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Mechanistic Study of L-Rhamnose Monohydrate Dehydration Using Terahertz Spectroscopy and Density Functional Theory
Bingxin Yan1,2,3, Zeyu Hou1,2,3, Yuhan Zhao1,2,3
1Department of Physics, Capital Normal University, Beijing 100048, China.
Molecules (Basel, Switzerland)
|March 13, 2025
Summary
Terahertz time-domain spectroscopy (THz-TDS) effectively monitors L-rhamnose monohydrate dehydration. This method reveals structural changes crucial for developing L-rhamnose as a vaccine adjuvant.
Area of Science:
- Carbohydrate chemistry
- Spectroscopy
- Vaccine adjuvant development
Background:
- L-rhamnose shows promise for enhancing vaccine antigenicity.
- Understanding L-rhamnose monohydrate dehydration is key to optimizing its use as a vaccine adjuvant.
- Physicochemical properties are significantly altered by dehydration.
Purpose of the Study:
- To investigate the dehydration behavior of L-rhamnose monohydrate.
- To characterize spectroscopic features using terahertz time-domain spectroscopy (THz-TDS), Raman spectroscopy, and powder X-ray diffraction (PXRD).
- To establish a method for analyzing carbohydrate hydrates and their dehydration processes.
Main Methods:
- Terahertz time-domain spectroscopy (THz-TDS) for spectral analysis.
- Raman spectroscopy and powder X-ray diffraction (PXRD) for complementary data.
- Density functional theory (DFT) calculations to interpret spectral data.
Main Results:
- THz-TDS effectively distinguishes L-rhamnose from its monohydrate and tracks structural changes during dehydration.
- Dehydration of L-rhamnose monohydrate completes within 6 minutes at 100 °C.
- DFT calculations confirmed water molecule vibrations influence THz absorption peaks, indicating significant structural changes upon dehydration.
Conclusions:
- THz-TDS combined with DFT calculations provides an accurate method for studying carbohydrate hydrates and their dehydration.
- This approach is valuable for understanding molecular interactions in hydrated systems.
- Findings support the development of L-rhamnose as an effective vaccine adjuvant.
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