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Comparative Study of Chaga (Inonotus obliquus) Dietary Supplements Using Complementary Analytical Techniques
Coleton Windsor1, Anna E Kreynes1, Jeff S Chilton1
1North American Reishi, Ltd. D.ba Nammex, Box 1780, Gibsons, BC V0N 1V0, Canada.
International Journal of Molecular Sciences
|April 17, 2025
Summary
This study developed analytical methods to distinguish genuine Chaga (Inonotus obliquus) from fermented grain products in supplements. This ensures product authenticity and quality control for consumers.
Area of Science:
- Mycology
- Analytical Chemistry
- Pharmacognosy
Background:
- Chaga (Inonotus obliquus) is a popular supplement ingredient, but quality control is challenging due to inconsistent analytical methods.
- Concerns exist regarding product authenticity, mislabeling, and quality of Chaga supplements, especially those with fermented mycelia and grain.
- Lack of standardized methods hinders reliable identification of genuine Chaga canker versus adulterated products.
Purpose of the Study:
- To develop and validate a multi-analytical framework for differentiating wildcrafted Chaga canker from Chaga dietary supplements containing fermented grain products.
- To identify key chemical markers for distinguishing authentic Chaga from mycelial fermentation products.
- To ensure consumer safety and market integrity in the functional mushroom and Chaga supplement industries.
Main Methods:
- Employed a combination of High-Performance Thin-Layer Chromatography (HPTLC), Liquid Chromatography (LC) with various detectors (ELSD, PDA/DAD), Liquid Chromatography-Quadrupole Time-of-Flight Mass Spectrometry (LC-QToF-MS), Nuclear Magnetic Resonance (NMR) spectroscopy, UV-Vis spectrophotometry, and iodine-starch assays.
- Analyzed key markers including triterpenoids, polysaccharides, and melanin.
- Utilized NMR fingerprinting and LC-QToF-MS metabolomics for comprehensive compositional analysis.
Main Results:
- Whole Chaga canker contained specific triterpenoids (inotodiol, trametenolic acid) and phenolics (osmundacetone), absent in fermented grains.
- Melanin absorbance at 500 nm and absence of starch (confirmed by iodine-starch assay and β-glucan quantification) effectively distinguished Chaga canker from fermented grain products.
- NMR and LC-QToF-MS analyses revealed significant compositional differences between wildcrafted Chaga canker, Inonotus obliquus mycelium, and fermented grain products.
Conclusions:
- The integrated multi-analytical approach provides a reliable framework for distinguishing genuine Chaga canker from misrepresented products in the dietary supplement market.
- This methodology enhances quality control, ensures product authenticity, and protects consumers.
- The findings support trust and transparency in the markets for functional mushrooms, Chaga, and mycelium-based products.
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