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Ketamine Hydrochloride: Chemical Profile, Analytical Methods, and Regulatory Compliance

Published by: Mind Botanica Lab Technical Documentation Series

Subject: Ketamine Hydrochloride (CAS 1867-66-9)

Target Audience: Analytical Chemists, Preclinical Researchers, Quality Control Laboratories

Classification: Analytical Reference Material / Controlled Substance

Technical Overview & Physicochemical Data

Ketamine Hydrochloride ($\text{C}_{13}\text{H}_{16}\text{ClNO} \cdot \text{HCl}$) is a white, crystalline arylcyclohexylamine derivative widely utilized in neuropharmacological research, clinical trial development, and forensic analytical calibration.

1. Molecular Structure & Isomeric Considerations

Ketamine possesses a chiral center at the C-2 position of the cyclohexanone ring, resulting in two optical enantiomers: $(S)\text{-ketamine}$ (esketamine) and $(R)\text{-ketamine}$ (arketamine).

• Racemic Mixture: Standard analytical reference materials generally exist as the racemic $(\pm)\text{-ketamine}$ hydrochloride salt.

• Binding Affinity Distinctions: The $(S)\text{-enantiomer}$ exhibits approximately a 3- to 4-fold higher binding affinity for the phencyclidine (PCP) site on the NMDA receptor complex compared to the $(R)\text{-enantiomer}$.

2. Pharmacological Signaling Mechanisms

In preclinical models, Ketamine exhibits a complex pharmacological profile involving multiple central nervous system target sites:

1. NMDA Receptor Antagonism: Ketamine acts as an uncompetitive channel blocker at the N-methyl-D-aspartate (NMDA) receptor, reducing calcium channel conductance.

2. Glutamatergic Activation: Blockade of NMDA receptors on GABAergic interneurons leads to transient disinhibition of presynaptic glutamate release.

3. AMPA & Synaptogenesis Cascades: Increased synaptic glutamate engages post-synaptic AMPA receptors, initiating downstream signaling through brain-derived neurotrophic factor (BDNF) and mammalian target of rapamycin complex 1 (mTORC1), which drives synaptic plasticity changes.

3. Analytical Characterization Protocols

Accurate qualitative and quantitative determination of Ketamine Hydrochloride in laboratory settings relies on standardized chromatographic and spectroscopic methods:

High-Performance Liquid Chromatography (HPLC)

• Column: $\text{C}_{18}$ reverse-phase ($150 \text{ mm} \times 4.6 \text{ mm}$, $5 \mu\text{m}$)

• Mobile Phase: Isocratic mixture of phosphate buffer ($\text{pH } 3.0$) and acetonitrile ($80:20 \text{ v/v}$)

• Detection Wavelength: UV at $215 \text{ nm}$ or $269 \text{ nm}$

Gas Chromatography-Mass Spectrometry (GC-MS)

• Sample Preparation: Methanol dissolution or derivative conversion (e.g., trimethylsilyl derivative for trace metabolite screening).

• Quantitation Ion: Primary fragment ion at $m/z = 180$ (base peak), alongside precursor ions at $m/z = 209$ and $m/z = 237$.

4. Regulatory Framework & Handling Controls

Because Ketamine Hydrochloride is a controlled substance internationally (e.g., Schedule III in the United States, Class B in the United Kingdom), laboratories handling this compound must maintain strict compliance protocols:

• Chain of Custody: Materials must be logged, tracked, and stored in secure, access-controlled vault facilities.

• Documentation Requirements: Acquisition requires verified institutional permits, federal agency registrations (such as a DEA license), and executed End-User Declarations (EUD).

• Waste & Disposal: Residual reference material must be destroyed according to regional environmental and controlled substance regulatory guidelines.

Ketamine Hydrochloride (Analytical Reference Data)

Chemical Name: $(\pm)\text{-2-(2-chlorophenyl)-2-(methylamino)cyclohexan-1-one hydrochloride}$

CAS Registry Number: 1867-66-9

Chemical Formula: $\text{C}_{13}\text{H}_{16}\text{ClNO} \cdot \text{HCl}$

Molecular Weight: $274.19 \text{ g/mol}$

Solubility: Freely soluble in water ($200 \text{ mg/mL}$), soluble in methanol and ethanol

Melting Point: $258^\circ\text{C} – 263^\circ\text{C}$ (Decomposition)

1. Chemical Structure & Identification/Buy Ketamine Powder Online

Ketamine belongs to the arylcyclohexylamine class of chemical compounds and exists as a racemic mixture of two enantiomers: $(S)\text{-ketamine}$ (esketamine) and $(R)\text{-ketamine}$ (arketamine).

• IUPAC Name: 2-(2-chlorophenyl)-2-(methylamino)cyclohexan-1-one hydrochloride

• Canonical SMILES: CNC1(CCCCC1=O)C2=CC=CC=C2Cl.Cl

• InChI Key: YTFGGWJGKSLKNG-UHFFFAOYSA-N

• Monoisotopic Mass: $237.092 \text{ g/mol}$ (Free Base)

2. Pharmacological Mechanism

Ketamine produces its primary physiological and neuropharmacological effects through several distinct signaling pathways:

1. NMDA Receptor Antagonism: Ketamine binds to the phencyclidine (PCP) site within the open channel of the N-methyl-D-aspartate (NMDA) receptor, blocking calcium influx and reducing excitatory neurotransmission.

2. AMPAR Depolarization & BDNF Release: Inhibition of NMDA receptors on GABAergic interneurons leads to a downstream burst of glutamate, activating post-synaptic $\alpha$-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors and triggering brain-derived neurotrophic factor (BDNF) release.

3. mTORC1 Pathway Activation: AMPA receptor activation downstream promotes mammalian target of rapamycin complex 1 (mTORC1) signaling, facilitating dendritic spine density increases and synaptic plasticity.

3. Regulatory & Analytical Context

• Control Status: Ketamine is classified as a controlled substance in most international jurisdictions (e.g., Schedule III in the United States, Class B in the United Kingdom).

• Laboratory Reference Standards: In analytical environments, high-purity crystalline reference materials are evaluated using High-Performance Liquid Chromatography (HPLC-UV), Gas Chromatography-Mass Spectrometry (GC-MS), and Nuclear Magnetic Resonance (NMR) spectroscopy for quantitative assay validation and forensic profiling.