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<p>From the first botanical characterization of cyanobacteria about two centuries ago to contemporary studies, only two categories of extracellular UV-screening pigments have been considered: scytonemin which is very well described and gloeocapsin, which remains enigmatic. In this study, we use Raman microspectroscopy to compare the extracellular EPS-associated pigment produced by the strain <i>Chamaesiphon polonicus</i> SAG 32.87 with gloeocapsins, scytonemins and other natural and synthetic pigments. Chemometrics analyses of Raman data reveal the existence of a third and new category of cyanobacterial extracellular pigment.</p>

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Novel Raman signature evidences an unknown cyanobacterial pigment

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月5日

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  • Yannick J. Lara,
  • Alexandre Lambion,
  • Emmanuelle J. Javaux

摘要

From the first botanical characterization of cyanobacteria about two centuries ago to contemporary studies, only two categories of extracellular UV-screening pigments have been considered: scytonemin which is very well described and gloeocapsin, which remains enigmatic. In this study, we use Raman microspectroscopy to compare the extracellular EPS-associated pigment produced by the strain Chamaesiphon polonicus SAG 32.87 with gloeocapsins, scytonemins and other natural and synthetic pigments. Chemometrics analyses of Raman data reveal the existence of a third and new category of cyanobacterial extracellular pigment.