Liquid-liquid extraction
It is known as solvent extraction. The principle of this method is based on a mass transfer operation. Plants are made into liquid form and the solution (the feed) is contacted with a solvent which is an immiscible liquid. Two layers of streams were formed and separated the desired extracted (pigments) and undesired components. However, the limitation of this method is cannot be applied in non-aqueous systems.
Generally, this method is called as leaching process including two steps which are contacting a solid (blended plants) with a solvent and separating the solvent phase and solid residual. The solvent phase contains the desired component such as anthocyanin and chlorophyll. Firstly, the plant blended solution is dissolved in a solvent which able to dissolve the desired component. Followed by using a filter to separate the solvent phase (extract) and solid residual.
Soxhlet extraction
This is a new extracted method created by von Soxhlet in 1879 which is more cost saving method because the solvent that used to extract the desired compound can be recycle. This method widely used by industries because it is able to extract a desired compound has limited solubility or insoluble in that solvent. In fact, the principle of this method is similar with tradition leading method.
This is a new extracted method created by von Soxhlet in 1879 which is more cost saving method because the solvent that used to extract the desired compound can be recycle. This method widely used by industries because it is able to extract a desired compound has limited solubility or insoluble in that solvent. In fact, the principle of this method is similar with tradition leading method.
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| Process of Soxhlet Extraction [6]. |
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