[Comparative study on HPLC fingerprints between crude and processed Ligustri Lucidi Fructus]

Area of Science:

• Pharmacognosy
• Analytical Chemistry
• Traditional Chinese Medicine

Background:

• Ligustri Lucidi Fructus is a traditional Chinese medicine with therapeutic applications.
• Standardized quality control methods are essential for ensuring the efficacy and safety of herbal medicines.
• Establishing reliable analytical fingerprints is crucial for differentiating raw and processed herbal materials.

Purpose of the Study:

• To develop and validate High-Performance Liquid Chromatography (HPLC) fingerprints for crude and processed Ligustri Lucidi Fructus.
• To evaluate the quality and differentiate between crude and processed forms using similarity calculations and chemical pattern recognition.
• To identify key marker compounds responsible for variations between crude and processed Ligustri Lucidi Fructus.

Main Methods:

• High-Performance Liquid Chromatography (HPLC) with a Syncronis C18 column and gradient elution using acetonitrile and phosphoric acid.
• Detection at 280 nm for 22 batches of crude and processed Ligustri Lucidi Fructus.
• Similarity evaluation using the Similarity Evaluation System for Chromatographic Fingerprint of Traditional Chinese Medicine (2012 Edition).
• Chemical pattern recognition employing Cluster Analysis (CA), Principal Component Analysis (PCA), and Partial Least Squares Discriminant Analysis (PLS-DA).

Main Results:

• Stable and reliable HPLC fingerprints were successfully established for both crude and processed Ligustri Lucidi Fructus.
• High similarity (0.9 to 1.0) was observed within the established fingerprints.
• Cluster Analysis (CA), Principal Component Analysis (PCA), and Partial Least Squares Discriminant Analysis (PLS-DA) effectively distinguished between crude and processed samples.
• Eleven key constituents, including hydroxytyrosol, tyrosol, specnuezhenide, and oleuropein, were identified as major marker components differentiating the samples.

Conclusions:

• The developed HPLC fingerprinting method is robust and suitable for the quality control of crude and processed Ligustri Lucidi Fructus.
• Chemical pattern recognition techniques (CA, PCA, PLS-DA) provide a powerful tool for comprehensive quality evaluation of Ligustri Lucidi Fructus.
• The study successfully identified marker compounds that can aid in quality assessment and process validation.