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KMID : 0380020080230020169
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Korean Journal of Biotechnology and Bioengineering
2008 Volume.23 No. 2 p.169 ~ p.176
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Concentration of Fresh Gel from Aloe vera L. by Using Ultrafiltration Process
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Baek Jin-Hong
Lee Shin-Young
Kim Sung-A
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Abstract
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The concentration of fresh gel from Aloe vera L. by using ulfrafiltration (UF) process was investigated and analyzed. The two membranes (organic and ceramic) with different molecular weight cut-off (MWCO) and modules (flat sheet and tubular) was used. Under optimum operation conditions, ceramic (zirconium dioxide) tubular membrane with MWCO of 50 kDa resulted in higher flux, less fouling, more turbid, higher total solid, higher polysaccharide and less aloin content. Optimum operation conditions were transmembrane pressure of 1.0 bar, feed velocity of 240 L/hr and temperature of . Volume concentration factor of aloe gel was 3.13 at permeate flux of after processing time of 1.66 hr. Aloin in fresh aloe gel by UF process was effectively removed as permeate and bioactive polysaccharide content was 2.1 times higher than that of fresh aloe gel. These results allowed a very good level of concentration degree and polysaccharide content. Thus, ultrafiltration process of this study was suitable for the concentration of fresh aloe gel though the aloe concentrate showed both the viscosity decrease and partially separation of liquid layer during storage at .
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KEYWORD
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Aloe vera gel, ultrafiltration, concentration, polysaccharide
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