Retusin: Properties, Bioactivity & Research Applications

Retusin is a naturally occurring polymethoxylated flavonoid isolated from various plant sources, attracting growing interest in biomedical research for its reported antioxidant, anti-inflammatory, and cytotoxic properties.

Compound Class

Polymethoxylated flavonoid (flavonol subclass)

CAS Number

480-19-3

Molecular Formula

C17H14O7

Molecular Weight

334.28 g/mol

Primary Natural Source

Isolated from Retusin-containing plants including species of the genus Dodonaea and related taxa

Solubility

Soluble in DMSO and ethanol; limited aqueous solubility

Aladdin SKU

R709673

Chemical Identity and Structure

Retusin (CAS 480-19-3) is a polymethoxylated flavonol with the molecular formula C₁₇H₁₄O₇ and a molecular weight of approximately 334.28 g/mol. It belongs to the flavonoid superfamily, which constitutes one of the most abundant classes of plant secondary metabolites. The core scaffold of Retusin is based on the 2-phenylchromen-4-one (flavone) skeleton, with multiple methoxy substituents that distinguish it from simpler hydroxyflavones.

These methoxy groups contribute to the compound's moderate lipophilicity, influencing membrane permeability and metabolic stability relative to their hydroxylated analogs. Researchers should note that Retusin's limited aqueous solubility necessitates dissolution in organic solvents such as DMSO or ethanol prior to preparation of working solutions for cell-based or biochemical assays.

Natural Sources and Isolation

Retusin has been reported as a constituent of several plant species, with documented occurrence in members of the family Sapindaceae, notably within the genus Dodonaea. It has also been identified in other plant taxa across different botanical families, reflecting the widespread biosynthetic capacity for polymethoxylated flavonoids in the plant kingdom.

In the context of traditional ethnobotanical use, plants containing Retusin and related flavonoids have been used in various folk medicine systems, providing early leads for phytochemical investigation. Modern isolation of Retusin from plant material typically involves solvent extraction followed by chromatographic purification techniques such as column chromatography, preparative HPLC, or a combination thereof. For research use, however, chemically synthesized or semi-synthetic material of defined purity is generally preferred to ensure experimental reproducibility.

Reported Biological Activities

Retusin has been investigated in preclinical settings for a range of biological activities consistent with those observed for the broader polymethoxylated flavonoid class:

• Antioxidant activity: Like many polyphenolic compounds, Retusin has been evaluated for its capacity to scavenge reactive oxygen species (ROS) and modulate oxidative stress pathways, properties that underlie interest in its cytoprotective potential.
• Anti-inflammatory effects: Preliminary studies have examined Retusin's ability to modulate pro-inflammatory mediators and signaling cascades, including pathways relevant to cytokine production.
• Cytotoxic and antiproliferative properties: In vitro studies have explored Retusin's effects on cancer cell lines, investigating its potential to inhibit cell proliferation and induce apoptosis.
• Antimicrobial potential: Some investigations have assessed activity against bacterial or fungal pathogens, a common area of inquiry for plant-derived flavonoids.

Researchers are encouraged to consult primary literature for specific mechanistic data, as the depth of investigation varies across these activity areas. All currently reported data are from in vitro or early-stage in vivo studies; clinical evidence is not established.

Handling, Storage, and Preparation Guidelines

Proper handling and storage of Retusin are essential to maintain compound integrity and ensure reliable experimental results:

• Storage: Store the neat compound in a cool, dry, dark environment, typically at −20 °C or as specified on the product datasheet, protected from light and moisture. Flavonoids can undergo oxidative degradation upon prolonged exposure to air, light, or elevated temperatures.
• Solubilization: Prepare stock solutions in anhydrous DMSO or ethanol. Ensure complete dissolution by brief vortexing or sonication. For aqueous working solutions, dilute stock into aqueous buffer immediately before use to minimize precipitation. Final DMSO concentrations in cell culture assays should generally not exceed 0.1% (v/v) to avoid solvent cytotoxicity artifacts.
• Stability: Avoid repeated freeze-thaw cycles. Aliquot stock solutions to prevent degradation from repeated exposure to ambient conditions.
• Safety: Handle in accordance with standard laboratory safety protocols. Consult the Safety Data Sheet (SDS) provided with the product for specific hazard information.

Research Applications and Experimental Considerations

Retusin serves as a useful tool compound in several research contexts:

• Phytochemistry and natural product chemistry: As a reference standard or analytical standard for quantification of Retusin in plant extracts by HPLC, LC-MS, or related techniques.
• Pharmacological screening: As a test compound in enzyme inhibition assays, receptor binding studies, or cell-based phenotypic screens investigating flavonoid bioactivity.
• Oxidative stress research: In assays measuring ROS scavenging capacity (e.g., DPPH, ABTS assays) or cellular oxidative stress models.
• Cancer biology: In cell viability, apoptosis, and cell cycle analyses using cancer cell line models.

When designing experiments, researchers should include appropriate vehicle controls, establish dose-response relationships, and verify compound purity and identity (e.g., by NMR or HPLC-UV) before committing to large-scale studies. Given the early-stage nature of Retusin research, results should be interpreted with appropriate caution and in the context of the broader flavonoid literature.

Frequently asked questions

What is Retusin and how is it classified chemically?

Retusin is a polymethoxylated flavonol, a subclass of flavonoids — plant polyphenolic secondary metabolites. It has the molecular formula C17H14O7, a molecular weight of approximately 334.28 g/mol, and is identified by CAS number 480-19-3. Its multiple methoxy substituents on the flavonol scaffold distinguish it from simpler hydroxyflavones.

How should Retusin be dissolved for cell-based assays?

Retusin has limited aqueous solubility and should first be dissolved in anhydrous DMSO or ethanol to prepare a concentrated stock solution. For cell-based assays, this stock should be diluted into the appropriate aqueous buffer or culture medium immediately before use. Final DMSO concentration in culture wells should generally be kept at or below 0.1% (v/v) to avoid solvent-related cytotoxic effects on cells.

What biological activities has Retusin been investigated for?

Retusin has been studied preclinically for antioxidant, anti-inflammatory, cytotoxic/antiproliferative, and antimicrobial activities, consistent with the broader polymethoxylated flavonoid class. These investigations have primarily been conducted in vitro or in early-stage animal models. No clinical evidence has been established, and researchers should consult primary literature for specific mechanistic and quantitative data.

What are the recommended storage conditions for Retusin (SKU R709673)?

Retusin should be stored in a cool, dry, and dark environment, typically at −20 °C, protected from light and moisture. Stock solutions should be aliquoted to avoid repeated freeze-thaw cycles, which can accelerate compound degradation. Always refer to the product datasheet supplied by Aladdin Scientific for the most current and product-specific storage guidance.

Is Retusin suitable for use as an analytical reference standard?

Yes, high-purity Retusin such as that offered by Aladdin Scientific (SKU R709673) can serve as an analytical reference standard for the identification and quantification of Retusin in plant extracts or formulations by techniques such as HPLC and LC-MS. Researchers should confirm the purity specification on the current certificate of analysis (CoA) before use in quantitative analytical applications.

References

1. Harborne JB, Williams CA. Advances in flavonoid research since 1992. Phytochemistry. 2000;55(6):481-504. doi:10.1016/S0031-9422(00)00235-1
2. Middleton E Jr, Kandaswami C, Theoharides TC. The effects of plant flavonoids on mammalian cells: implications for inflammation, heart disease, and cancer. Pharmacol Rev. 2000;52(4):673-751. PMID:11121513
3. Ross JA, Kasum CM. Dietary flavonoids: bioavailability, metabolic effects, and safety. Annu Rev Nutr. 2002;22:19-34. doi:10.1146/annurev.nutr.22.111401.144957

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