Jul 02, 2023
Molecular Structure Analysis of Organic Compounds used in Agricultural and Food Chemistry
Structure analysis of agrochemical molecule with XtaLAB Synergy-ED, JEOL MS and NMR
Diflubenzuron is an insecticide, approved by the WHO Pesticide Evaluation Scheme. It is widely used in forest Management and agriculture. The EPA issued a Registration Standard for diflubenzuron in September 1985 (PB86-176500). Currently, 29 diflubenzuron products are registered. XtaLAB Synergy-ED allows electron diffraction structure analysis of submicron particles of laboratory chemicals. Moreover, the comprehensive analysis by using JEOL’s mass spectrometer (MS) and nuclear magnetic resonance (NMR) spectrometer provides details of chemical structure information for molecular structure determination.
Chemical structure analysis of Diflubenzuron
For elucidating the molecular structure of Diflubenzuron, the molecular formula is determined by using MS. In the example, the molecular formula of Diflubenzuron is provided from the mass spectrum by using JMS-S3000 SpiralTOF™-plus 2.0 (shown top left). In addition, NMR analysis provides the details of Diflubenzuron chemical structure (shown bottom left). 1H-13C, 1H-15N and 1H-19F connectivity information is available for partial structure analysis of Diflubenzuron. ROYALPROBE™ HFX enables a wide variety of advanced 1H and 19F NMR experiments with dual tune mode. It is effective to simplify spectral assignments with 1H with 19F decoupling, 19F with 1H decoupling, 13C with 1H and 19F decoupling and many unique correlation experiments for the analysis of organic compounds that contain fluorine atoms, for example Diflubenzuron.
Structure refinement of Diflubenzuron
XtaLAB Synergy-ED allows single crystal analysis of Diflubenzuron with submicron particles. Diflubenzuron contains hydrogen, carbon, nitrogen, oxygen and chlorine. The molecular structure model is estimated by the electrostatic potential obtained through electron diffraction analysis. An initial structural model is refined with the result of MS and NMR analysis. The Diflubenzuron chemical structural model obtained by MS and NMR analysis provides details of the partial structure to elucidate the molecular model correctly. In the example below, the right diagram is the resulting structure of Diflubenzuron which is refined by the chemical structure model of the MS and NMR results.
Structure analysis of Riboflavin
Various plants contain Riboflavin which causes no risk to human health, therefore it is excluded from pesticide residue analysis. The structure analysis workflow of Diflubenzuron is available for Riboflavin. In the following example, the workflow is applied to Riboflavin. The right figure is the result of the refined structure of Riboflavin. This structure refinement is confirmed by the result of MS and NMR analysis. The NMR analysis provides details of the partial structure, 1H-13C and 1H-15N connectivity information to properly elucidate the molecular model.
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