Attached proton test example

Several experiments are suitable for recording anthocyanin 1-D 13C NMR spectra. For example, in Fig. FI.4.2 the authors have used a compensated attached proton test (CAPT Torres et al., 1993 Braun et al., 1998). 

As an example, we discuss the so-called attached-proton test (APT). It involves the use of a spin echo, which is produced by a sequence of two pulses, as shown in Figure 3. 

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