Carbon δ (ppm)
Lactobionic acid Lactone
C1 178.69 173.56
C1’ 103.64 103.43
C2 71.88 71.83
C2’ 72.27 72.02
C3 71.28 71.48
C3’ 81.68 80.61
C4 72.85 72.92
C4’ 68.84 68.98
C5 71.66 70.74
C5’ 75.51 75.87
C6 62.09 61.51
C6’ 61.24 59.98
Table 3: 13C-NMR chemical shifts corresponding to lactobionic acid and lactone (Varian AS-400).