Abstract
A simple and easy to handle extraction procedure based on the use of electromagnetic induction heating is described. To assess the potential, scopes, and limitations of this novel process, extraction and subsequent HPLC quantification of emodin from an hydroalcoholic extract of rhizome of Rheum palmatum (Chinese rhubarb) was selected as the reference experiment. Maceration at room temperature and by heating, ultrasound-assisted, and microwave-assisted extractions were also carried out for comparison. Results obtained with electromagnetic induction heating showed that this methodology performed largely better both in terms of time process and extraction yields.
Highlights
Conventional extraction methodologies of plants include maceration, heating, or refluxing in the presence of solvents with different polarities [1]
(85 °C from for 4 h), the same optimized conditions that we adopted for the extraction of anthraquinones ultrasound-assisted and microwave-assisted
Trend may behow electromagnetic induction heating performed much better than all other extraction methods applied
Summary
Conventional extraction methodologies of plants include maceration, heating, or refluxing in the presence of solvents with different polarities [1]. Drawbacks currently associated with such processes often include the loss of the desired secondary metabolites due to the occurrence of several side reactions like hydrolysis, air oxidation, and chemical degradation in general. These are due to the long operation time required to accomplish the above-mentioned experimental steps. The search for novel, alternative, more economic, and easy to handle procedures to accomplish plant extraction is a field of current and growing interest In this short communication, we wish to describe a simple, very rapid, and effective method based on the use of electromagnetic induction heating.
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