In present study, a DLLME-HPLC-UV method was developed and validated for the extraction, pre–concentration, and subsequently quantification of vitamin D3 (Vit D3) in milk and yogurt samples. In order to be able to extract Vit D3 from studied samples efficiently, the DLLME procedure was optimized with respect to the parameters affecting the extraction efficacy, w...

We describe an integrated micro-liquid chromatograph/ mass spectrometer (micro-LC/MS) system capable of performing routine determinations for 1-10 ng of drugs and their metabolites extracted from biological fluids. The micro-LC is constructed from conventional “high-performance” liquid-chromatographic instrumentation by using commercially available components. The mass spectrometer is operated ...

Currently, most of the feature extraction methods based on micropatterns are application oriented. The micro-patterns are intuitively userdesigned based on experience. Few works have built models of micro-patterns for feature extraction. In this paper, we propose a model-based feature extraction approach, which uses micro-structure modeling to design adaptive micro-patterns. We first model the ...

A very simple, rapid and sensitive dispersive liquid-liquid microextraction (DLLME) followed by gas chromatography and flame ionization detection (GC-FID) was developed for the determination of phenol and carvacrol in honey samples. A mixture of 100 µl dichloromethane (extraction solvent) and 0.5 ml acetonitrile (disperser solvent) was rapidly injected into sample solution. Thereby a cloudy sol...

Liquid crystal micro-particles are functional materials possessing optical and dielectric anisotropies originating from the arrangement of rod-like molecules within the particles. Although they can be switched by an electric field, particles dispersed in isotropic hosts usually cannot return to their original state, because there is no restoration force acting on the particles. Here, we describ...

background and objectives: a method was developed and validated for determining 15 polycyclic aromatic hydrocarbons (pahs) in refined olive and refined pomace olive oils using high performance liquid chromatography coupled with a fluorescence detector. materials and methods: the sample preparation involved liquid–liquid extraction with organic solvent and low temperature clean-up. the low tempe...

A rapid, simple and sensitive high-performance liquid chromatography method was developed for determination of ciprofloxacin in plasma by means of ultraviolet detection. Ofloxacin was used as an internal standard and separation carried on a Novapak C18 column using a mobile phase of 0.01 M phosphate buffer (pH =2.6): methanol (82: 18 v/v). Extraction of drug was performed from plasma by liquid-...

a very simple, rapid and sensitive dispersive liquid-liquid microextraction (dllme) followed by gas chromatography and flame ionization detection (gc-fid) was developed for the determination of phenol and carvacrol in honey samples. a mixture of 100 µl dichloromethane (extraction solvent) and 0.5 ml acetonitrile (disperser solvent) was rapidly injected into sample solution. thereby a cloudy sol...

The extraction of Terbium (III)from aqueous nitrate solutions with a supported liquid membrane was investigated using a mixture of di-(2-ethylhexyl phosphoric acid (D2EHPA) and tri-octyl phosphine oxide (TOPO) with a molar ratio 1/0.4. The Hydrophobic Polyvinylidene Fluoride (PVDF) membrane was used as solid support. The sorption process followed pseudo-second-o...