Commentary on the article recently published in the journal by Marquito et. al.

Uv-Vis Analysis of Granular Activated Algae Chlorophyll Content

“…Also, addition of hydrochloric acid leads to a decrease of the absorption band from 619 nm, and an increase of the absorption band from 540 nm, as reported by Lopes et al [20]. Both of these values are characteristic of wavelengths for chlorophylls and phaeophytins [20]. To compare the effect of the progressive addition of hydrochloric acid to the chlorophyll extract samples, the areas under the absorption band around 665-666 nm in the wavelength range of 640 -700 nm were calculated.…”

“…Thus, the bands at 415 nm and 474 nm correspond to Soret bands of phaeophytin, the band at 540 nm is characteristic to chlorophylls and phaeophytin. Also, addition of hydrochloric acid leads to a decrease of the absorption band from 619 nm, and an increase of the absorption band from 540 nm, as reported by Lopes et al [20]. Both of these values are characteristic of wavelengths for chlorophylls and phaeophytins [20].…”