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Synthesis and Applications of Biopolymer Composites

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ISBN: 9783039211326 9783039211333 Year: Pages: 312 DOI: 10.3390/books978-3-03921-133-3 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- Chemical Engineering
Added to DOAB on : 2019-08-28 11:21:27
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Abstract

This book, as a collection of 17 research articles, provides a selection of the most recent advances in the synthesis, characterization, and applications of environmentally friendly and biodegradable biopolymer composites and nanocomposites. Recently, the demand has been growing for a clean and pollution-free environment and an evident target regarding the minimization of fossil fuel usage. Therefore, much attention has been focused on research to replace petroleum-based commodity plastics by biodegradable materials arising from biological and renewable resources. Biopolymers—polymers produced from natural sources either chemically from a biological material or biosynthesized by living organisms—are suitable alternatives for addressing these issues due to their outstanding properties, including good barrier performance, biodegradation ability, and low weight. However, they generally possess poor mechanical properties, a short fatigue life, low chemical resistance, poor long-term durability, and limited processing capability. In order to overcome these deficiencies, biopolymers can be reinforced with fillers or nanofillers (with at least one of their dimensions in the nanometer range). Bionanocomposites are advantageous for a wide range of applications, such as in medicine, pharmaceutics, cosmetics, food packaging, agriculture, forestry, electronics, transport, construction, and many more.

Keywords

nanocellulose --- protease sensor --- human neutrophil elastase --- peptide-cellulose conformation --- aerogel --- glycol chitosan --- ?-tocopherol succinate --- amphiphilic polymer --- micelles --- paclitaxel --- chitosan --- PVA --- nanofibers --- electrospinning --- nanocellulose --- carbon nanotubes --- nanocomposite --- conductivity --- surfactant --- Poly(propylene carbonate) --- thermoplastic polyurethane --- compatibility --- toughness --- biopolyester --- compatibilizer --- cellulose --- elastomer --- toughening --- biodisintegration --- heat deflection temperature --- biopolymers composites --- MgO whiskers --- PLLA --- in vitro degradation --- natural rubber --- plasticized starch --- polyfunctional monomers --- physical and mechanical properties --- cross-link density --- water uptake --- chitosan --- deoxycholic acid --- folic acid --- amphiphilic polymer --- micelles --- paclitaxel --- silk fibroin --- glass transition --- DMA --- FTIR --- stress-strain --- active packaging materials --- alginate films --- antimicrobial agents --- antioxidant activity --- biodegradable films --- essential oils --- polycarbonate --- thermal decomposition kinetics --- TG/FTIR --- Py-GC/MS --- wheat gluten --- potato protein --- chemical pre-treatment --- structural profile --- tensile properties --- biocomposites --- natural fibers --- poly(3-hydroxybutyrate-3-hydroxyvalerate) --- biodegradation --- impact properties --- chitin nanofibrils --- poly(lactic acid) --- nanocomposites --- bio-based polymers --- natural fibers --- biomass --- biocomposites --- fiber/matrix adhesion --- bio-composites --- mechanical properties --- poly(lactic acid) --- cellulose fibers --- n/a

Curcumin in Health and Disease

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ISBN: 9783039214495 9783039214501 Year: Pages: 274 DOI: 10.3390/books978-3-03921-450-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General)
Added to DOAB on : 2019-12-09 11:49:15
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The plant-derived polyphenol curcumin has been used in promoting health and combating disease for thousands of years. Its therapeutic effects have been successfully utilized in Ayurvedic and Traditional Chinese Medicine in order to treat inflammatory diseases. Current results from modern biomolecular research reveal the modulatory effects of curcumin on a variety of signal transduction pathways associated with inflammation and cancer. In this context, curcumin’s antioxidant, anti-inflammatory, anti-tumorigenic, and even anti-metastatic activities are discussed. On the cellular level, the reduced activity of several transcription factors (such as NFkB or AP-1) and the suppression of inflammatory cytokines, matrix degrading enzymes, metastasis related genes and even microRNAs are reported. On functional levels, these molecular effects translate into reduced proliferative, invasive, and metastatic capacity, as well as induced tumor cell apoptosis. All these effects have been observed not only in vitro but also in animal models. In combination with anti-neoplastic drugs like Taxol, kinase inhibitors, and radiation therapy, curcumin potentiates the drugs’ therapeutic power and can protect against undesired side effects. Natural plant-derived compounds like curcumin have one significant advantage: They do not usually cause side effects. This feature qualifies curcumin for primary prevention in healthy persons with a predisposition to cancer, arteriosclerosis, or chronic inflammatory diseases. Nonetheless, curcumin is considered safe, although potential toxic effects stemming from high dosages, long-term intake, and pharmacological interactions with other compounds have yet to be assessed. This Special Issue examines in detail and updates current research on the molecular targets, protective effects, and modes of action of natural plant-derived compounds and their roles in the prevention and treatment of human diseases.

Keywords

brain ischemia --- curcumin --- Alzheimer’s disease --- neurodegeneration --- amyloid --- tau protein --- autophagy --- mitophagy --- apoptosis --- genes --- glioblastoma multiforme --- autophagy --- mitophagy --- curcumin --- chaperone-mediated autophagy --- Akt/mTOR signaling --- transmission electron microscopy --- Curcuma longa --- turmeric tuber --- Zingiberaceae --- TLC bioautography --- antimicrobial agents --- ImageJ --- TLC-MS --- hydrostatic counter-current chromatography --- centrifugal partition chromatography --- curcumin --- death receptor --- apoptosis --- curcumin --- anticancer --- structure activity relationship --- cellular pathway --- mechanism of action --- delivery system --- wound --- wound healing --- diet --- nutrition --- micronutrients --- macronutrients --- curcumin --- amino-acids --- vitamins --- minerals --- curcumin --- oxidative metabolites --- inflamm-aging --- cancer --- metabolic reprogramming --- direct protein binding --- IL-17 --- STAT3 --- SHMT2 --- ageing --- anti-cancer --- autophagy --- microbiota --- senescence --- senolytics --- curcumin --- transthyretin --- amyloidosis --- protein aggregation --- protein misfolding --- drug discovery --- curcumin --- renal cell cancer --- tumor growth --- tumor proliferation --- cell cycling --- curcumin --- reflux esophagitis --- gastroprotection --- gastric ulcer --- Helicobacter pylori --- gastric cancer --- curcumin --- complementary medicine --- cancer treatment --- supportive care --- antioxidants --- anti-inflamation --- ulcerative colitis --- Crohn’s disease --- necrotizing enterocolitis --- curcumin --- inflammatory bowel disease --- curcumin --- silica --- chitosan --- nanoparticles --- anti-tumor --- antioxidant activity --- n/a

Metal Organic Frameworks: Synthesis and Application

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ISBN: 9783039284863 9783039284870 Year: Pages: 198 DOI: 10.3390/books978-3-03928-487-0 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General) --- Inorganic Chemistry
Added to DOAB on : 2020-04-07 23:07:09
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Metal–organic frameworks are among the most promising novel materials. The concept of MOFs was first introduced in 1990. They were actually initially used in catalysis, gas separation, membranes, electrochemical sensors. Later on, they were introduced as SPE sorbents for PAHs (Polycyclic Aromatic Hydrocarbons) in environmental water samples, then the range expanded to the field of analytical chemistry, both in chromatographic separation and sample preparation, with great success in, e.g., SPE and SPME (Solid Phase Mico-extraction). Since then, the number of analytical applications implementing MOFs as sorbents in sorptive sample preparation approaches is increasing. ?his is reinforced by the fact that, at least theoretically, an infinite number of structures can be designed and synthesized, thus making tuneability one of the most unique characteristics of MOF materials. Moreover, they have been designed in various shapes, such as columns, fibers, and films, so that they can meet more analytical challenges with improved analytical features.Their exceptional properties attracted the interest of analytical chemists who have taken advantage of the unique structures and properties and have already introduced them in several sample pretreatment techniques, such as solid phase extraction, dispersive SPE, magnetic solid phase extraction, solid phase microextraction, stir bar sorptive extraction, etc.

Natural Products and Drug Discovery

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ISBN: 9783039287468 / 9783039287475 Year: Pages: 392 DOI: 10.3390/books978-3-03928-747-5 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Biology
Added to DOAB on : 2020-06-09 16:38:57
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Natural products hold a prominent position in the current discovery and development of drugs and have diverse indications for both human and animal health. Plants, in particular, play a leading role as a source of specialized metabolites with medical effects. Other organisms, such as marine and terrestrial animals and microorganisms, produce very important drug candidate molecules. Specialized metabolites from these varied natural sources can be used directly as bioactive compounds or drug precursors. In addition, due to their broad chemical diversity, they can act as drug prototypes and/or be used as pharmacological tools for different targets. Some examples of natural metabolites that have been developed into useful medical drug are cardiotonic digoxin from Digitalis sp., antimalarial artemisinin from Artemisia annua, anti-cancer taxol from Taxus sp., or podophyllotoxin from Podophyllum peltatum, which served as a synthetic model for the anti-cancer etoposide. The study of natural products is still attracting great scientific attention and their current importance, as a valuable lead for drug discovery, is undebatable. I cordially invite authors to contribute original articles, as well as survey articles, that give the readers of Molecules **MOLECULES NEEDS TO BE ITALICIZED** updated and new perspectives on natural products in drug discovery, including but not limited to natural sources, identification and separation of bioactive phytochemicals, standardization, new biological targets, pre-clinical and clinical trials, pharmacological effects/side effects, and bioassays.

Keywords

cytotoxicity-guided --- phenolic derivatives --- Dryopteris fragrans --- chemical derivatization --- immuno-regulation activity --- Imperata cylindrica --- HPLC --- ESI-MS/MS --- growth inhibitory activity --- cancer --- cardamonin --- antinociceptive --- TRPV1 --- glutamate --- opioid --- siphonous green algae --- sulfated coumarins --- Dasycladus vermicularis --- isolation and quantification --- Orobanche s.l. --- Orobanchaceae --- Lamiales --- natural products --- secondary metabolites --- phenylpropanoid glycosides --- phenylethanoid glycosides --- bioactivities of natural products --- chemosystematics --- FSE --- T2DM --- GLUT4 --- Ca2+ --- L6 cell --- marine peptides --- proliferation --- migration --- angiogenesis --- zebrafish --- antioxidant activity --- flavonoids --- isoflavones --- phenolics --- proanthocyanidins --- Trifolium --- Leea indica --- HPLC-ESI-microTOF-Q-MS/MS --- phenolics --- dihydrochalcones --- Humulus lupulus --- prenylated phenolic compounds --- antimicrobial agents --- methicillin-resistant Staphylococcus aureus --- Leishmania mexicana mexicana --- Trypanosoma brucei brucei --- Astragalus boeticus L. --- spectroscopic analysis --- cytotoxic activity --- human colon cancer cell lines --- acetylated astragalosides --- Fabaceae --- aging --- cancer --- cardiovascular disease --- dementia --- diabetes --- inflammation --- oxidative stress --- Harpagophytum procumbens --- devil’s claw --- harpagoside --- spagyric tincture --- antioxidant activity --- Cleistocalyx operculatus --- 2?,4?-dihydroxy-6?-methoxy-3?,5?-dimethylchalcone (DMC) --- pPancreatic cancer --- PANC-1 --- ACE inhibitory peptide --- antihypertensive --- bioactive peptides --- hypertension --- marine resources --- terpenes --- terpenoids --- antimicrobial resistance --- synergy --- Phyllanthus orbicularis --- C-glycoside --- flavonoid --- natural products --- traditional medicine --- Cuba --- Phyllanthus chamacristoides --- chromatography --- mass spectrometry --- NMR --- circular dichroism --- stereochemistry --- Fideloside --- cytokines --- anti-inflammatory activity --- metabolomics --- multivariate data analysis --- molecular network --- Bacopa monnieri --- LC-MS --- diabetic neuropathy --- neuropathic pain --- glucosinolates --- Eruca sativa --- glucoerucin --- H2S --- Kv7 potassium channels --- artemisinin --- Physcomitrella patens --- sesquiterpenoids --- malaria --- biotechnology --- ketamine --- psychosis --- cerebellum --- celastrol --- oxidative stress --- NADPH oxidases --- n/a

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