Effects of type and concentration of alginate on microencapsulation characteristics of lime essential oil (Citrus aurantifolia) produced by extrusion-dripping methods
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Abstract
The extrusion-dripping method to produce alginate-calcium beads for microencapsulation of lime oil (Citrus aurantifolia) was carried out in this study. The experimental range of alginate concentration was from 1 to 4%. Above 1% alginate concentration, viscosity was pseudoplastic behavior. The size (1.52 - 1.57 mm) and sphericity (above 95%) of the beads were maximum at alginate concentration of 2 - 3%. The extrusion-dripping method was not applicable when alginate concentration was over 3.5% due to the high viscosity resulting in low sphericity. The two types of alginates with a protein content of 9% (alg1) and 2% (alg2) had the same microencapsulation yield of 73 - 74%. However, the solid recovery of alg2 (98.99%) was much higher than that of alg1 (52.71%). This is because alg2 has a higher purity and if it is used in production, it is easier to control the content of active ingredients and reduce the amount of organic waste that is harmful to the environment compared to alg1.
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