Influence of Seasonal Variations on Extract Yield and Antioxidant Activities of Some Seaweed Species

Exploring Bioactive Components and Assessing Antioxidant and Antibacterial Activities in Five Seaweed Extracts from the Northeastern Coast of Algeria

“…The extraction of bioactive compounds from U. lactuca (9.55%) ( Table 1 ) diverges from the results obtained for the same genus harvested in similar Mediterranean waters, such as the methanolic extract of Ulva lactuca (formerly U. fasciata ) (15.0%) in Abu Qir Bay (Egypt) [ 30 ], while the methanolic extract of U. intestinalis harvested on the central Algerian coast (Bou Ismaïl Bay) demonstrates a comparable yield (10.55%) [ 26 ].…”

“…The red seaweed C. officinalis , collected from our northeastern Algerian coast, exhibited an extraction yield of bioactive compounds of 6.11%, slightly surpassing that of the methanolic extract of C. officinalis (4.3%) collected in Egypt (Abu Qir Bay) [ 30 ].…”

Chemical Composition of Macroalgae Polysaccharides from Galician and Portugal Coasts: Seasonal Variations and Biological Properties

“…macroalgae, similar behaviour only occurs in summer on the Portugal coast and no significant differences in MWD were observed in Galician. Such variation is expected since the biochemical and rheological profiles change with the harvesting period and are dependent on environmental parameters like light, temperature and salinity, as was described for different species and implies the biological activities [4,32,33].…”

“…macroalgae, similar behaviour only occurs in summer on the Portugal coast and no significant differences in MWD were observed in Galician. Such variation is expected since the biochemical and rheological profiles change with the harvesting period and are dependent on environmental parameters like light, temperature and salinity, as was described for different species and implies the biological activities [4,32,33]. The chromatogram for the PSs from Osmundea Codium species when eluted with 2.5 mM NaOH revealed that the most abundant fraction has a retention time of around 13 min (outside the column's calibration range) corresponding to PSs with a molecular weight probably significantly higher than 150 kDa.…”

“…macroalgae, similar behaviour only occurs in summer on the Portugal coast and no significant differences in MWD were observed in Galician. Such variation is expected since the biochemical and rheological profiles change with the harvesting period and are dependent on environmental parameters like light, temperature and salinity, as was described for different species and implies the biological activities [4,32,33]. Although the calibration curve cannot precisely estimate the mean molecular weight of the algae PS because one fraction of the PS exhibits a retention time lower than the standard with the highest molecular weight tested, the calibration curve was established for neutral PS (dextran), the algae PS are charged, and the relative molecular weight can be suggested (Table 1).…”