Overview of heat treatment of MAAs

Two MAAs, porphyra-334 and parisin, were prepared from red alga Dalus. The MAAs exhibited absorption maxima between 310 and 360 nm, whereas the heat-treated MAAs lost these wavelengths and exhibited absorption maxima between 210 and 225 nm. In high-performance liquid chromatography (HPLC), differences were also observed in the elution times of the compounds (Figure 2).