Insoluble, Nonhydrolyzable, Aliphatic Macromolecular Constituents of Microbial Cell Walls

摘要: The recognition of nonhydrolyzable, highly aliphatic biomacromolecules stems from the analysis organic matter present in sediments varying age very Recent to hundreds millions years old. far greater part sedimentary matter, i.e., over 95%, is high molecular nature, nonhydrolyzable and insoluble water solvents, commonly referred as kerogen. total amount kerogen earth’s crust presently estimated 30 × 1021 g (Hedges, 1992) by largest pool carbon on our planet (for comparison: living marine organisms only 2 1015 C). It has long been known that kerogen-rich deposits act source rocks crude oil gas after burial eons at elevated temperatures (Tissot Weite, 1984). As a consequence its complexity, insolubility, high-molecular-weight one most problematic substances characterize level. Until few ago, it was generally accepted resulted random condensation process small amounts nonmineralized amino acids monosaccharides, resulting microbially induced depolymerization proteins polysaccharides, respectively, lipid components Such supposed generate humic type sediments, which upon further underwent chemical transformations finally absence recognizable entities kerogens when studied light microscopic techniques seemed support this formation hypothesis. developments analytical chemistry have enabled more detailed kerogens.