WITHDRAWN: An eco-extraction procedure for solvent free extraction of plant phenolics using microwave hydro diffusion and gravity (MHG) model

Abstract

The current work exemplifies a strategic implementation of blended mode microwaving in the MHG model for the solvent-free extraction of phenolics from the leaves of the plant Medicago polymorpha. Blended mode comprises of a mix of 510W microwave power level for 5 min, followed by 340W exposure for 5 min and then finally prolonged exposure of 170W in cycles of 5 min each till the end point is reached. The extraction performance was assessed by the total phenolic and flavonoid contents which was found to be 65.1 and 66.7 mg GAE/QE per g of dried extract respectively, for the extract obtained from MHG (blended mode). Soxhlet extract on the other hand could produce 45.4 and 52.4 mg GAE/QE per g of dried extract. In total 18 phenolic principles were detected out of which 09 compounds showed more than 50% depletion in the extract obtained from Soxhlet. In addition to this extract obtained from MHG showed better stability as only 18.9% degradation was reported in a span of 60 days when compared to 64.1% for the Soxhlet extract for the same length of time. Improved thermal stability and antioxidant activity were the other add on features for the extract obtained through MHG (blended mode). Such technologies embraces environment and progresses sustainably.