Carminic Acid Based Red Dye from Scale Insects Detected in Red Ruby-Crowned Kinglet Feathers by Surface-Enhanced Raman Scattering,ChemPlusChem

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Carminic Acid Based Red Dye from Scale Insects Detected in Red Ruby-Crowned Kinglet Feathers by Surface-Enhanced Raman Scattering
ChemPlusChem ( IF 3.0 ) Pub Date : 2021-07-19 , DOI: 10.1002/cplu.202100178
Xuanyi Wu _{1,

2} , Santiago Sanchez-Cortes ₃ , Ioanna Kakoulli _{1,

2}

Affiliation

In most birds, red feather color is linked to diet and attributed to carotenoids contained in plants and fruits. In the red crown feathers of the Ruby-crowned Kinglet (Regulus calendula), a new biopigment was identified based on carminic acid, the main coloring compound of cochineal (Dactylopius coccus) and other scale insects. This has revealed a potential new class of carminic acid-based biopigments, not previously identified in feathers. In this research, red crown feathers of a Ruby-crowned Kinglet were analyzed by surface-enhanced Raman scattering (SERS) employing synthesized silver star-shaped colloids as the nanoplasmonic platform. Results indicated peaks at 450, 670, 1290–1312, 1355, 1410, 1570, 1620 cm⁻¹ in the feather SERS spectra characteristic of carminic acid. SERS has proven to be an extremely sensitive, non-destructive technique for the identification of different feather biopigments, even at trace quantities and in the presence of other predominant coloring substances.

中文翻译：

通过表面增强拉曼散射在红宝石冠小鸟羽毛中检测到来自介壳虫的胭脂红酸红色染料

在大多数鸟类中，红色羽毛的颜色与饮食有关，并归因于植物和水果中含有的类胡萝卜素。在红宝石冠小王（ Regulus calendula ）的红色冠羽中，人们鉴定出了一种基于胭脂红酸的新生物色素，胭脂红酸是胭脂红（ Dactylopius coccus ）和其他介壳虫的主要着色化合物。这揭示了一种潜在的新型胭脂红酸基生物色素，以前在羽毛中未发现过。在这项研究中，采用合成银星形胶体作为纳米等离子体平台，通过表面增强拉曼散射（SERS）分析了红宝石冠小王的红色冠羽。结果表明，胭脂红酸的羽毛 SERS 光谱特征在 450、670、1290-1312、1355、1410、1570、1620 cm ^-1处有峰。 SERS 已被证明是一种极其灵敏、非破坏性的技术，可用于识别不同的羽毛生物色素，即使是痕量且存在其他主要着色物质的情况下也是如此。

更新日期：2021-08-17

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