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Spectral studies of the chromophore of the phycobili protein of the alga spirulina platensis



Spectral studies of the chromophore of the phycobili protein of the alga spirulina platensis



Doklady Akademii Nauk Ukrainskoi SSR Seriya B Geologicheskie Khimicheskie i Biologicheskie Nauki (9): 62-65



The chromophore of S. platensis phycobiliprotein has an absorption maximum at 578 nm in methanol, independent of concentration. This is explained by the interaction of pigment molecules with OH-groups of methanol, preventing their aggregation. In chloroform at high concentrations, pigment molecules aggregate and maximum absorption occurs at 640 nm, while dilution of the solution promotes a disaggregation of molecules and a shift of absorption maximum to 595 nm. An increase in the alcohol chromophore solution acidity (pH < 7.0) causes a loss of the absorption maximum at 578 nm and formation of a new one at 670 nm. The process is reversible. It is connected with protonization of the pigment pyrrol rings.

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