Negative ion electrospray mass spectrometry of neoflavonoids

Hulme, Alison N.; McNab, Hamish; Peggie, David A.; Quye, Anita

doi:10.1016/j.phytochem.2005.09.001

Cited by 30 publications

(24 citation statements)

References 6 publications

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“…The type B compound (Bra ) is a brazilein derivative (and not brazilein) [79]. Brazilein, the oxidized form of brazilin, was detected in the brazilin standard purchased from Pflatz and Bauer similar to a previous report [86] and in redwood raw source; both standard and dyestuff were simply dissolved in MeOH:H 2 O (1/1) i.e. samples were not treated with HCl.…”

Section: Hplc Analysissupporting

confidence: 59%

Investigation of the colourants used in icons of the Cretan School of iconography

Karapanagiotis

Minopoulou

Valianou

et al. 2009

Analytica Chimica Acta

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Section: Hplc Analysissupporting

confidence: 59%

Investigation of the colourants used in icons of the Cretan School of iconography

Karapanagiotis

Minopoulou

Valianou

et al. 2009

Analytica Chimica Acta

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“…In fact, oxalic acid yields slightly higher peak areas for the brazilwood chromophores (5 and 6, Table 1), while EDTA-2 is more effective in the extraction of the haematein (7, Table 1). Neoflavonoids are very sensitive to light degradation [33], and only very small amounts of intact chromophores are expected to be present in historical textiles requiring, therefore, very effective extraction methods for their recovery.…”

Section: Evaluation Of the Extraction Proceduresmentioning

confidence: 99%

“…Type C compound was identified together with several weld chromophores in the light brown sample S4 and in yellow sample S14. Brazilwood is known for its fast light degradation [33], and the colour fading in Arraiolos carpets has already been described by Pessanha [35], who stated that some areas originally dyed in red hues became brownish with time. Sample S3 was taken from the filling colour of the studied carpet, and sample S14 belongs to the border and fringe (Fig.…”

Section: Luteolinmentioning

confidence: 99%

Extracting natural dyes from wool—an evaluation of extraction methods

et al. 2011

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The efficiency of eight different procedures used for the extraction of natural dyes was evaluated using contemporary wool samples dyed with cochineal, madder, woad, weld, brazilwood and logwood. Comparison was made based on the LC-DAD peak areas of the natural dye's main components which had been extracted from the wool samples. Among the tested methods, an extraction procedure with Na 2 EDTA in water/DMF (1:1, v/v) proved to be the most suitable for the extraction of the studied dyes, which presented a wide range of chemical structures. The identification of the natural dyes used in the making of an eighteenth century Arraiolos carpet was possible using the Na 2 EDTA/DMF extraction of the wool embroidery samples and an LC-DAD-MS methodology. The effectiveness of the Na 2 EDTA/DMF extraction method was particularly observed in the extraction of weld dye components. Nine flavone derivatives previously identified in weld extracts could be identified in a single historical sample, confirming the use of this natural dye in the making of Arraiolos carpets. Indigo and brazilwood were also identified in the samples, and despite the fact that these natural dyes were referred in the historical recipes of Arraiolos dyeing, it is the first time that the use of brazilwood is confirmed. Mordant analysis by ICP-MS identified the widespread use of alum in the dyeing process, but in some samples with darker hues, high amounts of iron were found instead.

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“…4 Local opinion was that indigo was more likely to have been used to colour the fabric blue, but extracts from fragments of the brown ground cotton fabric analysed using high performance liquid chromatography-photodiode array detector (HPLC-PDA) did not detect the presence of either indigotin, or a hematin-elimination-product, the marker for the acid extract from logwood. 5 It was believed that any remaining dye was below the detection limit having been removed by rubbing or by water over the years, or degraded by ageing. It is likely that a painted application of indigo or logwood would fade more readily than the same pigment applied by a dyeing technique.…”

Section: Investigationmentioning

confidence: 99%