The seasonal variations in the total phenolic contents and potential antioxidant activities of three seaweed species (Halopteris scoparia, Zonaria tournefortii, Sphaerococcus coronopifolius) were assessed. The highest total phenolic content was recorded during autumn in the seaweeds S. coronopifolius (144.33 1.76 mg GAE/100g) and H. scoparia (105.40 1.19 mg GAE/100g). The highest ascorbic acid content was observed in H. scoparia (125.52 2.79 mg AAE/100g) in spring. The total antioxidant activity (699.13 2.23 mg GAE /100g) and the ferric reducing power (54.69 0.75 mg GAE/100g) were found to be high in S. coronopifolius during spring and autumn respectively, whereas the ferrous iron chelation in H. scoparia during the three seasons (varied from 321.66 8.82 to 340.05 1.81 mg GAE/100g). The DPPH radical scavenging activity (12.08 0.28 mg GAE/100g) was found to be high in Z. tournefortii during summer.
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Fellah et al. (2017) studied this question.