a reliable, rapid and accurate method based on spiked calibration curves and direct sample introduction was developed for determination of 17 pesticide residues in rice by gas chromatography-mass spectrometry single quadrupole selected ion monitoring gc/ms-sq-sim. sample preparation is based on extraction with acetonitrile without clean up. the use of spiked calibration curves for constructing ...

background & aim: peppermint (mentha piperita l.) oil is one of the most popular and widely used as an essential oil. the aim of this study was to identify of the chemical components of peppermint cultivated in isfahan climatic conditions. experimental: the aerial parts of the plants were collected from a filed in meymeh, isfahan province in 2012. the essential oil was extracted by a cleven...

background & aim: echinophora cinerea is a plant of the apiaceae family, which reaches to a height of 30 to 100 cm. the essential oil of echinophora cinerea contains alkaloids and flavonoids etc. phenolic composition is one of the best sources of natural antioxidants. the goal of this study is to examine the antibacterial and antioxidant activities of the essential oil of e. cinerea. experi...

The current study applied gas chromatography-mass spectrometry (GC–MS), liquid (LC-MS), and thermal desorption direct analysis in real-time mass (TD-DART-MS) methods to the of black pepper (Piper nigrum L.) samples from different countries. powder were analyzed directly by TD-DART-MS without any extraction, but for GC–MS LC-MS methods, a methanol extraction procedure was employed before analysi...