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Raman Spectroscopic Authentication of Rebaudioside M: Discriminating Natural, Fermentation-Derived, and Enzymatically
Giuseppe Pezzotti1,2,3,4,5,6,7, Akihiro Miyamoto8, Takashi Yamashita1,9
1Biomedical Engineering Center, Kansai Medical University, 1-9-11 Shin-Machi, Hirakata 573-1191, Japan.
Foods (Basel, Switzerland)
|June 12, 2026
Summary
Raman spectroscopy quickly distinguishes Rebaudioside M (Reb M) from different sources like leaves, fermentation, or enzymes. This non-destructive method ensures sweetener quality and safety, offering a low-cost alternative to traditional analysis.
Area of Science:
- Food Science
- Analytical Chemistry
- Biotechnology
Background:
- Rebaudioside M (Reb M) is a sought-after steviol glycoside sweetener known for its superior taste profile.
- Low natural abundance of Reb M in Stevia leaves necessitates alternative production methods like fermentation and enzymatic bioconversion.
- Accurate authentication of Reb M sources is crucial for quality control and consumer safety.
Purpose of the Study:
- To evaluate Raman spectroscopy as a rapid, non-destructive method for discriminating Reb M from various production origins.
- To identify unique spectral fingerprints corresponding to different Reb M sources.
- To demonstrate the potential of Raman spectroscopy for real-time quality control of next-generation stevia sweeteners.
Main Methods:
- Utilized Raman spectroscopy to analyze Reb M samples from three distinct sources: natural leaf extracts, microbial fermentation, and enzymatic bioconversion.
- Compared spectral data to identify characteristic vibrational fingerprints for each production method.
- Assessed the technique's ability to detect differences in glycosylation, residual compounds, and byproducts.
Main Results:
- Distinct Raman spectra were observed for Reb M from each source, reflecting variations in chemical composition and structure.
- The identified spectral fingerprints allowed for clear discrimination between naturally occurring, fermented, and enzymatically produced Reb M.
- Raman spectroscopy proved effective in identifying process-related byproducts and matrix components.
Conclusions:
- Raman spectroscopy is a powerful tool for rapid and label-free authentication of Rebaudioside M origin.
- The technique offers a cost-effective and efficient alternative to conventional chromatographic methods for quality control.
- This approach enhances transparency, safety, and consistency in the production of advanced stevia sweeteners.
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