SEPARATION AND PURIFICATION OF TWO MINOR COMPOUNDS FROM RADIX ISATIDIS BY INTEGRATIVE MPLC AND HSCCC WITH PREPARATIVE...

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Pharmacognosy

Background:

• Radix isatidis is a traditional Chinese medicine known for antiviral and anticancer properties.
• Minor components within Radix isatidis may be responsible for its therapeutic effects.
• Efficient isolation of these minor compounds is crucial for pharmaceutical research.

Purpose of the Study:

• To develop an effective and rapid method for separating and purifying two specific minor compounds from Radix isatidis.
• To obtain high-purity indole-3-acetonitrile-6-O-β-D-glucopyranoside and clemastanin B.
• To facilitate further investigation into the pharmaceutical activities of these isolated compounds.

Main Methods:

• Integrative use of extraction, medium-pressure liquid chromatography (MPLC), high-speed countercurrent chromatography (HSCCC), and preparative high-performance liquid chromatography (pre-HPLC).
• Initial extraction of Radix isatidis using 50% methanol, followed by macroporous resin pretreatment and MPLC.
• Sequential purification using HSCCC for compounds not retained by MPLC, and pre-HPLC for final refinement.

Main Results:

• Successful separation and purification of indole-3-acetonitrile-6-O-β-D-glucopyranoside and clemastanin B.
• Achieved purity levels of 70-80% after MPLC, 80-90% after HSCCC, and 98-99% after pre-HPLC.
• Identified the chemical structures using Infrared (IR), Electrospray Ionization Mass Spectrometry (ESI-MS), and proton Nuclear Magnetic Resonance (¹H NMR).

Conclusions:

• An integrated chromatographic approach enables efficient and rapid isolation of target minor compounds from Radix isatidis.
• The developed method overcomes challenges like irreversible adsorption encountered with standard techniques.
• The high-purity isolated compounds are suitable for further pharmacological evaluation and potential drug development.