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Microbial Exopolysaccharides: From Genes to Applications

Authors: --- --- ---
Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889198436 Year: Pages: 161 DOI: 10.3389/978-2-88919-843-6 Language: English
Publisher: Frontiers Media SA
Subject: Microbiology --- Science (General)
Added to DOAB on : 2016-01-19 14:05:46
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Microbial polysaccharides represent an attractive alternative to those from plants or macro algae. They can be produced from renewable sources including lignocellulosic waste streams. Their production does not depend on geographical constraints and/or seasonal limitations. Additionally the manipulation of biosynthetic pathways to enhance productivity or to influence the chemi-cal polysaccharide composition is comparatively easy in bacteria. Microbial exopolysaccharides represents a valuable resource of biogenic and biodegradable polymers, suitable to replace petro based polymers in various technical applications. Furthermore, biocompatible exopolysaccha-rides are very attractive in medical applications, such as drug delivery systems, use as vaccines or nanoparticles. This research topic will depict the status quo, as well as the future needs in the field of EPS and biofilm research. Starting from the unexplored diversity of microbial polysaccharide producers to production processes and possibilities for modifications, to enhance the already high number of functionalities based on the chemical structures. An overview of the recent and future applications will be given, and the necessity in unravelling the biosynthesis of microbial exopolysaccharide producers is depicted, highlighting the future trend of tailor made polymers. Constraints in structure analysis of these highly complex biogenic polymers are described and different approaches to solve the restrictions in imaging and NMR analysis will be given. Therefore; this research topic comprises the whole process from genes to applications.

Renewable Polymers: Processing and Chemical Modifications

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ISBN: 9783039287666 / 9783039287673 Year: Pages: 206 DOI: 10.3390/books978-3-03928-767-3 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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The utilization of bio-resourced macromolecules for polymer applications has been the subject of increasing interest, mainly for sustainability and functionality reasons. This Special Issue of Processes brings together nine papers from leading scientists and researchers active in the area of “Sustainable and Renewable Polymers, Processing, and Chemical Modifications”. The collected papers include seven original research and two review articles related to renewable feedstock for polymer applications, processes for the fabrication of renewable polymer-based nanomaterials, the design and modification of renewable polymers, and applications of renewable polymers. The journal Processes will continue to nurture progress in this field through its position as an open access platform.

Carbohydrates 2018

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ISBN: 9783039283163 9783039283170 Year: Pages: 172 DOI: 10.3390/books978-3-03928-317-0 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General) --- Science (General)
Added to DOAB on : 2020-04-07 23:07:09
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This book contains original papers and reviews on carbohydrate research in medicine, authored by participants of the 29th International Carbohydrate Symposium, where this topic had a special emphasis. The focus on biological events involving carbohydrates and glycoconjugates has delivered reliable approaches for disease treatment and diagnosis. Research on carbohydrate-based compounds for therapeutic applications is illustrated in various contributions, namely those covering the development of novel agents against Alzheimer’s disease, e.g. the neuroprotective C-glucosylated flavones and the isonucleoside-based cholinesterase inhibitors. New imino sugar glucosidase inhibitors are also disclosed, a class of compounds with potential for diabetes, Gaucher disease or cancer treatment. Also the development of a useful synthetic method towards multivalent glycoclusters of biomedical interest is here highlighted. The relevance of glycomimetics in drug discovery and the progress on carbohydrates in early diagnosis and cancer treatment are reviewed. Noteworthy is the chitosan-based delivery system for drug oral administration, a new biomaterial-based approach to improve bioavailability. Another study on the conformation of Streptococcus capsular polysaccharide backbones by molecular modelling provides useful information for bacterial immunotherapeutic approaches. All original contributions and reviews clearly demonstrate the potential of glycosciences for innovation in medicinal (glyco)chemistry and pharmaceutical research.

Marine Glycoconjugates: Trends and Perspectives

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ISBN: 9783039285587 / 9783039285594 Year: Pages: 272 DOI: 10.3390/books978-3-03928-559-4 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Biology --- Biochemistry
Added to DOAB on : 2020-06-09 16:38:57
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The books described marine glycoconjugates. Two articles concern microalgal metabolites such as steroid and sphingoid glycoconjugates, and a glycoprotein from a sea cucumber with interesting biological activities, respectively. One article discusses the fatty acid composition and thermotropic behavior of glycolipids and other membrane lipids of green macrophyte Ulva lactuca. Three articles cover lectin subjects. One review article analyzes perspectives of marine and freshwater lectins’ application in experimental oncology and the therapy of oncological diseases; another article describes the use of a sponge lectin in the construction of a recombinant virus. The third article concerns the function of the immunity of a lectin in producing this compound crinoid. Two articles concern steroid glycosides from star?sh, and two others concern triterpene glycosides from sea cucumbers. One article describes the e?ect of a glycosaminoglycan from the sea cucumber Apostichopus japonicus on hyperglycemia in the liver of insulin-resistant mice. One article concerns the isolation of 10 new triterpene glycosides from a fungus associated with a sea cucumber. The article by Dworaczek et al. characterizes the O-speci?c polysaccharide (O-antigen) of a bacterial pathogen of common carp by chemical and immunochemical methods. In total, the Special Issue comprises14 articles, including the editorial and two reviews.

Keywords

starfish --- Anthenea aspera --- steroidal glycosides --- colony formation --- apoptosis --- Bcl-2 proteins --- glycolipids --- phospholipids --- betaine lipid --- fatty acids --- differential scanning calorimetry --- thermal adaptation --- glycoprotein --- mitophagy --- marine antiproliferative compounds --- Alexandrium minutum --- microalgae --- sterol glycoconjugates --- glycosylceramides --- structures --- biological activities --- functions --- N-Acetyllactosamine (LacNAc) --- Anneissia japonica --- anti-biofilm activity --- cell adhesion --- crinoid --- Echinoderm --- feather star --- lectin --- signal transduction --- sghC1qDC --- Psolus fabricii --- triterpene glycosides --- psolusosides --- sea cucumber --- cytotoxic activity --- Aphrocallistes vastus lectin --- oncolytic vaccinia virus --- ERK --- Aeromonas --- fish pathogen --- lipopolysaccharide (LPS) --- structure --- O-antigen --- O-polysaccharide --- l-perosamine --- immunospecificity --- NMR spectroscopy --- mass spectrometry --- starfish --- Lethasterias fusca --- asterosaponins --- polyhydroxysteroids --- glycosides --- body components --- distribution --- Acremonium striatisporum --- secondary metabolites --- marine fungi --- diterpene glycosides --- urease activity --- Psolus fabricii --- triterpene glycosides --- psolusosides --- sea cucumber --- cytotoxic activity --- glycosaminoglycan --- Apostichopus japonicus --- glucose metabolism --- Akt --- AMPK --- marine lectins --- cancer --- cancer therapy --- in vitro studies --- in vivo studies --- natural products --- n/a

Polymer Clay Nano-composites

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ISBN: 9783039216529 9783039216536 Year: Pages: 246 DOI: 10.3390/books978-3-03921-653-6 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Biology
Added to DOAB on : 2019-12-09 11:49:16
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This Special Issue focuses on the current state-of-the-art of “Polymer Clay Nano-Composites” for biomedical, anticorrosion, antibacterial, and other applications. Clay–polymer composite nanomaterials represent an emerging area of research. Loading polymers with clay particles essentially enhances the composite strength features. Of particular interest are different nano-assembly methods, such as silane mono and multilayers, polyelectrolyte layer-by-layer assembly, and others. An important development was reached for tubular and fibrous clay nanoparticles, such as halloysite, sepiolite, and imogolite. Polymer clay nanoparticles can be prepared as sheets with 1-nm thickness and width of a few hundred nm (e.g., kaolin and montmorillonite). Fibrous clays significantly reinforce the nano-composites in the assembly with biopolymers and other green polymers, leading to functional hybrid bio nano-composites. The scope of this Special Issue comprehensively includes the synthesis and characterization of polymer clay nano-composites used for several applications, including nano-clay polymer composites and hybrid nano-assemblies.

Keywords

polyimide --- graphene oxide --- composite --- mechanical properties --- indentation recovery --- AFM --- carbon fibers --- surface grafting --- halloysite nanotubes --- polymer composites --- interface --- fish gelatin --- halloysite nanotubes --- glycerol --- mechanical properties --- water resistance --- LAP --- hyaluronic acid --- doxorubicin --- CD44 receptor targeted --- sacrificial bond --- ionic network --- organic montmorillonite --- 1,2-polybutadiene --- in-situ intercalation --- clay–polymer nanocomposites --- atrazine --- radical polymerization --- hexadecyltrimethylammonium bromide --- phenyltrimethylammonium chloride --- FTIR --- TGA --- adsorption --- dental resins --- nanocomposite materials --- organically modified clays --- montmorillonite --- intercalation --- nanotechnology --- ammonium persulfate --- fuzzy optimization --- N,N?-methylenebisacrylamide --- Pareto set --- polyacrylic acid --- swelling capacity --- variable cost --- polyethylene oxide --- montmorillonite clays --- Pd catalysis --- catalytic composite --- positron annihilation --- doubly functionalized montmorillonite --- polystyrene --- soap-free emulsion polymerization --- thermal stability --- tribological property --- organo-clays --- polyamines --- clay-amine interaction mechanisms --- structure effects --- la uptake and release --- layered silicate --- sericite --- CTAB --- intercalation stability --- nanocomposites --- gelation kinetics --- sol–gel transition --- water shutoff --- silica sol --- cellulose nanofibrils --- halloysite nanotubes --- supercritical CO2 --- polystyrene foam --- blowing agent --- in situ polymerization --- attapulgite/polypyrrole nanocomposite --- halloysite nanotubes --- polysaccharide --- interfacial interactions --- reinforcing --- adsorption --- dispersion --- coatings --- whey protein isolate --- nanocomposites --- nanoclay, barrier --- morphology --- n/a

Marine Chitin 2019

Authors: ---
ISBN: 9783039360727 / 9783039360734 Year: Pages: 288 DOI: 10.3390/books978-3-03936-073-4 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Medicine (General) --- Therapeutics
Added to DOAB on : 2020-06-09 16:38:57
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Abstract

In 2019, we sent out a call for submissions to a Special Issue of Marine Drugs entitled “Marine Chitin 2019”, and we are pleased that this issue has now been published. Over 16 high-impact papers were included in this issue, which we now plan to publish as a book. In addition, we now seek to publish a further Special Issue of Marine Drugs, “Marine Chitin 2020–2021”. As before, we plan to produce an authoritative and exciting issue that will encompass breakthroughs in scientific and industrial chitin and chitosan research. Significant advances in chitin and chitosan research have been made since the 1970s, and current overviews in recent publications involving chitin and chitosan research advances are in need of an update.

Keywords

chitosan --- cytotoxicity --- polymer film --- sodium carbonate --- soluble chitosan complex --- chitin --- chitosan --- protease --- chitinase --- chitosan oligomers --- chitooligosaccharides --- anti-inflammatory action --- RAW264.7 macrophage --- chitosan oleate salt --- amphiphilic polymer --- PLGA --- nanoparticles --- mucoadhesion --- Caco-2 cell culture --- nile red --- curcumin --- chitooligosaccharide --- immunostimulatory activity --- RAW 264.7 cells --- mitogen-activated protein kinases (MAPK) --- phosphoinositide 3-kinases (PI3K)/Akt --- chitosan oligosaccharides --- streptomycin --- Pseudomonas aeruginosa --- biofilms --- conjugation --- chitin --- marine sponges --- scaffolds --- Aplysina archeri --- express method --- bromotyrosines --- crude oil --- blood --- methylene blue --- chitin --- chitosan --- Paenibacillus --- chitosanase --- chitosan oligomers --- ?-glucosidase inhibitor --- antioxidant --- Polybius henslowii --- marine resources --- chitosan --- chitooligosaccharides --- antifungal activity --- antioxidant activity --- chitin --- collagen --- electrospinning --- mechanical property --- 2D correlation spectroscopy --- polymorph --- chitosan lactate --- chitosan tartrate --- chitosan citrate --- Eudragit® S100 --- layer-by-layer film --- mucoadhesive film --- Tenofovir controlled release --- pH responsive release --- vaginal preexposure prophylaxis --- HIV sexual transmission --- chitin --- chitosan --- wound treatment --- derivatization --- nanocomposites --- chitosan --- antibacterial activity --- Clostridium perfringens --- pork sausage --- chitin --- chitosan --- chitooligosaccharides --- enzymatic modification --- biotechnology --- chitinase --- chitosanase --- lytic polysaccharide monooxygenase --- chitin deacetylase --- chitosan-coated liposomes --- chitosan hydrogel --- mucoadhesion --- vaginal infections --- antibacterial activity --- Staphylococcus epidermidis --- Staphylococcus aureus --- chitin --- roller compaction --- ball milling --- direct compression --- compression work --- crushing strength --- Hausner ratio --- Kawakita analysis --- bulk density --- dissolution

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