Analysis of sulphonated dyes and intermediates by electrospray mass spectrometry

EPR and LC-MS studies on the mechanism of industrial dye decolorization by versatile peroxidase from Bjerkandera adusta

“…5 Low temperature (70 K) X-band EPR spectra of the phthalocyanine dye Reactive Blue 72 before (a) and after (b) catalytic reaction with B. adusta VP, compared with the X-band EPR spectrum of a Cu(ClO 4 ) 2 solution in phthalate buffer (c). EPR spectra have been recorded at ν= 9.37 GHz, using a 0.5 mT modulation amplitude, 6.3 mW microwave power Sulfonated compounds form molecular ions with different charges either by subsequent loss of protons to form adducts with sodium ions are common in the negative-ion electrospray mass spectrometry (Holcapek et al 1999). The presence of this compound confirms the oxidative cleavage of the azo bond.…”

Umweltanalytik mit Ionenchromatografie: Status quo und Zukunftsperspektiven

“…Der umweltanalytische Nachweis von Azoverbindungen beschränkt sich auf industrielle Abwässer (Storm 2002;Storm et al 1999;Stüber 2005). Dagegen liegen etliche Arbeiten zum Abbau von Azofarbstoffen während der biologischen und chemisch-physikalischen Behandlung von Rohabwässern oder Testgemischen im Labor-, Pilot-und technischen Maßstab vor (Holčapek et al 1999(Holčapek et al , 2001Vanĕrková et al 2006;Sakalis et al 2004), wobei die IPC auch beim Prozessmonitoring von biotechnischen Abwasserreaktoren Einsatz fand (Rehorek et al 2002;Plum et al 2003;Plum und Rehorek 2005;Rehorek und Plum 2006). Die grundlegenden analytischen Verfahrensdaten sind in Tab.…”

Electrochemical Behavior of Acid Orange 7 by Cyclic Voltammetry in Different Solvents

“…There are other methods for the quantitative detection and characterization of azo dyes, including electronic spectroscopy [11], infrared spectroscopy [12][13][14], mass spectroscopy [15,16], gas chromatography/mass spectroscopy, high-performance liquid chromatography (HPLC) with UV-Vis and mass detectors [17][18][19][20][21][22][23]. It is well known that electrochemical methods are the most widely used in direct determination of chemical molecules, as they are not only rapid and sensitive, but also more feasible for microanalysis.…”