The absolute intensities of reference and un known spectra are correlated by the measurement of a precise 360 pulse, direct consequence of the principle of reciprocity (Wider & Dreier, 2006). In addition, the capability of NMR to quantify multiple compounds in a mixture, from just one measurement, is a clear advantage over the targeted standard analytical routines, where prior separation of components is often needed, as it allows detection of the appearance of unexpected ingredients and consequently of unknown frauds. The SGF method is constantly being updated; currently concentrations of more than 30 different compounds are determined (depending on the type of juice). Furthermore, meaningful internal relations of these values are cal culated, such as the ratio of glucose and fructose or the ratio of sucrose versus total sugar.