Normalized absorbance spectra of astaxanthin and astaxanthin H-aggregates.

<p>The UV-Vis spectra of astaxanthin dissolved in methanol and astaxanthin dissolved in methanol in the presence of distilled water in a ratio of 1∶3 was recorded. The absorbance peak of astaxanthin dissolved in methanol and mixed with water resulted in a blue spectral shift which is indicative of the formation of H-aggregates <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0107804#pone.0107804-Khn1" target="_blank">[14]</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0107804#pone.0107804-Giovannetti1" target="_blank">[35]</a>.