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.

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 Effects of Microwave-Assisted Extraction Conditions on Antioxidant Capacity of Sweet Tea (Lithocarpus polystachyus Rehd.)

Antioxidants ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 678
Author(s):  
Ao Shang ◽  
Min Luo ◽  
Ren-You Gan ◽  
Xiao-Yu Xu ◽  
Yu Xia ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Microwave Power ◽  
Ethanol Concentration ◽  
Extraction Time ◽  
Extraction Temperature ◽  
Microwave Assisted Extraction ◽  
Optimal Conditions ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Sample Ratio

In this study, the effects of microwave-assisted extraction conditions on antioxidant capacity of sweet tea (Lithocarpus polystachyus Rehd.) were studied and the antioxidants in the extract were identified. The influences of ethanol concentration, solvent-to-sample ratio, microwave power, extraction temperature and extraction time on Trolox equivalent antioxidant capacity (TEAC) value, ferric reducing antioxidant power (FRAP) value and total phenolic content (TPC) were investigated by single-factor experiments. The response surface methodology (RSM) was used to study the interaction of three parameters which had significant influences on antioxidant capacity including ethanol concentration, solvent-to-sample ratio and extraction time. The optimal conditions for the extraction of antioxidants from sweet tea were found as follows—ethanol concentration of 58.43% (v/v), solvent-to-sample ratio of 35.39:1 mL/g, extraction time of 25.26 min, extraction temperature of 50 ℃ and microwave power of 600 W. The FRAP, TEAC and TPC values of the extract under the optimal conditions were 381.29 ± 4.42 μM Fe(II)/g dry weight (DW), 613.11 ± 9.32 μM Trolox/g DW and 135.94 ± 0.52 mg gallic acid equivalent (GAE)/g DW, respectively. In addition, the major antioxidant components in the extract were detected by high-performance liquid chromatography with diode array detection (HPLC-DAD), including phlorizin, phloretin and trilobatin. The crude extract could be used as food additives or developed into functional food for the prevention and management of oxidative stress-related diseases.

scholarly journals Optimisation of microwave-assisted extraction of flavonoids and phenolics from celery (Apium graveolens L.) leaves by response surface methodology

2016 ◽  
Vol 34 (No. 4) ◽  
pp. 341-349 ◽  
Author(s):  
Q. He ◽  
Y. Li ◽  
P. Zhang ◽  
A. Zhang ◽  
H. Wu
Keyword(s):  
Antioxidant Activity ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Ethanol Concentration ◽  
Apium Graveolens ◽  
Solvent Ratio ◽  
Microwave Assisted Extraction ◽  
Inhibition Rate ◽  
Microwave Assisted ◽  
Assisted Extraction

The conditions for microwave-assisted extraction (MAE) of total flavonoids (TF) and total phenols (TP), and antioxidant activity from celery (Apium graveolens L.) leaves by response surface methodology (RSM) were optimised. The 3-level, 3-factorial Box-Behnken design (BBD) was employed to study three main extraction conditions: microwave power (300–500 W), solid-solvent ratio (15–30 ml/g), and ethanol concentration (50–80%). It was found that microwave power of 500 W at 30 ml/g solid-solvent ratio with 75.6% (v/v) ethanol concentration was the most optimum conditions for the extraction of TF and TP from celery leaves with the consequent high antioxidant activity measured by the DPPH inhibition rate. Using the optimum extraction conditions, the extraction yields of TF and TP were 0.62 g RUE/100 g DW, 3.01 g GAE/100 g DW, respectively, and the DPPH inhibition rate was 88%. The results indicated that the nutritional quality of celery (Apium graveolens L.) leaves could be improved significantly by optimising the extraction process of MAE using response surface methodology.

scholarly journals PENGARUH KONSENTRASI ETANOL TERHADAP AKTIVITAS ANTIOKSIDAN EKSTRAK DAUN SIRIH MERAH (Piper crocatum Ruitz & Pav) MENGGUNAKAN METODE MICROWAVE ASSISTED EXTRACTION (MAE)

2019 ◽  
Vol 8 (3) ◽  
pp. 278
Author(s):  
I Gede Tirta Yasa ◽  
Nengah Kencana Putra ◽  
Anak Agung Istri Sri Wiadnyani
Keyword(s):  
Antioxidant Activity ◽  
Ethanol Concentration ◽  
Total Phenol ◽  
Total Flavonoids ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Randomized Design ◽  
Assisted Extraction ◽  
Completely Randomized Design ◽  
Test Treatment

This study was conducted to determine the effect of ethanol concentration on antioxidant activity and to obtain the highest antioxidant activity in red betel leaves extract using the MAE method. The experimental design used in this study was a completely randomized design (CRD) with an ethanol concentration treatment consisting of five levels, namely 50%, 60%, 70%, 80%, and 90%. All treatments were repeated three times to obtain 15 experimental units. The data obtained were analyzed by variance and if the treatment had significant effect followed by Duncan test. Treatment of ethanol concentration had a very significant effect (P <0.01) on yield, total phenol, total flavonoids, and antioxidant activity. The results showed that 90% ethanol concentration was the best treatment which produced a yield of 25.17%, total phenol 106.00 mg GAE / g extract, total flavonoids 46.98 mg QE / g and antioxidant activity based on IC50 at 81.61 ppm. Keywords : red betel leaves, ethanol, MAE, antioxidant activity.

Study on Technology for Obtaining Quercetin from Linifolius Conyza by Microwave-Assisted Extraction

2012 ◽  
Vol 550-553 ◽  
pp. 1817-1820
Author(s):  
Wei Guang Zhang ◽  
Ji Hong Liang ◽  
You Jie Cai
Keyword(s):  
Absorption Spectroscopy ◽  
Ethanol Concentration ◽  
Microwave Assisted Extraction ◽  
Single Factor ◽  
Solvent Concentration ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Microwave Time ◽  
Microwave Assisted Method

Determination of quercetin from Linifolius Conyza by microwave-assisted extraction and absorption spectroscopy was reported. The effects of solvent concentration, microwave time, ratio of solution to solid and microwave-assisted extraction pressure were evaluated by single factor experiments. The extraction conditions of quercetin from Linifolius Conyza by microwave -assisted method were optimized: ethanol concentration is 70 %( V/ V); microwave time is 5 minutes ; ratio of solution to solid is 45:1 and microwave-assisted extraction pressure is 500kPa . microwave - assisted extraction and absorption spectroscopy was simple and accurate with good reproducibility.

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