Utilizing chemical derivatization (CD) to improve gas chromatographic (GC) and GC-mass spectrometric (MS) analysis of drugs has been abundantly studied and widely practiced, while in liquid chromatography (LC) and LC-MS, application of CD approaches is still at an early stage. Silylation, acylation, and alkylation are common CD reactions, long adopted by GC and GC-MS (including GC-MS/MS) method...

Thousands of organohalogen compounds, including hazardous chemicals such as polychlorinated biphenyls (PCBs) and other persistent organic pollutants (POPs), were selectively and simultaneously detected and identified with simple, or no, purification from environmental sample extracts by using several advanced methods. The methods used were software extraction from two-dimensional gas chromatogr...

medicinal plante borazambol with the scientific name of perovskia abrotanoides karel. belongs to the family lamiaceae. it is growing wild in the margin of mountainous roads of arid and cold climate of north iran. it is for a long time that indigenous people by different methods in traditional medicine use its products in preventing and curing diseases. in this research, essential oils of perovs...

a gas chromatography mass spectrometry with spike calibration curve method was used to quantify three carbamate pesticides residue in cooked white rice and to estimate the reduction percentage of the cooking process duration. the selected pesticides are three carbamate pesticides including carbaryl and pirimicarb that their mrl is issued by “the institute of standards of iran” and propoxur whic...

the essential oils of peucedanum ruthenicum m. bieb. (umbelliferae) leaves, flowers and fruits were prepared by hydrodistillation and analyzed by gc and gc-ms and the composition of the three essential oils were compared. thirty-three, thirty-seven and thirty-one compounds were identified in leaves, flowers and fruits essential oils representing 89.13%, 88.66% and 76.45% of total oils respectiv...

background & aim: salvia spinosa l. is a perennial shrub and aromatic plant belongs to the family lamiaceae. s. spinosa grows wild in some districts of iran. the aim of this study was to identify of the chemical components of s. spinosa in isfahan climatic conditions. experimental: the aerial parts of the plants were collected from isfahan province in 2014. the essential oil was extracted ...