Mass Spectrometric Identification of Metabolites after Magnetic-Pulse Treatment of Infected Pyrus communis L. Microplants

Abstract

The major goal of this study is to create a venue for further work on the effect of pulsed magnetic fields on plant metabolism. It deals with metabolite synthesis in the aforementioned conditions in microplants of Pyrus communis L. So far, there have been glimpses into the governing factors of plant biochemistry in vivo, and low-frequency pulsed magnestatic fields have been shown to induce additional electric currents in plant tissues, thus perturbing the value of cell membrane potential and causing the biosynthesis of new metabolites. In this study, sixty-seven metabolites synthesized in microplants within 3–72 h after treatment were identified and annotated. In total, thirty-one metabolites were produced. Magnetic-pulse treatment caused an 8.75-fold increase in the concentration of chlorogenic acid (RT = 8.33 ± 0.0197 min) in tissues and the perturbation of phenolic composition. Aucubin, which has antiviral and antistress biological activity, was identified as well. This study sheds light on the effect of magnetic fields on the biochemistry of low-molecular-weight metabolites of pear plants in vitro, thus providing in-depth metabolite analysis under optimized synthetic conditions. This study utilized high-resolution gas chromatography-mass spectrometry, metabolomics methods, stochastic dynamics mass spectrometry, quantum chemistry, and chemometrics, respectively. Stochastic dynamics uses the relationships between measurands and molecular structures of silylated carbohydrates, showing virtually identical mass spectra and comparable chemometrics parameters.

Stochastic dynamics mass spectrometric determination of ferrocenes

“…Despite, the fact, that equation (6) does not account for fluctuations of measurable variables, which are generally unable to be predicted theoretically, its few applications to determine metabolites, so far, show excellent method performances |r|=0.99922-0.99 [56]. Conversely, the reported, so far, applications of the basic equation (2) to determine quantitatively and structurally LMWs chiefly yield to exact method performances (|r|=1), including determining analytes in biological fluids and environmental samples [11,51].…”

“…Despite, that the capability of equation ( 2) has been highlighted on few studies dealing with MS analysis of coordination compounds of transition metal ions; thus showing |r|=0.99448-0.99091 [57]. The reliability of data on equation (6) have been highlighted, so far, examining silicon organometallics; thus producing the shown above performances [56]. Its application to organics has resulted in |r|=0.99659 examining oligopeptides of SILAC-based proteomics [52], while the employment in formula (2) to determine the same analytes, but accounting for fluctuations of measurands yields to |r|=0.99998.…”

“…It depends on type of ferrocene salt. For instance, CID-MS/MS data on protonated ferrocene- 56 Fe-boronate acid, it its most abundance peak [45]. The proposed hydride of ferrocene cation at m/z 187 (187_b) assumes presence of high-valent iron center of metalchromophore.…”

“…[ 56 Fe II (C5H5)2H] + cation (187_c), as well [68]. Doubly charged metallocene species, including ferrocene ones, can be observed experimentally depending on ionization MS conditions [67].…”

Stochastic dynamics mass spectrometric structural analysis of poly(methyl methacrylate)

“…In overcoming the problem there is developed innovative methodology for exact data-processing of MS measurands via model equations ( 1) and (2) [17][18][19][20][21][22][23][24][25]. They are applicable to quantitative and 3D structural analysis of molecules via mass spectrometry.…”