Pesticide analysis of fruits and vegetables requires finding trace-level residues in complex matrices. Up to now, the typical trade-off is between sensitivity and confirmation. Therefore, multiple injections are needed for screening and confirmation using gas chromatography with mass spectrometry (GC-MS) or GC-MS in combination with GC with element-selective detection. With the recent introduct...

Identification of unknown compounds is of critical importance in GC/MS applications (metabolomics, environmental toxin identification, sports doping, petroleomics, and biofuel analysis, among many others) and remains a technological challenge. Derivation of elemental composition is the first step to determining the identity of an unknown compound by MS, for which high accuracy mass and isotopom...

Copy toner samples were analyzed using scanning electron microscopy with X-ray dispersive analysis (SEM-EDX) and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). Principal component and cluster analysis of SEM data for 166 copy toner samples established 13 statistically different subgroups, with the presence or absence of a ferrite base being a major division. When toners were compare...

Pesticide residue analysis in medicinal herbs is a challenging task because of the matrix effect and its influence on quantitative despite continuous development several new analytical methods instrumentations. In this study, modified QuEChERS method was developed for indoxacarb by using conventional instrument, gas chromatography micro-electron-capture-detector (GC–μECD), comparing it with chr...

A range of different analytical techniques were used to test recycled polyethylene terephthalate (PET) flakes for potential chemical contaminants. The techniques used were headspace gas chromatography coupled to mass spectrometry (GC-MS), liquid extraction followed by GC-MS, supercritical-fluid extraction followed by GC-MS, and migration testing followed by elemental analysis using inductively ...

Abstract. Nursanty R, Padzil KNBM, Ramli NIB, Mahyudin NA, Jaafar AHB, Rukayadi Y. 2023. Phytochemical analysis of ethanolic Psidium guajava leaves extract using GC-MS and LC-MS. Biodiversitas 24: 2723-2732. L. is well known as guava has been used traditionally a medicinal plant for variety ailments all over the world, especially in infusions decoctions oral topical use. Every part this treatin...

Maleimides (1H-Pyrrole-2,5-diones) are monopyrrolic pigment derivatives with specific alkyl side chains that can be directly linked to their tetrapyrrole precursors, most notably chlorophylls and bacteriochlorophylls. These compounds can be used as palaeoenvironmental indicators such as algal productivity and redox conditions in ancient and modern aquatic systems. Here, we present a new method ...