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Fig. 3 | AMB Express

Fig. 3

From: Asphaltene biotransformation for heavy oil upgradation

Fig. 3

Changes in the composition of asphaltene due to biotransformation. a FT-IR spectrum of the control asphaltene. b FT-IR spectrum of the biotransformed asphaltene showing incorporation of oxygen in the structure of asphaltene. c 1H-NMR spectrum (zoomed) of control asphaltene. d 1H-NMR spectrum (zoomed) of the biotransformed asphaltene showing disappearance of sulfur, nitrogen and formation of oxygenates in the structure of asphaltene due to biotransformation

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