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Postcolonial crisis publics: analyzing social media marketing wellbeing campaign within Of india throughout the COVID-19 crisis.
To evaluate the reaction conditions on the physicochemical properties of composites of starch and stearic acid, composites were prepared under reaction conditions that varied the starch concentration (0.5, 1, 3%), stearic acid addition level (5, 10, 25 mg), stearic acid addition rate (2, 4, 8, 16 mL/min), and temperature (70, 80, 90 °C). All conditions significantly impacted the recovery, mean particle size, and zeta potential of samples. Specifically, a higher starch concentration and temperature significantly increased the recovery of stearic acid, but the mean particle size of the composite increased with higher stearic acid addition level and starch concentration. Stearic acid content in the composite exhibited a significant correlation with zeta potential (r = 0.818, p = 0.001). During enzymatic digestion for 20 min, 8% of the stearic acid was released from the composite. Approximately 10 % of the stearic acid was degraded after 36 h of storage at 50°C under 75 % relative humidity. The present study aimed at investigating the structural features and antitumor properties of a novel heteropolysaccharide (CSP-W-2) obtained from the fruit of Chaenomeles Speciosa (Sweet) Nakai. CSP-W-2 demonstrate that they mainly contain glucose, galactose, arabinose, mannose, xylose in a ratio of 3.7 3.2 1.7 0.9 0.4, with the molecular weight of 8.7 kDa. Its backbone is predominantly composed of 1,4 linked β-D-Galp, 1,4 linked α-D-Glcp, 1,4 linked β-D-Glcp, and 1,4,6-β-D-Glcp, additionally some branches contained 1,5 linked α-L-Araf, 1,4 linked β-D-Glcp, 1,3 linked α-L-Araf, and T linked β-D-Manp according to the results of partial acid hydrolysis analysis, methylation analysis, IR and NMR spectra. The antitumor properties study results demonstrated that CSP-W-2 had an inhibitory effect on HepG2 growth by enhancing the nucleus shrinkage and apoptosis. These findings indicate that CSP-W-2 had antitumor potential in the treatment of human liver tumor. In this work, a novel selective and low temperature H2S gas sensor was fabricated based on copper (II) oxide nanoparticles (CuO NPs) in different concentrations, embedded in a conductivity-engineered organic (glycerol ionic liquid-doped chitosan) membrane/film. The sensing membranes of organic-inorganic nanocomposites (CS-IL-CuO) were prepared by casting method and were tested against H2S gas with reference to time at different temperatures and H2S gas concentrations. The fabricated sensor showed a fast response (14 s) and good sensitivity (15 ppm) towards H2S gas at a low temperature of 40 °C. Moreover, the sensor showed a high reversibility and less humidity dependence at 40 °C. Moreover, this type of hybrid nanocomposites sensor is easy and inexpensive to manufacture and is energy efficient. Thus, it has potential to be used for industrial applications in harsh environments. The aim of this work was to explore the effect of various molecular weight (Mw) chitosan depolymerization products (CDP) on the silver nanoparticles (AgNPs) and chitosan/AgNPs blend films production. Produced AgNPs, stable during 30 days in a colloïdal form, were characterized in terms of UV-vis, transmission electron microscopy (TEM), dynamic light scattering (DLS) and fourier transform infrared spectroscopy (FTIR) analyses. AgNPs displayed interesting antibacterial and antioxidant properties that were affected by the physicochemical properties of used chitosans. Interestingly, CDP may be used for the preparation of bioactive and stable AgNPs. Additionally, chitosan/AgNPs blend films were prepared and characterized in terms of physiochemical and biological properties. As compared to the chitosan film, various properties were enhanced in the chitosan/AgNPs blend films, including light barrier, opacity, elongation at break, as well as bioactivities, thus suggesting that films could be used as novel alternative food packaging applications. Bacterial cellulose (BC) has proven its high potential as active wound dressing and drug delivery system in many scientific studies, but the transferability of the methods to efficient manufacturing still needs to be demonstrated. This study presents a technically feasible, straightforward and efficient approach to modify BC according to specific medical requirements, to scale-up the cultivation and to load the active pharmaceutical ingredient of interest. By means of in situ-modification of the network structure using water-soluble poly(ethylene glycol) 400 and 4000 on pilot-scale, up to 41.5 ± 3.0 % higher transparency of the dressing, 40.6 ± 3.8 % increased loading capacity and 9% increased total release of the anti-inflammatory model drug diclofenac sodium could be obtained. Spray loading was investigated as material efficient alternative to absorption loading allowing a significant reduction in loading time. Nanocomposite hydrogels consisting of a synthetic matrix reinforced by nanosized crystalline polysaccharides offer significant potential in various fields. Different from nanocellulose, the combination of nanochitin with synthetic polymers to obtain nanocomposite hydrogels has not been extensively and systematically studied. Herein, a physically and chemically dual crosslinked nanocomposite hydrogel was successfully synthesized, where chitin nanowhiskers (ChNWs) and Zn2+ were incorporated within polyacrylamide (PAAm) matrix. Nanochitin/metal ion dual reinforcement imparts increased elasticity, enhanced mechanical properties, and improved recovery performance to PAAm network. The PAAm/ChNWs/Zn2+ hydrogel could be stretched to over 13 times its original length with tensile strength of 321.9 ± 8.2 kPa, and restore its original shape rapidly even when compressed at a strain of 95% with a corresponding compressive strength of 6.95 ± 0.20 MPa. The multiple crosslinks and interactions among ChNWs, Zn2+ and synthetic polymeric network were investigated. Moreover, the hydrogel was applied in drug release and soft bioelectronics. Colloidal systems prepared from carbohydrates are subject of intense research due to their potential to enhance drug permeability through biological membranes, however their characteristics and performance are never compared directly. Here we report the results of a comparative investigation of a series of butylglyceryl-modified polysaccharides (chitosan, guar gum, and pullulan) that were formulated into nanoparticles and loaded with a range of model actives (Doxorubicin, Rhodamine B, Angiotensin II). Butylglyceryl-modified guar gum and corresponding pullulan nanocarriers were more stable at physiological pH compared to those obtained from modified chitosan, and studies of the in-vitro interactions with mouse brain endothelial cells (bEnd3) indicated an increased biological membrane permeability and lack of toxicity at application-relevant concentrations. No significant haemolytic effect was observed, and confocal microscopy and flow cytometry studies confirmed the efficient cellular uptake and cytoplasmic localisation of NPs. Most promising characteristics for brain drug delivery applications were demonstrated by butylglyceryl pullulan nanocarriers. A low-molecular-weight chitosan (LMWC) sample was prepared by enzymatic hydrolysis, and used for investigation of special Maillard reaction products (MRPs) and factors affecting LMWC bioactivities. After undergoing MR, LMWC turned to brown color (termed BLMWC), showed reduction of several indices of rice growth promotion. This alteration of bioactivities was attributable to MRPs in BLMWC. A special MRP, 5-hydroxy-2-pyridine methanol isomer (5-H-2PMIS), was identified by HPLC and LC-MS. Analysis of key factors affecting MR, using this MRP as monitoring target compound and OD420 value, suggested that MR process can be minimized by storing LMWC under vacuum in a dry, low-temperature, neutral-pH environment. Na2SO3 was effective for inhibition of MR, at optimal concentration 0.5 %. Chemical and FTIR analyses showed that Na2SO3-treated sample conformed to the Chinese National Standard of chitosan (GB 29941-2013). Control of MR is essential for application of LMWC in food, pharmaceutical, and other industries. Three kinds of methods based on extrusion and 3D printing and different acidic solutions (formic acid (FA), acetic acid (AA), glycolic acid (GA) and lactic acid (LA)) were applied for manufacturing the CS ducts. The tensile properties and preliminary cytotoxicity were measured for selecting the optimal ratio of CS slurry. The 3D printability of CS slurry was also studied. The tensile strength, Young's modulus, and fracture strain were tested for evaluating the degree of mechanical matching to soft-tissue. The optimal solvent to CS was 30 wt.% GA solution. The CS slurry possessing shear-thinning properties was suitable for 3D printing. The tensile strength, Young's modulus, and fracture strain of the CS rods were 10.98 ± 0.61 MPa, 12.38 ± 1.19 MPa, and 146.03 ± 15.05 %, correspondingly. The CS ducts manufactured by 3D printing had an excellent mechanical matching to soft-tissue, outstanding biocompatibility and have great potential for soft-tissue restorations. Dubs-IN-1 Carrageenan fibers have attractive applications in textile, but their low strength remains a problem that needs to be urgently addressed. In this work, a novel facile, environmental friendly method for fabricate high-strength carrageenan fibers is proposed. It involves the crosslinking of a small amount of Ba2+ ions in the carrageenan solution, followed by using recyclable alcohol in coagulation and stretching baths. Carrageenan molecular chains were allowed to first sufficiently interact with metal barium ions, and then were stretched and dehydrated with alcohol to increase the hydrogen bonding interaction between the molecular chains. As a result, the carrageenan fibers with high-strength ionic and hydrogen bonds were obtained. The fibers obtained by the novel method had high tensile strength at 1.63 cN/dtex, which is two times higher than that of those obtained by the traditional process. The aim of the present study is to characterize the structure of a novel natural polysaccharide from Agrocybe aegirita (AAPS) and evaluate its anti-aging activity. The MALLS and GC-MS analysis indicated that the AAPS with molecular weights of 1.81 × 104 Da was mainly composed by rhamnose, fucose, mannose, and glucose in a molar ratio of 2.9010.253.7038.27. The FT-IR and NMR analysis showed that the backbone of AAPS was α-L-Rhap-(1→6)-β-D-Glcp-(1→2)-α-L-Fucp-(1→6)-α-D-Glcp-(1→5)-α-L-Araf-(1→4)-β-D-GlcpA-(1→5)-α-L-Araf-(1→6)-α-D-Manp-(1→6)-α-D-Manp-(1→2)-α-L-Fucp-(1→6)-β-D-Glap-(1→2)-α-L-Rhap-(1→6)-β-D-Galp-(1→, which linked with two side chains α-L-Fucp-(1→6)-β-D-Glcp-(1→6)-β-D-Manp-(1→ and α-D-Xylp-(1→2)-α-L-Fucp-(1→5) -α-D-Araf-(1→6)-β-D-Galp-(1→ at OH2 at H-4-arabinose and the terminal Galp residues, respectively. The MRC-5 cells induced by H2O2 were used to explore the anti-ageing effect and its underlying mechanism of AAPS. It showed a potent anti-ageing activity, representing by the increased cell viability and β-Gal viability, prevented G1-phase cell-cycle arrest, and decreased mitochondrial membrane potential. The polysaccharides extracted from A. aegirita might be applied in functional food as anti-ageing ingredient.
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