The 13 C-NMR spectral shifts offer valuable insights into the structural characteristics of SAF composition of SAF, primarily composed hydrocarbons . The patterns shown by the NMR spectra reflect differences and similarities in the composition of a fuel which is a mixture of a number of compounds . By leveraging the distinct chemical shifts associated with both saturated and unsaturated hydrocarbons, one can discern the composition and structural diversity within the fuel mixture. This understanding is pivotal for comprehending fuel properties, performance, and potential implications for engine operation and emission . The chemical shifts observed in the 13 C-NMR spectrum provide crucial information about the electronic , can be as large as 74 ppm due to the strain.