Extraction of phenolic compounds from melissa using microwave and ultrasound

2013-01-01
In this study, extraction of phenolic compounds from melissa by microwave and ultrasound was studied. In both the microwave and ultrasound extractions, the effects of extraction time (5-20 min for microwave; 5-30 min for ultrasound) and solid-to-solvent ratio (1:10, 1:20, and 1:30 g mL(-1)) on total phenolic content (TPC) were investigated. Effects of different powers (50% and 80%) were also studied for the ultrasound extraction. As a solvent, water was used. In microwave extractions, the highest TPC of extracts (145.8 mg GAE g(-1) dry material) was obtained in 5 mm and at a 1:30 solid-to-solvent ratio. For ultrasound extraction, the conditions that gave the highest TPC (105.5 mg GAE g(-1) dry material) were 20 min with a 1:30 solid-to-solvent ratio at 50% power. Extracts obtained at the optimum conditions of microwave and ultrasound were compared with conventional extraction and maceration, respectively TPC and antioxidant activity of the extract was the highest in microwave extraction among all extraction methods. In addition, microwave reduced extraction time by 83%.
TURKISH JOURNAL OF AGRICULTURE AND FORESTRY

Suggestions

Comparison of microwave and ultrasound-assisted extraction techniques for leaching of phenolic compounds from nettle
Ince, Alev Emine; Şahin, Serpil; Şümnü, Servet Gülüm (2014-10-01)
In this study, extraction of phenolic compounds from nettle by microwave and ultrasound was studied. In both microwave and ultrasound-assisted extractions, effects of extraction time (5-20 min for microwave; 5-30 min for ultrasound) and solid to solvent ratio (1:10, 1:20, and 1:30 g/mL) on total phenolic content (TPC) were investigated. Effects of different powers (50 % and 80 %) were also studied for ultrasound-assisted extraction. In microwave-assisted extraction, the optimum TPC of the extracts (24.64 +/...
Microwave-Assisted Extraction of Phenolic Compounds from Caper
DURMAZ, Ezgi; Şümnü, Servet Gülüm; Şahin, Serpil (2015-09-02)
In this study, it was aimed to extract phenolic compounds from caper by using microwave and to compare the results with conventional extraction. For microwave-assisted extraction, power, extraction time, solid to solvent ratio, and solvent type were selected as independent variables. Dependent variables were total phenolic content (TPC), antioxidant activity, and concentration of phenolic compounds. The increase in solvent amount increased TPC. The highest TPC was obtained by using extraction conditions of ...
Usage of microwave and ultrasound in the extraction of essential oils and phenolic compounds
İnce, Alev Emine; Şahin, Serpil; Şümnü, Servet Gülüm; Department of Food Engineering (2011)
The objective of this study is to extract phenolic compounds from nettle and melissa by using microwave and ultrasound and to compare these methods with conventional extraction and maceration, respectively. Extraction of melissa essential oil was also studied. In extraction of phenolics, effects of extraction time (5-20 min for microwave; 5-30 min for ultrasound) and solid to solvent ratio (1:10, 1:20, 1:30 g/ml) on total phenolic content (TPC) were investigated for microwave and ultrasound extractions. Dif...
Characterization of extracellular beta-lactamases from penicillin G-resistant cells of Streptococcus thermophilus
Chirica, LC; Güray, Nülüfer Tülün; Gültekin, Güzin Candan; Bozoglu, F (International Association for Food Protection, 1998-07-01)
In this study, biochemical properties of two extracellular beta-lactamases produced by penicillin-resistant Streptococcus thermophilus cells were investigated. Both beta-lactamases showed specificity for penicillins but not for cephaloridins. The p-lactamases exhibited different affinities for penicillin G. The one with the higher molecular weight (F1) had a K(m) value of 3.44 mu M and a V(max), value of 8.33, mu mol/min/mg of protein, whereas the beta-lactamase with the lower molecular weight (FII) had a K...
Characterization of antioxidant and antimicrobial isolates from Quercus brantii L. extract
Nebigil, Can; Çoruh, Nursen; Department of Chemistry (2011)
This study was designed for the investigation of antioxidative, and antimicrobial properties of Quercus brantii L. (Q.brantii.) seed extract. Phenolic profile of the total extract was determined by using High Performance Liquid Chromatography (HPLC) and confirmed by High Resolution Mass Spectroscopy (HRMS). Solvent fractionation was performed to seperate bioactive compounds in total extract by using solubility differences. In comparison of fractions, ethyl acetate and diethyl ether phases have revealed high...
Citation Formats
A. E. INCE, S. Şahin, and S. G. Şümnü, “Extraction of phenolic compounds from melissa using microwave and ultrasound,” TURKISH JOURNAL OF AGRICULTURE AND FORESTRY, pp. 69–75, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41926.