Re-characterization of the surface properties of non-ionic cellulose ethers by means of column wicking technique

Shen, Qing; Wang, Zhixin; Hu, Jianfeng; Gu, Qingfeng

doi:10.1016/j.colsurfa.2004.03.017

Cited by 18 publications

(10 citation statements)

References 16 publications

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“…In fact, according to Figure 3 and Table 3, the nonpolar diiodomethane greatly adsorbed by both cellulose and chitosan is due to these biomaterials both being greatly in the nonpolar Lifshitz−van der Waals interaction component, especially the cellulose. 10,11,14 In terms of Figure 3, cellulose adsorbed the nonpolar solvents greater, while the chitosan adsorbed the polar solvents greater, especially with the voltage increase. This is reasonable and understandable because the polarity of chitosan is greater by about 450% than that of the cellulose (Table 3).…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…10−13 Additionally, the surface properties of cellulose and chitosan have been broadly studied and reported elsewhere. 10,11,14 When considering the application of cellulose and chitosan, it is a requirement to know their electric response, but this is unknown. In this work, we therefore aimed to study their electric adsorption behavior.…”

Section: ■ Introductionmentioning

confidence: 99%

“…15−22 ■ EXPERIMENTAL SECTION Materials. In this case, the commercial cellulose, C8002, was purchased from Sigma Co. 10,11 and used as received without further treatment, and its median size was about 50−80 μm in the wet state. A commercial powder chitosan, supplied by Shanghai Tian-Qing Biomaterial Company, was used as received.…”

Section: ■ Introductionmentioning

confidence: 99%

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Electric-Assisted Capillary Rise Adsorption of Polar and Nonpolar Solvents by Cellulose and Chitosan

Yan

Wang

et al. 2016

J. Phys. Chem. B

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Electric-assisted capillary rise adsorption of polar and nonpolar solvents by cellulose and chitosan was studied by employing an electrostatic generator to assist a common capillary rise wetting by taking the anode and cathode electrodes respectively linked to a metal tube charged with samples and the probe solvent. To vary the voltage at 0, 100, 200, and 300 V, respectively, the recorded dynamic adsorption results showed that the cellulose and chitosan both kept a stable adsorption of the nonpolar hexane and diiodomethane, obviously ignoring the voltage increase. Moreover, the hexane amount adsorbed by cellulose and chitosan is similar, while the diiodomethane amount was adsorbed to a greater amount by cellulose as compared with the chitosan corresponding to these two biomaterials-based nonpolar components, for example, greater for cellulose and smaller for chitosan. Results also showed that the adsorption of polar water and formamide was gradually increased with the voltage increase, especially for chitosan, to correspond to the polar component of these materials, for example, greater for chitosan and smaller for cellulose. These adsorption behaviors suggested that the application of an extra electric field can only enhance the adsorption of polar solvent, and the molecular structure, for exmaple, the β-(1-4)-linked d-glucosamine units of chitosan, has sensitive electric field responses in polar solvent adsorption as compared with those of the β(1-4)-linked d-glucose units of cellulose. The reason for the electric adsorption behaviors was known due to the presence of an extra electric-field-induced reduction of the total surface tension of solvent and mainly the polar component.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: ■ Introductionmentioning

confidence: 99%

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Electric-Assisted Capillary Rise Adsorption of Polar and Nonpolar Solvents by Cellulose and Chitosan

Yan

Wang

et al. 2016

J. Phys. Chem. B

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“…The first step of the work was the synthesis of a set of 6‐deoxysugar disaccharide methyl glycosides. This was accomplished by the standard glycosylation reaction of L ‐rhamnose thioglycoside 1 12 with the known glycosyl acceptors 2 ,13 3 ,14 4 ,14 5 ,15 6 ,15 and the novel acceptor 8 (obtained by phase‐transfer benzylation of diol 7 )16 as well as the reaction of L ‐fucose thioglycoside 9 12 with glycosyl acceptor 10 17 (Scheme ). Glycosylations under the NIS/TfOH protocol proceeded in moderate to excellent yields to give the disaccharide methyl glycosides 11 – 17 .…”

Section: Resultsmentioning

confidence: 99%

Acetolysis of 6‐Deoxysugar Disaccharide Building Blocks: exo versus endo Activation

2008

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Two different protocols for the mild and selective acetolysis of 6-deoxysugar methyl disaccharides under thermodynamic or kinetic control have been developed. The structures of the disaccharides obtained depend on the protocol used and, in the kinetically controlled cases, on the 6-deoxysugar configuration and protecting group pattern too. The behavior of 6-deoxyhexose oligosaccharides of different series (rhamno,

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“…Initially, 1,2‐anhydro‐ l ‐rhamnose ( 6 ) and 6‐ O ‐benzyl‐1‐hexanol ( 7 ) were selected as the glycosyl donor and acceptor, respectively. The glycosylation of 6 and 7 was attempted using catalytic amounts of borinic acids 8 a – c under the same reaction conditions.…”

Section: Methodsmentioning

confidence: 99%

Stereospecific β‐l‐Rhamnopyranosylation through an S_Ni‐Type Mechanism by Using Organoboron Reagents

et al. 2018

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Stereospecific β-l-rhamnopyranosylations were conducted using a 1,2-anhydro-l-rhamnopyranose donor and mono-ol or diol acceptors in the presence of a glycosyl-acceptor-derived borinic or boronic ester. Reactions proceeded smoothly to provide the corresponding β-l-rhamnopyranosides (β-l-Rhap) with complete stereoselectivity in moderate to high yields without any further additives under mild conditions. Mechanistic studies of the borinic ester mediated glycosylation using C kinetic isotope effect (KIE) measurements and DFT calculations were consistent with a concerted S i mechanism with an exploded transition state. In addition, the present glycosylation method was applied successfully to the synthesis of a trisaccharide, α-l-Rhap-(1,2)-β-l-Rhap-(1,4)-Glcp, derived from Streptococcus pneumoniae serotypes 7B, 7C, and 7D.

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Re-characterization of the surface properties of non-ionic cellulose ethers by means of column wicking technique

Cited by 18 publications

References 16 publications

Electric-Assisted Capillary Rise Adsorption of Polar and Nonpolar Solvents by Cellulose and Chitosan

Electric-Assisted Capillary Rise Adsorption of Polar and Nonpolar Solvents by Cellulose and Chitosan

Acetolysis of 6‐Deoxysugar Disaccharide Building Blocks: exo versus endo Activation

Stereospecific β‐l‐Rhamnopyranosylation through an S_Ni‐Type Mechanism by Using Organoboron Reagents

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Re-characterization of the surface properties of non-ionic cellulose ethers by means of column wicking technique

Cited by 18 publications

References 16 publications

Electric-Assisted Capillary Rise Adsorption of Polar and Nonpolar Solvents by Cellulose and Chitosan

Electric-Assisted Capillary Rise Adsorption of Polar and Nonpolar Solvents by Cellulose and Chitosan

Acetolysis of 6‐Deoxysugar Disaccharide Building Blocks: exo versus endo Activation

Stereospecific β‐l‐Rhamnopyranosylation through an SNi‐Type Mechanism by Using Organoboron Reagents

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Product

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Stereospecific β‐l‐Rhamnopyranosylation through an S_Ni‐Type Mechanism by Using Organoboron Reagents