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Applications of Liquid-Chromatography Tandem Mass Spectrometry in Natural Products Research: Tropane Alkaloids as a Case Study
Published on: March 8, 2024
Bioactive isoquinoline alkaloids from Corydalis saxicola
Qiao-Qin Huang1, Jun-Long Bi, Qian-Yun Sun
1Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, People's Republic of China.
Planta Medica
|August 23, 2011
Summary
Two new nitro-containing tetrahydroprotoberberines were isolated from Corydalis saxicola Bunting. These compounds, along with others, showed potent inhibition against acetylcholinesterase, with nitro groups enhancing activity.
Area of Science:
- Natural Product Chemistry
- Pharmacology
- Medicinal Chemistry
Background:
- Isoquinoline alkaloids are a diverse class of natural products with a wide range of biological activities.
- Corydalis species are known sources of pharmacologically active alkaloids.
- Cholinesterase inhibition is a key target for treating Alzheimer's disease and other neurological disorders.
Purpose of the Study:
- To isolate and characterize new nitro-containing tetrahydroprotoberberines from Corydalis saxicola Bunting.
- To evaluate the inhibitory activity of isolated compounds against cholinesterase and canine parvovirus.
- To investigate the structure-activity relationships, particularly the role of nitro substituents.
Main Methods:
- Isolation of alkaloids using chromatographic techniques.
- Structure elucidation using spectroscopic methods (NMR, MS) and chemical evidence.
- In vitro assays to determine inhibitory activity against acetylcholinesterase and canine parvovirus.
Main Results:
- Two new nitro-containing tetrahydroprotoberberines, (-)-2,9-dihydroxyl-3,11-dimethoxy-1,10-dinitrotetrahydroprotoberberine and (+)-4-nitroisoapocavidine, were identified.
- Several isolated compounds, including the new ones, exhibited potent acetylcholinesterase inhibitory activity (IC(50) < 10 µM).
- Compound 1 showed weak activity against canine parvovirus; nitro substituents on ring A enhanced anti-acetylcholinesterase activity.
Conclusions:
- Corydalis saxicola Bunting is a source of novel nitro-containing tetrahydroprotoberberines.
- The isolated alkaloids possess significant potential as acetylcholinesterase inhibitors.
- Nitro substitution in tetrahydroprotoberberines is a promising strategy for developing more potent anti-acetylcholinesterase agents.
