aluminum oxide/hymenoxys rusbyi

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Activated aluminum oxide selectively retaining long chain n-alkanes: Part II. Integration into an on-line high performance liquid chromatography-liquid chromatography-gas chromatography-flame ionization detection method to remove plant paraffins for the determination of mineral paraffins in foods and environmental samples.

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Aluminum oxide activated by heating to 300-400 degrees C retains n-alkanes with more than about 20 carbon atoms, whereas iso-alkanes largely pass non-retained (with characteristics described in more detail in Part I). This property is useful for the analysis of mineral oil contamination of foods and

Multi-residue determination of pesticides in vegetables by gas chromatography/ion trap mass spectrometry.

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To monitor possible contamination of edible vegetables by common pesticides, an analytical method using gas chromatography combined with ion trap spectrometry (GC-IT/MS) was developed to measure simultaneously up to 39 pesticide residues, belonging to organophosphors, organochlorines, pyrethroids or

Quantitative determination of organochlorine pesticides in sewage sludges using soxtec, soxhlet and pressurized liquid extractions and ion trap mass-mass spectrometric detection.

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A new analytical method is described for the determination of organochlorine pesticides (OCPs) in sewage sludges using GC-ion trap-MS-MS. In this work, 16 organo-chlorine pesticides (OCPs) listed by the US Environmental Protection Agency (US EPA) as priority pollutants were separated and quantified.

[Determination of residues of organochlorine insecticides and polychlorinated biphenyls in cereals, feeds and water].

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A semimicro method for the quantitative determination of chloro-organic insecticides (COI) and polychlorinated biphenyls (PCB) in cereals, feed-pellets and water is presented. The extraction of the active compounds is carried out with n-hexane or dichloromethane. The extracts of cereals and pellets

[Carcinogenicity and organic fraction of indoor inhalable particles].

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The inhalable particles in high and low incidence area of lung cancer in Xuanwei country were extracted with dichloromethane. The extract was separated into aliphatics, PAH, N-PAH, H-PAH, polar compounds by neutral aluminum oxide column chromatography. Mutagenicity and carcinogenicity of different

Development and optimization of a method for determining betaine and trigonelline in the fruits of Lycium species by using solid-phase extraction combined with HPLC-diode array detector.

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Betaine is an essential nutrient for humans and a source of methyl donors for methionine and S-adenosylmethionine formation, and it is used as a biomarker for pharmacological activities and to evaluate the quality of Lycium species and common foods. However, because of its special structural

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