نتایج جستجو برای: microextraction

تعداد نتایج: 3012  

Journal: :Journal of agricultural and food chemistry 2006
John C Beaulieu Jeanne M Lea

Seedless triploid watermelons have increased in popularity since the early 1990s, and the demand for seedless fruit is on the rise. Sweetness and sugars are crucial breeding focuses for fruit quality. Volatiles also play an important role; yet, we found no literature for seedless varieties and no reports using solid-phase microextraction (SPME) in watermelon. The objective of this experiment wa...

2012
Renata Wietecha-Posłuszny Aneta Garbacik Michał Woźniakiewicz Agnieszka Moos Marcin Wieczorek Paweł Kościelniak

A method of microextraction by packed sorbent (MEPS) followed by liquid chromatography with diode array detection has been developed and optimized for the extraction of six tricyclic antidepressants (amitriptyline, nortriptyline, imipramine, desipramine, doxepin, nordoxepin) from human serum. The optimal parameters of MEPS extraction (type of sorbent, volume of sample, composition, and volume o...

Journal: :Analytical chemistry 2002
Limian Zhao Hian Kee Lee

Two modes of liquid-phase microextraction (LPME) combined with hollow fiber (HF) were developed for gas chromatography/mass spectrometry (GC/MS). Both methodologies, that is, static LPME with HF and dynamic LPME with HF, involved the use of a small volume of organic solvent impregnated in the hollow fiber, which was held by the needle of a conventional GC syringe. In static LPME/HF, the hollow ...

Journal: :international journal of occupational hygiene 0
abdulrahman bahrami excellence centre for occupational health, research centre for health sciences, school of public health, hamadan university of medical science, hamadan, iran. farshid ghorbani department of occupational health engineering, research centre for health sciences, school of public, health, hamadan university of medical science, hamadan, iran. hadi baiati department of occupational health engineering, research centre for health sciences, school of public, health, hamadan university of medical science, hamadan, iran. mohammadjavad zare-sakhvidi department of occupational health, faculty of health engineering, shahidsadoughi university of medical sciences,yazd, iran.

carbon disulfide is used predominantly in the manufacture. it has affects the nervous system. in this study, the applicability of spme as a passive sampler for determination of carbon disulphide in air was studied. effect of sampler and environmental parameters on uptake of carbon disulphide was studied as well. four fibers were tested to select the best sampler for determine carbon disulfide i...

Journal: :iranian journal of analytical chemistry 2015
zarrin es’haghi zohreh rezaeifar

this research is on the improvement of the procedure to determination of trace levels of antidepressant drug; fluoxetine in wastewaters. in this research a silica based sol-gel was applied for the extraction of fluoxetine from water samples. this two-phase technique is consisting of aqueous samples of fluoxetine (donor phase) and silica based nanocomposite prepared by sol-gel technique (accepto...

2012
Reza Ahmadkhaniha Nasrin Samadi Mona Salimi Parisa Sarkhail Noushin Rastkari

A reliable and sensitive headspace solid-phase microextraction gas chromatography-mass spectrometry method for simultaneous determination of different organophosphorus pesticides in dried medicinal plant samples is described. The analytes were extracted by single-walled carbon nanotubes as a new solid-phase microextraction adsorbent. The developed method showed good performance. For diazinon an...

Journal: :Journal of chromatography. A 2004
Petru Jitaru Freddy C Adams

This paper reports the development of an analytical approach for speciation analysis of mercury at ultra-trace levels on the basis of solid-phase microextraction and multicapillary gas chromatography hyphenated to inductively coupled plasma-time-of-flight mass spectrometry. Headspace solid-phase microextraction with a carboxen/polydimethylsyloxane fiber is used for extraction/preconcentration o...

Journal: :Analytica chimica acta 2009
Kuan-Pin Huang Guan-Ren Wang Bao-Yu Huang Chuen-Ying Liu

A simple and cost effective solid-phase microextraction device has been developed. Fused-silica capillaries were etched with ammonium hydrogen difluoride prior to coating with an ionic liquid. For comparison, both a bare fused-silica capillary and one pretreated with a Nafion membrane were coated with the ionic liquid. All three coated capillaries were employed for the head space microextractio...

Journal: :Analytical chemistry 2000
P Mayer W H Vaes J L Hermens

The use of solid-phase microextraction with poly(dimethylsiloxane) (PDMS)-coated glass fibers for the extraction and analysis of hydrophobic organic analytes is increasing. The literature on this topic is characterized by large discrepancies in partition coefficients and an uncertainty of whether highly hydrophobic analytes are retained by absorption into the fiber coating or by adsorption to t...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2013
Zeynab Khoshdel Payman Hashemi Mehdi Safdaryan Bahram Delfan Marzieh Rashidipour Alireza Badiei

A carbon-based nanoporous sorbent was first used for microextraction in a packed syringe (MEPS) before HPLC/UV analysis of some biophenols in rat plasma. A laboratory-made programmable apparatus was designed and used for automation of the extraction procedure. The MEPS syringe was packed with 2 mg of CMK-3 sorbent, between the barrel and the injection needle, and mounted on an apparatus for pro...

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