Influence of biological, environmental and technical factors on phenolic content and antioxidant activities of Tunisian halophytes

Abstract

Halophyte ability to withstand salt-triggered oxidative stress is governed by multiple biochemical mechanisms that facilitate retention and/or acquisition of water, protect chloroplast functioning, and maintain ion homeostasis. Most essential traits include the synthesis of osmolytes, specific proteins, and antioxidant molecules. This might explain the utilization of some halophytes as traditional medicinal and dietary plants. The present study aimed at assessing the phenolic content and antioxidant activities of some Tunisian halophytes (Cakile maritima, Limoniastrum monopetalum, Mesembryanthemum crystallinum, M. edule, Salsola kali, and Tamarix gallica), depending on biological (species, organ and developmental stage), environmental, and technical (extraction solvent) factors. The total polyphenol contents and antioxidant activities (DPPH and superoxide radicals scavenging activities, and iron chelating and reducing powers) were strongly affected by the above-cited factors. Such variability might be of great importance in terms of valorising these halophytes as a source of naturally secondary metabolites, and the methods for phenolic and antioxidant production.

Anticancer and Antioxidant Activities of Some Algae from Western Libyan Coast

“…Reducing capacity is considered as a significant additional indicator of potential antioxidant activity of a compound or sample [36]. Figure 1 shows the concentration-response curves for the reducing power of the algal extracts under investigation.…”

Comparison of Infusions from Black and Green Teas (Camellia sinensis L. Kuntze) and Erva-mate (Ilex paraguariensis A. St.-Hil.) Based on the Content of Essential Elements, Secondary Metabolites, and Antioxidant Activity

“…These concentrations are slightly lower than those obtained in this study. The differences in phenolic composition could be dependent on biological and environmental factors (Ksouri et al 2008). Besides, there are different reports of major compound changes in green tea depending on the leaf age (Lee et al 2014).…”

Phenolic acids in Crithmum maritimum L. (Apiaceae) after Tytanit fertilization

“…As expressed by many authors [58,59], composition of the phenolics, and among them also phenolic acids, depends on both environmental conditions (temperature, humidity, exposure to light) and biological influences (e.g., insects and herbivores) [60]. Tytanit and its active component, Ti 4+ ions, were investigated previously, and their effect on biomass production and condition of plants was confirmed [42,[46][47][48].…”