scholarly journals Valorization of Spent Coffee by Caffeine Extraction Using Aqueous Solutions of Cholinium-Based Ionic Liquids

2021 ◽  
Vol 13 (13) ◽  
pp. 7509
Author(s):  
Ana M. Ferreira ◽  
Hugo M. D. Gomes ◽  
João A. P. Coutinho ◽  
Mara G. Freire
Keyword(s):  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Pure Water ◽  
Waste Product ◽  
Weight Ratio ◽  
Extraction Yield ◽  
Operational Conditions ◽  
Coffee Grounds ◽  
Extractable Compounds ◽  
Nutraceutical Products

Spent coffee grounds (SCGs) are a waste product with no relevant commercial value. However, SCGs are rich in extractable compounds with biological activity. To add value to this coffee byproduct, water and aqueous solutions of cholinium-based ionic liquids (ILs) were studied to extract caffeine from SCGs. In general, all IL aqueous solutions lead to higher extraction efficiencies of caffeine than pure water, with aqueous solutions of cholinium bicarbonate being the most efficient. A factorial planning was applied to optimize operational conditions. Aqueous solutions of cholinium bicarbonate, at a temperature of 80 °C for 30 min of extraction, a biomass–solvent weight ratio of 0.05 and at an IL concentration of 1.5 M, made it possible to extract 3.29 wt% of caffeine (against 1.50 wt% obtained at the best conditions obtained with pure water). Furthermore, to improve the sustainability of the process, the same IL aqueous solution was consecutively applied to extract caffeine from six samples of fresh biomass, where an increase in the extraction yield from 3.29 to 13.10 wt% was achieved. Finally, the cholinium bicarbonate was converted to cholinium chloride by titration with hydrochloric acid envisioning the direct application of the IL-caffeine extract in food, cosmetic and nutraceutical products. The results obtained prove that aqueous solutions of cholinium-based ILs are improved solvents for the extraction of caffeine from SCGs, paving the way for their use in the valorization of other waste rich in high-value compounds.

scholarly journals Surface Interaction of Ionic Liquids: Stabilization of Polyethylene Terephthalate-Degrading Enzymes in Solution

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 119
Author(s):  
Zeenat Zara ◽  
Deepti Mishra ◽  
Saurabh Kumar Pandey ◽  
Eva Csefalvay ◽  
Fatemeh Fadaei ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Aqueous Solution ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Molecular Dynamics Simulations ◽  
Polyethylene Terephthalate ◽  
Pure Water ◽  
Structure And Dynamics ◽  
Dynamics Simulations

The effect of aqueous solutions of selected ionic liquids solutions on Ideonella sakaiensis PETase with bis(2-hydroxyethyl) terephthalate (BHET) substrate were studied by means of molecular dynamics simulations in order to identify the possible effect of ionic liquids on the structure and dynamics of enzymatic Polyethylene terephthalate (PET) hydrolysis. The use of specific ionic liquids can potentially enhance the enzymatic hydrolyses of PET where these ionic liquids are known to partially dissolve PET. The aqueous solution of cholinium phosphate were found to have the smallest effect of the structure of PETase, and its interaction with (BHET) as substrate was comparable to that with the pure water. Thus, the cholinium phosphate was identified as possible candidate as ionic liquid co-solvent to study the enzymatic hydrolyses of PET.

scholarly journals Enhancing Artemisinin Solubility in Aqueous Solutions: Searching for Hydrotropes based on Ionic Liquids

2021 ◽  
Vol 534 ◽  
pp. 112961
Author(s):  
Isabela Sales ◽  
Dinis O. Abranches ◽  
Pedro Costa ◽  
Tânia E. Sintra ◽  
Sónia P.M. Ventura ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Aqueous Solutions

Adsorption of imidazolium-based ionic liquids with different chemical structures onto various resins from aqueous solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 41352-41358 ◽  
Author(s):  
Luyang Li ◽  
Yu Wang ◽  
Xinhua Qi
Keyword(s):  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Adsorption Behavior ◽  
Chemical Structures

The adsorption behavior of a series of imidazolium-based ionic liquids with different chemical structures onto various resins was investigated.

The nature of ions organisation in aqueous solutions of ionic liquids based on local anaesthetic drugs and salicylic acid

2021 ◽  
pp. 116673
Author(s):  
Milan Vranes ◽  
Jovana Panic ◽  
Slobodan Gadzuric ◽  
Marija Bester-Rogac ◽  
Aleksandar Tot
Keyword(s):  
Salicylic Acid ◽  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Local Anaesthetic

scholarly journals Growth of mango (Mangifera indica L.) rootstocks as influenced by pre-sowing treatments

2017 ◽  
Vol 9 (1) ◽  
pp. 582-586
Author(s):  
R. J. Patel ◽  
T. R. Ahlawat ◽  
A. I. Patel ◽  
J. J. Amarcholi ◽  
B. B. Patel ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Root Length ◽  
Mangifera Indica ◽  
Lateral Roots ◽  
Weight Ratio ◽  
Dry Weight ◽  
Shoot Length ◽  
Shoot Dry Weight ◽  
Survival Percentage ◽  
Total Dry Weight

An experiment was carried out at Navsari Agricultural University, Navsari during 2014 to evaluate the effect of pre-sowing treatments on survival percentage and growth of mango rootstocks. Mango stones were soaked in aqueous solutions of GA3 (100 and 200 ppm), Beejamruth (2 % and 3 %) and Thiourea (1 % and 2 %) for 12 and 24 hours. The trial was evaluated in Completely Randomized Design based on factorial concept and the treatments were replicated thrice. Imposition of treatments led to significant differences at 5 % level of significance for all parameters chosen in this study. Mango stones when treated with Thiourea at 1 % had the maximum shoot length (49.93 cm), root length (34.38 cm), shoot dry weight (21.08 g) and total dry weight (26.36 g). The highest number of lateral roots (10.90) and survival percentage (64.17) was observed in mango stones dipped in 100 ppm GA3. Between the two soaking duration, soaking mango stones for 24 hours recorded higher values for shoot length (45.03 cm), root length (32.79 cm), number of lateral roots (9.83), survival percentage (62.72), shoot root fresh weight ratio (4.30), shoot dry weight (21.33 g), total dry weight (26.28 g) and shoot root dry weight ratio (4.32). Thus, survival percentage and growth of mango rootstocks can be substantially improved by soaking mango stones in aqueous solutions of 100 ppm GA3 or Thiourea at 1 % for 24 hours before sowing.

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