A fast and reliable detection of indigo in historic and prehistoric textile samples

Abstract

We present a method requiring no sample preparation for the direct identification of indigoid colorants in tiny amounts in ancient historic fabrics using ASAP®-MS. Exact determinations were completed in less than 1 min. Copyright © 2015 John Wiley & Sons, Ltd.

Fast direct detection of natural dyes in historic and prehistoric textiles by flowprobe™-ESI-HRMS

“…In a recent study we applied ASAP-MS 23 for the direct characterization of indigoid dyes in various historic textiles. However, rather harsh conditions of the ionization process were unsuitable for detecting (quasi)molecular ions of more sensitive colorants, e.g.…”

“…Blue bers 23 and red bers 38 were extracted as previously reported. Residual material (being insoluble in methanol or acetonitrile) from the extraction with formic acid-ethylenediaminetetraacetic acid was hydrolyzed with hydrochloric acid.…”

“…S4 and S5). 23,38,40 For UV-Vis spectra of samples A-G measured in diffuse reectance mode, see One important point especially in the investigations of archaeological material is the question if the sample will be destroyed during the measurement. From Fig.…”

“…Optical microscopic (transmission light and digital microscope), ATR-FTIR (Fourier transform infrared in attenuated total reection mode) spectroscopic, SEM (scanning electron microscopy), SEM-EDX (the combination of SEM with energy dispersive X-ray spectroscopy), HPLC-DAD (system 1), LC-ESI-MS/MS (triple quadrupole, system 3 and 4) and ASAP-MS (capillary temperature: 150-250 C, capillary voltage: 100-180 V, source voltage: 10-20 V, source voltage dynamic: 0-25 V, corona discharge: 5 mA, APCI source temperature: 250-400 C, positive and negative mode) studies were performed as previously reported. 23,38 UV-Vis-spectra were measured in diffuse reectance mode with a Cary 60 spectrophotometer from Agilent Technologies equipped with a remote diffuse reection probe (Video Barrelino™) from Harrick Scientic (measurement range: 200-800 nm; white standard: BaSO 4 ). The LMJ-SSP experiments were performed using a Prosolia owprobe™ system coupled to a QExactive™ Hybrid Quadrupole-Orbitrap mass spectrometer from Thermo Scien-tic (solvent for anthraquinones: methanol : water (1 : .…”

“…The vat dyeing process using synthetic indigo was performed as previously reported. 23 Mordanting procedure of silken and woolen material (modied according to Cardon 4 ):…”