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Jevgeni Parshintsev, Tuulia Hyötyläinen, Kari Hartonen, Markku Kulmala, Marja-Liisa Riekkola
Atmospheric aerosol particles, collected with the particle-into-liquid sampler at SMEARII station in Finland in mid-August 2007, were analysed for biogenic acids. The sample pretreatment method, comprising solid-phase extraction with anion exchange and hydrophilic-lipophilic balance materials, was optimized. Extraction efficiencies of solid-phase extraction from 10 and 20ml samples were about 100%, with average relative standard deviation of 8.9%, in concentration range from 12.5 to 50ng/ml of the acid. Extraction of aldehydes was less successful, with efficiencies from 69 to 163% and average 10% deviation...
January 15, 2010: Talanta
Pingqing Fu, Kimitaka Kawamura, Jing Chen, Leonard A Barrie
Oxidation products of biogenic volatile organic compounds (BVOCs) (isoprene, monoterpenes, and sesquiterpene) were investigated in the Canadian High Arctic aerosols using gas chromatography-mass spectrometry. Twelve specific secondary organic aerosol (SOA) tracers and two hydroxyacids (glycolic and salicylic acids) were determined. The total concentrations of alpha-/beta-pinene oxidation products (e.g., pinic and 3-hydroxyglutaric acids, 138-5303 pg m(-3), average 1646 pg m(-3)) were much higher than those of isoprene oxidation products (e...
June 1, 2009: Environmental Science & Technology
I P S Kapoor, Bandana Singh, Gurdip Singh, Carola S De Heluani, M P De Lampasona, Cesar A N Catalan
Essential oil and oleoresins (ethanol and ethyl acetate) of Piper nigrum were extracted by using Clevenger and Soxhlet apparatus, respectively. GC-MS analysis of pepper essential oil showed the presence of 54 components representing about 96.6% of the total weight. beta-Caryophylline (29.9%) was found as the major component along with limonene (13.2%), beta-pinene (7.9%), sabinene (5.9%), and several other minor components. The major component of both ethanol and ethyl acetate oleoresins was found to contain piperine (63...
June 24, 2009: Journal of Agricultural and Food Chemistry
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