New cut-off criterion for uninformative variable elimination in multivariate calibration of near-infrared spectra for the determination of heroin in illicit street drugs

✍ Scribed by Javier Moros; Julia Kuligowski; Guillermo Quintás; Salvador Garrigues; Miguel de la Guardia

• Book ID: 108048075
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 920 KB
• Volume: 630
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/j.aca.2008.10.024

✦ Synopsis

A new cut-off criterion has been proposed for the selection of uninformative variables prior to chemometric partial least squares (PLS) modelling. After variable elimination, PLS regressions were made and assessed comparing the results with those obtained by PLS models based on the full spectral range. To assess the prediction capabilities, uninformative variable elimination (UVE)-PLS and PLS were applied to diffuse reflectance near-infrared spectra of heroin samples. The application of the proposed new cut-off criterion, based on the t-Students distribution, provided similar predictive capabilities of the PLS models than those obtained using the original criteria based on quantile value. However, the repeatability of the number of selected variables was improved significantly.