scholarly journals Comparison of extraction efficiency and selectivity between low‐temperature pressurized microwave‐assisted extraction and prolonged maceration

2020 ◽  
Vol 353 (10) ◽  
pp. 2000147
Author(s):  
Nelson E. Masota ◽  
Gerd Vogg ◽  
Eberhard Heller ◽  
Ulrike Holzgrabe
Keyword(s):  
Low Temperature ◽  
Extraction Efficiency ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction

Optimisation of microwave-assisted extraction from Phyllanthus amarus for phenolic compounds-enriched extracts and antioxidant capacity

2016 ◽  
Vol 70 (6) ◽  
Author(s):  
Van T. Nguyen ◽  
Michael C. Bowyer ◽  
Ian A. van Altena ◽  
Christopher J. Scarlett
Keyword(s):  
Phenolic Compounds ◽  
Antioxidant Capacity ◽  
Bioactive Compounds ◽  
Pharmacological Activity ◽  
Extraction Efficiency ◽  
Phyllanthus Amarus ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Extraction Parameters

Abstractis known as a healing herb which has traditionally been used in the treatment of various diseases such as hepatitis, diabetes and cancer. The extraction parameters have great effects on the extraction efficiency of bioactive compounds and pharmacological activity of the extracts. This study sought to optimise the microwave-assisted extraction parameters for phenolic compounds-enriched extracts and antioxidant capacity from

Pressurized Microwave-Assisted Extraction of Total Isoflavones from Pueraria Lobata

2011 ◽  
Vol 236-238 ◽  
pp. 2651-2654
Author(s):  
Bo Quan Jiang ◽  
Shi Wen Lan ◽  
Yu De Liu ◽  
Jiang Nan Zeng
Keyword(s):  
Mass Concentration ◽  
Extraction Efficiency ◽  
Pueraria Lobata ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Experiment Method ◽  
Surface Test ◽  
The Mathematical Model ◽  
Single Factor Experiment

The single factor experiment method was used to investigate the effects of microwave power（P）, extraction pressure(p), alcohol mass concentration（x%）, ratio of liquid to solid (l/s), pre-immersed time(τ) and particle size(d) on extraction efficiency of total isoflavones from pueraria lobata by pressurized microwave-assisted extraction technique. Based on the above the Design-Expert 6.0 software was used to carry out a response surface test with three factors (ratio of liquid to solid, pressure and alcohol mass concentration) to optimize the technical conditions and establish the mathematical model. The results show that the optimum technical conditions are: P =700w, p =132.61kPa, x =51.2%, l / s =10.45,τ=2h，d = 80 meshes. Under these conditions the extraction efficiency reaches 98.75% which is 23.5% higher than that by microwave-assisted extraction at atmospheric pressure. The established model (second multivariate regression equation) is consistent with the experiment and can predict the extraction efficiency of the total isoflavones under different technical conditions.

scholarly journals Microwave Assisted Extraction of Papaya Leaves and Investigation on Antioxidant Activity

2021 ◽  
pp. 115-122
Author(s):  
. Shobitharai ◽  
Divya Jyothi ◽  
Swathi Das ◽  
C. M. Sumayya ◽  
A. Thabsheer
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Extraction Efficiency ◽  
Phenolic Content ◽  
Total Phenolic ◽  
Phytochemical Analysis ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Conventional Extraction

Microwave assisted extraction (MAE) has gained lot of attention due to its advantages such as less solvent consumption, short time period, higher extraction efficiency, therefore serves as better alternative for conventional extraction methods of plant materials. Plant phenolic compounds are important constituents responsible for reducing the oxidative stress that induces tissue damage which is the one of the major causative factors associated with the chronic disease. Papaya plant is a medicinal plant which became popular for the treatment of dengue fever due to its property. Considering the current medicinal importance of the papaya plant, the present study was aimed at microwave assisted extraction of phenolic content from papaya leaf using ethanol, water as solvent and investigate their antioxidant potential. In order to compare the extraction efficiency of phenolic compounds, conventional extraction and microwave assisted extraction method was used to prepare the extracts. Then extracts were subjected to preliminary phytochemical analysis followed by the estimation of total phenolic content by using Folin-Ciocalteu method. Antioxidant activity was investigated by 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The alcoholic and aqueous extracts of papaya leaf showed the presence of steroids, alkaloids, saponins, carbohydrates, phenolic compounds by preliminary phytochemical analysis. FTIR spectrum of both aqueous and ethanolic extract showed characteristic peak at 3314.62 cm-1, 1635 cm-1 which provide evidence for presence of phenolic compounds. The total phenolic content of the alcoholic and aqueous leaf extracts from MAE was found to be 43.58mg and 80.58 mg/g papaya leaf powder of the Gallic acid equivalent (GAE), respectively. Aqueous solvent was found to be suitable for extraction of phenolic content from papaya leaf and Microwave assisted extracts showed higher phenolic content and therefore potential antioxidant activity. Therefore, papaya leaf is a good candidate to be used as a natural antioxidant for the treatment of various diseases.

scholarly journals Comparison of Refluxing, Ultrasonic- and Microwave-Assisted Extraction of Dihydromyricetin from Ampelopsis grossedentata

2008 ◽  
Vol 91 (6) ◽  
pp. 1278-1283 ◽  
Author(s):  
Hui Li ◽  
Yanan Li ◽  
Yongkang Zhang ◽  
Hui Shi ◽  
Wenbin Hu ◽  
...  
Keyword(s):  
High Performance ◽  
Large Scale ◽  
Extraction Efficiency ◽  
Chemical Constituents ◽  
Microwave Assisted Extraction ◽  
Extraction Solvent ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Ultrasonic Assisted ◽  
Ampelopsis Grossedentata

Abstract Three techniquesrefluxing extraction (RE), ultrasonic-assisted extraction (UAE), microwave-assisted extraction (MAE)for extraction of dihydromyricetin from Ampelopsis grossedentata, family Vitaceae, were evaluated. A 70 methanolwater solution was used as extraction solvent, and extracts obtained were analyzed by high-performance liquid chromatography (HPLC). Results showed that the MAE method was the most efficient in the shortest time, followed by RE and UAE. Maximum extraction efficiency of dihydromyricetin was obtained by using the MAE technique, which needs only 10 min, whereas UAE and RE require 40 and 300 min, respectively, to gain higher extraction efficiency of dihydromyricetin. The time needed for MAE was 30 times less than that needed for RE. Extracts obtained by using different methods were shown by HPLC analysis to possess similar chemical constituents, and extraction reproducibility was satisfactory for these techniques. Compared with UAE and RE, the MAE is a better alternative extraction technique for large-scale speedy extraction of dihydromyricetin from this plant.

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