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vol. 18, nr. 2 (2011)
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Influence of homogenisation on physical properties of lemon aroma microcapsules ob-tained by spray drying method
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Emilia Janiszewska, Katarzyna Krupa, Dorota Witrowa-Rajchert
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Department of Food Engineering and Process Management, Faculty of Food Sciences, Warsaw University of Life Sciences (WULS-SGGW) ul. Nowoursynowska 159C, 02-776 Warszawa |
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vol. 18 (2011), nr. 2,
pp. 287-296
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abstract:
In the aroma micro-encapsulation process by spray drying, in addition to the choice of suitable carrier material and process parameters, the properties of powders, which also depend on the physical proper-ties of the emulsion subjected to drying, have a significant impact on the effectiveness of the caption of aroma. Therefore the aim of this study was to examine the relationship between the nature of the homogenisation method of lemon aroma emulsions, and selected physical properties of powders. Arabic gum was used as the carrier for the lemon aroma micro-encapsulation. For the analyses, solutions were prepared with a carrier concentration of 30%, the flavour addition being 6% of the total weight of the solution. The solutions were homogenised using single-pressure homogenisation at a pressure of 30 MPa, two-stage pressure homogenisation at pressures of 30 and 10 MPa at the first and second step and high speed mixer for 30 minutes at 24,000 rpm. Drying of the emulsion was carried out in a spray dryer, at disc speed of 39,000 rev min-1 and a feed flux of 0.5•10-6 m3 s-1 at inlet air temperature of 160°C. The emulsion obtained by high shear mixer homogenisation showed the highest viscosity. Slightly higher density was observed for emulsions obtained by two-step pressure homogenisation. Evaporation occurred the least intensively for powders obtained from the emulsion from two-stage pressure homogenisation, in which the water content was the highest. Powders based on the emulsion homogenised by mixer homogenisation were characterised by the lowest porosity, apparent density and bulk density. The highest values of all parameters was received for powders from the emulsion obtained in the process of two-stage pressure homogenisation.
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keywords:
apparent density, bulk density, equivalent diameter, spray drying, lemon flavour
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original in:
Polish
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