Cyanidin (Anthocyanidin · Antioxidant · Vascular Protection)

Compound	Cyanidin
Chemical class	Polyphenol — Anthocyanidin (3,5,7,3′,4′-Pentahydroxyflavylium)
CAS	528-58-5
Primary source	Rubus fruticosus (blackberry), Sambucus nigra (elderberry), Vaccinium spp.
Key applications	Antioxidant, vascular protection, anti-inflammatory
Claim strength	Moderate
Typical form	Blackberry extract; anthocyanin-standardised berry extracts
Buy from Herbuno	Blackberry Fruit Liquid Extract (Water Soluble) - Rubus fruticosus → Blackberry Fruit Extract Powder - Rubus fruticosus →

Name origin: From Greek kyanos (blue) — reflecting the blue-red pigmentation cyanidin imparts to many fruits and flowers. Cyanidin is the most widely distributed anthocyanidin in the plant kingdom, forming glycosides (anthocyanins) in the majority of red, purple, and blue plant pigments. Traditional use: Blackberry, elderberry, and other cyanidin-rich berry preparations have traditional use across European, North American, and Asian herbal medicine for immune support, respiratory infections, urinary tract health, and as general tonics. The purple-red pigments of these preparations were historically associated with antioxidant and circulatory benefits. Research trajectory: Cyanidin and its glycosides have a substantial clinical literature, primarily from mixed berry anthocyanin preparations. Individual compound attribution is complicated by the fact that most clinical studies use standardised anthocyanin fractions rather than isolated cyanidin. Commercial source: Commercially available via blackberry and elderberry fruit extracts standardised to anthocyanin content. See sourcing options below.

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Evidence for Cyanidin Applications

Antioxidant capacity: Cyanidin has exceptionally high antioxidant capacity in ORAC and DPPH assays — the 3′,4′-catechol B-ring and the flavylium chromophore contribute to electron transfer radical scavenging. Human supplementation studies with anthocyanin-rich berry preparations consistently show increased plasma antioxidant capacity and reduced oxidative stress biomarkers. Claim strength: High (for berry anthocyanin extracts; cyanidin-specific attribution moderate).

Vascular protection and endothelial function: Cyanidin activates eNOS and promotes NO-mediated vasodilation in endothelial cell models. Berry anthocyanin preparations containing cyanidin improve flow-mediated dilation (FMD) in human RCTs. Reduction of arterial stiffness and LDL oxidation are documented in berry extract clinical studies. Claim strength: Moderate.

Anti-inflammatory: Cyanidin inhibits NF-κB, COX-2, and TNF-α in macrophage models. In vivo animal anti-inflammatory studies confirm efficacy. The catechol B-ring contributes both to antioxidant capacity and anti-inflammatory enzyme interaction. Claim strength: Moderate.

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Dosage & Formulator Specification

Clinical studies using berry anthocyanin preparations: 150–300 mg/day total anthocyanins for cardiovascular and antioxidant applications. Cyanidin constitutes the dominant anthocyanidin in most red-purple berry extracts; in blackberry and elderberry, cyanidin glycosides represent 60–90% of total anthocyanin content.

Specify standardised anthocyanin content (pH differential method or HPLC) for blackberry extract. Herbuno supplies Blackberry Extract Powder and Blackberry Fruit Liquid Extract; request an anthocyanin profile CoA confirming cyanidin-3-glucoside and cyanidin-3-rutinoside as primary cyanidin glycoside constituents.

Anthocyanins including cyanidin are water-soluble but highly pH-sensitive — stable (red-purple) at acidic pH (below 3.5), bleached to colourless chalcone forms at neutral pH, and degraded at alkaline pH. For beverage or liquid supplement applications, pH below 3.5 is critical for colour and stability. Encapsulation in maltodextrin or microencapsulation for powder applications improves stability.

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Frequently Asked Questions — Cyanidin

What is the difference between cyanidin the aglycone and cyanidin-3-glucoside?
Cyanidin is the aglycone (sugar-free) anthocyanidin. In plant tissues and extracts, cyanidin occurs predominantly as glycosides — most commonly cyanidin-3-glucoside (C3G), cyanidin-3-rutinoside, and cyanidin-3-sambubioside. The glycosides are more water-soluble and more stable than the aglycone. After consumption, glycosides are hydrolysed to yield cyanidin aglycone and the sugar, which is absorbed and metabolised.

Why do anthocyanins change colour with pH?
The flavylium cation (anthocyanin chromophore) is the red-purple form stable at acidic pH. At neutral pH, it undergoes rapid hydration to the colourless carbinol pseudobase. At alkaline pH, further transformation to the blue quinonoidal base occurs, followed by degradation. This pH dependence is fundamental to anthocyanin formulation; maintaining acidic pH below 3.5 is essential for colour stability and is also associated with better bioactivity preservation.

Is there a meaningful difference between cyanidin from blackberry versus elderberry?
The primary cyanidin glycosides differ: blackberry is dominant in cyanidin-3-glucoside and cyanidin-3-rutinoside; elderberry contains mainly cyanidin-3-glucoside and cyanidin-3-sambubioside. Both are hydrolysed to cyanidin aglycone in vivo. For antioxidant and cardiovascular applications, the glycoside identity has limited practical significance; for botanical identity and label authenticity, the glycoside profile is the distinguishing factor.

Can cyanidin-standardised extracts be used in capsules without pH concerns?
Yes. Encapsulated dry powder formats experience minimal pH exposure during storage. pH sensitivity is primarily a concern for liquid, beverage, and RTD applications. Standard hard or soft gelatin capsules provide an adequate environment for anthocyanin stability during shelf life, provided moisture is controlled and heat exposure is minimised during manufacturing.

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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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