Penilaian bersistem spektroskopi mikro-ATR-FTIR yang digabungkan dengan analisis multivariat untuk analisis forensik pen mata bulat dakwat hitam

Translated title of the contribution: Systematic assessment of attenuated total reflectance-fourier transforms infrared spectroscopy coupled with multivariate analysis for forensic analysis of black ballpoint pen inks

Loong Chuen Lee, Mohamed Rozali Othman, H. Pua

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This manuscript aims to provide a new and non-destructive method for systematic analysis of inks on a questioned document. Ink samples were analyzed in situ on the paper substrate by micro-ATR-FTIR spectroscopy and the data obtained was processed and evaluated by a series of multivariate chemometrics. Absorbance value from wavenumbers of 2000-675 cm-1 were first processed by cluster analysis (CA), followed by principal component analysis (PCA) to form a set of new variables. Subsequently, the variables set was used for classification, differentiation and identification of 155 sample pens that comprise nine different brands. Results show that nine black ballpoint pen brands could be classified into three main groups via discriminant analysis (DA). Differentiation analyses of nine different pen brands performed using one-way ANOVA indicated only two pairs of brands cannot be differentiated at 95% confidence interval. Finally an identification flow chart was proposed to determine the brand of unknown pen inks. As a conclusion, the proposed method for extracting and creating a new variable set from infrared spectrum was evaluated to be satisfactory for systematic analysis of inks based on their infrared spectrum.

Original languageUndefined/Unknown
Pages (from-to)262-272
Number of pages11
JournalMalaysian Journal of Analytical Sciences
Volume16
Issue number3
Publication statusPublished - 2012

Fingerprint

Ink
Infrared radiation
Cluster analysis
Discriminant analysis
Analysis of variance (ANOVA)
Principal component analysis
Spectroscopy
Multivariate Analysis
Substrates

Keywords

  • ATR-FTIR spectroscopy
  • Classification
  • Differentiation
  • Forensic science
  • Ink analysis
  • Multivariate analysis

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

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title = "Penilaian bersistem spektroskopi mikro-ATR-FTIR yang digabungkan dengan analisis multivariat untuk analisis forensik pen mata bulat dakwat hitam",
abstract = "This manuscript aims to provide a new and non-destructive method for systematic analysis of inks on a questioned document. Ink samples were analyzed in situ on the paper substrate by micro-ATR-FTIR spectroscopy and the data obtained was processed and evaluated by a series of multivariate chemometrics. Absorbance value from wavenumbers of 2000-675 cm-1 were first processed by cluster analysis (CA), followed by principal component analysis (PCA) to form a set of new variables. Subsequently, the variables set was used for classification, differentiation and identification of 155 sample pens that comprise nine different brands. Results show that nine black ballpoint pen brands could be classified into three main groups via discriminant analysis (DA). Differentiation analyses of nine different pen brands performed using one-way ANOVA indicated only two pairs of brands cannot be differentiated at 95{\%} confidence interval. Finally an identification flow chart was proposed to determine the brand of unknown pen inks. As a conclusion, the proposed method for extracting and creating a new variable set from infrared spectrum was evaluated to be satisfactory for systematic analysis of inks based on their infrared spectrum.",
keywords = "ATR-FTIR spectroscopy, Classification, Differentiation, Forensic science, Ink analysis, Multivariate analysis",
author = "Lee, {Loong Chuen} and Othman, {Mohamed Rozali} and H. Pua",
year = "2012",
language = "Undefined/Unknown",
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AU - Othman, Mohamed Rozali

AU - Pua, H.

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N2 - This manuscript aims to provide a new and non-destructive method for systematic analysis of inks on a questioned document. Ink samples were analyzed in situ on the paper substrate by micro-ATR-FTIR spectroscopy and the data obtained was processed and evaluated by a series of multivariate chemometrics. Absorbance value from wavenumbers of 2000-675 cm-1 were first processed by cluster analysis (CA), followed by principal component analysis (PCA) to form a set of new variables. Subsequently, the variables set was used for classification, differentiation and identification of 155 sample pens that comprise nine different brands. Results show that nine black ballpoint pen brands could be classified into three main groups via discriminant analysis (DA). Differentiation analyses of nine different pen brands performed using one-way ANOVA indicated only two pairs of brands cannot be differentiated at 95% confidence interval. Finally an identification flow chart was proposed to determine the brand of unknown pen inks. As a conclusion, the proposed method for extracting and creating a new variable set from infrared spectrum was evaluated to be satisfactory for systematic analysis of inks based on their infrared spectrum.

AB - This manuscript aims to provide a new and non-destructive method for systematic analysis of inks on a questioned document. Ink samples were analyzed in situ on the paper substrate by micro-ATR-FTIR spectroscopy and the data obtained was processed and evaluated by a series of multivariate chemometrics. Absorbance value from wavenumbers of 2000-675 cm-1 were first processed by cluster analysis (CA), followed by principal component analysis (PCA) to form a set of new variables. Subsequently, the variables set was used for classification, differentiation and identification of 155 sample pens that comprise nine different brands. Results show that nine black ballpoint pen brands could be classified into three main groups via discriminant analysis (DA). Differentiation analyses of nine different pen brands performed using one-way ANOVA indicated only two pairs of brands cannot be differentiated at 95% confidence interval. Finally an identification flow chart was proposed to determine the brand of unknown pen inks. As a conclusion, the proposed method for extracting and creating a new variable set from infrared spectrum was evaluated to be satisfactory for systematic analysis of inks based on their infrared spectrum.

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KW - Ink analysis

KW - Multivariate analysis

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