Violaxanthin (Xanthophyll Carotenoid · Antioxidant · Antiproliferative)

Compound	Violaxanthin (5,6,5′,6′-Diepoxy-β,β-carotene-3,3′-diol; all-trans-violaxanthin)
Chemical class	Terpenoid — Carotenoid (Xanthophyll; diepoxy diol)
CAS	126-29-4
Primary source	Viola tricolor (pansy), Viola odorata (sweet violet), Helianthus annuus (sunflower)
Key applications	Antioxidant; antiproliferative; xanthophyll cycle intermediate; anti-inflammatory
Claim strength	Moderate
Typical form	Gul Banafsha Extract Powder (Viola odorata); Sweet Violet Flower Liquid Extract
Buy from Herbuno	Gul banafsha Extract Powder - Viola Odorata → Sweet Violet Flower Liquid Extract (Water Soluble) - Viola odorata →

Name origin: Violaxanthin takes its name from Viola — the genus of pansies and sweet violets from which it was first isolated. It is classified as a diepoxy xanthophyll: a carotenoid bearing two epoxide groups (5,6 and 5′,6′) and two hydroxyl groups on the β-carotene backbone. Traditional use: Viola odorata (sweet violet, Gul Banafsha in Unani and Persian medicine) has one of the longest documented phytomedicinal histories — used for cough, bronchial inflammation, skin conditions, and headache in Ayurvedic, Unani, and European herbal traditions. The violet pigment was prized for both perfumery and medicine; violaxanthin contributes to the characteristic golden-orange tone of some Viola petal preparations. Research trajectory: Violaxanthin's primary biological relevance in plants is as a central component of the xanthophyll cycle — the reversible de-epoxidation to antheraxanthin and zeaxanthin that regulates photoprotection. In mammalian biology, antioxidant, antiproliferative, and anti-inflammatory activities have been characterised. Commercial source: Violaxanthin is available from Herbuno via Gul Banafsha Extract Powder and Sweet Violet Flower Liquid Extract, traditional Unani botanical products delivering the full Viola phytochemical spectrum.

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Evidence for Violaxanthin Applications

Antioxidant activity: Violaxanthin is an effective singlet oxygen quencher via its extended polyene chromophore (11 conjugated double bonds). The two epoxide groups modulate both excited-state energy transfer and radical trapping geometry. In carotenoid comparisons, violaxanthin's diepoxy structure places it below zeaxanthin and astaxanthin but above alpha-carotene for singlet oxygen quenching capacity. Claim strength: Moderate.

Antiproliferative activity: Violaxanthin has demonstrated dose-dependent antiproliferative activity in breast, lung, and colon cancer cell lines at 10–50 μM concentrations, with G0/G1 arrest and modulation of cyclin-dependent kinase inhibitors (p21, p27). Mechanism involves mitochondrial pathway apoptosis without significant effect on normal cell viability in comparative studies. All data are in vitro. Claim strength: Emerging.

Anti-inflammatory: COX-2 suppression and reduction of prostaglandin E₂ production have been documented in LPS-stimulated macrophage models. The polar epoxide-hydroxyl carotenoid structure may facilitate interaction with membrane-associated inflammatory enzymes more readily than apolar carotenoids. Claim strength: Emerging.

Photoprotection and eye health: Violaxanthin is the precursor to zeaxanthin via the xanthophyll cycle — both dietary violaxanthin and zeaxanthin are relevant to macular pigment density. Whether oral violaxanthin is converted to zeaxanthin with sufficient efficiency to contribute to macular protection is not established in human studies. Claim strength: Emerging.

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Dosage & Formulator Specification

No human clinical dosing data exist for isolated violaxanthin. Viola odorata preparations in traditional and modern use are dosed at 2–5 g/day dried herb equivalent or 200–500 mg of a 5–10:1 extract, primarily for respiratory and skin applications rather than carotenoid delivery. Violaxanthin content in Viola extracts is variable and not typically quantified in commercial CoAs.

For formulators specifically targeting violaxanthin as a carotenoid bioactive, specialised carotenoid-rich algal or microalgal extracts or concentrated pansy petal preparations are alternative sources with higher violaxanthin density. Commercial standardisation to violaxanthin specifically is not yet mainstream.

Carotenoid stability considerations apply: violaxanthin is sensitive to light, heat, and oxidation, and requires antioxidant protection (mixed tocopherols, ascorbyl palmitate) in formulations. Encapsulation in oil-based softgel or microencapsulated powder formats is recommended for shelf stability. The epoxide groups are particularly susceptible to acid-catalysed rearrangement to auroxanthin at low pH.

No drug interactions are documented for violaxanthin. Violaxanthin's non-provitamin A status (no unhindered beta-ionone ring) means high-dose provitamin A concerns do not apply.

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Frequently Asked Questions — Violaxanthin

What is the xanthophyll cycle and where does violaxanthin fit?
The xanthophyll cycle is a reversible carotenoid interconversion in plant chloroplasts: violaxanthin (diepoxy) → antheraxanthin (monoepoxy) → zeaxanthin (no epoxide), catalysed by violaxanthin de-epoxidase under high light. This regulates photoprotective energy dissipation. The same carotenoids are relevant to animal biology via dietary intake and mammalian retinal physiology.

Is violaxanthin a provitamin A carotenoid?
No. Both beta-ionone rings carry epoxide groups that block retinal cleavage, so violaxanthin has no provitamin A activity. This distinguishes it from beta-carotene and alpha-carotene and means it does not contribute to vitamin A status.

Which Herbuno products supply violaxanthin?
Gul Banafsha Extract Powder and Sweet Violet Flower Liquid Extract (both Viola odorata) are the primary Herbuno sources, delivering violaxanthin within the full Viola phytochemical spectrum.

Can violaxanthin be positioned for eye health similarly to lutein and zeaxanthin?
Not with equivalent evidence. Lutein and zeaxanthin have strong RCT evidence (AREDS2) for age-related macular degeneration prevention. Violaxanthin's conversion to macular zeaxanthin after oral ingestion has not been established in clinical studies.

Related compounds: Zeaxanthin, Lutein, Neoxanthin, Beta-Carotene

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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