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DNA identification of commercial ginseng samples
J J Mihalov1, A D Marderosian, J C Pierce
1Department of Biological Sciences and Department of Chemistry and Biochemistry, University of the Sciences in Philadelphia, PA 19104-4495, USA.
Journal of Agricultural and Food Chemistry
|August 24, 2000
Summary
A new DNA-based protocol accurately identifies commercial ginseng (Panax ginseng and Panax quinquefolius) by analyzing DNA sequences. This method offers a reliable alternative to traditional botanical and biochemical identification techniques for the herbal compound.
Area of Science:
- Botany
- Genetics
- Pharmacognosy
Background:
- Ginseng products are widely used, with an estimated $300 million annual market in the US.
- Current identification methods rely on botanical expertise or biochemical analysis (e.g., ginsenosides).
- Accurate species identification is crucial for quality control and consumer safety.
Purpose of the Study:
- To develop and validate a DNA-based protocol for identifying commercial ginseng samples.
- To assess the feasibility of using DNA sequencing and fingerprinting for species differentiation.
- To improve DNA isolation methods for commercial ginseng preparations.
Main Methods:
- DNA sequence analysis of the nuclear ribosomal internal transcribed spacer region.
- Sequence analysis of the chloroplast ribulose 1,5-bisphosphate carboxylase large subunit gene.
- DNA fingerprinting using the rapid amplification of polymorphic DNA (RAPD) technique.
- Confirmation of results using high-performance liquid chromatography (HPLC).
Main Results:
- All developed DNA-based methods successfully distinguished between American ginseng (Panax quinquefolius) and Korean/Chinese ginseng (Panax ginseng).
- The protocol was optimized for DNA isolation from commercial ginseng products, including an impact homogenization step.
- The DNA-based approach proved effective for species identification.
Conclusions:
- DNA analysis provides a robust and accurate method for identifying commercial ginseng species.
- The developed protocol offers a valuable tool for ensuring the authenticity of ginseng products.
- This genetic approach complements traditional identification methods, enhancing quality assurance in the herbal products market.
