Grewia gum 1:some mechanical and swelling properties of compact and film


Purpose: To study the mechanical and dynamic swelling properties of grewia gum, evaluate its compression behaviour and determine the effect of drying methods on its properties. Methods: Compacts (500 mg) of both freeze-dried and air-dried grewia gum were separately prepared by compression on a potassium bromide (KBr) press at different pressures and subjected to Heckel analysis. Swelling studies were performed using 200 mg compacts of the gum (freeze-dried or air-dried) compressed on a KBr press. The mechanical properties of the films of the gum prepared by casting 1 % dispersions of the gum were evaluated using Hounsfield tensiometer. The mechanical properties of grewia gum films were compared with films of pullulan and guar gum which were similarly prepared. The effect of temperature on the water uptake of the compacts was studied and the data subjected to Schott's analysis. Results: Drying conditions had no effect on the yield pressure of the gum compacts as both air-dried and freeze-dried fractions had a yield pressure of 322.6 MPa. The plots based on Schott's equation for the grewia gum samples showed that both samples (freeze-dried and air-dried) exhibited long swelling times. Grewia gum film had a tensile strength of 19.22±3.61 MPa which was similar to that of pullulan films (p > 0.05). It had an elastic modulus of 2.13±0.12 N/mm2 which was significantly lower (p < 0.05) than those of pullulan and guar gum with elastic moduli of 3.33±0.00 and 2.86±0.00 N/mm2, respectively. Conclusion: The type of drying method used does not have any effect on the degree of plasticity of grewia gum compacts. Grewia gum obtained by either drying method exhibited extended swelling duration. Matrix tablet formulations of the gum will likely swell slowly and promote sustained release of drug.

Publication DOI:
Divisions: College of Health & Life Sciences > Aston Pharmacy School
Additional Information: Creative Commons Attribution License ( © Pharmacotherapy Group
Uncontrolled Keywords: films,Grewia gum compact,Heckel analysis,swelling behaviour,Pharmaceutical Science,Pharmacology (medical)
Publication ISSN: 1596-9827
Last Modified: 05 Jan 2024 08:07
Date Deposited: 14 Mar 2016 15:05
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
http://www.tjpr ... 2011_10_4_3.php (Publisher URL)
PURE Output Type: Article
Published Date: 2011-08-01
Accepted Date: 2011-06-08
Submitted Date: 2010-10-30
Authors: Nep, Elijah I.
Conway, Barbara R.



Version: Published Version

License: Creative Commons Attribution

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