Topic
Acetone
About: Acetone is a(n) research topic. Over the lifetime, 9458 publication(s) have been published within this topic receiving 120867 citation(s). The topic is also known as: propanone & dimethylketone.
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TL;DR: Methods for the estimation of hydrogen peroxide in acetone extracts using titanium(IV) are likely to overestimate hydrogenperoxide when applied to plant leaves because pigments appear to co-precipitate with the titanium complex and cannot be removed by washing with solvents.
Abstract: Methods for the estimation of hydrogen peroxide in acetone extracts using titanium(IV) are likely to overestimate hydrogen peroxide when applied to plant leaves. Pigments appear to co-precipitate with the titanium complex and cannot be removed by washing with solvents. Fluoride, which specifically removes the color of the titanium-peroxide complex, removes only some of the color from the reactions with plant extracts. This problem has been avoided by extracting tissues with trichloroacetic acid, and measuring peroxide against catalase-treated blanks by its reaction with the complex of titanium(IV) with 4-(2-pyridylazo)resorcinol. Levels of hydrogen peroxide in leaves of a variety of species were found to range from about 0.1 to 0.6 μmol · g−1.
869 citations
TL;DR: Grape seeds were powdered and the fatty material was extracted in a Soxhlet extractor with petroleum ether (60-80°C) for 6 hours, and the extracts were concentrated under vacuum to obtain crude extracts, which were analyzed by high performance liquid chromatography with UV detection at 280 nm as mentioned in this paper.
Abstract: Grape seeds were powdered and the fatty material was extracted in a Soxhlet extractor with petroleum ether (60–80 °C) for 6 h. The defatted powder was extracted with acetone:water:acetic acid (90:9.5:0.5) and methanol:water:acetic acid (90:9.5:0.5) for 8 h each separately. The extracts were concentrated under vacuum to obtain crude extracts, which were analyzed by high performance liquid chromatography with UV detection at 280 nm. Monomeric procyanidin was found to be the major compound being at 48 and 40% in acetone:water:acetic acid (90:9.5:0.5) and methanol:water:acetic acid (90:9.5:0.5) extracts, respectively. These extracts were tested for antibacterial activity by pour plate method against Bacillus cereus, Bacillus coagulans, Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. It was found that, Gram-positive bacteria were completely inhibited at 850–1000 ppm, while Gram-negative bacteria were inhibited at 1250–1500 ppm concentration. Radical-scavenging activity of grape seed extracts of acetone:water:acetic acid (90:9.5:0.5) and methanol:water:acetic acid (90:9.5:0.5) were compared with BHA at 25 and 50 ppm concentrations by HPLC method using 1, 1-diphenyl-2-picrylhydrazyl (DPPH). The antioxidant capacities of grape seed extracts were determined by the formation of phosphomolybdenum complex method. It was found that acetone:water:acetic acid (90:9.5:0.5) extract was better radical scavenger than methanol:water:acetic acid (90:9.5:0.5) extract.
599 citations
576 citations
TL;DR: In this article, photocatalyzed degradations of trace levels of various oxygenates and an aromatic in air were carried out using near-UV-illuminated titanium dioxide (anatase) powder.
Abstract: Photocatalyzed degradations of trace levels of various oxygenates and an aromatic in air were carried out using near-UV-illuminated titanium dioxide (anatase) powder. The initial rates of degradation for acetone, 1-butanol, formaldehyde, and m-xylene were well described by Langmuir-Hinshelwood rate forms. No reaction intermediates were detected for acetone oxidation at conversions of 5–20%. Butyraldehyde was the main product of 1-butanol oxidation for conversions of 20–30%. The influence of 5% water (simulating partial humidification) in the feedstream varied strongly: water vapor inhibited acetone oxidation, but had no influence on the 1-butanol conversion rate. m-Xylene conversion was enhanced by trace water addition, but inhibited at higher water levels. Some catalyst deactivation was detected between 1-butanol runs; the activity could be easily recovered by illuminating the catalyst in fresh air. Formaldehyde was also successfully oxidized. These results, taken together with earlier literature citations for photocatalyzed total oxidation of methane, ethane, trichloroethylene (but see (27)), toluene, and a very recent report for oxidation of odor compounds, indicate a favorable technical potential for photocatalyzed treatment of air in order to degrade and remove all major classes of oxidizable air contaminants.
488 citations
TL;DR: Dimethyl sulfoxide (DMSO) and 90% acetone extracted equal amounts of chlorophyll from diatoms and blue-green algae, but DMSO was superior to 90%acetone for all green algae tested giving 2-60 times more chlorophyLL depending on the species as discussed by the authors.
Abstract: Dimethyl sulfoxide (DMSO) and 90% acetone extracted equal amounts of chlorophyll from diatoms and blue-green algae, but DMSO was superior to 90% acetone for all green algae tested giving 2–60 times more chlorophyll depending on the species. The absorbance spectra of pure chlorophyll a (and b) from 600 nm to 750 nm were identical whether dissolved in 90% acetone or a mixture of DMSO and 90% acetone (1:1 v/v). Thus, several equations for estimating chlorophyll concentration based on extinction in 90% acetone are applicable with this solvent.
477 citations