Effect of high-hydrostatic pressure and pH on the rheological properties of gum arabic
Panteloglou, A. G., Bell, A. E. and Ma, F. (2010) Effect of high-hydrostatic pressure and pH on the rheological properties of gum arabic. Food Chemistry, 122 (4). pp. 972-979. ISSN 0308-8146
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To link to this article DOI: 10.1016/j.foodchem.2010.02.037
The effect on the viscoelastic behaviour, of pressure-treating hydrated gumarabic samples (800 MPa) at different pH values (2.8, 4.2 and 8.0) was investigated, using controlled stress rheometry. The treated samples were analysed for their complex (G∗), storage (G′) and loss (G″) moduli as a function of frequency, using dynamic oscillatory testing. Significant changes in the rheologicalproperties were observed in both the pressurised gum solutions and in those previously buffered at pH 2.8. The gum, at its natural pH (4.25) and at alkaline pH (8.0), was enhanced by pressure treatment, but only for the already “good” quality gum samples. High-pressure treatment had substantial effects on the frequency-dependence of the moduli of both the pressurised and the pressurised/pH-treated solutions, with the latter being more pronounced, suggesting differing structures or changes in the overall degree of interaction of the gum systems after pressure treatment.