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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.
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Biotechnology for Biofuels and Bioproducts

ISSN: 2731-3654

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