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Rapid determination of degree of deacetylation of chitosan by a headspace analysis based Titrimetric technique.
- Source :
-
Polymer Testing . Jul2019, Vol. 76, p340-343. 4p. - Publication Year :
- 2019
-
Abstract
- This paper reports on a novel method for rapid determination of the degree of deacetylation (DD) of chitosan samples by headspace gas chromatography (HS-GC). In this method, overdose of an acid is added to protonate the free amino groups in chitosan, which further reacts with bicarbonate (as an alkali titrant) in a close vial. Based on measuring the HS-GC signal for CO 2 vs. the volume of HCO 3 − added by a stepwise titration, two transition points can be obtained. The DD value is calculated by net volume of HCO 3 − consumed, i.e., by the R NH 3 + groups in chitosan. The results showed that the present method has a good measurement precision (RSD < 0.82%) and accuracy (relative differences < 6.46% when compared with the results measured by a reference method). Since the HS-GC can perform an automated sample reaction equilibration and measurement, it could be much more efficient than the existing methods in the batch sample analysis. Image 1 • A novel HS-GC technique was developed to quantify the DD value of chitosan. • The resulting product CO 2 is used as the indicator. • The method was based on determining two transition points from CO 2 releasing curve. • This method is accurate and suitable to be used in the batch sample analysis. [ABSTRACT FROM AUTHOR]
- Subjects :
- *DEACETYLATION
*TRANSITION temperature
*AMINO group
*FREE groups
*GAS chromatography
Subjects
Details
- Language :
- English
- ISSN :
- 01429418
- Volume :
- 76
- Database :
- Academic Search Index
- Journal :
- Polymer Testing
- Publication Type :
- Academic Journal
- Accession number :
- 136419158
- Full Text :
- https://doi.org/10.1016/j.polymertesting.2019.03.034