In this work, some physicochemical characteristics of Prunus cerasus gum exudates (PCGE) were evaluated. Ash, moisture, protein, fat and carbohydrate contents were found to be 2.8, 6.2, 2.4, 1.48 and 71.51%, respectively. PCGE consisted of l-arabinose, d-galactose, xylose, mannose and rhamnose in a 31.31:24.04:21.31:17.63:5.69 molar percentages. FTIR spectrum showed the presence of carboxyl, hydroxyl and methyl groups and glycoside bonds. 13C NMR and 1H NMR analysis suggested an arabinogalactan structure for this gum. The weight average molecular weight (1.119 × 107 g/mol), the number average molecular weight (4.153 × 106 g/mol) and polydispersity index (2.69) were determined. Intrinsic viscosity for PCGE in deionized water was 3.7 dl/g according to Kraemer equation. Steady shear measurements as a function of concentration (4, 6 and 8%) showed that PCGE solutions had shear thinning behaviour. Oscillatory shear experiments demonstrated that in all tested concentrations (4, 6 and 8%), loss modulus (G″) is superior to storage modulus (G′), indicating that the solutions demonstrate higher viscous behaviour than a clear tendency to form a gel. Colour parameters including lightness (84 ± 0.219), redness (2.048 ± 0.043), yellowness (21.962 ± 0.088) and chroma (22.057 ± 0.12) were determined.
Food Hydrocolloids – Elsevier
Published: Dec 1, 2016
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