walnut is a hardwood tree which covers a wide area of the plantation forest and gardens. the objective of this study was the separation and identification of compounds produced from pyrolysis of walnut wood at fixed bed reactor under an inert gas atmosphere (nitrogen) at 350 oc for 20 minutes. the separation and identification of compounds from bio-oil treated with n,o-bis (tri methyl sailil) t...

Many natural products contain flavonoids that display biological effects when ingested by humans and animals. Flavonoids have received a great deal of research interest, especially for possible cancer and heart disease-preventive properties. The content and the quality of each flavonoid may be a key to their biological effects. The recent development of electrospray ionization mass spectrometry...

OBJECTIVE To develop an analytical method for simultaneously qualitative and quantitative determination of melamine and triazine-related by-products including ammelide, ammeline, and cyanuric acid in milk and milk products by gas chromatography-tandem mass spectrometry (GC-MS/MS). METHODS Melamine and triazine-related by-products namely ammelide, ammeline and cyanuric acid in the samples were...

A gas chromatography-mass spectrometry (GC-MS) method using the standard addition methodology was developed for the determination of glucuronolactone (GL) and glucuronic acid (DGuA) in four beverages categorized as detoxification, recovery, or energy drinks. The method features a precolumn derivatization step with a combination of BSTFA (N,O-bis(trimethylsilyl)trifluoroacetamide) and TMCS (trim...

Phthalate esters, alkylphenols, bisphenol A and their chlorinated derivatives are the suspected endocrine disrupters or mutagens. These compounds, commonly called endocrine disrupter chemicals (EDCs), are widely used as plastic additives, lacquers, resins, or surfactants and can be usually found in environmental samples, namely wastewaters. An accurate and reproducible gas chromatographic-mass ...

A sensitive analytical method to concentrate and determine extensively used UV filters in cosmetic products at (ultra)trace levels in water samples is presented. The method is based on a sample treatment using dispersive solid-phase extraction (dSPE) with laboratory-made chemisorbed oleic acid-coated cobalt ferrite (CoFe(2)O(4)@oleic acid) magnetic nanoparticles (MNPs) as optimized sorbent for ...

A gas chromatography with mass spectrometric detection (GC-MS) method was developed and optimized for the determination of 17 endocrine disrupting compounds (EDCs) in coastal water samples. The evaluated EDCs were from different origins and included estrogens, bisphenol A, alkylphenolethoxylates, alkylphenols, phytoestrogens and sitosterol (SITO). The EDCs were extracted from samples using Oasi...