Differential capacity curves for mercury in 0.1 M-LiCl-acetone-water system

1974 ◽  
Vol 39 (4) ◽  
pp. 924-934 ◽  
Author(s):  
O. Fischer ◽  
S. Standara ◽  
J. Totušek
Keyword(s):  
Water System ◽  
Differential Capacity ◽  
Capacity Curves ◽  
Acetone Water

Vapour-liquid equilibrium in the acetone-water system at 101.325 kPa

1984 ◽  
Vol 17 (1) ◽  
pp. 115-121 ◽  
Author(s):  
Jaroslava Polednová ◽  
Ivan Wichterle
Keyword(s):  
Water System ◽  
Liquid Equilibrium ◽  
Acetone Water

scholarly journals Cytoprotection of Antioxidant Biocompounds from Grape Pomace: Further Exfoliant Phytoactive Ingredients for Cosmetic Products

Cosmetics ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 46 ◽  
Author(s):  
Daniela F. Maluf ◽  
Melissa Gonçalves ◽  
Rebeca D’Angelo ◽  
Ana Girassol ◽  
Ana Tulio ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Water System ◽  
Grape Pomace ◽  
Raw Material ◽  
Butylated Hydroxytoluene ◽  
Total Phenolic ◽  
Acetone Water ◽  
Freeze Dried ◽  
Dpph Method ◽  
Cosmetic Formulations

The goal of this study was to investigate the efficacy and the safety of grape pomace (Vitis labrusca L.) obtained from the winemaking process as an antioxidant raw material for cosmetic formulations. Grape pomace was dried and submitted to extraction with solvents. The extracts were filtered and freeze-dried. The extraction carried out with 75% acetone-water showed a better yield (1.9 g·g−1). High performance liquid chromatography (HPLC) analysis confirmed the presence of ellagic acid as an active biocompound in the extracts. The Total phenolic content of freeze-dried extracts reached 69.83 ± 1.02 mg for 75% acetone-water system. Antioxidant activity determined by the 2,2-Diphenyl-1-picrylhydrazyl (DPPH) method revealed there was no statistical difference between the extract (EC50 6.9 ± 0.21) and butylated hydroxytoluene (BHT) (EC50 7.6 ± 0.71). Results of cytotoxicity showed that extracts from grape pomace were safe, even at the highest concentration tested (200 mg·mL−1) against the 3T3 cell line. Scanning Electron Microscopy (SEM) analysis revealed that there were no morphological cell changes of cells treated. Cytoprotection of cells towards the oxidation promoted by the peroxide solution was observed in the lowest concentration tested (0.73 mg·mL−1). Grape pomace from the winemaking process revealed a significant antioxidant activity attributed to its biocompounds. The safety and efficacy of extracts of grape pomace as raw material for cosmetic formulations was proposed through cell culture assays.

DIELECTRIC EVIDENCE FOR ACETONE HYDRATE

1963 ◽  
Vol 41 (2) ◽  
pp. 264-273 ◽  
Author(s):  
G. J. Wilson ◽  
D. W. Davidson
Keyword(s):  
Activation Energy ◽  
Dielectric Constant ◽  
High Frequency ◽  
Water System ◽  
Low Frequency ◽  
Water Molecules ◽  
Incongruent Melting ◽  
High Frequency Dielectric Constant ◽  
System A ◽  
Acetone Water

The phase diagram of the acetone–water system shows that acetone hydrate decomposes at an incongruent melting point. The existence of acetone hydrate is confirmed by a study of the low-frequency dielectric properties of this system. A dispersion region, related to the relaxation of water molecules in the clathrate structure, is characterized by a "static" dielectric constant and an activation energy about half as large as the corresponding values for ice, and by a limiting high-frequency dielectric constant of about 7 at 200° K. The magnitude of the latter is attributed to orientation of acetone molecules within the larger cavities of the hydrate structure.

Differential capacity curves of iron in perchloric acid in the presence of anions

1967 ◽  
Vol 7 (10) ◽  
pp. 657-664 ◽  
Author(s):  
Takao Murakawa ◽  
Toshiharu Kato ◽  
Shigeo Nagaura ◽  
Norman Hackerman
Keyword(s):  
Perchloric Acid ◽  
Differential Capacity ◽  
Capacity Curves
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