Polar organic chemical integrative samplers (POCIS) are useful for monitoring a wide range of chemicals, including polar pesticides, in water bodies. However, few calibration data are available, which limits the use of these samplers for time-weighted average concentration measurements in an aquatic medium. This work deals with the laboratory calibration of the pharmaceutical configuration of a...

A series of pseudosymmetrical structures of formula K10(M2OnF11-n)3X (M = V and Nb, n = 2, X = (F2Cl)1/3, Br, Br4/2,I4/2; M = Mo, n = 4, X = Cl, Br4/2, I4/2) illustrates generation of polar structures with the use of Λ-shaped basic building units (BBUs). For a compound to belong to a polar space group, dipole moments of individual species must be partially aligned. Incorporation of d(0) early t...

Edible peanut seed represents approximately forty percent of the total mass of the peanut plant at harvest. This plant material is a potential source of nutraceutical compounds. Aqueous acetone was used to extract polar compounds from the leaves and roots of peanut plants, and from the shells of peanut seeds. The antioxidant activities of the extracts using ORAC were determined and compared. Th...

Headspace solid-phase microextraction (SPME) is a fast and simple sampling method for analysis of volatile compounds, but quantitation can be affected by sample matrix and sampling conditions. Sampling time and temperature are particularly important in controlling analyte response, and the effects vary for different compound classes and volatilities. Tests with model solutions containing a rang...

We have constructed a group contribution method for estimating Kováts retention indices by using observed data from a set of diverse organic compounds. Our database contains observed retention indices for over 35,000 different molecules. These were measured on capillary or packed columns with polar and nonpolar (or slightly polar) stationary phases under isothermal or nonisothermal conditions. ...

This work focuses on the development of nanoparticle-based layer-by-layer (LbL) coatings for enhancing detection sensitivity and selectivity volatile organic compounds (VOCs) using on-chip mid-infrared (MIR) waveguides (WGs). First, we demonstrate construction conformal polymer/mesoporous silica nanoparticles (MSNs) surface Si-based WGs LbL technique evaluate coating deposition conditions, such...

Aromatic plants are a reservoir of secondary metabolites that responsible for the plants' medicinal efficacy and major source aromatic compounds essential oils. Now day, there is renewed interest in plant kingdom search novel bioactive fragrance as demands herbal products increasing enormously. In present study two endemic plants, Pinda concanensis Heracelum grande from Western Ghats were analy...

A system of purge and trap (P&T), gas chromatography (GC), and mass spectrometry (MS) was used to determine 84 volatile organic compounds at the ppt (parts per trillion) level targeted by EPA method 524.2. This was accomplished without the use of cryofocusing. The optimized system consisted of an HP 7695 P&T concentrator and autosampler; an HP 6890 Series GC with a volatiles interface (VI); a w...