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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Shakun, Maryia Maier, Helena Heinze, Thomas Kilz, Peter Radke, Wolfgang |
| Description | Country affiliation: Germany Author Affiliation: Shakun M ( Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF, Bereich Kunststoffe, Schlossgartenstrasse 6, D-64289 Darmstadt, Germany.) |
| Abstract | Two series of sodium carboxymethyl celluloses (NaCMCs) derived from microcrystalline cellulose (Avicel samples) and cotton linters (BWL samples) with average degrees of substitution (DS) ranging from DS=0.45 to DS=1.55 were characterized by size exclusion chromatography with multi-angle laser light scattering detection (SEC-MALLS) in 100 mmol/L aqueous ammonium acetate (NH4OAc) as vaporizable eluent system. The application of vaporizable NH4OAc allows future use of the eluent system in two-dimensional separations employing evaporative light scattering detection (ELSD). The losses of samples during filtration and during the chromatographic experiment were determined. The scaling exponent as of the relation [Formula: see text] was approx. 0.61, showing that NaCMCs exhibit an expanded coil conformation in solution. No systematic dependencies of as on DS were observed. The dependences of molar mass on SEC-elution volume for samples of different DS can be well described by a common calibration curve, which is of advantage, as it allows the determination of molar masses of unknown samples by using the same calibration curve, irrespective of the DS of the NaCMC sample. Since no commercial NaCMC standards are available, correction factors were determined allowing converting a pullulan based calibration curve into a NaCMC calibration using the broad calibration approach. The weight average molar masses derived using the so established calibration curve closely agree with the ones determined by light scattering, proving the accuracy of the correction factors determined. |
| File Format | HTM / HTML |
| ISSN | 01448617 |
| Issue Number | 1 |
| Journal | Carbohydrate Polymers |
| Volume Number | 95 |
| e-ISSN | 18791344 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2013-06-05 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Biochemistry__semicolon__materials Discipline Science Carboxymethylcellulose Sodium Chemistry Acetates Cellulose Chromatography, Gel Molecular Weight Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Materials Chemistry Polymers and Plastics |
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