Add time:08/20/2019         Source:sciencedirect.com

The bioluminescent squid, Watasenia scintillas has three visual pigments. The major pigment, based on retinal (λmax 484 nm), is distributed over the whole retina. Another pigment based on 3-dehydroretinal (λmax ≈ 500 nm) and the third pigment (λmax 470 nm) are localized in the specific area of the ventral retinal just receiving the downwelling light. Visual pigment was extracted and purified from the dissected retina. The chromophores were then extracted and analyzed with HPLC, NMR, infrared and mass spectroscopy, being compared with the synthetic 4-hydroxyretinal. A new retinal derivative, 11-cis-4-hydroxyretinal, is identified as the chromophore of the third visual pigment of the squid.

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