The infrared absorption spectrum bands of kerogen functional groups and pyrolysis products Pyrolysis product/ Wavenumber, [cm.sup.-1] Functional group [H.sub.2]O 4000-3100, 1900-1300 C[H.sub.4] 3014 C[O.sub.2] 2400-2240, 780-560 CO 2240-2060 O-H stretching 4000-3100 C-H stretching 3100-3000 (adjacent to a double bond or aromatic ring), 30002800 (aliphatic compounds
) C=O stretching 1850-1600 (carbonyl compounds: ketone acid, aldehyde, ester, acyl amide, acyl chloride estolide, etc.) C-H bending 1500-1300 (saturated aliphatic hydrocarbons), 1300-900 (unsaturated aliphatic hydrocarbons), 750-400 (aromatic rings) Table 5.
The spectrum contains no signals attributable to other aliphatic compounds
, unless these occur in trace amounts.
non-hydrolysable aliphatic compounds
that resist aqueous dichromate oxidation (Knicker et al.
The chemical constituents reported from this shrub belong to different classes, such as alkaloids, diterpenoid lactones, glycosides, steroids, sesquiterpenoid, phenolics, aliphatic compounds
First discovered in 2011 by IBN Team Leader and Principal Research Scientist Dr Charlotte Hauser, the peptides were formed from only 3-7 amino acids, making them the smallest ever reported class of self-assembling aliphatic compounds
. Peptides perform a wide range of functions in the body, and are distinguished from proteins based on size.
and Gustafsson, O.: 2004, Efficient isolation of polyaromatic fraction from aliphatic compounds
in complex extracts using dimethylformamide-pentane partitionings.
like alkane and alkene compounds carbon chain start from small to long chain hydrocarbon showing in this fuel is [C.sub.4]-[C.sub.28].
The peak reduction is a strong reason for degradation, as it shows a significant reduction in aliphatic compounds
under equal condition.
They represent different classes of compounds such as alkaloids, diterpenoid lactones, phenolics and their glycosides, sesquiterpenoids, steroids, aliphatic compounds
and polysaccharides (for review Singh et al., 2003).