Journal Published Online: 01 November 1995
Volume 40, Issue 6

The Differentiation of Illicit Methaqualone Tablet Formulations Using Principal Component and Soft Independent Modeling of Class Analogy Analysis of Their Near-Infrared Reflectance Spectra



The viability of using principal component analysis (PCA) and soft independent modeling of class analogy analysis (SIMCA) of the near-infrared reflectance spectra of illicit methaqualone tablet formulations as an aid in sample differentiation was investigated.

Near-infrared spectra of ten different illicit species occurring on the South African market was obtained through direct diffuse reflectance measurements made on the tablet surfaces using a bidirectional fiber-bundle probe.

The learning set was analyzed using PCA and SIMCA and resolved in well-separated clusters thus making differentiation possible.

Author Information

Van Zyl, EF
Forensic Science Laboratory, Pretoria, Republic of South Africa
Louw, M
Forensic Science Laboratory, Pretoria, Republic of South Africa
Pages: 5
Price: $25.00
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Stock #: JFS13879J
ISSN: 0022-1198
DOI: 10.1520/JFS13879J