Extraction Of Organic Acids Research Articles

Linear polyacrylamide is highly efficient in precipitating and purifying environmental and ancient DNA

Abstract Nucleic acid extraction from complex environmental and ancient tissue material is prone to co‐extract inhibitory substances that make further molecular analysis difficult or impossible. This co‐extraction occurs in both solid‐phase and liquid‐phase/organic nucleic acid extraction protocols. Currently, the widely used method to overcome inhibition includes the addition of bovine serum albumin (BSA) to the downstream enzymatic reactions or the dilution of the nucleic acid extracts. BSA, however, seems to reduce the inhibitory effect of certain compounds only, and excessive dilution may change the original DNA composition. In this study, we introduce an innovative new method using linear polyacrylamide (LPA) to efficiently precipitate and purify nucleic acids extracted from complex environmental and ancient tissue samples in one working step. The LPA method replaces the precipitation step in classic liquid‐phase/organic extraction protocols or can be easily applied as an additional post‐extraction step on impure DNA extracts. As a proof of concept, we experimented with this method on different ancient human mummy samples (bones, soft tissues and gut contents) from different time periods (5000 BC–1800 AD), as well as on complex environmental samples (e.g. soil, activated sludge and animal faeces) known to contain inhibitory compounds. We demonstrated that LPA precipitates nucleic acids, even in an aqueous ethanol solution without the addition of chaotropic salts, resulting in the recovery of highly pure DNA from all tested samples that displayed inhibition with previously published extraction protocols. Compared to the current, most widely used silica‐based extraction method for ancient and sedimentary DNA, our LPA method resulted in comparable DNA qualities and overall DNA compositions (human endogenous content and microbial diversity). In conclusion, our LPA method with its high purifying capacity provides an important alternative to the commonly used DNA extraction protocols in the environmental and ancient DNA (aDNA) fields.

A pH-Dependent Gene Expression Enables Bacillus amyloliquefaciens MBNC to Adapt to Acid Stress.

Acid tolerance response (ATR), a process by which bacteria optimize their growth conditions for cellular functions, is a well-characterized bacterial stress response. A bacterial isolate identified, as Bacillus amyloliquefaciens MBNC, was isolated from acidic soil and studied for its acid tolerance response under several range of acidic stress conditions imposed through inorganic acid, organic acid, acetate buffer, and soil extract. The ability of the B. amyloliquefaciens MBNC to tolerate extreme acidic conditions (pH 4.5) increased when exposed to moderate-acidic pH (pH 5.5). Along with ATR, the bacterial cell density was also critical to its ability to tolerate low pH as the cells of late log phase were more tolerant to low pH stress compared to the early log phase cells. A comparative expression study of 28 genes of B. amyloliquefaciens MBNC was assessed in cells grown in neutral (pH 7.0) and acidic condition (pH 4.5) through qRT-PCR. Among the 28 genes analyzed, 24 genes showed increased expression whereas the expression of 4 genes was downregulated under acid stress indicating to the involvement of the genes in acid stress response.

Quality evaluation for Dipacus asperoides from Enshi areas and optimization extraction of saponins and organic acids and its application

Dipacus asperoides (DA), a traditional perennial herb, has distributed wildly in China, especially Wuhe Xuduan known as genuine herb. To evaluate DA’s quality, we collected ten samples from eight counties in Enshi and determined the contents of total saponins (TS) and asperosaponin VI (Asp. VI) using vanillin - glacial acetic acid - perchloric acid with spectrophotometry and ultra-high performance liquid chromatography (UPLC) separately. Subsequently, we carried out the optimization extraction of TS, Asp. VI and several organic acids such as loganic acid (LA), chlorogenic acid (ChA) and caffeic acid (CA) in the cultivated DA root grown at Hefeng and the optimized method was applied to detect the contents of TS, LA, ChA, CA and Asp. VI in flowers, leaves, stem and root of the wild and cultured DA. The results showed that DA grown at Hefeng was superior to the other samples according to the two characteristic components. In addition, grown at the same place of Hefeng, the content of Asp. VI in cultivated DA was 84% higher than that of the wild one. Moreover, leaves and flowers were rich in TS, Asp. VI and some organic acids, second only to that of root, suggesting that flowers and leaves of DA would be employed for further application.

SPECIFIC COMPOSITION OF CHICKPEA PESTS IN THE FOREST-STEPPE OF UKRAINE

The research aim is to improve the system of chickpea protection from pests, based on clarification of their specific composition and harmfulness under conditions of Forest-Steppe of Ukraine.
 In modern field crop rotations leguminous crops cultivation favors optimization of the phytosanitary condition of agrocoenosis, and new agrarian production is provided by the effective demand for grain at not only internal, but also external markets. At that climate changes with global warming and long droughty vegetation periods of leguminous crops testify to the importance of searching for new adapted crops, resistant sorts and improved technological cultivation methods of crops, especially, chickpea, essentially influencing grain economy in whole both in Ukraine and EU.
 Thus, it has been established, that ordinary chickpea (Cicer arietinum L.) is an economically, phytomedically and ecologically expedient crop from both aspects of soil fertility increase and control of the harmful organisms complex that, in its turn, it worth special attention, so sowing areas, occupied by it, are completely important. Soil-climatic conditions of Ukraine are optimal for cultivating native highly productive chickpea sorts, not inferior to foreign ones with the potential yielding capacity as 2.5–3.0 t/ha.
 The authors elucidate one of main control peculiarities of the insects-phytophagans under new agriculture systems. It is typical, that chickpea is a comparatively new crop in the Forest-steppe of Ukraine and doesn’t favor the development, propagation and number increase of specialized pests’ species. It is noted, that due to fluffing and extraction of organic acids by leaves, chickpea manifests protective properties as to pests of leaves and generative organs. But chickpea is damaged by polyphagans with harvest losses in several variants up to 50% that testifies to the elaboration topicality of modern system of crops protection from phytophagans at resource-saving cultivation technologies

The Feasibility of Emulsion Liquid Membrane for the Extraction of Organic Acids from Wastewater

The separation of hazardous organic acid pollutants such as phenol and carboxylic acids from aqueous waste streams released from industries is important and essential for environmental pollution. Acetic acid, benzoic acid, and phenol individually extracted from their aqueous solutions using emulsion liquid membranes prepared with kerosene as a membrane phase, Span 80 as a surfactant and NaOH as a stripping agent in the inner phase of W/O emulsions. Experiments have been performed to study the effect of volume ratio of membrane phase to internal phase (VM/VI), stripping phase concentration in the internal phase, agitation speed of feed solution, and volume ratio of emulsion phase to feed phase (VE/VF) on the organic acid extraction rates. More than 98% of benzoic acid and phenol can be extracted in less than 5 minutes, acetic can also be extracted but at much slower rates. Comparison of the extraction rates of organic acid indicates that benzoic acid and phenol are extracted more rapidly than that of acetic acid because the distribution coefficient (m) of benzoic acid and phenol is much larger than that of acetic acid due to their ability to dissolve in the membrane phase. The effective diffusivities indicate that the mobility of these compounds in the membrane phase obeys the following order: benzoic acid > acetic acid > phenol.

Design of Intelligent Network to Predicate Phenol Removal from Waste Water by Emulsion Liquid Membrane

This research introduced Intelligent Network's proposed design for predicting efficiency in the removal of phenol from wastewater by liquid membrane emulsion. In the inner phase of W / O emulsions, phenol extraction from an aqueous solution was investigated using emulsion liquid membrane prepared with kerosene as a membrane phase, Span 80 as a surfactant, and NaOH as a stripping agent. Experiments were conducted to investigate the effect of three emulsion composition variables, namely: surfactant concentration, membrane phase to-internal (VM / VI) volume ratio, and removal phase concentration in the internal phase, and two process parameters, feed phase agitation speed at organic acid extraction rates, and emulsion-to-feed volume ratio (VE / VF). More than 98% of phenol can be extracted in less than 5 minutes. This article describes compares the performance of different learning algorithms such as GD, RB, GDM, GDX, CG, and LM to predict the efficiency of phenol removal from wastewater through the liquid emulsion membrane. The proposed neural network consisted of (7, 11, 1) neurons in the input , hidden and output layers respectively feed forward ANN with various types of back propagation training algorithms were developed to model the emulsion liquid membrane removal of phenols. The values predicted for the neural network model are found in close agreement with the results of the batch experiment using MATLAB program with a correlation coefficient ( R2) of 0.999 and Mean Squared Error (MSE) of 0.004.

An ionic covalent organic framework for rapid extraction of polar organic acids from environmental waters.

An ionic covalent organic framework (Fe3O4@EB-TFB-iCOF) as a polar adsorbent was synthesized and characterized. It was applied in the magnetic solid phase extraction (MSPE) of four polar organic acids, namely, 2-(2,4,5-trichlorophenoxy)propionic acid, 2-methyl-4-chlorophenoxy acetic acid, naphthyloxyacetic acid, and naphthylacetic acid. The organic acids were detected by high performance liquid chromatography-ultraviolet analysis (HPLC-UV). A method for the determination of organic acids based on MSPE-HPLC-UV was established. The method shows good linear regression (R2≥ 0.9950), high precision (1.53-3.80%, n = 6), and low detection limit (0.10-0.49 ng mL-1). The recovery rate of environmental water samples ranges from 73.3% to 101.0%. This method provides a possibility for high sensitivity analysis of polar organic acids.

Effect of Supplementing Probiotic, Organic Acid and Herbal Extract (PhytoGrow) on Performance, Egg Quality and Gut Microbiota in White Leghorn Layers

Effect of Supplementing Probiotic, Organic Acid and Herbal Extract (PhytoGrow) on Performance, Egg Quality and Gut Microbiota in White Leghorn Layers

Ultrasonic Intensification of Mass Transfer in Organic Acid Extraction

The mechanism of ultrasonic extraction was discovered and analyzed in detail for the liquid membrane technique from the consideration of the specific features of the radial vibrations of a droplet of the dispersed phase placed into an immiscible continuous phase subjected to ultrasonic irradiation. Analytical formulas were derived for the rate of mass transfer as a function of the amplitude of acoustic pressure oscillations and the time of ultrasonic treatment of an extraction system. Conditions for achieving the maximum efficiency of the extraction of a substance under the stimulating effect of ultrasound were analyzed. A nonlinear equation was derived for the radial vibrations of a spherical droplet of the dispersed phase in an immiscible continuous phase under forcing in the form of acoustic pressure periodically changing with time. Experimental study of the dependence of sulfosalicylic acid distribution on time in an aqueous two-phase system with ultrasound shows good agreement of experimental results with the calculations performed.

Ionic liquid-assisted biphasic systems for downstream processing of fermentative enzymes and organic acids

AbstractRoom-temperature ionic liquids (ILs) represent molten salts entirely consisting of ions, usually a charge-stabilized organic cation and an inorganic or organic anion. ILs are liquids at ambient temperature but possess characteristics unusual for the common liquid solvents, such as negligible vapor pressure, high thermal stability and most over the ability to mix and match libraries of cations and anions in order to acquire desirable physical and chemical properties [1]. The opportunity to obtain tunable density, viscosity, polarity and miscibility with common molecular liquids gave rise to a variety of applications of the ILs [2] as environmentally benign solvents, extractants or auxiliaries. In particular, numbers of innovations in the methods for recovery and purification of biologically derived compounds involve ILs used solo or partnered with other liquids in biphasic systems [3,4,5]. It should be noted that the ILs are not intrinsically greener than the traditional solvents, given that their production is usually more resource-demanding, but the inherent potential for recycling and reuse, and for prevention of chemical accidents gives the ILs advantages ahead.The present chapter provides a state-of-the-art overview on the basic applications of the ILs in biphasic systems aimed at downstream processing of valuable fermentative products, enzymes and organic acids. Main industrially important enzymes, lipases and carbohydrases, are considered and a description of the IL-assisted aqueous biphasic systems (ABS) and the results obtained in view of enzyme yield and purity is made. ILs serve different functions in the ABS, main phase-segregating constituents (mostly in the IL/salt ABS) or adjuvants to the polymer/salt ABS. Enzyme isolation from the contaminant proteins present in the feedstock can be carried out either in the IL-rich or in the salt-rich phase of the ABS and for the reader’s convenience the two options are described separately. Discussion on the factors and parameters affecting the enzyme partitioning in the ABS with ILs guides the reader through the ways by which the interactions between the IL and the enzyme can be manipulated in favor of the enzyme purification through the choice of the ABS composition (IL, salt, pH) and the role of the water content and the IL-rich phase structure.The second part of the chapter is dedicated to the recovery of fermentative organic acids. Mostly hydrophobic ILs have been engaged in the studies and the biphasic systems thereof are summarized. The systems are evaluated by the extraction efficiency and partition coefficient obtained. Factors and parameters affecting the extraction of organic acids by ILs are highlighted in a way to unravel the extraction mechanism. The choice of IL and pH determines the reactive mechanism and the ion exchange, while the water content and the IL phase structure play roles in physical extraction. Procedures undertaken to enhance the efficiency and to intensify the process of extraction are also looked over.Finally, the experimental holes that need fill up in the future studies are marked. According to the author’s opinion an intense research with hydrophobic ILs is suggested as these ILs have been proved milder to the biological structures (both the microbial producer and the enzyme product), more effective in the organic acid recovery and suitable to perform “in situ” extraction. Extractive fermentation entails validation of ecological and toxicological characteristics of the ILs. The protocols for re-extraction of fermentative products separated by IL-assisted biphasic systems should be clearly settled along with the methods for ILs recycling and reuse. Novel more flexible approaches to process intensification can be implemented in order to adopt the separation by biphasic systems for use in industry.

Microscopic Studies, Mineral composition and Bioactivity of Vitex madiensis Oliv. (Lamiaceae)

Ethanol and organic acid extracts from the leaves of Vitex madiensis Oliv. were evaluated for their antihelminthic activity using the animal model of Benhamia rosea and B. itoleisis (Kinshasa/DRC earthworms), antibacterial activity and antioxidant activity. Different concentrations (5 mg/mL, 2.5 mg/mL, 1.25 mg/mL and 0.625 mg/mL) of standard Albendazole (positive control) and sample solutions (organic acid extracts and ethanol extracts) were used for this study which involved the determination of the paralysis time (vermifuge) and mortality time (vermicidal activity) of the worms. The presence of different secondary metabolites was determined by the thin layer chromatography. The results obtained showed that the ethanolic extract and the organic acid extracts showed significant antihelminthic activity. Microscopic examination of the parts used revealed the presence of various histological elements. Its phytochemical profile remains dominated by various secondary metabolites such as coumarins, anthraquinones, flavonoids, phenolic acids and terpenoids. The mineral composition was determined by inductively coupled argon plasma optical emission spectrometry (ICP-EOS) showed the abundance of various elements, namely calcium, iron, potassium, selenium, sodium, magnesium, manganese, nickel, phosphorus, cobalt, copper, barium and zinc in this plant. The antibacterial activity of the extracts of this plant was weak against the bacterial strains tested. The organic acid and ethanol extracts showed interesting antioxidant activity. The leaves extracts of Vitex madiensis Oliv. showed good antihelminthic, antibacterial and antioxidant activities related to their phytochemical compositions. All these results constitute scientific evidence validating the use of this medicinal plant for the management of parasitic infections of small ruminants in the Democratic Republic of the Congo.

Hydrolysis of sorghum starch to glucose using organic acid catalyst from rosella flower extract (Hibiscus sabdariffa L.)

Highly starch content in sorghum seed has a high potential raw material for the sorghum fluor to be a raw material of liquid sugar known as glucose syrup. The syrup is usually produced through enzymatically or chemically hydrolysis using a strong acid. In this study, sorghum starch is hydrolyzed chemically using a catalyst of organic acids extracted from roselle flower (Hibiscus sabdariffa L.). The goal of the study is to produce glucose syrup free from chemical agents so as generally recognized as safe (GRAS). Rosella flowers are known to contain high amounts of organic acids such as citric acid, malic acid, tartaric acid, oxalic acid, and hibiscus acid. Apart from having natural acid content, rosella flowers also contain vitamins (ascorbic acid) and are rich in natural red pigment dyes from the anthocyanins that can be an added value for the glucose syrup products. Organic acid extraction of dried rosella flowers was carried out at a temperature of 100°C for 30 minutes in a water bath and filtered. The resulting acid extract then determined the value of the total titrated acid (TTA) by the acid-base titration method. Sorghum starch is prepared by mixing sorghum flour with distilled water and then cooled at 4°C for 12 hours. Starch is obtained from the dried filtrate to obtain a water content of <14%. The starch hydrolysis process with rosella flower extract was carried out in several variations, namely the hydrolysis time of 1 - 4 hours, the TTA concentration of rosella 4 - 16%. Meanwhile, the temperature and stirring speed were fixed at 96°C and 200 rpm. The resulting glucose levels were analyzed by the spectrophotometric method. From this research, the result shows that the best sorghum starch hydrolysis condition was obtained at the addition of 16% acid extract for 180 minutes which gave 13.83% of glucose yield

Effect of Supplementing Probiotic, Organic Acid and Herbal Extract (PhytoGrow) on Performance, Egg Quality and Gut Microbiota in White Leghorn Layers

Effect of Supplementing Probiotic, Organic Acid and Herbal Extract (PhytoGrow) on Performance, Egg Quality and Gut Microbiota in White Leghorn Layers

Method development and validation for the quantification of organic acids in microbial samples using anionic exchange solid-phase extraction and gas chromatography-mass spectrometry

Organic acids play a key role in central metabolic functions of organisms, are crucial for understanding regulatory processes and are ubiquitous inside the cell. Therefore, quantification of these compounds provides a valuable approach for studying dynamics of metabolic processes, in particular when the organism faces changing environmental conditions. However, the extraction and analysis of organic acids can be challenging and validated methods available in this field are limited. In this study, we developed a method for the extraction and quantification of organic acids from microbial samples based on solid-phase extraction on a strong anionic exchange cartridge and gas chromatographic-mass spectrometric analysis. Full method validation was conducted to determine quality parameters of the new method. Recoveries for 12 of the 15 aromatic and aliphatic acids were between 100 and 111% and detection limits between 3 and 272 ng/mL. The ranges for the regression coefficients and process standard deviations for these compound classes were 0.9874–0.9994 and 0.04–0.69 μg/mL, respectively. Limitations were encountered when targeting aliphatic acids with hydroxy, oxo or enol ester functions. Finally, we demonstrated the applicability of the method on cell extracts of the bacterium Escherichia coli and the dinoflagellate Prorocentrum minimum.Graphical abstract

Subcritical water extraction of organic acids from chicken manure.

Chicken manure waste has a wide range of organic substances and mineral elements. This enriched source has stimulated great scientific interest in finding cleaner and more environmentally benign nutrient recovery options. This study aimed to determine an effective and eco-friendly method (i.e. subcritical water extraction) for processing fresh poultry manure. The high content of total organic carbon, including humic acids carbon and fulvic acids carbon, in extract was found to release under subcritical conditions. The organic compounds obtained by extraction with subcritical water correspond to humic acid in composition because of the presence in the sample of all the functional groups: polymer bonded by molecular hydrogen bond (3400 cm-1 ), the presence of CH2 and CH3 groups (2870 cm-1 ), the presence of carboxyl groups (1720 cm-1 ) and quinones (1640-1680 cm-1 ). The solid phase left over was characterized by a high content of organic carbon, phosphorus, potassium, and microelements. The maximum extraction of humic acid and fulvic acid carbon was found between 210 and 250 °C at a pressure of 50-60 atm, and the content was a maximum of 3647.2 × 10-6 g kg-1 at an extraction temperature of 250 °C. Given the high content of humic acid found in the extracted medium, the proposed subcritical extraction opens up new opportunities for nutrients recovery in the poultry industry. © 2020 Society of Chemical Industry.

Electrodialytic Processes: Market Overview, Membrane Phenomena, Recent Developments and Sustainable Strategies.

In the context of preserving and improving human health, electrodialytic processes are very promising perspectives. Indeed, they allow the treatment of water, preservation of food products, production of bioactive compounds, extraction of organic acids, and recovery of energy from natural and wastewaters without major environmental impact. Hence, the aim of the present review is to give a global portrait of the most recent developments in electrodialytic membrane phenomena and their uses in sustainable strategies. It has appeared that new knowledge on pulsed electric fields, electroconvective vortices, overlimiting conditions and reversal modes as well as recent demonstrations of their applications are currently boosting the interest for electrodialytic processes. However, the hurdles are still high when dealing with scale-ups and real-life conditions. Furthermore, looking at the recent research trends, potable water and wastewater treatment as well as the production of value-added bioactive products in a circular economy will probably be the main applications to be developed and improved. All these processes, taking into account their principles and specificities, can be used for specific eco-efficient applications. However, to prove the sustainability of such process strategies, more life cycle assessments will be necessary to convince people of the merits of coupling these technologies.

Rapid Quantification of Urinary Organic Acids by HPLC Mass Spectrometry to Assess Nutritional Individuality in Chinese Children.

A urinary organic acids profile can be utilized as an effective screening tool for analyzing abnormality of nutrient metabolism. By using these metabolic markers in conjunction with one another, it helps in understanding how individual nutrient metabolism is executed and to determine where there may be imbalances in the metabolic cycle. In this study, we developed a rapid quantification method of 20 urinary organic acids by HPLC-mass spectrometry. A pre-analytical process of organic acid extraction from a urine sample is crucial in this methodology. The process was accomplished by liquid-liquid extraction followed by strong anion exchange. Compared with previous methods, this method greatly reduces the analysis time and allows for the simultaneous quantification of 20 organic acids within 10 min for the first time. This methodology enabled us to analyze urine samples collected from 34 Chinese children. The abnormalities of some urinary organic acids were found in this group, which revealed evidence of functional inadequacy of specific nutrients. The preliminary data in this study confirmed the suitability of the method for rapid and accurate quantification of the target organic acids in urine samples.

Remediation of heavy metal contaminated soils by organic acid extraction and electrochemical adsorption

Remediation of heavy metal contaminated soils remains a global challenge. Here, low-molecular-weight organic acids were used to extract Cu and Zn from polluted soils, and the extracted heavy metals were subsequently adsorbed by activated carbon electrodes. The electrochemical adsorption mechanism as well as the influence of pH, organic acid type and voltage were investigated, and the soil remediation effect was further evaluated by the cultivation of rape. After extraction by citrate at initial pH 8.3 and electrochemical adsorption at 0.9 V for 7 d, the concentrations of total and bioavailable Cu in soils decreased from 1090 to 281 to 391 and 52 mg kg−1, and those of Zn decreased from 262 to 39 to 208 and 30 mg kg−1, respectively. Cu and Zn ions were mainly electrochemically adsorbed on the carbon cathode and anode, respectively, resulting in decreases of their concentrations to below 1 mg L−1 in the leachate. The presence of organic acids improved the remediation performance in the order of citrate > oxalate > acetate. The decrease in the initial pH of citrate solution enhanced the removal rate of Zn, while seemed to have no effect on that of Cu. The removal capacity for heavy metals decreased with decreasing cell voltage from 0.9 to 0.3 V. In the rape cultivation experiment, the Cu and Zn contents in shoot and root were decreased by more than 50%, validating the soil remediation effect. The present work proposes a facile method for heavy metal removal from contaminated soils.

Phase transfer catalyst-assisted reversed-phase dispersive liquid–liquid microextraction for the rapid determination of organic acids in Fischer-Tropsch oil products

A method prior to using high-performance liquid chromatography (HPLC), named phase transfer catalyst-assisted reversed-phase dispersive liquid–liquid microextraction (PTC-RP-DLLME), was developed for the rapid determination of organic acids in Fischer-Tropsch synthesis (FTS) oil products. This method used sodium hydroxide solution and tetrabutylammonium bromide (TBAB) as an extractant and a disperser respectively, in which the TBAB promoted the dispersion of aqueous NaOH solutions in the organic product, and acted as a hydrogen bond receptor to enhance the extraction of organic acids via hydrogen bond interactions. Under the optimized conditions, the calibration curves in the range of 0.1–30 μg mL−1 showed correlation coefficients (r) of 0.998–0.999. Detection limits (S/N = 3) were ranged from 1.0 to 3.5 ng mL−1. The relative standard deviations of intra-day and inter-day repeatability were in the range of 2.9–5.8 % and 4.1–6.7%, respectively. The recoveries ranged from 85.4% to 105.9%. This developed method was employed for the analysis of organic acids in 6 types of oil products. This work provides an efficient and rapid pretreatment method for acid concentration prior to HPLC, and therefore saves time and cost for the quantitative analysis of FTS oil products. Moreover, precise analysis by application of this method is fairly beneficial to the FT catalyst improvement and industrial equipment material selection, and is rather significant for the proper design of the downstream processing/purification system.

Extraction of adipic, levulinic and succinic acids from water using TOPO-based deep eutectic solvents

Organic acids are extremely useful as starting materials for chemical industry. Adipic, levulinic and succinic acids, are becoming in such interesting alternatives to petrochemical feedstock in the production of a wide range of compounds in many different industries such as polymer, pharmaceutical or food manufacture. The extraction process of these acids often use organic solvents which are environmental hazardous. In this paper, two hydrophobic trioctylphosphine oxide (TOPO)-based deep eutectic solvents (DESs) were studied as alternative solvents for the organic acid extraction. They were prepared and analysed using differential scanning calorimetry (DSC) and nuclear magnetic resonance (NMR) to confirm the DESs formation and to check their stability in water. Density, speed of sound, refractive index and viscosity of the prepared TOPO-based DESs were determined from 293.15 to 343.15 K. Even though DES used to extract adipic, levulinic or succinic acid demonstrate high capacity to remove the above mentioned acids from aqueous solutions, TOPO is still exhibiting the best extraction capacity.