Aggregation of the Dipeptide Leu–Gly in Alcohol–Water Binary Solvents Elucidated from the Solvation Structure for Each Moiety

2021 ◽  
Author(s):  
Takahiro To ◽  
Yusuke Sakamoto ◽  
Koichiro Sadakane ◽  
Masaru Matsugami ◽  
Toshiyuki Takamuku
Keyword(s):  
Binary Solvents ◽  
Alcohol Water ◽  
Solvation Structure

Determination and correlation of solubility and solution thermodynamics of oxiracetam in three (alcohol + water) binary solvents

2016 ◽  
Vol 96 ◽  
pp. 12-23 ◽  
Author(s):  
Kangli Li ◽  
Shichao Du ◽  
Songgu Wu ◽  
Dongchen Cai ◽  
Jinxu Wang ◽  
...  
Keyword(s):  
Solution Thermodynamics ◽  
Binary Solvents ◽  
Alcohol Water

Determination of δ-hexadecansultone in sodium α-olefinesulphonates and liquid detergents using gas chromatography-mass spectrometry (GC/MS)

2019 ◽  
Vol 85 (7) ◽  
pp. 16-21
Author(s):  
Liliya R. Mubarakova ◽  
German K. Budnikov
Keyword(s):  
Multicomponent Mixture ◽  
Operating Mode ◽  
Complete Separation ◽  
Gas Chromatography Mass Spectrometry ◽  
Liquid Detergent ◽  
Cyclic Esters ◽  
Alcohol Water ◽  
Household Chemicals ◽  
Hydrolysis Of

Sultones are cyclic esters of hydroxysulfonic acids, which are formed in the process of sulfonation of α-olefins with sulfur trioxide gas. More stable sultones may be present in the final product — an anionic surfactant — sodium α-olefin sulfonate (AOC-Na). AOC-Na is widely used in the production of household chemicals and cosmetic products, including liquid dishwashing detergents. Sultones are strong skin sensitizers, their level in AOC-Na should be strictly controlled and not exceed 5 ppm. Operational and strict control of the sultone content upon AOC-Na production allows timely adjustment at the stage of hydrolysis, which leads to a more complete disclosure of the sultone cycle with the formation of the corresponding olefin sulfonates and hydroxyalkanesulfonates. We propose a method for determining δ-hexadecansultone in liquid dishwashing detergents and sodium α-olefinsulfonates obtained on the basis of α-olefins of C14 – C16 fractions using GC/MS, which provides shortening of sample preparation and keeps the sensitivity with a detection limit of 0.02 mg/kg. The effect of various weakly polar and non-polar organic solvents used for Sultone extraction from AOC-Na and liquid detergent on liquid extraction based on the dispersion of the extractant in an alcohol/water phase is studied. When selecting the solvent we have shown that the use of diethyl ether provided the best extraction of the analyte. Determination of the analyte extraction recovery was performed using the reaction of hydrolysis of the extracted mixture. We specified the operating mode of the device which provided complete separation of the components of the analyzed compounds including the samples of liquid detergent for dishes being a multicomponent mixture of complex composition.

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