Green Tailoring With Water of Choline Chloride Deep Eutectic Solvents for the Extraction of Polyphenols From Palm Samples

Liu, Xiao; Fu, Najing; Zhang, Qiangguo; Cai, Shuaifang; Wang, Qiong; Han, Dandan; Tang, Boming

doi:10.1093/chromsci/bmy099

Cited by 28 publications

(18 citation statements)

References 24 publications

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“…At these experimental points, the viscosity was very low, indicating that the DES might lose its intrinsic characteristics and become a simple aqueous solution. It has been reported that a very low viscosity induce less hydrogen-bonding and decrease the extraction yield of phytochemical compounds [37,62]. The highest values were detected in the runs where DES did not require additional water.…”

Section: Model Analysismentioning

confidence: 93%

“…The high extraction yield of SAFA m is associated with the multiple hydrogen-bonding and low viscosity. The carboxyl group (-COOH) of formic acid presented more interactions between hydrogen-bonding [37]. The high efficiency of acid-based DESs for the extraction of polyphenolics have been proved and told to due to the H-bonding interactions among DES components and the low viscosity [57][58][59][60][61].…”

Section: Evaluation Of Dess Efficiencymentioning

confidence: 99%

“…This can be explained because the carboxyl group (-COOH) and sodium cation (-Na + ) from sodium acetate would combine with the carboxyl group (-COOH) or the hydroxyl group (-OH) of formic acid. With the lower molarity ratio of formic acid, there are many specific groups from HBA, which could not bond with the specific groups of HBD, leading to the precipitation of DESs [37,53]. Nonetheless, the effects of molarity ratio were moderate when compared to the effects of additional water.…”

Section: Model Analysismentioning

confidence: 99%

“…The hydrophilic DESs are easy to use, reduce the viscosity and preparation cost and increase polyphenolic extraction yields, nonetheless, a certain of amount of water could not be overpassed [30,33,57,65]. Adding more water weakens the interactions between the hydrogen-bonding of different components, affecting the extraction yield [37].…”

Section: Model Analysismentioning

confidence: 99%

“…The high viscosity of DESs constitutes severe obstacles for their implementation in industry, even though the fluidity of these solvents might be increased by adding some quantities of water [ 28 ]. Therefore, the hydrophilic DESs have been developed, and the effects of water on their structure, as well as properties have been investigated [ 35 , 36 , 37 , 38 , 39 , 40 ]. For the extraction of polyphenolic compounds, diverse water contents either as a molar ratio or as a percentage have been reported [ 30 , 41 , 42 , 43 , 44 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

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Recovery and Stabilization of Anthocyanins and Phenolic Antioxidants of Roselle (Hibiscus sabdariffa L.) with Hydrophilic Deep Eutectic Solvents

et al. 2020

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: Deep eutectic solvents (DESs) have got huge interest as new green and sustainable solvents for the extraction of bioactive compounds from plants in recent decades. In the present study, we aimed to investigate the effectiveness of hydrophilic DES for the extraction of anthocyanin and polyphenol antioxidants from Roselle. A natural hydrophilic DES constituted of sodium acetate (hydrogen bond acceptor) and formic acid (hydrogen bond donor) designed to evaluate the total phenolic compound (TPC), total flavonoid (TFC), total anthocyanin (TACN), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and ferric reducing antioxidant power (FRAP) values of Roselle. Distilled water, 70% ethanol, and 80% methanol used as conventional solvents for comparison. The results indicated that the DES prepared in molarity ratio (SAFAm) was the most efficient. Subsequently, this prominent DES selected for the optimization and the optimum extraction conditions were 1:3.6 molarity ratio, 0% additional water, and 10 mL solvent. TPC, TFC, TACN, FRAP, and DPPH radical scavenging at the optimum point were 233.26 mg GAE/g, 10.14 mg ECE/g, 10.62 mg D3S/g, 493.45 mmol ISE/g, and 343.41 mmol TE/g, respectively. The stability tests showed that anthocyanins were more stable in SAFAm. These findings revealed that SAFAm is an effective green solvent for the extraction of polyphenols from various plants.

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Section: Model Analysismentioning

confidence: 93%

Section: Evaluation Of Dess Efficiencymentioning

confidence: 99%

Section: Model Analysismentioning

confidence: 99%

Section: Model Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recovery and Stabilization of Anthocyanins and Phenolic Antioxidants of Roselle (Hibiscus sabdariffa L.) with Hydrophilic Deep Eutectic Solvents

et al. 2020

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Extraction of ferulic acid from oil palm pressed fiber by a choline chloride based deep eutectic solvent

Hadi

2022

J Americ Oil Chem Soc

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Results on the extraction of ferulic acid from palm pressed fiber using deep eutectic solvent (DES) of choline chloride-acetic acid (ChCl-AA) and choline chloride-citric acid (ChCl-CA) are reported. Acetic acid was found to be a better hydrogen bond donor to choline chloride than citric acid for the extraction of ferulic acid. Influence of water content in both DES was investigated whereby ChCl-AA and ChCl-CA experienced a drop in viscosity from 9.678 to 1.429 and 22.658 AE 1.655 mm 2 /s, respectively as the water content in the DES increased from 0 to 50 wt%. The drop in viscosity contributed to higher extraction efficiency in which 41,155 AE 940 mg/kg ferulic acid was obtained after 6 h reflux when ChCl-AA with 30 wt% water was used for the extraction compared to 30,940 AE 621 mg/kg when neat ChCl-AA was used. Further increase in water content in the DES however, did not lead to higher extraction efficiency. Although viscosity of the DES could be improved with the addition of water, there is a threshold where the DES could tolerate the presence of water without changing its solvent behavior. Surface response model revealed that interaction between heating duration and water content in DES, as well as second order effect of both heating duration and water content in DES played important roles in the extraction of ferulic acid from oil palm pressed fiber. The optimum condition for extraction of ferulic acid from palm pressed fiber was heating for 6 h with DES containing 30 wt% water.

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A review on the thermal conductivity of deep eutectic solvents

Aparício

2023

J Therm Anal Calorim

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Deep eutectic solvents may develop a pivotal role in future technologies considering sustainability and safety as pivotal aspects for chemistry developments. The possible application of these fluids for heat transfer operations is of great relevance for which the knowledge of thermal properties such as thermal conductivity is required as well as inferring structure–property relationships which allow reverse design of the fluids according to the technological requirements. Considering the technological relevance of this property, the available literature on the thermal conductivity for deep eutectic solvents is critically discussed showing strengths and weaknesses. The analysis of the state-of-the-art shows the future needs in this research field considering the application of these solvents for thermal-related technologies. The review indicates the scarcity of reliable experimental data and the need of predictive methods, which could be used for process design and solvent screening purposes. Likewise, considering the relevance of developing predictive methods for in silico design of these fluids according to industrial needs, the available predictive theoretical approaches are analysed showing their reliability as well as future needs. Finally, considering the need of developing suitable and reliable structure–property relationship, the molecular level basis of thermal conductivity in deep eutectic solvents is discussed, showing the role of hydrogen bonding and the effects rising from the involved hydrogen bond donors and acceptors as well as the eutectic compositions. This work reports the first literature review and analysis on thermal conductivity for deep eutectic solvents considering an experimental and theoretical approach as well as providing support for the molecular basis of this technologically relevant property, thus contributing to the development of environmentally friendly materials for thermal-related technologies. Graphical abstract

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Green Tailoring With Water of Choline Chloride Deep Eutectic Solvents for the Extraction of Polyphenols From Palm Samples

Cited by 28 publications

References 24 publications

Recovery and Stabilization of Anthocyanins and Phenolic Antioxidants of Roselle (Hibiscus sabdariffa L.) with Hydrophilic Deep Eutectic Solvents

Recovery and Stabilization of Anthocyanins and Phenolic Antioxidants of Roselle (Hibiscus sabdariffa L.) with Hydrophilic Deep Eutectic Solvents

Extraction of ferulic acid from oil palm pressed fiber by a choline chloride based deep eutectic solvent

A review on the thermal conductivity of deep eutectic solvents

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