Capillary Zone Electrophoresis of Water-Soluble Black Pen Inks

Tsutsumi, Kazuhiro; Ohga, Kazuya

doi:10.2116/analsci.12.997

Cited by 13 publications

(2 citation statements)

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“…The latter point is especially attractive in forensics since only very small quantities of material are needed for analysis, meaning that there is minimal destruction of evidence material. CE has therefore found considerable application in ink analysis, where it has been found to be superior to TLC and HPLC in the analysis of inks from fountain pens [4][5][6] ball-point pens [2,[7][8][9], fibre-tip pens [10,11], as well as for the analysis of textile fibres [12,13]. In all cases, the developed methods can be divided into two distinct categories: those based on capillary zone electrophoresis for the separation of acidic dyes at high pH, and those based on micellar electrokinetic chromatography (MEKC) for the separation of acidic and basic dyes at high pH.…”

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confidence: 99%

Non-aqueous capillary electrophoresis with red light emitting diode absorbance detection for the analysis of basic dyes

Fakhari

Breadmore

Macka

et al. 2006

Analytica Chimica Acta

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Section: Introductionmentioning

confidence: 99%

Non-aqueous capillary electrophoresis with red light emitting diode absorbance detection for the analysis of basic dyes

Fakhari

Breadmore

Macka

et al. 2006

Analytica Chimica Acta

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“…A number of papers have been published regarding techniques for forensic examinations, including visible spectrophotometry 1,2 , thin-layer chromatography (TLC) 1-4 , X-ray microanalysis 1 , microspectrophotometry 3,5 , high-performance liquid chromatography (HPLC) 6 , gel electrophoresis 7 and capillary zone electrophoresis. 8,9 TLC is the simplest of those methods, and is effective for separating dyestuff components. A systematic TLC study, however, has been pursued only slightly concerning the analysis of Japanese writing inks.…”

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Analysis of Writing Ink Dyestuffs by TLC and FT-IR and Its Application to Forensic Science

Tsutsumi

Ohga

1998

ANAL. SCI.

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Various writing implements have often been used at crime scenes in Japan. One of the purposes for the examination of writing ink is to specify writing implements. A number of papers have been published regarding techniques for forensic examinations, including visible spectrophotometry 1,2 , thin-layer chromatography (TLC) 1-4 , X-ray microanalysis 1 , microspectrophotometry 3,5 , high-performance liquid chromatography (HPLC) 6 , gel electrophoresis 7 and capillary zone electrophoresis. 8,9 TLC is the simplest of those methods, and is effective for separating dyestuff components. A systematic TLC study, however, has been pursued only slightly concerning the analysis of Japanese writing inks. In the present paper we describe a preliminary preparation of a standard TLC library for inks, and also discuss the effectiveness and limitation of TLC for the identification of writing implements. We also report on a microsampling technique, that is often requested in the analysis of inks on questioned documents, and the application of a pin-point condensation technique 10 to the identification of dye TLC bands by microscope/Fourier transform infrared spectroscopy (FT-IR). Experimental Pens and reagentsIn this work were used 161 kinds of black, red and blue pens, which were classified for convenience into four groups, as shown in Table 1: oil-based ball-point and marking pens as well as aqueous roller-ball and marking pens. They are now on the market, and some of them were kindly supplied by their manufacturers. Reference dyestuffs were obtained from manufacturers and the Identification Reference Data Center, National Police Agency, Tokyo, Japan. Water was purified by reverse osmosis (Millipore Milli RO15) and deionization. Developing organic solvents for TLC were of reagent grade, and were distilled before use. All other chemicals were also of reagent grade and were used 269 ANALYTICAL SCIENCES APRIL 1998, VOL. 14 1998 © The Japan Society for Analytical Chemistry Black, blue and red writing pens were classified into various groups using the Rf values and color tones of dyestuff bands separated by normal-phase thin-layer chromatography (TLC) of their inks. The classification is effective for the preliminary identification of pens used in crime scenes. A microsampling technique was proposed for the TLC analysis of minute quantities of inks on questioned documents. Furthermore, a combination of reflectance-mode microscope/Fourier transform infrared spectroscopy and the pin-point condensation technique was proved to be useful for the precise discrimination of trace amounts of analogous water-soluble dyestuffs on TLC plates. Analysis of Writing Ink Dyestuffs by TLC and FT-IR and Its

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Characterisation of permanent markers by pyrolysis gas chromatography–mass spectrometry

et al. 2011

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Pyrolysis gas chromatography-mass spectrometry (PyGC-MS) was used as a rapid method for the characterization of permanent marker ink. Twenty-four samples of various colours purchased from different manufacturers were characterised. Four main typologies of polymer-binding medium could be distinguished on the basis of the pyrolysis products, and differentiation between permanent markers of different manufacturers could be accomplished. For some permanent marker samples, PyGC-MS analysis allowed pigment identification as well.

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Capillary Zone Electrophoresis of Water-Soluble Black Pen Inks

Cited by 13 publications

References 4 publications

Non-aqueous capillary electrophoresis with red light emitting diode absorbance detection for the analysis of basic dyes

Non-aqueous capillary electrophoresis with red light emitting diode absorbance detection for the analysis of basic dyes

Analysis of Writing Ink Dyestuffs by TLC and FT-IR and Its Application to Forensic Science

Characterisation of permanent markers by pyrolysis gas chromatography–mass spectrometry

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