Definition
Phellodendrine is a naturally occurring protoberberine alkaloid chemically characterized as 1,2,3,9-tetrahydro-2-methoxy-10-methyl-10H‑pyrido[2,1‑b][1,3]benzodioxolo[5,6‑c]pyridine. It is found principally in the bark of trees belonging to the genus Phellodendron.
Overview
Phellodendrine is isolated from the bark of Phellodendron amurense (Amur cork tree) and Phellodendron chinense, both members of the Rutaceae family. It belongs to the isoquinoline alkaloid class and shares structural similarity with berberine and other protoberberine alkaloids. In traditional East Asian medicine, extracts containing phellodendrine have been used for their purported anti‑inflammatory, antimicrobial, and antipyretic effects. Modern pharmacological investigations have examined its activity on the central nervous system, cardiovascular system, and its potential as an antioxidant, though comprehensive clinical data are limited.
Etymology / Origin
The name “phellodendrine” is derived from the botanical genus Phellodendron, itself formed from the Greek words “phḗllon” (meaning “cork”) and “déndron” (meaning “tree”), referring to the corky bark of these trees. The suffix “‑ine” is a standard chemical nomenclature ending for alkaloids.
Characteristics
| Property | Details |
|---|---|
| Chemical formula | C₂₀H₂₂NO₄ |
| Molecular weight | Approximately 338.4 g·mol⁻¹ |
| Physical state | Yellowish‑brown crystalline solid (often obtained as a powder) |
| Solubility | Sparingly soluble in water; soluble in organic solvents such as ethanol, methanol, and chloroform |
| Melting point | Reported in the range of 188–191 °C |
| Pharmacology | In vitro studies indicate modest inhibition of acetylcholinesterase, weak antimicrobial activity against Gram‑positive bacteria, and vasodilatory effects mediated by calcium channel modulation. Antioxidant activity has been observed in cell‑free assays. |
| Toxicology | Acute toxicity data are limited; animal studies report low toxicity at doses up to 200 mg kg⁻¹ body weight, but comprehensive safety evaluations for human use are not established. |
| Metabolism | Preliminary metabolic profiling suggests hepatic Phase I oxidation (hydroxylation) and Phase II conjugation (glucuronidation), similar to other isoquinoline alkaloids. |
Related Topics
- Berberine – a structurally related protoberberine alkaloid with well‑documented pharmacological properties.
- Phellodendron – the genus of trees whose bark is the primary source of phellodendrine.
- Isoquinoline Alkaloids – a broad class of plant‑derived nitrogenous compounds that includes phellodendrine.
- Traditional Chinese Medicine (TCM) – phellodendrine‑containing preparations, such as Huang Bai (cortex phellodendri), are used in TCM formulations.
- Pharmacognosy – the study of bioactive compounds derived from natural sources, encompassing the extraction and characterization of phellodendrine.
Note: While preclinical studies provide insight into the biological activities of phellodendrine, definitive clinical evidence regarding its efficacy and safety in humans remains limited.