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PHYSICAL PROPERTIES OF DIFFERENT ADULTERATED EGYPTIAN HONEY

The physical properties (pH, electrical conductivity, density, total suspended solids, refractive index, surface tension and moisture content) of different types of Egyptian honeys (black seed honey, clover honey, desert honey and mountain flower honey) were investigated. Honey samples each of volume 100ml. were adulterated with different volumes (2, 4, 6, 8 and 10 ml) of starch solution, glucose, molasses and distilled water respectively and were tested and compared to the pure sample. Rheological properties of pure Egyptian honey samples were compared to purchased and adulterated samples, the flow behavior index indicates that the samples exhibit shear thinning flow behavior and some were approximately Newtonian behavior. Apparent viscosity and shear stress of pure and purchased samples of all honey types studied were higher than the adulterated samples; the effect of adding different volumes of adulterants was also studied at different shear rates 1.1308, 5.6544, 11.3088 s-1, which revealed that apparent viscosity decreases as volume of adulterants increase for all the studied shear rates. The combined effect of shear rate and volume of adulterant on the shear stress was determined with data analysis.