Journal article
A Study of Moisture Sorption and Dielectric Processes of Starch and Sodium Starch Glycolate
Pharmaceutical research, Vol.34(12), pp.2675-2688
12/01/2017
DOI: 10.1007/s11095-017-2252-x
PMID: 28875274
Abstract
This study explored the potential of combining the use of moisture sorption isotherms and dielectric relaxation profiles of starch and sodium starch glycolate (SSG) to probe the location of moisture in dried and hydrated samples.
Starch and SSG samples, dried and hydrated, were prepared. For hydrated samples, their moisture contents were determined. The samples were probed by dielectric spectroscopy using a frequency band of 0.1 Hz to 1 MHz to investigate their moisture-related relaxation profiles. The moisture sorption and desorption isotherms of starch and SSG were generated using a vapor sorption analyzer, and modeled using the Guggenheim-Anderson-de Boer equation.
A clear high frequency relaxation process was detected in both dried and hydrated starches, while for dried starch, an additional slower low frequency process was also detected. The high frequency relaxation processes in hydrated and dried starches were assigned to the coupled starch-hydrated water relaxation. The low frequency relaxation in dried starch was attributed to the local chain motions of the starch backbone. No relaxation process associated with water was detected in both hydrated and dried SSG within the frequency and temperature range used in this study. The moisture sorption isotherms of SSG suggest the presence of high energy free water, which could have masked the relaxation process of the bound water during dielectric measurements.
The combined study of moisture sorption isotherms and dielectric spectroscopy was shown to be beneficial and complementary in probing the effects of moisture on the relaxation processes of starch and SSG.
Details
- Title: Subtitle
- A Study of Moisture Sorption and Dielectric Processes of Starch and Sodium Starch Glycolate
- Creators
- Tze Ning Hiew - National University of SingaporeRongying Huang - Hebrew University of JerusalemIvan Popov - Hebrew University of JerusalemYuri Feldman - Hebrew University of JerusalemPaul Wan Sia Heng - National University of Singapore
- Resource Type
- Journal article
- Publication Details
- Pharmaceutical research, Vol.34(12), pp.2675-2688
- Publisher
- Springer Nature
- DOI
- 10.1007/s11095-017-2252-x
- PMID
- 28875274
- ISSN
- 0724-8741
- eISSN
- 1573-904X
- Number of pages
- 14
- Grant note
- National University of Singapore Graduate Research Scholarship; National University of Singapore N-148-000-008-001 / GEA-NUS PPRL fund
- Language
- English
- Date published
- 12/01/2017
- Academic Unit
- Pharmaceutical Sciences and Experimental Therapeutics
- Record Identifier
- 9984365890002771
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