Morin (C5297): Natural Flavonoid Antioxidant for Mitochondrial Energy Modulation

Executive Summary: Morin (CAS 480-16-0) is a natural flavonoid isolated from Maclura pomifera with a chemical identity of 2-(2,4-dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one and molecular weight 302.24 Da (APExBIO). It exerts potent antioxidant and anti-inflammatory effects, with direct inhibition of adenosine 5′-monophosphate deaminase (AMPD) activity to improve mitochondrial energy metabolism in podocytes, as demonstrated in diabetic kidney injury models (Yang et al., 2025). Morin additionally serves as a fluorescent aluminum ion probe in biochemical assays due to its chelating properties. The compound is highly pure (≥98%), soluble in DMSO (≥19.53 mg/mL) and ethanol (≥6.04 mg/mL), but insoluble in water, and requires storage at -20°C for optimal stability (APExBIO). These features position Morin as a robust tool for research in oxidative stress, metabolic disease, and advanced cell-based assays.

Biological Rationale

Morin is a polyphenolic compound classified as a natural flavonoid. It is extracted from Maclura pomifera and structurally defined as 2-(2,4-dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one. Flavonoids are known for their broad-spectrum antioxidant and anti-inflammatory properties (APExBIO). Morin’s molecular formula is C₁₅H₁₀O₇, and its molecular weight is 302.24 Da. It is widely used for investigating oxidative stress, mitochondrial dysfunction, and inflammation signaling pathways in cellular and animal models of diabetes, cancer, and neurodegeneration (Yang et al., 2025).

Mechanism of Action of Morin

Morin modulates multiple cellular pathways:

• Antioxidant Activity: It scavenges reactive oxygen species (ROS) and reduces oxidative damage.
• Anti-inflammatory Effect: Morin downregulates pro-inflammatory cytokines and signaling cascades.
• AMPD Inhibition: It directly inhibits adenosine 5′-monophosphate deaminase (AMPD), particularly the AMPD2 isoform, reducing purine nucleotide cycle (PNC) flux and preserving mitochondrial ATP production (Yang et al., 2025).
• Neuroprotection and Cardioprotection: The compound stabilizes mitochondrial function, preventing cellular energy failure in neurons and cardiomyocytes.
• Fluorescent Chelation: Morin forms stable fluorescent complexes with Al³⁺ ions, enabling sensitive detection in biochemical assays (APExBIO).

These properties allow Morin to be deployed for both mechanistic studies and as a functional probe in metabolic, renal, and neurodegenerative research models.

Evidence & Benchmarks

• Morin inhibits AMPD activity in podocytes, leading to improved mitochondrial ultrastructure, decreased UACR, and restored synaptopodin expression in high-fructose rat models (Yang et al., 2025).
• Morin demonstrates solubility of ≥19.53 mg/mL in DMSO and ≥6.04 mg/mL in ethanol, with optimal storage at -20°C to preserve stability and biological activity (APExBIO).
• Purity is consistently ≥98% as confirmed by HPLC, MS, and NMR; batch-to-batch reproducibility is validated (APExBIO).
• Morin forms highly fluorescent chelates with Al³⁺ ions, providing an effective detection method for aluminum in biological samples (APExBIO).
• In vitro, Morin treatment of MPC5 podocytes exposed to 5 mM fructose led to significant suppression of AMPD activity and mitigation of glycolytic overactivation (Yang et al., 2025).

This article extends prior coverage by providing direct evidence for Morin's role in AMPD2 inhibition and mitochondrial rescue, clarifying molecular mechanisms alluded to in Morin: Next-Generation Flavonoid for Mitochondrial Modula... (which focused on its dual probe-bioactivity role).

Applications, Limits & Misconceptions

Morin is used extensively in models of diabetes, metabolic syndrome, cancer biology, and neurodegenerative diseases due to its multi-modal bioactivity. In cell-based assays, Morin is used to probe mitochondrial energy metabolism and oxidative stress responses. Its fluorescent chelating capability makes it ideal for aluminum ion detection in complex matrices. For a practical guide to cell-based workflow optimization and troubleshooting with Morin, see Morin (C5297): Data-Driven Solutions for Cell-Based Assays; this article updates that content by integrating new in vivo mechanistic findings.

Common Pitfalls or Misconceptions

• Morin is insoluble in water; aqueous stock solutions are unstable and not recommended for biological assays (APExBIO).
• Aluminum detection is selective but may be confounded by other strong chelators present in assay buffers.
• Morin's AMPD2 inhibition is validated in renal and metabolic models but not yet in all cancer or neurodegenerative disease systems.
• Extended storage of solutions at >4°C or repeated freeze-thaw cycles may result in degradation and loss of bioactivity.
• Morin should not be used as a therapeutic in humans; it is strictly intended for research use only (APExBIO).

Workflow Integration & Parameters

• Solubility: Dissolve Morin at ≥19.53 mg/mL in DMSO or ≥6.04 mg/mL in ethanol. Use immediately or aliquot and store at -20°C for short-term use.
• Dosage: In vitro effective concentrations typically range from 1–50 μM, with 5 mM fructose as an established stressor in podocyte models (Yang et al., 2025).
• Stability: Avoid repeated freeze-thaw cycles; prepare fresh working solutions for each experiment.
• Assay Compatibility: Compatible with fluorescence-based aluminum detection assays, mitochondrial membrane potential measurements, and immunoblotting for synaptopodin and AMPD2.

For data-driven troubleshooting and advanced protocol design, refer to Morin (C5297): Data-Driven Solutions for Cell Viability, ..., which this article extends by providing new quantitative in vivo benchmarks for AMPD2 modulation.

Conclusion & Outlook

Morin (C5297) from APExBIO is a validated, high-purity, natural flavonoid antioxidant and mitochondrial energy modulator. Its dual role as both an AMPD2 inhibitor and a fluorescent aluminum ion probe underpins its utility in metabolic, renal, and neurodegenerative disease research. Continuous integration of mechanistic and assay-oriented evidence will further refine Morin’s positioning as an indispensable research reagent. For detailed product specifications and ordering, visit the official Morin product page.