Carbohydrate polymers

Ebook "Bio-synthetic polymer conjugates" is comprised of five chapters summarizing the state of the art in the synthesis of bioorganic–synthetic polymer conjugates based on oligo- and polypeptides, proteins, carbohydrates, nucleotides, and terpenes. The main focus is on synthesis, whereas special materials properties and potential applications are not discussed in great detail.

202p coduathanh1122 27-03-2024 2 1   Download

In ebook "Carbohydrates in sustainable development II: A mine for functional molecules and materials (Topics in current chemistry, Volume 295)" a survey on the state of the art of ionic liquids derived from sugars is also presented. Synthetic polymers can now be made based on carbohydrate building blocks. The potential of these biocompatible and biodegradable macromolecular materials to replace the polluting petroleum-based polymers is also discussed.

211p manmanthanhla0201 26-02-2024 6 1   Download

Part 2 book "Safety-scale laboratory experiments for chemistry for today general, organic, and biochemistry" includes content: Reactions of aldehydes and ketones; reactions of carboxylic acids, amines, and amides; the synthesis of aspirin and other esters; identifying functional groups in unknowns; synthetic polymers; dyes, inks, and food colorings; a study of carbohydrates; preparation of soap by lipid saponification; isolation of natural products - trimyristin and cholesterol; amino acids and proteins;... and other contents.

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Foot ulcers, a common complication of diabetes, can cause physical incapacity and are derived from several factors, including poor wound healing. New therapeutic strategies are needed to minimize this complication for the sake of patients’ health.

10p vicedric 08-02-2023 6 1   Download

The capsular material from Lactobacillus plantarum IMB19, an isolate from fermented vegetables, has been analyzed and our results demonstrate that most of the coat of this bacterium consists of glycerol- and ribitol-type teichoic acids, further decorated with other substituents (α-glucose and alanine), and of a capsular polysaccharide (CPS) with a linear nonasaccharide repeating unit, rich in rhamnose, interconnected to the next via a phosphodiester bridge.

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In this study, a strategy was adopted to enhance the use of ramie fibers as raw material for isolation of cellulose nanofibers (CNFs). Ramie pulp was produced by alkaline organosolv followed by bleaching. CNFs were produced by mechanical defibrillation, and films were fabricated via casting.

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Microcrystalline cellulose (MCC) can be a reinforcement in composites, especially after surface modification. In this paper, MCC was modified using 3-aminopropyltriethoxysilane (APTES) in the following ratios (MCC/ APTES): 1:3, 1:4, 1:5, 1:10).

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The cellulose film impregnated with MnO2 nanoparticles was capable of efficiently discolouring an Indigo Carmine dye solution in 25 min upon ambient light. The film was easily removed from the dye solution and repeatedly reused for at least 10 times without losing its discolouring efficiency.

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The cell wall polysaccharide ulvan was isolated from two species of the seaweed Ulva collected along the Swedish west coast. Acidic extraction was benchmarked against hot water extraction with enzymatic purification and against commercial ulvan.

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Starch is an important class of macromolecules for human nutrition. However, its rapid digestibility leads to a high amount of glucose released into the blood and contributes to a high risk of obesity and type II diabetes.

8p vihermione 06-01-2023 10 3   Download

The high-, medium-, and low-amylose rice starches were isolated by the alkaline method and acetylated by using acetic anhydride for 10, 30, and 90 min of reaction. The degree of substitution (DS), the Fourier-transformed infrared spectroscopy (FTIR), the X-ray diffractograms, the thermal, morphological, and pasting properties, and the swelling power and solubility of native and acetylated starches were evaluated.

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Chitosan-sheath and -chitin-core nanowhiskers (CsNWs) have been successfully generated by surface deacetylation of chitin nanowhiskers (CtNWs) in the never-dried state. Acid hydrolysis (3N HCl, 30 mL/g, 104 ◦C) of pure chitin derived from crab shell yielded 65% 4–10 nm thick, 16 nm wide and 214 nm long chitin whiskers (CtNWs) that were 86% crystalline and 81% acetylated.

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This study aimed to evaluate reaction conditions for deposition of SiO2 nanoparticles on the surface of cellulose fibers and their influence on moisture adsorption of the hybrid organic–inorganic material formed.

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The aim of this study was to develop hepatocyte-targeting non-viral polymeric nono-carriers for gene delivery. Chitosan was selected as the main polymer. An asialoglycoprotein receptor recognized sugar, galactose, was introduced.

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Superficially similar carbohydrate polymers from similar sources can have dramatically different characteristics. This work seeks to examine the molecular properties responsible for these differences.

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The synthesis of vinyl-based oligocelluloses using cellodextrin phosphorylase as biocatalyst in buffer solution is presented. Crystal lattice of the prepared vinyl-based oligocelluloses was investigated via wide-angle X-ray diffraction experiments.

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In the present study, we report a simple route for synthesizing silver nanoparticles (AgNPs) in the presence of a nanostructured polysaccharide (cellulose nanowhiskers) to produce a hybrid material, which was employed as a colorimetric probe for H2O2 detection.

7p vihermione 06-01-2023 9 2   Download

The aerial parts of Artemisia absinthium and Artemisia vulgaris are used in infusions for the treatment of several diseases. Besides secondary metabolites, carbohydrates are also extracted with hot water and are present in the infusions. The plant carbohydrates exhibit several of therapeutic properties and their biological functions are related to chemical structure.

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Considering the importance of maize starch and the lack of knowledge about the effects of storage temperature on the isolated starch properties; maize grains were stored during 12 months at different temperatures (5, 15, 25 and 35 ◦C). The extraction yield and the physicochemical, thermal, pasting, crystallinity and morphological properties of starches were determined.

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The enzymatic synthesis of fructooligosaccharides (FOS) was carried out using a partially purified -fructofuranosidase from the commercial enzyme preparation Viscozyme L. Partial purification of -fructofuranosidase from Viscozyme L was done by batch adsorption using ion-exchange resin DEAESepharose, showing a 6-fold increase in specific activity.

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