Resistant biomacromolecules in marine microalgae of the classes Eustigmatophyceae and Chlorophyceae: Geochemical implications |
| |
Authors: | Franois Gelin Ilco Boogers Anna A M Noordeloos Jaap S Sinninghe Damste Roel Riegman Jan W De Leeuw |
| |
Institution: | François Gelin, Ilco Boogers, Anna A. M. Noordeloos, Jaap S. Sinninghe Damste, Roel Riegman,Jan W. De Leeuw |
| |
Abstract: | Non-hydrolysable macromolecular constituents (i.e. algaenans) were isolated from two out of seven marine microalgae investigated. Nannochloropsis salina and Nannochloropsis sp. from the class of Eustigmatophyceae produce highly aliphatic algaenans. Flash pyrolysis and chemical degradations with HI and RuO4 allowed for the identification of their chemical structure, which is mainly composed of polyether-linked long-chain (up to C36) n-alkyl units. The building blocks of this polymer were also recognized in lipid fractions. The green microalgae (Chlorophyceae) Chlorella spaerckii, Chlorococcum sp. and Nannochloris sp. were earlier thought to biosynthesize algaenans comprising aliphatic and/or aromatic moieties. However, a new isolation method utilizing trifluoroacetic acid (TFA) prior to the other hydrolyses revealed that the macromolecular material isolated from these three chlorophytes was either hydrolysable with TFA or artefacts from the former method. Similar to algaenans from fresh water green microalgae, the aliphatic eustigmatophyte algaenans are likely to be selectively preserved in depositional environments and might ultimately serve as source rock organic matter of marine crude oils. Furthermore, they may play an important role in the cycling of carbon. |
| |
Keywords: | marine microalgae Eustigmatophyceae Chlorophyceae algaenan long-chain diols selective preservation kerogen flash pyrolysis |
本文献已被 ScienceDirect 等数据库收录! |
|