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CEST effect of dimethyl sulfoxide at negative offset frequency.

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This summary is machine-generated.

Dimethyl sulfoxide (DMSO) and similar solvents generate unique chemical exchange saturation transfer (CEST) signals. This novel CEST detection method allows for label-free imaging of drug nanocarriers and solvent-drug interactions.

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Area of Science:

  • Biomedical applications
  • Magnetic Resonance Imaging
  • Chemical Exchange Saturation Transfer (CEST)

Background:

  • Dimethyl sulfoxide (DMSO) is widely used in biomedical applications, including as a cryoprotectant and drug carrier.
  • Current methods for monitoring drug delivery systems can be limited.

Purpose of the Study:

  • To investigate the potential of DMSO to generate a detectable chemical exchange saturation transfer (CEST) signal.
  • To explore the application of DMSO-CEST for imaging drug nanocarriers.

Main Methods:

  • DMSO and its structural analogs were analyzed for CEST signal generation.
  • CEST-detectable barbituric acid (BA) was dissolved in DMSO and loaded into liposomes for imaging.
  • Analysis of molecular interactions and magnetization transfer pathways, including relayed nuclear Overhauser enhancement (rNOE).

Main Results:

  • DMSO was found to generate a distinct CEST signal at approximately -2 ppm.
  • Structural analogs of DMSO also exhibited CEST signals across a range of negative offset frequencies (-1.4 to -3.8 ppm).
  • Co-loading of DMSO and barbituric acid into liposomes resulted in observable CEST peaks, enabling label-free monitoring.

Conclusions:

  • Organic solvents like DMSO can be detected using CEST MRI through interactions with water.
  • This provides a novel, label-free approach for imaging drug nanocarriers and studying solvent-drug interactions.
  • The findings open new avenues for CEST applications in biomedical imaging and drug delivery research.