Next Article in Journal
Comment on: Synthesis of New Azo Compounds Based on N-(4-Hydroxyphenyl)maleimide and N-(4-Methylphenyl)maleimide. Molecules 2010, 15, 7498–7508
Next Article in Special Issue
Deepening Inside the Pictorial Layers of Etruscan Sarcophagus of Hasti Afunei: An Innovative Micro-Sampling Technique for Raman/SERS Analyses
Previous Article in Journal
Cytotoxic Effects of Diterpenoid Alkaloids Against Human Cancer Cells
Previous Article in Special Issue
It’s Only a Part of the Story: Analytical Investigation of the Inks and Dyes Used in the Privilegium Maius
Open AccessArticle

A Mass Spectrometric Study on Tannin Degradation within Dyed Woolen Yarns

Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124 Pisa, Italy
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(12), 2318; https://doi.org/10.3390/molecules24122318
Received: 27 May 2019 / Revised: 15 June 2019 / Accepted: 20 June 2019 / Published: 22 June 2019
(This article belongs to the Special Issue Natural Dyes)
Natural tannins from various plants have been used throughout human history in textile dyeing, often as mordant dyes. The ageing behavior of these dyes is a challenge in conservation science, requiring a thorough knowledge of the textile–mordant-dye system. In this work, we analyzed reference wool yarns dyed with natural tannins from oak gallnuts, walnut (Juglans regia), and catechu (Acacia catechu), after artificial ageing. To gain insights on the composition of the dyestuffs and on how they aged, an analytical procedure based on extraction with Na2EDTA/DMF (ethylenediaminetetraacetic acid/dimethylformamide) and high-performance liquid chromatography (HPLC) analysis using high-resolution mass spectrometry detection was used. Since conventional reversed-phase (RP) columns usually show poor retention efficiency of highly polar compounds such as tannins, an RP-amide embedded polar group stationary phase was used to achieve optimal retention of the most polar compounds. Tannins from oak gallnuts showed little degradation after ageing, while a significant increase in the content of hydroxybenzoic acids was observed for tannins from walnut and catechu. Finally, the analytical procedure was applied to characterize the tannin dyes in historical tapestries from the 15th to 16th century, and the results were discussed in comparison with the reference yarns. View Full-Text
Keywords: natural tannins; polyphenols; high-resolution mass spectrometry; oak gallnut; Juglans regia; Acacia catechu natural tannins; polyphenols; high-resolution mass spectrometry; oak gallnut; Juglans regia; Acacia catechu
Show Figures

Figure 1

MDPI and ACS Style

Degano, I.; Mattonai, M.; Sabatini, F.; Colombini, M.P. A Mass Spectrometric Study on Tannin Degradation within Dyed Woolen Yarns. Molecules 2019, 24, 2318.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop