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8 results for “green solvents”
A green extraction design for enhancing flavonoid compounds from the Ixora javanica flowers using a deep eutectic solvent
<p>In this study, an environmentally friendly extraction method for flavonoid compound from <em>Ixora javanica</em> as a new raw material candidate for herbal medicine and cosmetics, was developed. The objectives of the present work were to provide recommendations for the optimal extraction conditions and to investigate the effects of any extraction parameters on flavonoid yields from the <em>I. javanica</em> flower. The extraction process was performed using deep eutectic solvent (DES) (choline chloride and propylene glycol at molar ratio of 1:1) and ultrasound-assisted extraction (UAE) method. Both single-factor and response surface analyses using three-level and three-factor Box Behnken designs were conducted to obtain the optimum flavonoid concentrations. The results showed that the optimum extraction conditions for total flavonoids featured an extraction time of 40 min, 25% water content in DES, and a solid-to-liquid ratio of 1:25 g/mL. An extract obtained under optimum extraction conditions showed higher total flavonoid yields than an ethanolic extract which was used for comparison. Scanning electron microscope (SEM) images demonstrated that both of the solvents also showed different effects on the outer surface of the <em>I. javanica</em> flower during extraction process. In sum, our work succeeded in determining the optimum conditions for total flavonoids in the <em>I. javanica</em> flower using a green extraction method.</p>
Green Extraction of depsidones and depsides from H. physodes using Natural Deep Eutectic Solvents
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A green extraction design for enhancing flavonoid compounds from the Ixora javanica flowers using a deep eutectic solvent
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A green solvent enables precursor phase engineering of stable formamidinium lead triiodide perovskite solar cells - Data Availability
<p>A green solvent enables precursor phase engineering of stable formamidinium lead triiodide perovskite solar cells - Data Availability</p>
A green method of extracting and recovering flavonoids from Acanthopanax senticosus using deep eutectic solvents
<p><span>In recent years, green extraction of bioactive compounds from herbal medicines has generated widespread interest. Deep eutectic solvents (DES) have widely replaced traditional organic solvents in the extraction process. In this study, the efficiencies of eight tailor-made DESs in extracting flavonoids from <i>Acanthopanax senticosus</i> (AS) were compared. Response surface methodology (RSM) was employed to optimize the influencing parameters including ultrasonic power, HBA-HBD ratio, water content, solid-liquid ratio, extraction temperature and extraction time. DES composed of glycerol and levulinic acid at a 1:1 ratio was established as the most suitable extraction medium. Optimal conditions were ultrasonic power of 500W, water content of 28%, solid-liquid ratio of 1:18 g·mL<sup>-1</sup>, extraction temperature of 55℃ and extraction time of 73 minutes. The extraction yield of AS total flavonoids reached 23.928±0.071 mg·g<sup>-1</sup>, which was 86.3% and 43.8% higher compared with traditional solvent soak and ethanol reflux extraction methods, respectively. Macroporous resin (D-101, HPD-600, S-8 and AB-8) was used to recover flavonoids from extracts. The AB-8 resin showed higher adsorption/desorption performance, with a recovery rate of total flavonoids of up to 71.56±0.256%. In addition, DES solvent could be efficiently recovered through this process and reused. In summary, ultrasonic-assisted DES combined with the macroporous resin enrichment method is exceptionally effective in extracting flavonoids from AS and provides a promising environmentally friendly and recyclable strategy for flavonoid extraction from natural plant sources.</span></p>
Extractive desulfurization of liquid fuel using diamine-terminated polyethylene glycol as a very low vapor pressure and green molecular solvent
<p>Removal of sulfur compounds from liquid fuel is one of the important issues in the field of energy and environment. Among the available methods, extractive desulfurization (EDS) is of great interest due to its convenient operating conditions. In this study, EDS performance of 4,7,10-trioxatridecane-1,13-diamine (TTD), a very low vapor pressure diamine-terminated oligomeric polyethylene glycol, was studied. Effect of the influencing factors, as well as multiple extraction, mutual solubility, reusability and regeneration of TTD were investigated. Results showed that the TTD/fuel volume ratio of 0.5 could extract benzothiophene, dibenzothiophene, and dimethyl dibenzothiophene with the efficiencies 67, 74, and 53%, respectively, in less than one minute at ambient temperature. The distribution coefficient (<i>K<sub>N</sub></i>) value for removal of dibenzothiophene by TTD was 3.66 higher than that of polyethylene glycols (PEG) and it is similar to <i>K<sub>N</sub></i> values (about 4) for polyethylene glycol dimethyl ether (as a modified PEG) and Lewis acid-containing ionic liquids. It was observed that spent TTD after 5 cycles could be regenerated using the back-extraction method. Also, deep EDS was achievable after 3 times extraction using fresh TTD. Finally, the extraction mechanism was studied using <sup>1</sup>H-NMR. These observations, as well as very low vapor pressure and insignificant dependency of TTD on the initial S-concentration of fuel and temperature, make this extractant to be introduced as a valuable option for green and effective EDS.</p>
Extractive desulfurization of liquid fuel using diamine-terminated polyethylene glycol as a very low vapor pressure and green molecular solvent
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Alternative Solvents through Green Chemistry Project
<p>The purpose of this project is to develop state-of-the-art, green precision cleaning technologies for NASA&rsquo;s 21<sup>st</sup> Century Launch Complex thus eliminating long-term environmental costs to the Program.&nbsp; Precision cleaning is of critical importance in the aerospace industry.&nbsp; Failure to clean to specified levels may result in problems ranging from impaired performance to catastrophic failure.&nbsp;</p><p>Of particular concern is the cleaning of systems containing strong oxidizers such as liquid oxygen (LOX) or hypergolic fuels.&nbsp; Currently, precision cleaning at Kennedy Space Center is performed using dual-solvent process in which the first solvent, Vertrel MCA, is used to clean the component and a second solvent, HFE-7100, is used as a final rinse and analytical test fluid.&nbsp; Highly fluorinated compounds such as those used in Vertrel MCA are extremely persistent in the environment and are potent greenhouse gases. Continued use of this or similar solvents will lead to high remediation costs that must be carried by the Program for years to come.</p><p>Historically, precision cleaning has used chlorofluorocarbons (CFCs), such as Freon, because it was non-toxic and performed extremely wll.&nbsp; When Freon, and other CFCs, were banned due to their harmful environmental effects, new solvents were identified that were similar compounds but were not yet regulated.&nbsp; Eventually, these solvents also become regulated and unavailable for use.&nbsp; This project specifically did not consider halogenated solvents in order to find solvents or technologies that would not face future environmental regulations.</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.