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Emulsifying properties of Ghanaian grewia gum
Author(s) -
Kpodo Fidelis Mawunyo,
Agbenorhevi Jacob Kwaku,
Alba Katerina,
Kontogiorgos Vassilis
Publication year - 2020
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/ijfs.14389
Subject(s) - viscometer , polysaccharide , chemistry , chromatography , extraction (chemistry) , composition (language) , chemical engineering , sodium , materials science , viscosity , organic chemistry , composite material , linguistics , philosophy , engineering
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, ζ‐potential measurements, interfacial composition analysis and viscometry. PB extracts showed smaller droplet sizes (~10 μm) than SMB isolates (>35 μm) and greater long‐term stability. PB‐stabilised emulsions also demonstrated the least polysaccharide (~0.6 mg m −2 ) and protein (~0.2 mg m −2 ) interfacial coverage compared with SMB counterparts (~1.5 mg m −2 for polysaccharide and ~ 1 mg m −2 for protein). ζ‐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.