Glucoerucin (Rocket Glucosinolate · Erucin Isothiocyanate Precursor · Nrf2 Activator)

Compound	Glucoerucin (4-Methylthiobutyl glucosinolate; Erucin glucosinolate)
Chemical class	Glucosinolate — Methylthioalkyl glucosinolate (S-containing secondary metabolite)
CAS	20010-21-1
Primary source	Eruca sativa (rocket / arugula, leaves and seeds), Raphanus sativus (radish)
Key applications	Erucin (anticarcinogenic metabolite) precursor; antioxidant; anti-inflammatory; cardiovascular; availability on request
Claim strength	Moderate
Typical form	Rocket/arugula seed extract; glucoerucin isolate (research grade); dietary rocket consumption
Buy from Herbuno	Request availability and bulk pricing →

Name origin: From Eruca (the rocket/arugula genus; from Latin eruca = caterpillar, referring to the hairy leaves) + glucosinolate suffix. Glucoerucin is the primary glucosinolate of rocket (Eruca sativa) — the compound that defines rocket’s characteristic pungent, peppery flavour when the plant is chewed (myrosinase-catalysed hydrolysis of glucoerucin to erucin isothiocyanate is responsible for the pungency and pharmacological activity). Metabolic pathway: Glucoerucin → erucin (4-methylthiobutyl isothiocyanate) via myrosinase (on tissue disruption during chewing or processing). Erucin is closely related structurally to sulforaphane (glucoraphanin → sulforaphane from broccoli), differing only in the sulfur oxidation state: erucin has a methylthio group (S), sulforaphane has a methylsulfinyl group (S=O). Despite this minor structural difference, erucin and sulforaphane have overlapping but distinct Nrf2-activating and anticarcinogenic activity profiles. Traditional use: Rocket/arugula has been consumed as a salad green and medicinal plant since ancient Roman and Greek times — used as an aphrodisiac, digestive stimulant, and diuretic. The peppery flavour (glucoerucin-derived) was prized. Rocket seeds were used in Roman medicine as condiment and medicine. Commercial source: Arugula Seed Oil from Herbuno provides eruca-derived actives; glucoerucin itself requires rocket leaf/seed extract specifically. Contact Herbuno for availability.

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Evidence for Glucoerucin / Erucin Applications

Nrf2 activation and cancer chemoprevention (via erucin): Erucin (the hydrolysis product of glucoerucin) activates Nrf2 by alkylating Keap1 cysteines — the same mechanism as sulforaphane. Erucin induces phase II detoxification enzymes (quinone reductase, glutathione S-transferase) and antioxidant response genes. In animal carcinogenesis models, erucin reduces chemically-induced mammary, colon, and bladder tumour incidence. Claim strength: Moderate (preclinical; limited human data vs sulforaphane).

Cardiovascular — NO production: Erucin promotes endothelial nitric oxide (eNOS) upregulation and has anti-platelet activity in vascular cell models — potentially relevant for cardiovascular protection. Claim strength: Moderate (in vitro).

Anti-inflammatory: Erucin inhibits NF-κB and reduces inflammatory cytokine production in macrophage models. Claim strength: Moderate (in vitro).

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Frequently Asked Questions — Glucoerucin

How does erucin compare to sulforaphane?
Erucin (methylthio) and sulforaphane (methylsulfinyl) have nearly identical Nrf2-activating mechanisms via Keap1 alkylation. The key difference: sulforaphane’s methylsulfinyl group is slightly more electrophilic, giving it modestly higher Keap1 reactivity and somewhat faster Nrf2 activation kinetics. Erucin is less oxidised and may be more stable. In comparative studies, erucin shows similar but slightly lower chemopreventive potency than sulforaphane per mole in some assays but is more effective in others. For formulators, broccoli-derived sulforaphane has a vastly larger evidence base; erucin from rocket is a scientifically valid but less commercially established alternative.

Why does rocket (arugula) taste so peppery?
The peppery flavour of rocket is exclusively from erucin (erucin isothiocyanate) released when glucoerucin is hydrolysed by myrosinase on chewing — the same mechanism as the pungency of horseradish, wasabi, and mustard (from their respective glucosinolates/isothiocyanates). The amount of pungency in a rocket leaf depends on: glucoerucin content (varies by cultivar, growing conditions, and maturity); myrosinase activity; and chewing intensity. Young rocket leaves have lower glucoerucin content and milder flavour; mature leaves are more pungent.

Is raw or cooked arugula better for glucoerucin activity?
Raw arugula is preferable for maximum erucin generation. Cooking denatures myrosinase, preventing glucoerucin hydrolysis to active erucin isothiocyanate. However, the glucoerucin itself survives mild cooking and reaches the colon, where gut bacteria with myrosinase-like activity can generate erucin from glucoerucin. This gut-bacterial conversion is less efficient than plant myrosinase but provides some activity even from cooked rocket. A practical approach: add rocket raw to cooked dishes (salads, toppings) for maximum erucin generation.

Is Eruca sativa seed oil the same as glucoerucin?
No — Eruca sativa seed oil (taramira, jamba oil) is the pressed oil from rocket seeds, rich in erucic acid (a fatty acid) and glucosinolates. Erucic acid (a C22 monounsaturated fatty acid) and glucoerucin (a C5 glucosinolate) are different molecules despite the similar name. The seed oil contains some glucoerucin in the aqueous phase of pressed seed material but oil extraction does not effectively capture water-soluble glucosinolates. For glucoerucin-specific applications, seed or leaf extracts (aqueous or hydroethanolic) rather than seed oil are the appropriate formats.

Related compounds: Glucoraphanin, Sulforaphane, Indole-3-Carbinol, Sinigrin

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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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