Overview
Nornicotine is a pyridine alkaloid structurally similar to nicotine but lacking the N-methyl group. It occurs naturally in Nicotiana species (0.05-0.5% of dry weight) and some Duboisia plants. First isolated in 1903, it gained significance as a key intermediate in nicotine biosynthesis and metabolism. The compound exists as two enantiomers due to its chiral center at the 2'-position, with (S)-nornicotine being the predominant natural form. In industrial contexts, nornicotine is primarily synthesized for research purposes rather than large-scale production. Its molecular structure enables binding to neuronal nicotinic receptors, though with about 10-20% the potency of nicotine. Regulatory agencies in many countries classify it as a controlled substance precursor due to its structural relationship to nicotine.
Physical and Chemical Properties
As a liquid at room temperature, nornicotine exhibits higher polarity than nicotine due to the absence of the methyl group. Its pKa of 8.02 indicates moderately basic character, forming salts with acids. The compound is hygroscopic and readily oxidizes when exposed to air, requiring inert atmosphere storage for long-term preservation. Spectroscopic characteristics include UV absorption maxima at 260 nm and distinctive mass spectral fragmentation patterns. Chromatographic separation typically employs reverse-phase HPLC with basic mobile phases. Unlike nicotine, nornicotine shows reduced volatility due to stronger intermolecular hydrogen bonding, with a vapor pressure approximately 50% lower than nicotine at 25°C.
Main Applications
In pharmacological research, nornicotine serves as a tool compound for studying nicotinic acetylcholine receptor subtypes and nicotine addiction mechanisms. Its metabolite status makes it valuable for tobacco product analysis and smoking cessation research. Agricultural applications include use as a precursor for neonicotinoid-like insecticides, though commercial use remains limited. The compound has been investigated as a potential biomarker for tobacco use in clinical settings. Some studies explore its N-nitrosation products (NNN) in carcinogenicity research. Recent biotechnological applications involve engineered yeast strains that convert nornicotine to value-added alkaloids through biotransformation processes.
Safety and Storage
Nornicotine requires handling with appropriate PPE including nitrile gloves and eye protection due to its toxicity (LD50 ~50 mg/kg in rats). The substance readily absorbs through skin and mucous membranes. Storage should utilize amber glass bottles under nitrogen atmosphere at refrigerated temperatures to prevent degradation. Spill management requires neutralization with dilute acid followed by absorption with inert material. Waste disposal must comply with hazardous chemical regulations, typically through licensed incineration facilities. International transport often falls under UN2810 (Toxic liquid, organic, n.o.s.) with Proper Shipping Name determined by concentration.
B2B Procurement Guide
Reputable suppliers typically offer nornicotine in research quantities (1mg-10g) with HPLC purity certificates (98-99%). Bulk quantities (>100g) require special licensing in most jurisdictions. Key procurement considerations include chiral purity specifications (S/R ratio), residual solvent levels, and stability data. Leading manufacturers include pharmaceutical intermediates specialists and fine chemical producers in Germany, India, and China. Pricing varies significantly by quantity and purity, with chiral pure (S)-nornicotine commanding premiums of 30-50% over racemic material. Due to regulatory complexity, buyers should allow 4-8 weeks for international shipments and verify import/export controls.
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