Emulsifying properties of Ghanaian grewia gum

Abstract

Grewia gums were extracted with phosphate (PB) and sodium metabisulphite buffers (SMB) and their emulsification properties in acidic oil-in-water emulsions on ageing were studied by means of droplet size distribution, f-potential measurements, interfacial composition analysis and viscometry. PB extracts showed smaller droplet sizes (~10 lm) than SMB isolates (>35 lm) and greater long-term stability. PBstabilised emulsions also demonstrated the least polysaccharide (~0.6 mg m À2 ) and protein (~0.2 mg m À2 ) interfacial coverage compared with SMB counterparts (~1.5 mg m À2 for polysaccharide and~1 mg m À2 for protein). f-Potential measurements revealed negative interfacial charge for all emulsions confirming the presence of polysaccharide-laden interfaces. Droplet size distribution also varied among emulsions during ageing indicating a complex relationship between interfacial composition and stability. The present work shows that different emulsifying properties may be obtained depending on the extraction technique employed that could be exploited in preparation of emulsions for flavour or bioactive-delivery applications.Grewia gum-stabilised emulsions F.M. Kpodo et al.

A Cost-Effective Extraction Method for Improved Physicochemical, Rheological and Microbiological Properties of Grewia mollis gum

“…7 Grewia gum is increasingly relevant for pharmaceutical application because it can potentially be used as a binder in tablets, 8 bioadhesive for transmucosal drug delivery, 9 suspending agents in liquid dosage forms, 10 film-coating agent for sustained release formulations, 11 viscosity enhancer, 12 and emulsifier. 13 Potential phytochemical principles present in their aerial parts include flavonoids, saponins, tannins, cardiac glycosides and phenols with anti-tumour, antiinflammatory, antimicrobial, cardioprotective and anti-oxidant properties. 14 The moisture content of Grewia gum may be dependent on its method of preparation as well as its environmental conditions, and the moisture level of the gum should be minimized for the formulation of moisture sensitive drugs.…”