Overview
Phytomelatonin is the plant-derived form of melatonin, initially discovered in 1995. Unlike animal melatonin, it serves primarily as a growth regulator and stress response compound in plants. It is biosynthesized from tryptophan via the shikimate pathway and found in varying concentrations across species, with particularly high levels in medicinal herbs like Hypericum perforatum and edible plants like cherries and tomatoes. Commercial phytomelatonin is typically extracted from rice, grapes, or walnuts using ethanol or supercritical CO2 methods. Its molecular structure is identical to animal melatonin, but its functional roles in plants differ significantly, focusing on UV protection, root development, and abiotic stress mitigation rather than sleep regulation.
Physical and Chemical Properties
As an indoleamine compound, phytomelatonin exhibits strong UV absorption at 222nm and 278nm, useful for HPLC quantification. Its lipophilic nature allows easy passage through cell membranes, while the presence of both amine and amide groups enables hydrogen bonding. The compound shows remarkable stability in acidic conditions but degrades under prolonged light exposure or alkaline environments. Notable chemical behaviors include scavenging hydroxyl radicals (•OH) and singlet oxygen (¹O₂), with antioxidant capacity 200% higher than vitamin E. Differential scanning calorimetry reveals an endothermic peak at 118°C corresponding to its crystalline structure transition. In aqueous solutions, it forms micelles at concentrations above 0.5mM due to its amphiphilic character.
Main Applications
In agriculture, phytomelatonin is increasingly used as a biostimulant at 0.1-10μM concentrations to enhance crop resilience against drought, salinity, and heavy metals. Field trials with wheat showed 15-20% yield improvement under water stress when treated with 5μM phytomelatonin solutions. Organic farmers value its OMRI-listed status as a natural alternative to synthetic plant growth regulators. The nutraceutical industry utilizes plant-derived melatonin in sleep aid supplements, often marketed as "vegan melatonin." Common formulations combine phytomelatonin extracts from Montmorency tart cherries (containing 0.1-0.3μg/g) with magnesium, achieving synergistic effects. Recent research explores its potential in cosmetic anti-aging formulations due to superior skin penetration compared to animal-derived melatonin.
Safety and Storage
LD50 studies in rats show low acute toxicity (>2000mg/kg oral). However, purity is critical—commercial preparations must be tested for residual solvents (ethanol <5000ppm) and heavy metals (Pb <3ppm). Improper storage leads to dimerization; argon gas flushing is recommended for long-term bulk storage to prevent oxidation. For laboratory handling, PPE including nitrile gloves and dust masks is advised when working with powder forms. Shipping regulations classify it as non-hazardous material, but some airlines restrict pure phytomelatonin powder above 100g due to its biological activity. Stability tests indicate 36-month shelf life when stored in amber glass at 4°C with desiccant.
B2B Procurement Guide
Industrial buyers should specify: 1) Extraction source (single plant species preferred for consistency), 2) Third-party validated purity (≥98% for pharmaceutical use), and 3) ISO 22000 or FSSC 22000 certification for food-grade material. MOQs typically start at 5kg for 99% purity, with lead times of 4-6 weeks for customized extraction batches. Key suppliers are concentrated in China (for rice-derived), Italy (grape-derived), and the U.S. (walnut-derived). Payment terms commonly involve 30% advance with LC at sight. For research institutions, Sigma-Aldrich offers 1g analytical standards at approximately $120, while bulk agricultural-grade (95%) trades at $50-80/kg FOB Shanghai.
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