LC-MS-based quantification method for Achyranthes root saponins

Area of Science:

• Phytochemistry
• Analytical Chemistry
• Pharmacognosy

Background:

• Achyranthes root is a traditional medicine with diverse saponin constituents.
• Understanding saponin profiles is crucial for quality control and therapeutic efficacy.
• Previous analytical methods may not offer simultaneous quantification of key saponins.

Purpose of the Study:

• To develop and validate a liquid chromatography-mass spectrometry (LC-MS) method for simultaneous quantitative analysis of eleven Achyranthes root saponins.
• To investigate the impact of different extraction conditions on the saponin composition of Achyranthes root.
• To establish a reliable method for the quality control of Achyranthes root.

Main Methods:

• Simultaneous quantitative analysis using liquid chromatography-mass spectrometry (LC-MS).
• Separation achieved using a phenyl-hexylated silica gel column with dihexyl ammonium acetate as a volatile ion-pair reagent.
• Extraction efficiency evaluated under three distinct conditions: room temperature water extraction, standard decoction, and prolonged heating.

Main Results:

• The developed LC-MS method successfully separated and quantified eleven target saponins, including chikusetsusaponins, achyranthosides, sulfachyranthosides, and betavulgarosides.
• Room temperature water extraction yielded achyranthosides B and D as major components, with negligible chikusetsusaponins.
• Standard decoction conditions favored achyranthosides B, C, and D, while prolonged heating significantly increased chikusetsusaponin levels.

Conclusions:

• The developed LC-MS method provides a robust tool for the simultaneous quantification of multiple Achyranthes root saponins.
• Extraction conditions critically influence the relative abundance of different saponin classes.
• This method is suitable for ensuring the quality control of Achyranthes root and its derived products.