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Expanding the eggshell colour gamut: uroerythrin and bilirubin from tinamou (Tinamidae) eggshells.

Abstract：

:To date, only two pigments have been identified in avian eggshells: rusty-brown protoporphyrin IX and blue-green biliverdin IXα. Most avian eggshell colours can be produced by a mixture of these two tetrapyrrolic pigments. However, tinamou (Tinamidae) eggshells display colours not easily rationalised by combination of these two pigments alone, suggesting the presence of other pigments. Here, through extraction, derivatization, spectroscopy, chromatography, and mass spectrometry, we identify two novel eggshell pigments: yellow-brown tetrapyrrolic bilirubin from the guacamole-green eggshells of Eudromia elegans, and red-orange tripyrrolic uroerythrin from the purplish-brown eggshells of Nothura maculosa. Both pigments are known porphyrin catabolites and are found in the eggshells in conjunction with biliverdin IXα. A colour mixing model using the new pigments and biliverdin reproduces the respective eggshell colours. These discoveries expand our understanding of how eggshell colour diversity is achieved. We suggest that the ability of these pigments to photo-degrade may have an adaptive value for the tinamous.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Hamchand R,Hanley D,Prum RO,Brückner C

doi

10.1038/s41598-020-68070-7

subject

Has Abstract

pub_date

2020-07-09 00:00:00

pages

11264

issue

1

issn

2045-2322

pii

10.1038/s41598-020-68070-7

journal_volume

10

pub_type

杂志文章

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