scholarly journals Subcritical water extraction of polyphenols from endemic Algerian plants with medicinal properties

2020 ◽  
pp. 191-206
Author(s):  
Abdelmoumen Benmerzoug ◽  
Jaroslava Svarc-Gajic ◽  
Natasa Nastic ◽  
Sofiane Guettaf ◽  
Daoud Harzallah
Keyword(s):  
Traditional Medicine ◽  
Subcritical Water ◽  
Dry Weight ◽  
Water Extraction ◽  
Extraction Time ◽  
Operational Parameters ◽  
Subcritical Water Extraction ◽  
Pressure Time ◽  
Medicinal Properties ◽  
Pharmacological Potential

Ephedra alata, Ononis angustissima, and Genista saharae are endemic Algerian plants with pharmacological potential, used for centuries in traditional medicine. Herein the efficiency of subcritical water extraction (SWE) of phenols and flavonoids from these plants was evaluated by spectrophotometric assays. The most important operational parameters of the technique (temperature, pressure, time) were optimized for each plant based on phenols yield. At defined optimal extraction conditions (140?C for E. alata, 155?C for O. angustissima and G. saharae, 50 bars, 15min), maximum contents of phenols in the extracts were 16.13, 18.33, and 21.12 mg GAE/g dry weight, for E. alata, O. angustissima, and G. saharae, respectively. Considering the safety of the used solvent, excellent yields of phenols and short extraction time, subcritical water extraction can efficiently be used in exploitation of pharmacological potentials of the studied plants.

Study on Subcritical Water Extraction of Flavonoids from Scutellaria baicalenses

2013 ◽  
Vol 662 ◽  
pp. 293-296 ◽  
Author(s):  
Yan Cheng ◽  
Jing Liu ◽  
Chang An Liu
Keyword(s):  
Subcritical Water ◽  
Extraction Yield ◽  
Water Extraction ◽  
Extraction Time ◽  
Particle Sizes ◽  
Extraction Temperature ◽  
Subcritical Water Extraction ◽  
Operation Conditions ◽  
Conventional Extraction ◽  
Total Extraction

The extraction of baicalin, baicalein, wogonin and wogonoside from Scutellaria Baicalenses was performed using subcritical water. The effects of key operation conditions by varying the temperature (110-160 °C), extraction time (10-90 min), water loadings (2.0-4.0 mL)and particle sizes (>20- <100 mesh) were evaluated. The highest extraction yields of baicalin and wogonoside were obtained at extraction temperature of 160 °C, extraction time of 60 min, water loadings of 4.0 mL and 60-100 mesh. The highest extraction yields of baicalein and wogonin were obtained at extraction temperature of 110 °C, extraction time of 10 min, water loadings of 4.0 mL and 60-100 mesh. The subcritical water extraction was compared with the conventional extraction method. The total extraction yield by SCWE was higher than those obtained using ethanol as the solvent.

Lipids Extraction from Wet and Unbroken Microalgae Chlorella vulgaris Using Subcritical Water

2019 ◽  
Vol 964 ◽  
pp. 103-108 ◽  
Author(s):  
Siti Zullaikah ◽  
Maria Christy P. Jessinia ◽  
Rinaldi ◽  
Medina Yasmin ◽  
M. Rachimoellah ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Chlorella Vulgaris ◽  
Subcritical Water ◽  
Dry Weight ◽  
High Water ◽  
Extraction Time ◽  
High Water Content ◽  
Subcritical Water Extraction ◽  
Factors Affecting ◽  
Polarity Index

Lipids extraction from wet and unbroken microalgae (Chlorella vulgaris) using subcritical water with aid of co-solvents has been investigated. Lipids extraction from wet and unbroken microalgae has a crucial role in order to eliminate dewatering and drying steps. Subcritical water is able to extract lipids from feedstock with high water content. This work was conducted to study several factors affecting in subcritical water extraction (SWE) from wet and unbroken microalgae. In this study, effect of co-solvent types (without co-solvent, chloroform, methanol, ethanol, ethyl acetate, and n-hexane) under subcritical water (microalgae = 5g (dry weight), moisture content= 94.12%, T= 160°C, P = 80 bar, t= 30 min), extraction time (15 min, 30 min, 1 h, 3 h, and 5 h), and temperature (160o C, 180o C and 200o C) on yield of lipids were investigated orderly. Yield of lipids obtained without co-solvent (water polarity index = 10.2) and with co-solvents of methanol (PI=5.1), ethanol (PI=5.2), chloroform (PI=4.1), ethyl acetate (PI=4.4), and n-hexane (PI=0.1) were 38.73%, 26.47%, 26.12%, 51.93%, 53.40%, and 25.59%, respectively compared to the yield of lipids extracted using Bligh and Dyer method. Ethyl acetate is solvent with moderate PI, therefore can extract more lipids that is also have moderate polarity. Ethyl acetate shows a good performance to extract lipids from wet and unbroken microalgae because ethyl acetate can extract broader range of lipids including neutral and polar lipids. This study also found that increasing of extraction time and temperature to extract lipids in subcritical water condition can increase yield of lipids.

scholarly journals Effects of Temperature and Extraction Time on Avocado Flesh (Persea americana) Total Phenolic Yields Using Subcritical Water Extraction

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 159
Author(s):  
Walid I. Mazyan ◽  
Ellen O’Connor ◽  
Elia Martin ◽  
Anja Vogt ◽  
Edward Charter ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Subcritical Water ◽  
Persea Americana ◽  
Water Extraction ◽  
Extraction Time ◽  
Total Phenolic ◽  
Extraction Temperature ◽  
Subcritical Water Extraction ◽  
Two Samples ◽  
The Impact

This paper investigates the optimum extraction temperature for enhanced total phenolic yields extracted from avocado fruit flesh (Persea americana) using subcritical water extraction, as well as the impact of fruit ripeness on phenol extraction efficiency. Additionally, extraction yield against extraction time was investigated for time intervals of 10 min over an overall extraction time of 30 min. The subcritical water conditions studied were 18 bar, 87 mL/min, and temperatures of 105 °C, 120 °C, and 140 °C. The total phenolic compounds content was compared for week one avocado flesh and ripe (week four) avocado flesh, with a four-week ripening period between the two samples. The results show that extracting with subcritical water at 105 °C provides the highest phenolic compounds yields of 0.11% and 0.26% by dried mass for week one and ripe fruit (week four), respectively. The experimental results also indicate that the implementation of lower extraction temperatures on week four avocado (i.e., following the selection of week one avocados and allowing them to ripen over a period of one month) enhances the phenolic compounds extraction yields by more than four times relative to the first week’s sample extract, specifically during the first 20 min of extraction.

SUBCRITICAL WATER EXTRACTION OF ESSENTIAL OILS FROMZATARIA MULTIFLORABOISS

2009 ◽  
Vol 32 (6) ◽  
pp. 804-816 ◽  
Author(s):  
M. KHAJENOORI ◽  
A. HAGHIGHI ASL ◽  
F. HORMOZI ◽  
M.H. EIKANI ◽  
H. NOORI BIDGOLI
Keyword(s):  
Essential Oils ◽  
Subcritical Water ◽  
Water Extraction ◽  
Subcritical Water Extraction

Optimization of subcritical water extraction of phenolic antioxidants from pomegranate (Punica granatum L.) peel by response surface methodology

2017 ◽  
Vol 9 (32) ◽  
pp. 4647-4656 ◽  
Author(s):  
Linlin Yan ◽  
Yungang Cao ◽  
Guangyao Zheng
Keyword(s):  
Response Surface Methodology ◽  
Subcritical Water ◽  
Punica Granatum ◽  
Water Extraction ◽  
Phenolic Antioxidants ◽  
Subcritical Water Extraction ◽  
Extraction Technology ◽  
Pomegranate Peel ◽  
Efficient Extraction ◽  
Punica Granatum L

Subcritical water extraction (SWE), a ‘green’ and efficient extraction technology, was applied to extract phenolic antioxidants from pomegranate peel in this study.

scholarly journals Structural Changes in Milled Wood Lignin (MWL) of Chinese Quince (Chaenomeles sinensis) Fruit Subjected to Subcritical Water Treatment

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 398
Author(s):  
Wen-Yue Wang ◽  
Zhao Qin ◽  
Hua-Min Liu ◽  
Xue-De Wang ◽  
Jing-Hao Gao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Water Treatment ◽  
Quantum Coherence ◽  
Structural Changes ◽  
31P Nmr ◽  
Subcritical Water ◽  
Water Extraction ◽  
Subcritical Water Extraction ◽  
Milled Wood Lignin ◽  
Chinese Quince

Subcritical water treatment has received considerable attention due to its cost effectiveness and environmentally friendly properties. In this investigation, Chinese quince fruits were submitted to subcritical water treatment (130, 150, and 170 °C), and the influence of treatments on the structure of milled wood lignin (MWL) was evaluated. Structural properties of these lignin samples (UL, L130, L150, and L170) were investigated by high-performance anion exchange chromatography (HPAEC), FT-IR, gel permeation chromatography (GPC), TGA, pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), 2D-Heteronculear Single Quantum Coherence (HSQC) -NMR, and 31P-NMR. The carbohydrate analysis showed that xylose in the samples increased significantly with higher temperature, and according to molecular weight and thermal analysis, the MWLs of the pretreated residues have higher thermal stability with increased molecular weight. The spectra of 2D-NMR and 31P-NMR demonstrated that the chemical linkages in the MWLs were mainly β-O-4′ ether bonds, β-5′ and β-β′, and the units were principally G- S- H- type with small amounts of ferulic acids; these results are consistent with the results of Py-GC/MS analysis. It is believed that understanding the structural changes in MWL caused by subcritical water treatment will contribute to understanding the mechanism of subcritical water extraction, which in turn will provide a theoretical basis for developing the technology of subcritical water extraction.

Subcritical water extraction of fucoidan from Saccharina japonica: optimization, characterization and biological studies

2017 ◽  
Vol 30 (1) ◽  
pp. 579-590 ◽  
Author(s):  
Periaswamy Sivagnanam Saravana ◽  
Adane Tilahun ◽  
Collin Gerenew ◽  
Vo Dinh Tri ◽  
Nan Hee Kim ◽  
...  
Keyword(s):  
Subcritical Water ◽  
Saccharina Japonica ◽  
Water Extraction ◽  
Subcritical Water Extraction ◽  
Biological Studies

High performance curcumin subcritical water extraction from turmeric (Curcuma longa L.)

2016 ◽  
Vol 1022 ◽  
pp. 191-198 ◽  
Author(s):  
Mohammad Valizadeh Kiamahalleh ◽  
Ghasem Najafpour-Darzi ◽  
Mostafa Rahimnejad ◽  
Ali Akbar Moghadamnia ◽  
Meisam Valizadeh Kiamahalleh
Keyword(s):  
High Performance ◽  
Subcritical Water ◽  
Curcuma Longa ◽  
Water Extraction ◽  
Subcritical Water Extraction
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