Fluorescence of Wool Grease

Collins, Stephen and Davidson, R. Stephen (1994) Fluorescence of Wool Grease. Dyes and Pigments, 25 (4). pp. 255-279. ISSN 0143-7208. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

Wool yolk is highly fluorescent. The amount of wool yolk and intensity of wool yolk fluorescence varies along a Merino wool fibre. The fluorescence intensity of the yolk increases on travelling from tip to the root. Two components-'grease' and chlorophyll-contribute to the fluorescence of wool grease. The 'grease' fluorescence reveals the presence of a number of chromophores/components. An attempt to separate the chemical constituents and identify them was only partly successful as each of nine fractions obtained by preparatory thin-layer chromatography exhibited similar fluorescence properties. There are two types of chlorophyll present-chlorophyll a and chlorophyll b. Chlorophyll could be detected in all the wool greases examined. Artificial UV irradiation gave rise to a number of complex photochemical reactions including the destruction of chlorophyll. After an initial decrease in fluorescence intensity (for unknown reasons), there is a change of non-fluorescing visible-absorbing species to fluorescing UV-absorbing species before a final change in the latter to the former. The relative size of the changes was different for two different wool greases examined. In-situ studies using blue light as the irradiation source suggest that it also causes a (slower) decrease in fluorescence intensity, but proportionally faster for the 'grease' component than for the chlorophyll component.

Item Type: Article
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts
Depositing User: P. Ogbuji
Date Deposited: 02 Jul 2009 16:09
Last Modified: 16 May 2014 09:26
Resource URI: https://kar.kent.ac.uk/id/eprint/20461 (The current URI for this page, for reference purposes)
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