Abstract
The microwave technology commonly called microwave-assisted extraction (MAE) is a viable alternative for obtaining bioactive compounds. In this chapter, we evaluated the extraction of phenolic compounds from Coriandrum sativum L. (cilantro) and Amaranthus hybridus L. (quelite) by microwave technology. The influence of the irradiation time and solvent concentration on the yield of phenolic compounds was studied. The best extraction conditions between plants were for C. sativum, 3min of irradiation time with 25% aqueous ethanol (v/v) and for A. hybridus, 9min of irradiation with 50% aqueous ethanol (v/v) obtaining yields of 5.70 and 1.55mg gallic acid (GAE) g−1 per plant, respectively. Besides the antioxidant activity of the extracts obtained, the best extraction conditions were evaluated by DPPH radical-scavenging assay. In conclusion, the microwave technology presents some advantages such as required short times and small amounts of solvents in contrast with conventional extraction methods.
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