Comparison of microwave-assisted extraction and conventional extraction techniques for the extraction of tanshinones from Salvia miltiorrhiza bunge

2002 ◽  
Vol 12 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Xuejun Pan ◽  
Guoguang Niu ◽  
Huizhou Liu
Keyword(s):  
Salvia Miltiorrhiza ◽  
Microwave Assisted Extraction ◽  
Extraction Techniques ◽  
Salvia Miltiorrhiza Bunge ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Conventional Extraction

scholarly journals Optimization of Microwave-Assisted Extraction of Polyphenols from Lemon Myrtle: Comparison of Modern and Conventional Extraction Techniques Based on Bioactivity and Total Polyphenols in Dry Extracts

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2212
Author(s):  
Md Saifullah ◽  
Rebecca McCullum ◽  
Quan Van Vuong
Keyword(s):  
Phenolic Compounds ◽  
Antioxidant Properties ◽  
Extraction Yield ◽  
Solvent Ratio ◽  
Microwave Assisted Extraction ◽  
Extraction Techniques ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Conventional Extraction ◽  
Radiation Time

The aromatic herb lemon myrtle is a good source of polyphenols, with high antioxidant and antimicrobial capacity. In this study, the green extraction technique microwave-assisted extraction (MAE) was applied and the extraction parameters were optimized using response surface methodology (RSM) to maximize the extraction yield of phenolic compound and antioxidant properties. Then, it was compared with other popular novel and conventional extraction techniques including ultrasound-assisted extraction (UAE) and shaking water bath (SWB) to identify the most effective technique for extraction of phenolic compounds from lemon myrtle. The results showed that the MAE parameters including radiation time, power, and sample to solvent ratio had a significant influence on the extraction yield of phenolic compounds and antioxidant capacity. The optimal MAE conditions were radiation time of 6 min, microwave power of 630 W, and sample to solvent ratio of 6 g/100 mL. Under optimal conditions, MAE dry extract had similar levels of total phenolic compounds (406.67 ± 8.57 mg GAE/g DW), flavonoids (384.57 ± 2.74 mg CE/g DW), proanthocyanidins (336.54 ± 7.09 mg CE/g DW), antioxidant properties, and antibacterial properties against (Staphylococcus lugdunensis and Bacillus cereus) with the other two methods. However, MAE is eight-times quicker and requires six-times less solvent volume as compared to UAE and SWB. Therefore, MAE is recommended for the extraction of polyphenols from lemon myrtle leaf.

Microwave-Assisted Extraction of Chlorophyll from Filter Mud of Sugercane Mill and Component Analysis

2012 ◽  
Vol 518-523 ◽  
pp. 430-435 ◽  
Author(s):  
Hai Rong Guo ◽  
Shao Ying Ma ◽  
Xiao Fei Wang ◽  
Er Fang Ren ◽  
Yuan Yuan Li
Keyword(s):  
Irradiation Time ◽  
Extraction Time ◽  
Extraction Temperature ◽  
Microwave Assisted Extraction ◽  
Optimal Conditions ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Conventional Extraction ◽  
Filter Mud ◽  
Strong Absorption Peak

Microwave-assisted extraction (MAE) was used to extract chlorophylls from filter mud. Ethanol was used as the solvent. The optimal conditions for the MAE of chlorophylls were concluded from the study as the irradiation time, 50 s, the ratio of liquid to solid, 8:1 (mL/g), the extraction temperature, 40 °C, and the extraction time, 60 min. Compared with conventional extraction, the MAE of chlorophylls from the filter mud was more effective. The extraction time for MAE was 60 min with 0.277 mg/g chlorophyll yield, while conventional extraction needed 240 min with only about 0.259 mg/g chlorophyll yield. The Ultraviolet Absorption Spectra of the extracted chlorophylls showed that there was a strong absorption peak at about 663 nm. C=N, Mg-N and C-N was not seen existed from the infrared spectroscopy probably because that the mixed extracts were not purified and the chlorophyll content was less.

scholarly journals Evaluation of Microwave-Assisted Extraction for the Analysis of Polychlorinated Biphenyls and Organochlorine Pesticides in Fish

2008 ◽  
Vol 91 (5) ◽  
pp. 1124-1129 ◽  
Author(s):  
Takamitsu Otake ◽  
Yoshie Aoyagi ◽  
Masahiko Numata ◽  
Takashi Yarita
Keyword(s):  
Polychlorinated Biphenyls ◽  
Organochlorine Pesticides ◽  
Soxhlet Extraction ◽  
Liquid Extraction ◽  
Isotope Dilution Method ◽  
Dilution Method ◽  
Microwave Assisted Extraction ◽  
Extraction Techniques ◽  
Microwave Assisted ◽  
Assisted Extraction

Abstract The efficiency of microwave-assisted extraction (MAE) was evaluated for the analysis of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in fish. An isotope dilution method was used for quantification via analysis of the samples by gas chromatography and mass spectrometry. MAE solvent, temperature, and time were optimized, and observed concentrations were compared. The MAE results were also compared to those of other extraction techniques (Soxhlet extraction, pressurized liquid extraction, saponification, and homogenization). Concentrations of PCBs and OCPs obtained by MAE at 120C for 10 min were comparable to those by the other techniques. The results suggest that MAE can be used for the analysis of PCBs and OCPs in fish.

scholarly journals Microwave-Assisted Extraction of Phlorotannins from Fucus vesiculosus

Marine Drugs ◽  
2020 ◽  
Vol 18 (11) ◽  
pp. 559
Author(s):  
Sónia J. Amarante ◽  
Marcelo D. Catarino ◽  
Catarina Marçal ◽  
Artur M. S. Silva ◽  
Rita Ferreira ◽  
...  
Keyword(s):  
Xanthine Oxidase ◽  
Conventional Method ◽  
Ethanol Concentration ◽  
Fucus Vesiculosus ◽  
Metabolic Enzyme ◽  
Microwave Assisted Extraction ◽  
Pharmaceutical Drug ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Conventional Extraction

Microwave-assisted extraction (MAE) was carried out to maximize the extraction of phlorotannins from Fucus vesiculosus using a hydroethanolic mixture as a solvent, as an alternative to the conventional method with a hydroacetonic mixture. Optimal MAE conditions were set as ethanol concentration of 57% (v/v), temperature of 75 °C, and time of 5 min, which allowed a similar recovery of phlorotannins from the macroalgae compared to the conventional extraction. While the phlorotannins richness of the conventional extract was slightly superior to that of MAE (11.1 ± 1.3 vs. 9.8 ± 1.8 mg PGE/g DWextract), both extracts presented identical phlorotannins constituents, which included, among others, tetrafucol, pentafucol, hexafucol, and heptafucol structures. In addition, MAE showed a moderate capacity to scavenge ABTS•+ (IC50 of 96.0 ± 3.4 µg/mL) and to inhibit the activity of xanthine oxidase (IC50 of 23.1 ± 3.4 µg/mL) and a superior ability to control the activity of the key metabolic enzyme α-glucosidase compared to the pharmaceutical drug acarbose.

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