The traditional techniques of solvent extraction of plant material require long extraction time and have low efficiency. Moreover, many natural products are thermally unstable and may degrade during thermal extraction. Recently modern techniques (such as ultrasonication and microwave) has been shown to be an efficient non thermal extraction method. The purpose of this study was to compare three methods of extraction (soxhlet, ultrasonication and microwave assisted extraction) for Saraca asoca Roxb. (Stem bark) phenolic contents and to determine optimal conditions (solvent, time, temperature and power) for their extraction. The yields obtained by ultrasonication and microwave extraction were found to be higher than soxhlet extraction. The total phenolic contents were found to be higher in ultrasonication extraction compared to other techniques. Due to considerable saving of time and high extraction efficiency, Microwave assisted extraction and ultrasonication under specific conditions can be used successfully for extraction of phytoconstituents.
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