Thin-layer chromatography of dyes extracted from polyester, nylon and polyacrylonitrile fibres

Beattie, I.B.; Roberts, Helen; Dudley, R.J.

doi:10.1016/0379-0738(81)90190-0

Cited by 28 publications

(4 citation statements)

References 6 publications

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“…A number of different extraction schemes utilising a variety of solvents have been proposed. (Beattie et al, 1981a, Beattie et al, 1979, Beattie et al, 1981b, Cheng et al, 1991, Hartshorne and Laing, 1984, Home and Dudley, 1981, Laing et al, 1991, Laing et al, 1990, Macrae and Smalldon, 1979, Resua, 1980, West, 1981, Wiggins, 1999 These schemes vary in detail, but have essentially the same goal of using a sequence of extractions, which not only provide an extract of the dye but can also be used to classify the dye. A comprehensive approach is that developed by the Forensic Science Service in the United Kingdom which involves different solvent sequences depending on the identity of the fibre, which had been established by microscopy and/or infrared spectrophotometry.…”

Section: Extractionmentioning

confidence: 99%

“…Chromatography is defined by IUPAC as a "physical method of separation in which the components to be separated are distributed between two phases, one of which is stationary (stationary phase) while the other (the mobile phase) moves in a definite direction". (MacNaught and Wilkinson, 1997) The chromatographic techniques that have been used for forensic fibre dye analysis are thin layer chromatography (TLC) (Beattie et al, 1981b, Home and Dudley, 1981, Laing et al, 1990, Shaw, 1980, Wiggins, 1999, Wiggins et al, 2005 and high-performance liquid chromatography (HPLC). (Griffin and Speers, 1995, Griffin and Speers, 1999, Griffin et al, 1994, Huang et al, 2005, Huang et al, 2004, Laing et al, 1988, Oxspring et al, 1994, Petrick et al, 2006, Wheals et al, 1985, Yinon and Saar, 1991 More recently a nonchromatographic separation technique, capillary electrophoresis (CE) has also been proposed.…”

Section: Separationmentioning

confidence: 99%

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Analysis of dyes using chromatography

Lewis

2009

Identification of Textile Fibers

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The colour of fibre, present naturally or imparted through use of a dye or pigment, can be extremely discriminating for the forensic scientist. One approach for colour analysis available to the forensic scientist is chromatography and, while partially destructive of the evidence, it can provide a much greater degree of discrimination than physical or optical methods alone. This chapter will give an overview of chromatographic methods applied to the forensic analysis of dyes in fibres focusing on thin-layer chromatography (TLC). Other approaches to instrumental chromatographic analysis of dyes, including high performance liquid chromatography (HPLC) and capillary electrophoresis (CE) will also be discussed.

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Section: Extractionmentioning

confidence: 99%

Section: Separationmentioning

confidence: 99%

Analysis of dyes using chromatography

Lewis

2009

Identification of Textile Fibers

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“…Beattie et al (392) have described a simple procedure for the extraction and classification of dyes from 1 to 2 cm lengths of acetate and triacetate fibers. Similarly, TLC systems for the characterization of disperse, acidic and basic dyes extracted from polyester, nylon, and polyacrylonitrile fibers were evaluated and recommendations made regarding the selection of TLC systems for each dye class (393). Also, TLC solvent systems were recommended for direct and reactive dyes extracted from cellulosic fibers (394).…”

Section: Forensic Biochemistrymentioning

confidence: 99%

Pharmaceuticals and related drugs

Gilpin¹,

Pachla²,

Ranweiler³

1983

Anal. Chem.

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Forensic Science in Applications Reviews. Given the tremendous diversity of materials received by forensic science facilities and the varied assortment of analytical techniques applied to their characterization, there has, and will remain, serious interest on the part of forensic scientists in the subject content of most reviews appearing within this Journal. It is the aim of this article to augment these reviews with a concise survey of articles appearing in publications that primarily appeal to forensic practitioners. To accomplish this objective, we have focused our attention on the following journals:

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“…The plates were then placed into a TLC chamber containing an eluent solution. The upper layer from a 4:1:5 solution of n-butanol, acetic acid, water was used as an eluent for basic dye types on modacrylic fibers; and the ratio of those same chemicals was brought to 2:1:5 for acidic dye types on nylon as these eluent systems have been found to be the most favorable [14]. A control consisting of three dyes, Basic Blue 15, Basic Green 4, and Basic…”

Section: Thin-layer Chromatography (Tlc)mentioning

confidence: 99%

A Survey on the Microscopical and Chemical Analysis of Synthetic Wig Fibers

Joslin¹

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The goal of this study was to determine what characteristics of synthetic wigs are polymorphs; and to report the most discriminating analytical methods for microscopical and chemical examinations of wig fibers for the detection of the most variable features. Synthetic wig fibers are manufactured to take on the appearance of natural hair for either cosmetic or costume use. Subsequently, the characteristics of wig fibers, especially as a collective group within a single wig, can vary greatly from those synthetic fibers collected from garments and household items. A number of samples were collected from 50 brown, blonde and black wigs made of modacrylic, polyvinyl chloride, polypropylene, and nylon fibers. These samples were first studied with light microscopy using both bright field illumination and double polarization. The physical and optical properties of the fibers were documented including: color, longitudinal appearance, the density of the delustrant particles, the force of birefringence, and the sign of elongation. Feature vectors based upon cross-sectional shape and color were compared using cosine similarity measurements to show the high discrimination potential of these two characteristics. Fourier Transform infrared spectroscopy (FTIR) confirmed modacrylic to be the most popular fiber type. Further discrimination of modacrylic fibers based upon the presence of additives and solvent residue was achieved using principal component analysis (PCA) coupled with hierarchical clustering analysis (HCA). Thin-layer chromatography (TLC) indicated there is a wider range of complex dyes that are applied than previously expected.

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Thin-layer chromatography of dyes extracted from polyester, nylon and polyacrylonitrile fibres

Cited by 28 publications

References 6 publications

Analysis of dyes using chromatography

Analysis of dyes using chromatography

Pharmaceuticals and related drugs

A Survey on the Microscopical and Chemical Analysis of Synthetic Wig Fibers

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