Compound-Specific Radiocarbon Analysis of Low Molecular Weight Dicarboxylic Acids in Ambient Aerosols Using Preparative Gas Chromatography: Method Development was written by Xu, Buqing;Cheng, Zhineng;Gustafsson, Orjan;Kawamura, Kimitaka;Jin, Biao;Zhu, Sanyuan;Tang, Tiangang;Zhang, Bolong;Li, Jun;Zhang, Gan. And the article was included in Environmental Science & Technology Letters in 2021.Recommanded Product: 1190-39-2 This article mentions the following:
Low mol. weight dicarboxylic acids constitute a large fraction of atm. organic aerosols, which impact atm. radiative forcing and hence Earth’s climate. Radiocarbon (14C) is a unique approach to unambiguously distinguishing the relative contributions of biomass-derived and fossil sources. Here, we developed a compound-specific radiocarbon anal. (CSRA) method for individual dicarboxylic acids in atm. particulates. Specifically, the method starts with a di-Bu ester derivatization technique, followed by separation and harvesting of single compounds employing a preparative capillary gas chromatog. in sufficient amounts for offline 14C measurement with accelerator mass spectrometry. The optimized preparative steps yielded recoveries of >60% and purities of >99% for target mols. The radiocarbon isotope compositions determined for reference standards taken through the entire method agree well with the original composition of each standard (R2 = 0.9998). The applicability of the approach was demonstrated with ambient aerosol samples representing contrasting air mass regimes. This yielded two radically different yet system-consistent precursor sources. A min. size of 50μg of C of ambient dicarboxylic acids is needed for credible 14C measurement. The established method for CSRA of dicarboxylic acids demonstrates a new anal. dimension for studies of the source and evolution of atm. secondary organic aerosols. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Recommanded Product: 1190-39-2).
malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Recommanded Product: 1190-39-2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics