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1 H NMR study and multivariate data analysis of reindeer skin tanning methods.

https://arctichealth.org/en/permalink/ahliterature291047
Source
Magn Reson Chem. 2017 Apr; 55(4):312-317
Publication Type
Journal Article
Date
Apr-2017
Author
Lizheng Zhu
Andrew J Ilott
Eleonora Del Federico
Cindie Kehlet
Torunn Klokkernes
Alexej Jerschow
Author Affiliation
Department of Chemistry, New York University, New York, NY, USA.
Source
Magn Reson Chem. 2017 Apr; 55(4):312-317
Date
Apr-2017
Language
English
Publication Type
Journal Article
Keywords
Animals
Humans
Magnetic Resonance Spectroscopy
Multivariate Analysis
Plant Extracts - chemistry
Reindeer
Seasons
Skin - chemistry
Tanning - methods
Tannins - chemistry
Vegetables - chemistry
Abstract
Reindeer skin clothing has been an essential component in the lives of indigenous people of the arctic and sub-arctic regions, keeping them warm during harsh winters. However, the skin processing technology, which often conveys the history and tradition of the indigenous group, has not been well documented. In this study, NMR spectra and relaxation behaviors of reindeer skin samples treated with a variety of vegetable tannin extracts, oils and fatty substances are studied and compared. With the assistance of principal component analysis (PCA), one can recognize patterns and identify groupings of differently treated samples. These methods could be important aids in efforts to conserve museum leather artifacts with unknown treatment methods and in the analysis of reindeer skin tanning processes. Copyright © 2016 John Wiley & Sons, Ltd.
PubMed ID
27654838 View in PubMed
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Characterization of condensed tannins and carbohydrates in hot water bark extracts of European softwood species.

https://arctichealth.org/en/permalink/ahliterature275205
Source
Phytochemistry. 2015 Dec;120:53-61
Publication Type
Article
Date
Dec-2015
Author
Sauro Bianchi
Ivana Kroslakova
Ron Janzon
Ingo Mayer
Bodo Saake
Frédéric Pichelin
Source
Phytochemistry. 2015 Dec;120:53-61
Date
Dec-2015
Language
English
Publication Type
Article
Keywords
Biflavonoids
Catechin
Chromatography, High Pressure Liquid
Flavonoids
Glucosides - chemistry
Hot Temperature
Molecular Structure
Norway
Picea - chemistry
Pinus
Plant Bark - chemistry
Plant Extracts - chemistry
Proanthocyanidins
Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
Tannins - chemistry - isolation & purification
Water - metabolism
Abstract
Condensed tannins extracted from European softwood bark are recognized as alternatives to synthetic phenolics. The extraction is generally performed in hot water, leading to simultaneous extraction of other bark constituents such as carbohydrates, phenolic monomers and salts. Characterization of the extract's composition and identification of the extracted tannins' molecular structure are needed to better identify potential applications. Bark from Silver fir (Abies alba [Mill.]), European larch (Larix decidua [Mill.]), Norway spruce (Picea abies [Karst.]), Douglas fir (Pseudotsuga menziesii [Mirb.]) and Scots pine (Pinus sylvestris [L.]) were extracted in water at 60°C. The amounts of phenolic monomers, condensed tannins, carbohydrates, and inorganic compounds in the extract were determined. The molecular structures of condensed tannins and carbohydrates were also investigated (HPLC-UV combined with thiolysis, MALDI-TOF mass spectrometry, anion exchange chromatography). Distinct extract compositions and tannin structures were found in each of the analysed species. Procyanidins were the most ubiquitous tannins. The presence of phenolic glucosides in the tannin oligomers was suggested. Polysaccharides such as arabinans, arabinogalactans and glucans represented an important fraction of all extracts. Compared to traditionally used species (Mimosa and Quebracho) higher viscosities as well as faster chemical reactivities are expected in the analysed species. The most promising species for a bark tannin extraction was found to be larch, while the least encouraging results were detected in pine. A better knowledge of the interaction between the various extracted compounds is deemed an important matter for investigation in the context of industrial applications of such extracts.
PubMed ID
26547588 View in PubMed
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