Spirulina (Arthrospira platensis) has been consumed by humans since ancient times. It is rich in high added-value compounds such as chlorophylls, carotenoids and polyphenols. Pulsed electric fields (PEF) an innovative non-thermal technique that improves the extraction of bioactive from diverse sources. PEF pre-treatment (3 kV/cm, 100 kJ/kg) combined with supplementary binary solvents at differe...

I. Substrate specificity of POR Several modified Pchlid derivatives were tested for substrate activity with POR (Griffiths, 1991; Helfrich, 1995; Helfrich et al., 1996; Schoch et al., 1995; Klement et al., 1999). The central Mg can be substituted by Zn while the metal-free Pchlid and the Ni, Co, and Cu complex are inactive. Modifications of the side chains at rings A and B are throughout tolera...

Action spectra of the Emerson effect in Chlorella and Navicula reveal peaks at 670 mut, in addition to those at 650 mu (Chlorella) and 630 mmicro (Navicula) attributable to chlorophylls b and c. Thus, excitation of chlorophyll a form "chlorophyll a 670" can supplement, in these algae, the excitation of the form "chlorophyll a 680-700." The effect of the auxiliary pigments in these algae may be ...

Pigment-protein complexes separated from wheat (Triticum aestivum L. selection ND96-25 by two gel electrophoresis techniques were analyzed by high-performance liquid chromatography for chlorophylls and carotenoids. The two techniques are compared, and pigment analyses are given for the major reaction centers and light-harvesting complexes. Reaction centers contain mostly chlorophyll a, carotene...