0.59g/kg of fresh sample weight). Validation data showed a determination coefficient (R<SUP>2</SUP>)≥0.997. Limits of detection (LOD) and quantification (LOQ) were 0.03-0.97 and 0.11-3.23mg/L, while recovery values spiked at 5 and 50mg/L were between 70.89-115.39 and 67.65-120.19%, respectively. Except for caffeic acid and epicatechin gallate, the relative standard deviations (%RSDs) were far below 15%, showing acceptable precision values. The plant extracts inhibited cell proliferation and induced cell death in human gastric adenocarcinoma (AGS) and liver hepatocellular carcinoma (HepG2) cancer cells. This is the first report of polyphenolic components from T. schimperi being characterized using HPLC-ESI-MS/MS. Being components of many edible vegetables, fruits, and spices, the identified polyphenols suggest that T. schimperi could be a potential food with promising health benefits.
Kim, S.W.,Abd El-Aty, A.M.,Rahman, Md.M.,Choi, J.H.,Lee, Y.J.,Ko, A.Y.,Choi, O.J.,Jung, H.N.,Hacimuftuoglu, A.,Shim, J.H. Butterworths ; Taylor Francis ; Elsevier Science 2015 FOOD CONTROL Vol.50 No.-
The effects of various household processes, including washing, boiling, frying, parboiling, and drying under different conditions (water amount, boiling times, and temperatures) on the residual levels of dimethomorph were evaluated in pepper fruits and leaves grown under plastic greenhouse conditions. The original quick, easy, cheap, effective, rugged, safe (QuEChERS) method (after modification) and liquid chromatography-tandem mass spectrometry (LC/MS/MS) were used for extraction and analysis to determine the sample residues. The results of recovery tests in processed and unprocessed pepper fruits and leaves ranged from 73.6 to 106.2% with relative standard deviations of 1.62-12.4%. Among various processes, washing and parboiling (78.4-85.8% at single and 75.7-89.9% at double dose) and drying after washing and parboiling (95.3-97.3% at single dose) were the most effective household methods to attenuate the analyte residues in pepper fruits and leaves, respectively. We conclude that processing leads to extensive reduction of pesticide residue levels in pepper fruits and leaves, particularly following washing and cooking operations.