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Updated: Feb 15, 2026
10:49
Planar and Three-Dimensional Printing of Conductive Inks
Published on: December 9, 2011
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The Chromophore and Polypeptide Composition of Aplysia Ink
The Biological Bulletin
|January 10, 2018
Summary
Sea hare ink contains pigments derived from red algae, identified as phycourobilin, phycoerythrobilin, and phycocyanobilin. The ink also contains several polypeptides, with major bands at 78,000 and 61,000 molecular weight.
Area of Science:
- Marine Biology
- Biochemistry
- Chemical Ecology
Background:
- Sea hare ink is a defensive secretion with a complex chemical composition.
- Understanding the ink's components is crucial for elucidating its ecological role and evolutionary origins.
Purpose of the Study:
- To characterize the tetrapyrrole and polypeptide composition of sea hare ink.
- To identify the origin of the pigment components within the ink.
Main Methods:
- Ink separation using thin-layer and gel filtration chromatography.
- Spectroscopic analysis of pigment components.
- Sodium dodecyl sulfate gel electrophoresis for polypeptide analysis.
Main Results:
- Three distinct pigment components were isolated and identified as phycourobilin (red), phycoerythrobilin (purple), and phycocyanobilin (blue).
- These pigments are derived from tetrapyrrole chromophores found in red algae, a component of the sea hare's diet.
- Electrophoresis revealed several polypeptides, with prominent bands at 78,000 and 61,000 molecular weight.
Conclusions:
- The primary pigments in sea hare ink originate from dietary red algae.
- Biliproteins are likely minor components of the ink, with tetrapyrroles being the dominant pigment class.
- The study elucidates the dietary source and biochemical basis of sea hare ink coloration.
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