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Table 2 Peaks assignment and corresponding integrals of the 1 H HR-NMR spectra of samples A and B

From: Novel 1H low field nuclear magnetic resonance applications for the field of biodiesel

Peak number Functional groupa Chemical shifta [ppm] Sample Ab integral [nu] Sample Bb integral [nu]
1 -OCO-CH2- (Acyl group) 2.23-2.36 0.78 0.80
2 R-OCO-CH3 (Methyl ester group) 3.7 0.64 1.12
3 -CH2OCOR (Glycerol group) 4.1-4.32 0.25 0.01
  1. a Peaks were assigned according to Meher et al. [65] and Guillén and Ruiz [67].
  2. b Rapeseed biodiesels A and B were prepared using 0.05% and 0.5% (w/w) KOH catalyst respectively.