Organic compounds classes

Group of organisms Compound class Bioactivity Reference... 

Wang, X.C., Druffel, E.R.M., and Lee, C. (1996) Radiocarbon in organic compound classes in particulate organic matter and sediments in the deep northeast Pacific Ocean. Geophys. Res. Lett. 23, 3583-3586. 

The initial step in molecular-level analysis of DON s most abundant organic compound classes is typically acid hydrolysis, necessary to break polymeric biomolecules into monomers for separation and detection. While the subsequent derivatization and chromatography steps can be shown to be quantitative (it is only on the basis of these post-hydrolysis steps that molecular-level methods are usuaUy termed quantitative in the first place), the efficiency of the key initial hydrolysis remains largely a black box—overaU efficiency is not known, extent of side reactions are not weU... 

Wang, X. C., DrufFel, E. R. M., Griffen, S., Lee, C., and Kashgarian, M. (1998). Radiocarbon studies of organic compound classes in plankton and sediment of the northeastern Pacific Ocean. Geochim. Cosmochim. Acta 62, 1365-1378. 

Wang X.-C. and Druffel E. R. M. (2001) Radiocarbon and stable carbon isotope compositions of organic compound classes in sediments from the NE Pacific and Southern Oceans. Mar. Chem. 73, 65-81. 

There are many organic compound classes that are not amenable to analysis by GC owing to poor volatility, thermal instability, or polarity. A great many of these... 

We now discuss briefly the essential features of the atmospheric chemistry of the different organic compound classes. 

The term lipids is defined as those organic compounds that are insoluble in water, soluble in organic solvents (e.g., chloroform, ether), contain hydrocarbon groups as primary parts of the molecule, and are present in or derived from living organisms. Compound classes covered in this definition include fatty acids (FA), acylglycerols, FA esters (e.g., waxes), and isoprenoid hydrocarbons. Other compounds also included are often considered as belonging to different classes, such as carotenoids, sterols, and the vitamins A, D, E, and K. 

Mass Spectra of Other Organic Compound Classes... 

Dusty substances Class Organic compounds Class ... 

A combination of uncertainty in thermodynamic data accuracy at elevated temperatures and overall lack of completeness with respect to organic compound class and interaction types (complex formation, adsorption, solid precipitate) poses some real limitations in the use of chemical and reaction path models. Thus, a cautionary note is that to compare results of different numerical studies it is necessary to know whether similar thermodynamic data bases were used. As we will show below, apparently discrepant conclusions drawn from modeling studies probably result from the use of more or less complete thermodynamic data. Of concern in the investigation of organic acid interactions in silicate rocks is the complete lack of any equilibrium measurements of silica-organic acid anion interactions, although dissolution rate measurements have been made (Bennett et al. 1988 Bennett 1991). 

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