ObtainingAntioxidants from Botanic Matrices Applying Novel Extraction Techniques

Abstract

Botanic matrices are abundant sources of antioxidants which have the capacity to avoid the lipid o xidation of food and present remarkab le health benefits. The natural antioxidants might be obtained applying many extraction techniques. Satisfactory results of obtaining extracts with antio xidant properties and high yields using modern extraction techniques are shown by recent studies. The selection of the suitable technique depends on the desired class of substances to be extracted. In this overview, the advances reached in scientific researches involving natural antio xidants are presented. The advantages and potential applicat ions of four novel ext raction techniques: Supercritical Flu id Ext raction, Pressurized Liquid Extraction, M icro wave Assisted Extraction and Ultrasound Assisted Extraction are discussed, considering the characteristics of the target compounds. These techniques reduce the solvent consumption and abridge the extraction time. Consequently, the process productivity is increased.

Optimization of microwave‐assisted extraction and pressurized liquid extraction of phenolic compounds from Moringa oleifera leaves by multiresponse surface methodology

“…The type of solvent used for the extractions was one of the most thoroughly investigated factors. Thus, ethanol and water are the most appropriate solvents used in the food and nutraceutical industry, because they are easily removed from the final product and they increase the efficiency of the extraction of phenolic acids and flavonoids . Ethanol effectively extracts flavonoids and their glycosides, catechols, and tannins from raw plant materials but the solubility of these compounds can be enhanced by using a mixed solvent over a limited compositional range .…”

Qualitative and Quantitative Analysis of Polyphenols in Lamiaceae Plants—A Review

“…Plant bioactives can be recovered with several conventional extraction methods, including maceration, distillation, Soxhlet extraction [ 26 ], reflux extraction [ 27 ], and low pressure solvent extraction (LPSE) [ 28 ]. However, these techniques are labor-intensive as they require extended extraction times, large quantities of solvents, and they commonly result in low extraction yields and reduced selectivity [ 29 , 30 , 31 , 32 ]. In parallel, the extracts may be subjected to excessive oxygen (O 2 ), heat and light, leading to their subsequent degradation [ 27 , 29 ].…”

“…Several novel extraction methods have been established for the recovery of phenolics from plant materials, including microwave-assisted extraction (MAE), supercritical fluid extraction (SFE) [ 32 , 34 ], ultrasound-assisted extraction (UAE) [ 34 ] and accelerated solvent extraction (ASE) [ 29 ]. In recent years, the use of MAE has gained considerable popularity due to its benefits of diminution of extraction time, reduced cost, sustainability, as well as potential for automation or on-line connection to analytical instrumentation [ 34 , 35 , 36 ].…”

Carbon Dioxide Use in High-Pressure Extraction Processes

“…The extraction/separation processes applied to solid matrix using carbon dioxide as solvent are the most studied supercritical processes in the search for new natural products that have biological activity, according to numerous applications described in the literature [1,[4][5][6][11][12][13][14][15][16][17][18].…”