CHARACTERIZATION OF GREWIA GUM, A POTENTIAL PHARMACEUTICAL EXCIPIENT

  • Elijah I. Nep Aston University, Birmingham
  • Barbara R. Conway Aston University, Birmingham

Abstract

Grewia gum was extracted from the inner stem bark of Grewia mollis and characterized by several techniques such as gas chromatography (GC), gel permeation chromatography (GPC), scanning electron microscopy (SEM), dilute solution viscometry, differential scanning calorimetry (DSC) and thermogrametric analysis of the extracted samples. Spectroscopic techniques such as x-ray photoelectron spectroscopy (XPS), fourier-transformed infrared (FT-IR), solid-state nuclear magnetic resonance (NMR), and 1H and 13C NMR techniques were also used to characterize the gum. The results showed that grewia gum is a typically amorphous polysaccharide gum containing glucose, rhamnose, galactose, arabinose and xylose as neutral sugars. It has an intrinsic viscosity of 48.36 0.37 dl/g and an average molecular weight of 5925 kDa expressed as the pullulan equivalent. The gum slowly hydrated in water, dispersing and swelling to form a highly viscous dispersion exhibiting pseudoplastic flow behaviour. The polysaccharide gum is thermally stable and may have application as stabilizer or suspending agent in foods, cosmetics and in pharmaceuticals. It may have application as a binder or sustained-release polymer matrix in tablets or granulations.

Author Biographies

Elijah I. Nep, Aston University, Birmingham
Medicines Research unit Life and Health Sciences PhD student
Barbara R. Conway, Aston University, Birmingham
Medicines Research Unit Life and Health Sciences Senior Lecturer
Published
2010-06-18
How to Cite
NEP, Elijah I.; CONWAY, Barbara R.. CHARACTERIZATION OF GREWIA GUM, A POTENTIAL PHARMACEUTICAL EXCIPIENT. Journal of Excipients and Food Chemicals, [S.l.], v. 1, n. 1, p. 30-40, june 2010. ISSN 21502668. Available at: <https://ojs.abo.fi/ojs/index.php/jefc/article/view/12>. Date accessed: 27 oct. 2021.
Section
Original Research Articles

Keywords

grewia gum, extraction, polysaccharide, pseudoplastic flow, suspending agent, binder, sustained release.