Ozonated olive oil was prepared by bubbling ozone-oxygen gas through olive oil until it solidified. Hand C-NMR spectra of the ozonated oil showed that all C-C double bonds in triacyglycerols were converted to ozonide. The spectra also showed no other structural change and the absence of degraded products of ozonide such as aldehydes and carboxylic acids. HPLC chromatogram of the oil showed thre...

Submit Manuscript | http://medcraveonline.com Abbreviations: SCs: Synthetic Cannabinoids; Δ-9-THC: Delta9-TetraHydraCannabinol; UHPLC: Ultra High Performance Liquid Chromatography; DAD: Photodiode Array; MS: Mass Spectrometry. GC: Gas Chromatography; DART: Direct Analysis in Real Time; TOF: Time of Flight Spectrometry; NMR: Nuclear Magnetic Resonance; ATR: Attenuated Total Resonance; FTIR: Four...

Citrullus colocynthis (L.) (C. colocynthis), commonly known as Handal in Yemen and other Arabic countries, is a plant with wide range of pharmacological properties. These properties are attributed to secondary metabolites, phytochemicals, present the plant. In this study, seed C. were extracted using dichloromethane, resulting oil extract was screened identify active phytoconstituents gas chrom...

The Agilent Technologies mass selective detector (MSD) coupled with deconvolution reporting software (DRS) provides additional powerful data processing capabilities to the MSD ChemStation software. Reviewing full scan gas chromatography/mass spectrometry data for the confirmation of pesticide residues can be a labor-intensive and time-consuming process requiring great skill and concentration by...

With reversed-phase high-performance liquid chromatography we effected rapid and efficient separation of metabolites present in hemodialysate fluid from uremic patients on the artificial kidney. With an aqueous sodium acetate/methanol gradient as mobile phase, more than 50 ultraviolet-absorbing constituents were resolved in a 70-min chromatogram of a 100-mul sample of dialysate. Many of the met...

Uremic ultrafiltrates (and normal serum, for comparison) were fractionated by means of gel filtration. The collected fractions were further investigated by combined analytical techniques: "high-performance" liquid chromatography, gas chromatography, mass spectrometry, and isotachophoresis. Ultrafiltrate fractions in the so-called middle molecular mass region (Mr 500-2000) contained a considerab...

This is a review article concernning the development of a gas chromatographic analytical method for the analysis of 70 air toxic compounds. Not only the operating conditions, but also the column system is optimized. Optimization of the GC analytical methods for air toxic compounds is based on a unified method with a system comparising two columns. An optimization strategy with stepwise temperat...

A highly reproducible procedure was developed for gas-liquid chromatographic analysis of trimethylsilyl derivatives of normal human cerebrospinal fluid. Fourteen normal human cerebrospinal fluid samples tested with this procedure contained alpha- and beta-glucose as well as isomers of two unidentified sugars. Chromatographic changes in three cases of meningeal inflammation (two cryptococcosis a...

Interference by substances coeluting with targeted drugs is a general problem for gas chromatographic/mass spectrometric analysis of urine. To characterize these interferences, we examined human urine samples containing benzoylecgonine and fluconazole, and other drug combinations including deuterated internal standards that coelute (ISd,c) with target drugs, by selected-ion monitoring (SIM) and...