The formulation and physicochemical properties of betaine-based natural deep eutectic solvent was written by Mohd Fuad, Faiznur;Mohd Nadzir, Masrina. And the article was included in Journal of Molecular Liquids in 2022.Quality Control of 1,2-Propanediol This article mentions the following:
Eleven different types of natural deep eutectic solvent (NADES) were synthesized using betaine (Bet) as a hydrogen bond acceptor (HBA) with glycerol (Gly), 1,2-propanediol (1,2P), lactic acid (LA), levulinic acid (Lev), anhydrous citric acid (CA), malic acid (MA), tartaric acid (TA), xylitol (Xyl), sorbitol (Sor), glucose (Glu), and sucrose (Suc) as the hydrogen bond donors (HBD). They were synthesized at different molar ratios (3:1, 2:1, 1:1, 1:2, 1:3) to determine their appropriate formulation. Formulations that gave a clear, homogenous liquid were identified as Bet-Gly (1:2), Bet-1,2P (1:4), Bet-LA (1:2), Bet-Lev (1:2), Bet-CA (1:1, 20% weight/weight water), Bet-MA (1:1, 20% weight/weight water), Bet-TA (1:1, 20% weight/weight water), Bet-Xyl (1:2, 20% weight/weight water), Bet-Sor (1:2, 20% weight/weight water), Bet-Glu (1:1, 20% weight/weight water), and Bet-Suc (1:1, 20% weight/weight water). The successfully synthesized NADESs remained as stable liquids for more than 30 days. Based on the anal. using Fourier transform IR (FTIR) spectroscopy, it was confirmed that a hydrogen bonding interaction was established between the HBA and the HBD in the NADES system. In addition, the thermal stabilities of these NADESs were evaluated through a thermogravimetry anal. (TGA). The onset decomposition temperatures of the NADESs were in the range of 106.92°C-233.66°C. Furthermore, the NADESs were evaluated for their physicochem. properties, including viscosity, d., polarity, surface tension, elec. conductivity, and pH. The NADESs were often diluted with water to reduce viscosity during their application. Therefore, the influence of the addition of water on the physicochem. properties of NADESs was evaluated. This knowledge provides an in-depth understanding of the characteristics and behavior of the NADESs during any process. In the experiment, the researchers used many compounds, for example, 1,2-Propanediol (cas: 57-55-6Quality Control of 1,2-Propanediol).
1,2-Propanediol (cas: 57-55-6) belongs to alcohols. The oxygen atom of the strongly polarized O―H bond of an alcohol pulls electron density away from the hydrogen atom. This polarized hydrogen, which bears a partial positive charge, can form a hydrogen bond with a pair of nonbonding electrons on another oxygen atom. The most common reactions of alcohols can be classified as oxidation, dehydration, substitution, esterification, and reactions of alkoxides.Quality Control of 1,2-Propanediol
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts