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Advanced Oxidation of Caffeine in Water: On-Line and Real-Time Monitoring by Electrospray Ionization Mass Spectrometry

“…Owing to outstanding sensitivity, speed, and selectivity, mass spectrometry (MS) has been used extensively to monitor the composition and degradation of organic compounds in the environment, but owing to the limitations of classical ionization techniques, MS monitoring has been commonly restricted to the more volatile and lighter components ( − ). Molecular analysis by MS has, however, profited greatly from the development of electrospray ionization (ESI) ( , ), which has enabled the ionization of most polar molecules and supramolecules ( , ).…”

Preparação do composto de associação entre citrato de ródio(II) e β-ciclodextrina

“…18,19 Este tipo de estrutura proporciona uma cavidade hidrofóbica, o que permite incluir as mais variadas moléculas em solução e/ou em fase sólida. [18][19][20][21][22][23][24][25] Quando formam compostos de inclusão, podem modificar as propriedades físico-químicas e biológicas de moléculas hóspedes. 15,[18][19][20][21][22][23][24][25]…”

Membrane introduction mass spectrometry applied to the monitoring of chloroform degradation by hypochloride in acidic aqueous medium

“…[7][8][9][10][11][12][13] In this technique volatile and semivolatile organic compounds permeate hydrophobic membranes, usually polydimethylsiloxanes (PDMS), preferentially to water and other polar substances. [14][15][16] MIMS can be applied to real-time and in-situ monitoring 14,[16][17][18] of chemical processes, such as: (a) conversion of chlorine to chloramines, an environmentally relevant reaction; [19][20][21] (b) chlorination of phenol and related compounds, models of humic substances, by sodium hypochloride; 22 (c) oxidation of benzene derivatives by Fenton's reagent; 23 (d) photolysis of aryl methyl ester in aqueous and aqueous-methanolic solutions; 24 (e) hydrolysis of epichlorohydrin, a significant compound in the polymer industry; 25 (f) catalytic hydrodechlorination of aromatic chlorides, an important process to treat organochloro compounds. 26 Chloroform is a suspected bladder, rectum and liver carcinogen agent in humans.…”