Figure 5. Comparison of a 400 MHz (above) and a 60 MHz (below) ¹H-NMR-spectrum of a Mirabelle plum brandy that contains maleic acid as an internal standard. The integrals show the intensities of the signals of the protons of maleic acid (δ = 6.3 ppm; vinyl protons), water (and the hydroxy groups of the alcoholic compounds at δ = 4.8 ppm), the methyl group of methanol (δ = 3.3 ppm) and the methyl group of ethanol (δ = 1.1 ppm) [3].

From

Low-field NMR Spectroscopy in Chemical Education

Marcel Emmert, Ekkehard Geidel

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