BACKGROUND Morita Baylis Hillman (MBH) reaction is used to introduce carbon-carbon or carbon-heteroatom bond in a molecule. The major drawback of this reaction is the relatively low product yield and long reaction time. Though notable changes have been made to improve the reaction rate and yield of MBH adduct by various groups, a reliable synthetic procedure under ambient temperature in presenc...

Abstract. The emissions of volatile organic compounds (VOCs) from chemical products (VCPs) – specifically personal care products, cleaning agents, coatings, adhesives, and pesticides are emerging as the largest source petroleum-derived carbon in US cities. Previous work has shown that ambient concentration markers for most VCP categories correlates strongly with population density, except VOCs ...

Extracting volatile compounds using supercritical carbon dioxide (scCO2) is one of the most interesting applications of supercritical technology, due to the high solubility of these substances in scCO2. Supercritical carbon dioxide extraction (SFE-CO2) has been applied for obtaining extracts from several vegetable matrices, among them turmeric (Curcuma longa), because its volatile oil contains ...

BACKGROUND Approximately 40 million prescriptions were dispensed in the U.S. for asthma inhalers in 2006. Although the pervasive distribution of asthma inhalers warrants greater attention to possible misuse of these products, few investigations have examined asthma inhaler misuse. The purpose of this study was to describe the prevalence, correlates and consequences of asthma inhaler misuse amon...

Organic Solvent Resistant Nanocomposite Films Cellulose nanofiber (CNF) exhibits outstanding mechanical strength and chemical stability is suitable to be a matrix for the photocatalysts immobilization applied in pollutant removal. Entangled with self-precipitated Ag-doped TiO2 NFs, CNF composite film presents flexible dense hierarchical stacking. Through triggering photocatalytic reaction under...

the essential oils of branchlets and fruits of juniperus excelsa subsp. excelsa and juniperus excelsa subsp. polycarpos were examined for their antioxidant activity. the compositions of the essential oils were studied by gc and gc-ms. to evaluation the antioxidants activity of the volatile oils, pure components and positive controls at different concentrations, thin-layer chromatography (tlc) s...

The objective of this study is determination the volatile compounds of Matricaria chamomilla of an inorganic–organic hybrid material based on ZnO nanoparticles anchored to a composite made from polythiophene and hexagonally ordered silica (ZnO/PT/SBA-15) as a solid-phase fiber microextraction (SPME). Microextraction techniques with nanoparticles ZnO/PT/SBA-15 resulted in a more efficient analyt...

Volatile compounds of uncooked dry bean {Phaseolus vulgaris L.) cultivars representing 3 market classes (black, dark red kidney and pinto) grown in 2005 were isolated with headspace solid phase microextraction (HS-SPME), and analyzed with gas chromatography mass spectrometry (GCMS). A total of 62 volatiles consisting of aromatic hydrocarbons, aldehydes, alkanes, alcohols and ketones represented...