Über die durch Trocknen bewirkten Absorptions-Änderungen von Chloroplasten und Algen

Abstract

Derivative spectra of isolated chloroplasts in water of air dried and freeze dried chloroplasts are compared with spectra of lipid extracts free of solvent. During freeze drying the chlorophyll does not dissolve in the separated chloroplast lipids as appears to follow from X-ray investigations. By freeze drying, the red absorption of algae and isolated chloroplasts is shifted more or less to longer wavelengths. During slow drying in air the red absorption band is shifted by some algae to shorter wavelengths. Some algae do not show this shift. These changes of absorption are partly caused by different selective light scattering and partly by an alteration of the relative amounts of various spectroscopic forms of the chlorophyll a. A clear decision upon these two factors is impossible.