The usefulness of pyrolysis coupled to gas chromatography/mass spectrometry (Py-GC/MS) to evaluate the identity and reproducibility of different brands and batches of commercially available samples of Cymbopogon citratus Stapf (sold as tea) was investigated. Samples of the vegetable material were extracted using hexane and the extract was pyrolysed at 450 oC using a vertical microfurnace pyroly...

In this paper we describe our study on the characterization of cigarette samples according to their mineral content. Acid digestion assisted by microwaves was employed, and inductively coupled plasma optical emission spectrometry was the analytical technique used for the determination of Al, Ba, Ca, Cu, Fe, K, Mg, Mn, Na, P and Sr in conventional, light, and flavorized cigarettes. Multivariate ...

Characterization of petroleum-derived products is an area of continuing importance in environmental science, mainly related to fuel spills. In this study, a non-separative analytical method based on E-Nose (Electronic Nose) is presented as a rapid alternative for the characterization of several different petroleum-derived products including gasoline, diesel, aromatic solvents, and ethanol sampl...

Abstract The aim of this work was to determine which parameters are sufficient measure in order describe the water quality a pit lake and identify patterns data among different kind lakes. consisted ambient dose equivalent rate, elemental radionuclide concentration, pH, specific conductance surface sediment samples collected from types mines. Data were tested for normality log-normality used pr...

BACKGROUND Isodon lophanthoides, I. lophanthoides var. graciliflorus and I. serra are the three botanical sources of Xihuangcao, which are often used indiscriminately in herbal products. The aim of this study was to develop a rapid and accurate analytical method to identify the three different botanical sources of Xihuangcao by combining UPLC-ESI-QTOF-MS with chemometrics analysis. METHODS Fi...

This study aimed to profile the metabolites, piperine content, and biological activities (antioxidant, anti-inflammatory, anticancer, antibacterial, apoptotic cell) of 15 samples Piper nigrum L. from various geographic regions Thailand. UHPLC-QTOF-MS was applied establish alkaloid profiles P. samples. PCA HCA analysis showed that PN-1, PN-2, PN-11 sources differed significantly those other in t...

Aims: This study aimed to evaluate the effect of contact lens materials on structural properties and examine ultraviolet (UVA part) visible (Vis) transmittance with without UV filters commercially available silicone hydrogel (SiHy) bio-hydrogel (bio-Hy) soft lenses (CLs) in vitro.
 Place Duration Study: Hacettepe University, Department Physics, Ankara, Turkey, between May 2018 2021.
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The effects of five towns on river water pollution were examined along the Łyna River (southern watershed of the Baltic Sea, northern Poland). The relationships among the spatially derived indicators of urbanization, environmental variables, and physico-chemical and microbiological data (heterotrophic plate count at 22 and 37 °C, and fecal coli) obtained from longitudinal river profiling have b...

Concentrations of ten elements (Cd, Cr, Cu, Fe, Ni, Pb, Se, Sr, V and Zn) were determinate in muscle tissues of 13 fish species from Aratu Bay, Bahia, Brazil by inductively coupled plasma optical emission spectrometry. The accuracy and precision of our results were checked by using two certified reference materials: BCR-422 cod muscle and SRM 1566b oyster tissue. The average trace element conce...

In this paper, we evaluate semiempirical methods (AM1, PM3, and ZINDO), HF and DFT (B3LYP) in different basis sets to determine which method best describes the sign and magnitude of the geometrical parameters of artemisinin in the region of the endoperoxide ring compared to crystallographic data. We also classify these methods using statistical analysis. The results of PCA were based on three m...