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Spontaneous hydrolysis of heroin in buffered solution
Canadian Journal of Physiology and Pharmacology
|August 1, 1978
Summary
Heroin spontaneously hydrolyzes to 06-monoacetylmorphine (06-MAM) in buffer solutions. This decomposition occurs faster at pH 7.4 than at pH 6.4, with no further breakdown to morphine observed.
Area of Science:
- Forensic Chemistry
- Analytical Chemistry
- Pharmaceutical Chemistry
Background:
- Understanding drug stability is crucial for forensic analysis and pharmaceutical development.
- Heroin (diacetylmorphine) is an opioid analgesic with a known potential for degradation.
Purpose of the Study:
- To investigate the spontaneous hydrolysis of heroin in aqueous buffer solutions.
- To quantify the primary decomposition product and determine hydrolysis kinetics.
Main Methods:
- Electron-capture gas-liquid chromatography (EC-GLC) was employed for quantitative analysis.
- Heroin solutions in phosphate buffers (pH 6.4 and 7.4) were incubated at 23°C for 24 hours.
- Deacetylated products were derivatized and analyzed using nalorphine as an internal standard.
Main Results:
- Heroin primarily decomposes to 06-monoacetylmorphine (06-MAM).
- Hydrolysis was significantly faster at pH 7.4 (k = 9.6 x 10⁻⁵ min⁻¹) compared to pH 6.4 (k = 3.0 x 10⁻⁵ min⁻¹).
- After 24 hours, 13% decomposition to 06-MAM occurred at pH 7.4, versus 4% at pH 6.4.
Conclusions:
- Spontaneous hydrolysis of heroin is pH-dependent, proceeding faster under neutral to slightly alkaline conditions.
- The primary degradation pathway involves deacetylation to 06-MAM, without significant formation of morphine.
- These findings are relevant for understanding heroin stability in forensic samples and biological matrices.