Microwave-assisted extraction

Unlike conventional heating techniques based on conduction or convection, the use of microwaves involves direct interaction between electromagnetic radiation and matter. Microwave heating of a product thus results from the conversion of electromagnetic wave energy into heat within the material. This particular energy transfer induces an equally particular material transfer, the mechanisms of which differ significantly from those of traditional solid-liquid extraction.

The efficiency (in terms of yield or extraction kinetics) and selectivity (in terms of product purity) of microwave-assisted extraction processes are a corollary of these particular conditions of material and energy transfer.

Microwave-assisted extraction processes take just a few minutes. In most cases, yields are comparable to those obtained by conventional extraction processes. When yields are lower, this is usually a reflection of the selectivity of the process, leading to higher extract purity.