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KMID : 0380620090410010032
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Korean Journal of Food Science and Technology
2009 Volume.41 No. 1 p.32 ~ p.36
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Physical Properties of Freeze-Dried Powder of Aloe Vera Gel with Respect to the Concentrating Degree as Pre-Treatment
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Lee Nam-Jae
Lee Seong-Ju
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Abstract
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The physical properties of freeze-dried Aloe vera gel powders were examined according to the influence of theconcentration degrees of the gel solutions as raw materials during freeze-drying. As a pre-treatment prior to freeze-drying,the gel solutions were vacuum-concentrated at three concentration levels (g water/g solids): high (H), 76; medium (M),119; and low (L), 159. The water contents of the three powder samples were almost the same. For their viscositymeasurements, non-Newtonian fluid behavior with shear thinning was observed in samples H and M, whereas Newtonianliquid behavior was found in sample L. In electrical conductivity measurements, sample H showed the highest conductivityupon dissolving the powder in water. For their water sorption isotherms, sample H was analyzed to have the least amountof bound water. Finally, it was determined that the degree of concentration caused only slight differences in the physicalproperties of freeze-dried Aloe gel powders.
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KEYWORD
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Aloe vera gel powder, freeze-drying, concentration, physical properties
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