Antioxidant capacity and totals phenolics in different types of edible seaweed after three times of cooking
The aim of this study was to analyze the antioxidant activity measured by DPPH• and ORAC assays and total phenolic content (TPC) by the Folin-Ciocalteu method in the different species of algae (fresh and salted), and to evaluate the influence of cooking for 10, 20 and 30 minutes. The antioxidant activity and the total phenolic content revealed that Bifurcaria Bifurcata was the greatest seafood in these terms. The majority of the sea weeds showed higher antioxidant capacity previous to any cooking treatment, although salted Mastocarpus Stellatus and salted Ulva Lactuca reported some increases. The antioxidant activities were strongly correlated with TPC (R2= 0.999**, and R2= 0.996**, with p<0.01; for DPPH• and ORAC respectively), demonstrating that the phenolics of the different varieties of algae are directly involved in their bioactivity.
In recent years, the social interest in dietary antioxidants and bioactive compounds, mainly found in vegetables, has an increasing trend in population (1). In the search for feasible new sources of natural antioxidants that can be used in the food industry, algae have been suggested as possible raw material. This organism is widely known and consumed in certain countries, and numerous health benefits have been associated with its use (2). Over the past several decades, algae or their extracts have been studied as novel sources and some of them have been reported to possess biological activity of potential medicinal value (3, 4). Recently, much attention has been paid on the antioxidant and antiproliferative effects, and other bioactivities of different varieties of algae (5). Antioxidant activity is intensively focused due to the current interest of these compounds both as preservatives and protectors against oxidation in food and cosmetics and also due to their health implications, mainly in relation to their potential as functional ingredients.
Among all algae varieties, Laminaria ochroleuca, commonly named “Kombu”, is one of th ...