Natural Polymers with Antioxidant Properties: Poly‐/oligosaccharides of Marine Origin

Jiao, Guangling; Yu, Guangli; Zhao, Xiaoliang; Zhang, Junzeng; Ewart, H. Stephen

doi:10.1002/9781118445440.ch8

Cited by 3 publications

(2 citation statements)

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“…Efficient antioxidants typically have high redox potential that allows them to act as reducing agents, hydrogen donors, or singlet oxygen quenchers. There are many techniques for evaluating the antioxidant activity, including free radical scavenging, oxygen scavenging, singlet oxygen quenching, metal chelation and inhibition of oxidative enzymes [ 37 ]. Overall, in vitro antioxidant tests using free radical traps are relatively straightforward to perform.…”

Section: Brief Overview Of the Methods Employed For The Evaluation Of Antioxidant Activitymentioning

confidence: 99%

Metabolites with Antioxidant Activity from Marine Macroalgae

et al. 2021

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Reactive oxygen species (ROS) attack biological molecules, such as lipids, proteins, enzymes, DNA, and RNA, causing cellular and tissue damage. Hence, the disturbance of cellular antioxidant homeostasis can lead to oxidative stress and the onset of a plethora of diseases. Macroalgae, growing in stressful conditions under intense exposure to UV radiation, have developed protective mechanisms and have been recognized as an important source of secondary metabolites and macromolecules with antioxidant activity. In parallel, the fact that many algae can be cultivated in coastal areas ensures the provision of sufficient quantities of fine chemicals and biopolymers for commercial utilization, rendering them a viable source of antioxidants. This review focuses on the progress made concerning the discovery of antioxidant compounds derived from marine macroalgae, covering the literature up to December 2020. The present report presents the antioxidant potential and biogenetic origin of 301 macroalgal metabolites, categorized according to their chemical classes, highlighting the mechanisms of antioxidative action when known.

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Section: Brief Overview Of the Methods Employed For The Evaluation Of Antioxidant Activitymentioning

confidence: 99%

Metabolites with Antioxidant Activity from Marine Macroalgae

et al. 2021

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“…This highlights the importance of bacterial epibionts both in algal evolution and as a source of interesting bioactive compounds (Meslet-Cladiere et al, 2013). Lastly, algal-polysaccharide-degrading enzymes have a wide range of medical and pharmaceutical applications because they produce remarkable biologically active oligosaccharides with properties useful in maintaining human health, such as anticoagulant (Pereira et al 1999;Pushpamali et al 2008), anti-inflammatory (Berteau and Mulloy 2003), antioxidant Jiao et al 2012), or immunostimulating activity (Bhattacharyya et al 2010). Furthermore, oligosaccharides derived from ulvans, agars, carrageenans, alginates, and other less known algal polysaccharides are explored for their potential use as prebiotics favoring gut health in humans and animals (O'Sullivan et al 2010).…”

Section: Medical and Pharmaceutical Applicationsmentioning

confidence: 99%

Microorganisms living on macroalgae: diversity, interactions, and biotechnological applications

Martin

Portetelle

Michel

et al. 2014

Appl Microbiol Biotechnol

140

107

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Marine microorganisms play key roles in every marine ecological process, hence the growing interest in studying their populations and functions. Microbial communities on algae remain underexplored, however, despite their huge biodiversity and the fact that they differ markedly from those living freely in seawater. The study of this microbiota and of its relationships with algal hosts should provide crucial information for ecological investigations on algae and aquatic ecosystems. Furthermore, because these microorganisms interact with algae in multiple, complex ways, they constitute an interesting source of novel bioactive compounds with biotechnological potential, such as dehalogenases, antimicrobials and alga-specific polysaccharidases (e.g. agarases, carrageenases, alginate lyases). Here, to demonstrate the huge potential of alga-associated organisms and their metabolites in developing future biotechnological applications, we first describe the immense diversity and density of these microbial biofilms. We further describe their complex interactions with algae, leading to the production of specific bioactive compounds and hydrolytic enzymes of biotechnological interest.We end with a glance at their potential use in medical and industrial applications.

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