An improved high-performance liquid chromatography system for the analysis of basic dyes in forensic casework

Functionalized‐multiwalled carbon nanotubes as a preconcentrating probe for rapid monitoring of cationic dyestuffs in environmental water using AP‐MALDI/MS

“…However, HPLC methods are not practically useful for analyzing basic dyestuffs because of their adsorption on the column or on other HPLC components. On the other hand, CE has been extensively used for the analysis of ionic compounds in complex samples [10,12,13]. However, it is not suitable for hydrophobic cationic dyestuffs as they readily adsorb onto the anionic inner wall of fused-silica capillaries due to their cationic characteristics.…”

Extraction and Analysis of Disperse Dyes from Colored Polyester Single Fibers Using Liquid Chromatography/Linear Ion Trap Tandem Mass Spectrometry

“…1,2 Many studies have been conducted to analyze the dyes in colored fibers using microspectrophotometry, [3][4][5][6][7][8][9][10] TLC, [11][12][13][14][15][16][17][18][19] HPLC, [20][21][22][23][24][25] and LC/MS, [26][27][28][29][30] because these dyes can provide significant information in forensic analyses.…”

“…31 Dye-extractions are performed by heating colored fibers in various solvents and solvent mixtures, [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] including the recommended pyridine/water (4:3, v/v) mixture by the SWGMAT guidelines. 32 We reported a method for extracting a residual surfactant from threads using centrifugal filtration of a methanol solution extracted into a glass capillary.…”

High‐Performance Liquid Chromatography–Ultraviolet–Visible Spectroscopy–Electrospray Ionization Mass Spectrometry Method for Acrylic and Polyester Forensic Fiber Dye Analysis*

“…HPLC techniques have been established for the separation of various dye classes; however, they are not necessarily compatible with the mass spectrometer or they have not been applied to single fibers. Griffen et al (5) developed an isocratic solvent system for the separation of an unknown mixture of basic dyes. Azo sulfonated acid dyes were separated by Chen et al (6) using a methanol and aqueous ammonium acetate mobile phase, while azo and anthraquinone acid dyes were separated by Holčapek et al (7) with a similar gradient.…”