Intermolecular Double-Quantum Coherence NMR Spectroscopy of Fruits Under Inhomogeneous Field

Abstract

Nuclear magnetic resonance (NMR) spectroscopy is an effective way to obtain in situ chemical information in biological tissues, and used in various application fields, including biology, food and medicine. It is often desirable to acquire high-resolution spectra of obtain more information of the sample, such as J-couplings, split structure and etc. However, acquiring high-resolution spectra under inhomogeneous field can be challenging. It has been shown previously that intermolecular double-quantum coherence (iDQC) derived from remote dipole-dipole interactions are insensitive to magnetic field inhomogeneity, and can be utilized to obtain high-resolution spectra under inhomogeneous fields. In this work, the IDEAL-II sequence was used to detect iDQC in butyl methacrylate, tomato and watermelon under inhomogeneous fields to obtain high-resolution spectra of these samples. The results demonstrated that the iDQC technology may provide a valuable tool in food science research.

Keywords

• nuclear magnetic resonance (nmr)
• inter-molecular double-quantum coherences (idqc)
• fruit detection
• inhomogeneous magnetic field