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The field of marine polysaccharides is constantly evolving, due to progress in the discovery and production of new marine polysaccharides. Seaweed remains the most abundant source of polysaccharides, but recent advances in biotechnology have allowed the production of large quantities of polysaccharides from a variety of micro-algae, by controlling growth conditions and tailoring the production of bioactive compounds in a bioreactor. Of particular interest are polysaccharides produced by micro-organisms from extreme marine environments, due to their recognized different biochemistry. Extracellular polysaccharides (EPSs) with unique properties produced by a number of micro-algae are known. The first volume is a collection of papers concerning the identification and characterization of novel marine polysaccharides. It is divided into three chapters; the first two are dedicated to polysaccharides from different marine sources (algae, micro-algae, animals), while the third one gathers information on the isolation, characterization and bioactivity of new EPSs.

Polysaccharides --- Agar. --- Drug delivery systems. --- Biotechnology. --- Delivery systems, Drug --- Drug administration technology --- Drug delivery technology --- Drugs --- Pharmaceutical technology --- Agar-agar --- Algae products --- Galactans --- Sulfates --- Delivery systems

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The marine environment is considered one of the most important sources of natural bioactive compounds with extremely rich biodiversity. Marine glycans are remarkable molecules, playing a determinant role in biological processes. Marine сarbohydrate-containing substances have drawn increasing attention in the field of biomedicine for their various biological activities, such as antitumor, antivirus, hypoglycemic, immunomodulatory, and anticoagulant. These compounds obtained from marine sources, such as algae, microbes, and animals, are usually biodegradable and biocompatible, and exhibit biological properties that contribute to the discovery of a wide range of new bioactive substances with special pharmacological properties of interest to medicine. Carbohydrate-based compounds include glycans, glycoproteins, proteoglycans, glycolipids, and low-molecular and complex glycosides of differential origin. Many of the polysaccharides allow for loading lower drug dosages, which may lead to a drastic reduction of the side effects caused by the drugs. In addition, the structure of polysaccharides can be relatively easily modified in order to synthesize derivatives with desirable characteristics for drug delivery. Complexes on the basis of carbohydrates are often prepared to improve their functional properties. In this Special Issue, we seek to contribute to the discussion of various aspects of marine carbohydrate-containing compounds and provide a unique platform for a new concept for their use in medicine in order to continue to facilitate further research in this area.

Medicine --- chitosan-gentamicin conjugate --- antimicrobial --- anti-inflammatory --- scald repair --- sulfated polysaccharides --- galactans --- green seaweed --- NMR --- immunostimulation --- inflammatory mediators --- carrageenan --- lipopolysaccharide --- macromolecular structure --- nonspecific resistance to lipopolysaccharide --- cytokines --- enteric infections --- salmonellosis --- glyceroglycolipid metabolism --- phosphate starvation --- transcriptome --- glyceroglycolipid homeostasis --- chitosan --- polyelectrolyte complex --- cytokine --- nitric oxide --- anti-inflammatory activity --- Ulva pertusa --- polysaccharides --- colitis --- antioxidant --- exopolysaccharide --- structure --- Vibrio alginolyticus --- Epidermist --- chitosan oligosaccharides --- inflammation cytokines --- intestine --- oxidative status --- oxidative stress --- Porphyridium marinum --- high pressure homogenizer --- antibacterial activity --- anti-biofilm activity --- anti-cancer activity --- alginate lyase --- cold-adapted --- exo/endo-type --- Alteromonas portus --- oligosaccharide --- antioxidant activity --- exopolysaccharides --- scandium --- theranostic --- cancer cell lines --- proliferation --- laminarin --- fucoidan --- gastrointestinal tract --- microbiome --- swine --- post-weaning --- antibiotic alternatives