for the first time, a multi-residue methodfor simultaneous determination of 41lc-amenable pesticides in rice, belonging to different chemical classes has been developed in iran by lc-ms/ms. the pesticides were analyzed simultaneously in a single run using positive electrospray ionization with multiple reaction monitoring (mrm) after extraction with slightly modified quechers method. the calibra...

a rapid and reproducible method is described that employs solid phase extraction (spe) using dichloromethane, followed by gas chromatograph-mass spectrometry for the determination of toxic toluene, xylene and cumene (txc) from different lake water of dhaka mega city of bangladesh. the method was applied to detect and quantify txc in water samples collected from surface and 30 cm depth of water....

background and purpose: multiple sclerosis (ms) is a chronic disease that gives rise to a number of unpleasant symptoms that can be difficult to manage by conventional means. there are some aspects of ms-related disability which can be improved by using deep brain stimulation (dbs); particularly movement disorders, such as tremor. the research aim is to study the effect of dbs on ms tremor with...

weichang’an (wca) pill, a traditional chinese patent medicine consisting of ten chinese medicinal herbs, has been used to treat irritable bowel syndrome and functional dyspepsia for several decades. in this study, twelve bioactive constituents in the methanol extract of wca were accurately identified since ms/ms fragmentation behavior of the references and the standards by using hplc-dad-esi-ms...

There are well over 500 registered pesticides worldwide for use in agricultural regions and new agrochemicals are introduced to the marketplace continuously. This chapter deals with the chemical analysis methods for the main pesticide chemical classes that are most frequently analyzed with gas chromatography (GC) or liquid chromatography (LC) coupled to mass spectrometry (MS). GC amenable pesti...

the root of ophiopogon japonicus has been used as a traditional chinese medicine and also a functional food ingredient for a long time in china. in the present study, 17 different homoisoflavonoid compounds were identified in the root extract of o. japonicus by hplc–dad and lcms/ms analyses. the antioxidant activity of the of chloroform/methanol (1:1, v/v), methanol and 70% ethanol extracts, an...