Chemical Characterization of Polysaccharides

Rußler, Axel; Bogolitsyna, Anna; Zuckerstätter, Gerhard; Potthast, Antje; Rosenau, Thomas

doi:10.1007/978-3-7091-0421-7_4

Cited by 3 publications

(2 citation statements)

References 180 publications

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“…We note the gradual reduction in gloss and the appearance of a yellow hue, which is commonly seen in cellulosic materials upon heating. The yellowing at elevated temperatures is attributed to the formation of chromophores, such as quinones and acetophenone, often as the result of condensation reactions. , The thermomechanical properties of the composite were however not found to be negatively affected by the reshaping cycles, as indicated by the stable melt creep behavior as well as an invariant T m (Figure S5). We would like to stress that the residence time of the four times re-extruded material was a total of 25 min at 140 °C in the compounder, as well as a further 100 min at 120 °C during the creep experiment.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Nanocellulose Networks for Thermoset-like yet Recyclable Plastics with a High Melt Stiffness and Creep Resistance

Peterson¹,

Östergren²,

Lotsari³

et al. 2019

Biomacromolecules

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Many polymers, including polyethylene, feature a relatively low melting point and hence must be cross-linked to make them viable for applications that demand a high stiffness and creep resistance at elevated temperatures. The resulting thermoset plastics cannot be recycled, and therefore alternative materials with a reconfigurable internal network structure are in high demand. Here, we establish that such a thermoset-like yet recyclable material can be realized through the addition of a nanocellulose reinforcing agent. A network consisting of cellulose nanocrystals, nano- or microfibrils imparts many of the characteristics that are usually achieved through chemical cross-linking. For instance, the addition of only 7.5 wt % of either nanocellulose material significantly enhances the melt stiffness of an otherwise molten ethylene-acrylate copolymer by at least 1 order of magnitude. At the same time, the nanocellulose network reduces the melt creep elongation to less than 10%, whereas the neat molten matrix would rupture. At high shear rates, however, the molten composites do not display a significantly higher viscosity than the copolymer matrix, and therefore retain the processability of a thermoplastic material. Repeated re-extrusion at 140 °C does not compromise the thermomechanical properties, which indicates a high degree of recyclability. The versatility of dynamic nanocellulose networks is illustrated by 3D printing of a cellulose composite, where the high melt stiffness improves the printability of the resin.

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Section: Resultsmentioning

confidence: 99%

Dynamic Nanocellulose Networks for Thermoset-like yet Recyclable Plastics with a High Melt Stiffness and Creep Resistance

Peterson¹,

Östergren²,

Lotsari³

et al. 2019

Biomacromolecules

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“…The analytical methods used to support the chemical characterization of CHMPs mainly include gas chromatography (GC), high performance liquid chromatography (HPLC), nuclear magnetic resonance (NMR) spectroscopy, methylation analysis, Fourier transform infrared spectroscopy (FT−IR), gas chromatography-mass spectrometry (GC−MS), and Smith degradation analysis. [101][102][103][104][105] Table 1 summarizes the existing information on the basic structural characteristics of CHMPs.…”

Section: Structural Characteristics Of Chmpsmentioning

confidence: 99%

Extraction, Separation, Purification, Chemical Characterizations, and Biological Activities of Polysaccharides from Chinese Herbal Medicine: A Review

et al. 2022

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Chinese herbal medicine, as a huge and diverse population, is rich in flavonoids, volatile oils, organic acids, terpenoids, alkaloids, and polysaccharides. Polysaccharides are the most important active ingredient in Chinese herbal medicine. Many studies have confirmed that Chinese herbal medicine polysaccharides (CHMPs) have antioxidant, anti-inflammatory, anti-aging, anti-tumor, hypoglycemic, hypolipidemic, regulating intestinal flora, improving immunity, and other biological activities. Obviously, CHMPs have good development potential and application prospects in the fields of biomedicine, food, and health products. However, different extraction and purification methods have a certain impact on the structure of CHMPs, and structure is closely related to its functional characteristics. Hence, a systematic review of the research progress and future prospects of CHMPs is necessary to promote their better understanding. In this paper, current knowledge on extraction, separation, and purification methods, chemical characterizations, and biological activities of CHMPs are summarized. This review provides an important theoretical reference for the further development and utilization of natural polysaccharides.

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A systematic review on polysaccharides from fermented Cordyceps sinensis: Advances in the preparation, structural characterization, bioactivities, structure-activity relationships

Yao,

Zhu,

Chen

et al. 2024

International Journal of Biological Macromolecules

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Chemical Characterization of Polysaccharides

Cited by 3 publications

References 180 publications

Dynamic Nanocellulose Networks for Thermoset-like yet Recyclable Plastics with a High Melt Stiffness and Creep Resistance

Dynamic Nanocellulose Networks for Thermoset-like yet Recyclable Plastics with a High Melt Stiffness and Creep Resistance

Extraction, Separation, Purification, Chemical Characterizations, and Biological Activities of Polysaccharides from Chinese Herbal Medicine: A Review

A systematic review on polysaccharides from fermented Cordyceps sinensis: Advances in the preparation, structural characterization, bioactivities, structure-activity relationships

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