Chemical Identity and Structure

Rubiadin-1-methyl ether is a naturally derived anthraquinone compound. Anthraquinones are a well-established class of polycyclic aromatic molecules featuring a tricyclic ring system with two ketone groups at positions 9 and 10. Rubiadin-1-methyl ether is the methoxy-substituted form of rubiadin (3-hydroxy-1-methylanthraquinone), in which the hydroxyl group at position 1 is replaced by a methoxy (-OCH₃) group, yielding 1-methoxy-3-hydroxy-2-methylanthraquinone as the core structural motif.

This substitution pattern is characteristic of secondary metabolites found in the Rubiaceae plant family. The presence of both hydroxyl and methoxy substituents on the anthraquinone scaffold contributes to its polarity profile, UV absorbance characteristics, and proposed mechanisms of biological interaction, including redox activity and protein binding.

Note: Precise physicochemical data (molecular weight, melting point, LogP, exact CAS number) should be confirmed against the current product specification sheet and certificate of analysis (CoA) available from Aladdin Scientific for SKU R650736.

Reported Biological Activities and Research Applications

Rubiadin-1-methyl ether has been investigated in the context of several pharmacological research areas. As with many anthraquinone natural products, its reported activities include:

• Anti-inflammatory activity: Anthraquinone derivatives from Rubia species have been studied for their ability to modulate inflammatory pathways. Rubiadin-1-methyl ether has been explored in assays targeting relevant inflammatory mediators.
• Antioxidant properties: The hydroxyl and methoxy substituents on the aromatic ring system may confer free-radical scavenging capacity, a common feature of polyhydroxylated anthraquinones.
• Cytotoxic and anticancer potential: Several anthraquinone derivatives exhibit cytotoxicity against cancer cell lines in vitro. Research investigations using Rubiadin-1-methyl ether in cell viability and proliferation assays have been reported.
• Hepatoprotective effects: Plant-derived anthraquinones from Rubiaceae members have been examined for liver-protective properties in experimental models.

Rubiadin-1-methyl ether (R650736) is intended for research use only and is not approved for human therapeutic, diagnostic, or veterinary use. All biological activity data cited in the literature should be independently verified by the investigator.

Solubility, Formulation, and Handling Guidelines

Proper formulation of Rubiadin-1-methyl ether is essential for reproducible in vitro assay results. As an anthraquinone derivative with both hydrophobic aromatic rings and polar substituents, the compound is generally expected to have limited aqueous solubility. Common formulation strategies include:

• DMSO stock solutions: Dimethyl sulfoxide (DMSO) is the most widely used solvent for dissolving anthraquinone derivatives for cell-based assays. Prepare a concentrated stock (e.g., 10–50 mM) and dilute into aqueous media immediately before use, keeping the final DMSO concentration ≤0.1% v/v to avoid cytotoxic artefacts.
• Ethanol or methanol: May be used for analytical purposes or in assay systems tolerant of alcoholic solvents.
• Aqueous solubility enhancement: If aqueous solubility is required, consider using co-solvents, cyclodextrin complexation, or sonication-assisted dispersion.

Handling precautions: Wear appropriate PPE (gloves, lab coat, eye protection). Work in a well-ventilated area or fume hood when preparing stock solutions. Avoid prolonged skin contact. Consult the Safety Data Sheet (SDS) for full hazard information before use.

Important: Exact solubility values should be verified from the product CoA or Aladdin Scientific technical support, as solubility can vary by lot and preparation method.

Storage, Stability, and Quality Considerations

To maintain the integrity and potency of Rubiadin-1-methyl ether over the course of research studies, adherence to proper storage protocols is essential:

• Temperature: Store at the temperature specified on the product label and CoA (typically 2–8 °C or room temperature under desiccation, depending on formulation). Confirm with the current product datasheet for SKU R650736.
• Light sensitivity: Anthraquinone compounds are generally photosensitive. Store in amber vials or wrapped in foil and minimize exposure to direct light.
• Moisture: Keep the container tightly sealed and store in a dry environment. Use desiccants where appropriate.
• Freeze-thaw cycles: Minimize freeze-thaw cycles for DMSO stock solutions. Prepare single-use aliquots where possible.
• Stability monitoring: Periodically check stock solutions for precipitation or color change, which may indicate degradation. Discard compromised material and prepare fresh stocks.

Quality and purity specifications (e.g., HPLC purity ≥98%) should be verified against the CoA provided with each lot. Contact Aladdin Scientific technical support for lot-specific documentation.

Regulatory Status and Research Use Disclaimer

Rubiadin-1-methyl ether (Aladdin SKU R650736) is supplied exclusively for laboratory research and development purposes. This compound:

• Is not intended for use as a drug, food additive, agricultural chemical, or household chemical.
• Is not approved by any regulatory authority (e.g., FDA, EMA, NMPA) for therapeutic, diagnostic, or prophylactic use in humans or animals.
• Should be handled only by trained scientific personnel in appropriately equipped laboratories.
• Must be used in compliance with all applicable local, national, and international regulations governing the use of chemical reagents in research.

Aladdin Scientific provides this compound in good faith for research purposes. Users bear sole responsibility for ensuring that their use of this product complies with all applicable laws and institutional biosafety and ethics requirements. Refer to the current SDS and product datasheet for complete safety, regulatory, and quality information.