Formation and structure evolution of starch nanoplatelets by deep eutectic solvent of choline chloride/oxalic acid dihydrate treatment

This study aimed to resolve the issue of the lack of detailed understanding of the effect of initial lignin content in hardwood kraft pulps on pulp delignification by deep eutectic solvents. The authors used Kappa number of the concerned pulp, intrinsic viscosity, and selectivity and efficiency of delignification as the parameters of the effect. The pulp (50 g oven dry pulp) was treated with four different DESs systems based on choline chloride with lactic acid (1:9), oxalic acid (1:1), malic acid (1:1), and system alanine:lactic acid (1:9); the results were compared to those reached by oxygen delignification. The results showed that the pulp with a higher initial lignin content had a greater fraction of easily removed lignin fragments.

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Determination of Selenium and Arsenic Ions in Edible Mushroom Samples by Novel Chloride–Oxalic Acid Deep Eutectic Solvent Extraction Using Graphite Furnace-Atomic Absorption Spectrometry

Journal of AOAC International ◽

10.5740/jaoacint.17-0238 ◽

2018 ◽

Vol 101 (2) ◽

pp. 593-600 ◽

Cited By ~ 3

Author(s):

Rizwan Ali Zounr ◽

Mustafa Tuzen ◽

Muhammad Yar Khuhawar

Keyword(s):

Oxalic Acid ◽

Atomic Absorption Spectrometry ◽

Atomic Absorption ◽

Graphite Furnace ◽

Choline Chloride ◽

Deep Eutectic Solvent ◽

Absorption Spectrometry ◽

Edible Mushroom ◽

Graphite Furnace Atomic Absorption

Abstract In present study, we proposed the application of a deep eutectic solvent (DES) made up of choline chloride (ChCl) and oxalic acid (Ox) for the dissolution of different edible mushroom samples for the determination of selenium (Se) and arsenic (As) ions. Therefore, an innovative, green, novel, and inexpensive method based on ChCl–Ox as the DES was developed for the determination of Se and As ions in mushroom species by graphite furnace-atomic absorption spectrometry. The important analytical parameters were also optimized. The LODs for Se and As ions were found to be 0.32 and 0.50 µg/L, respectively. The LOQs for Se and As ions were found to be 1.06 and 1.65 µg/L, respectively. The RSD was observed to be less than 5% for both analyte ions. The accuracy of the developed method was confirmed by analyzing mushroom powder Certified Reference Material CS-M-3 (Boletus edulis). The developed technique was effectively useful for the determination of Se and As ions in different species of mushroom samples from Turkey.

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One-pot multi-component process for the synthesis of 4-azaphenanthrene-3,10-dione, 1,8-dioxo-octahydroxanthene and tetrahydrobenzo[b]pyran derivatives catalyzed by the deep eutectic solvent choline chloride-oxalic acid

Zeitschrift für Naturforschung B ◽

10.1515/znb-2019-0155 ◽

2020 ◽

Vol 75 (3) ◽

pp. 269-279

Author(s):

Mohammad Hosein Sayahi ◽

Maryam Gorjizadeh ◽

Melan Meheiseni ◽

Soheil Sayyahi

Keyword(s):

Oxalic Acid ◽

Choline Chloride ◽

Deep Eutectic Solvent ◽

Reaction Times ◽

Eutectic Mixture ◽

Reaction Yield ◽

One Pot ◽

Experimental Procedure ◽

Component Process ◽

High Yields

AbstractAn effective method based on choline chloride (ChCl)-oxalic acid (Ox) deep eutectic solvent was proposed for the synthesis of 4-azaphenanthrene-3,10-dione, 1,8-dioxo-octahydroxanthene and tetrahydrobenzo[b]pyran derivatives. The eutectic mixture worked as both the solvent and acidic catalyst for conversion. The impacts of different variables, including the composition and volume of ChCl-Ox, and temperature, on reaction yield were studied for optimization. The crucial advantages of this process are simplicity of the experimental procedure, high yields, short reaction times, high recyclability, and the use of safe and inexpensive components.

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Conversion of xylose and xylan into furfural in biorenewable choline chloride–oxalic acid deep eutectic solvent with the addition of metal chloride

Chinese Chemical Letters ◽

10.1016/j.cclet.2014.03.029 ◽

2014 ◽

Vol 25 (8) ◽

pp. 1132-1136 ◽

Cited By ~ 43

Author(s):

Lu-Xin Zhang ◽

Han Yu ◽

Hong-Bing Yu ◽

Ze Chen ◽

Lei Yang

Keyword(s):

Oxalic Acid ◽

Choline Chloride ◽

Deep Eutectic Solvent ◽

Metal Chloride

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Choline Chloride–Oxalic Acid as a Deep Eutectic Solvent–Based Innovative Digestion Method for the Determination of Selenium and Arsenic in Fish Samples

Journal of AOAC International ◽

10.5740/jaoacint.17-0286 ◽

2018 ◽

Vol 101 (4) ◽

pp. 1183-1189 ◽

Cited By ~ 3

Author(s):

Abdul Haleem Panhwar ◽

Mustafa Tuzen ◽

Tasneem Gul Kazi

Keyword(s):

Oxalic Acid ◽

Choline Chloride ◽

Electrothermal Atomic Absorption Spectrometry ◽

Deep Eutectic Solvent ◽

Absorption Spectrometry ◽

Fish Tissue ◽

Molar Ratio ◽

Digestion Method ◽

Fish Samples

Abstract An innovative and effective digestion method based on choline chloride (ChCl)–oxalic acid (Ox) deep eutectic solvent (DES) was proposed for the determination of Se and As in fish samples via electrothermal atomic absorption spectrometry (ETAAS). The impacts of different variables, including the composition and volume of ChCl–Ox, temperature, and acid addition, on analyte recovery were studied for optimization. In this procedure, an 80 mg sample was dissolved in a 1:2 molar ratio of ChCl–Ox at 105°C for 40 min, with the subsequent addition of 4.0 mL HNO3 (1.0 M) and further heating at the same temperature for about 5 min. Next, centrifugation was applied, and the supernatant solution was filtered, diluted to a known volume, and measured by ETAAS. The accuracy of the developed method was tested using a Standard Reference Material (NIST SRM 1946 Lake Superior Fish Tissue). The proposed DES-based digestion method was successfully applied to the simultaneous extraction of Se and As from fish samples.

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Study on catalytic conversion of cellulose to 5-Hydroxymethyl furfural by directional degradation in deep eutectic solvent

BioResources ◽

10.15376/biores.15.2.3344-3355 ◽

2020 ◽

Vol 15 (2) ◽

pp. 3344-3355

Author(s):

Hongyan Yang ◽

Jinyan Lang ◽

Junliang Lu ◽

Ping Lan ◽

Heng Zhang

Keyword(s):

Green Chemistry ◽

Oxalic Acid ◽

Microcrystalline Cellulose ◽

Choline Chloride ◽

Deep Eutectic Solvent ◽

Deep Eutectic Solvents ◽

Direct Conversion ◽

Metal Chlorides ◽

Hydroxymethyl Furfural ◽

New Type

The direct conversion of microcrystalline cellulose (MCC) degrading into 5-hydroxymethyl furfural (5-HMF) was studied using four synthetic deep eutectic solvents (DESs) as solvents and choosing four metal chlorides as catalysts. The factors that affected the yields of the products, such as the type of DESs, the type and dosage of catalysts, the ratio of DESs to MCC, and reaction temperature were researched. It was found that the DES synthesized from oxalic acid and choline chloride (O-DES) and SnCl4 showed the better performance. The highest 5-HMF and glucose yields of 11.0% and 22.0% were obtained, respectively, for a reaction carried out at 160 °C for 90 min in O-DES (the ratio of it to MCC was 25:1) using 1.42 wt% SnCl4 as the catalyst. As a new type of dissolution and catalysis system, the DESs were not only cheaper but also easy to obtain. Most importantly, the realization of the concept of green chemistry was achieved in this study.

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Production of 5-Hydroxymethylfurfural Derived Cassava Peels Using Deep Eutectic Solvent Based Choline Chloride

International Journal of Engineering Research in Africa ◽

10.4028/www.scientific.net/jera.53.190 ◽

2021 ◽

Vol 53 ◽

pp. 190-199

Author(s):

Renita Manurung ◽

Oktavianna Winda ◽

Herianto Silalahi ◽

Alwi Gery Agustan Siregar

Keyword(s):

Oxalic Acid ◽

Choline Chloride ◽

Deep Eutectic Solvent ◽

Deep Eutectic Solvents ◽

Biofuel Production ◽

Cellulose Content ◽

Dehydration Reaction ◽

Transportation Fuels ◽

Cassava Peels ◽

Proper Condition

The conversion of lignocellulosic biomass to biofuel as potential sources of transportation fuels, and for being both non-toxic and biodegradable. 5- Hydroxymethylfurfural (5-HMF) has been discovered to be a precursor for biofuel production and can be produced from biomass, which is readily available, renewable, and sustainable. Cellulose content in cassava peels is an opportunity to produce bio-based chemical products called 5-hydroxymethylfurfural. This study aims to determine the proper condition of glucose dehydration reaction of cassava peels hydrolysis. The optimum condition of dehydration reaction in this study was a glucose mass ratio: deep eutectic solvent of 1:6 and a reaction temperature of 80 ᵒC and the highest yield of 5-hydroxymethylfurfural using deep eutectic solvents (DES) based on choline chloride/oxalic acid was 70.22% and using DES based on choline chloride/oxalic acid was 64.50% at 5.70% glucose initial concentration using 1.5% H2SO4 catalyst on hydrolysis reaction cellulose of cassava peels. Physicochemical properties of deep eutectic solvents (DES) were pH of 5.8, density of 1.1574 gr/cm3 and viscosity of 119.33 cP. The results in this study indicate that the addition of DES choline chloride/oxalic acid can increase the yield of 5-hydroxymethylfurfural obtained.

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