ISSN: 0022-1198
CODEN: JFSCA
Page Count: 5

The Differentiation of Illicit Methaqualone Tablet Formulations Using Principal Component and Soft Independent Modeling of Class Analogy Analysis of Their Near-Infrared Reflectance Spectra
Van Zyl, EF
Forensic Analysts, Forensic Science Laboratory,

Louw, M
Forensic Analysts, Forensic Science Laboratory,

(Received 13 December 1994; accepted 12 April 1995)

Abstract

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.

Keywords:
forensic science, criminalistics, principal component analysis, soft independent modeling of class analogy, near-infrared spectroscopy, illicit methaqualone tablet formulations, drug sample differentiation

Paper ID: JFS13879J
DOI: 10.1520/JFS13879J
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