Elsevier, Tetrahedron Letters, 32(39), p. 5771-5774
DOI: 10.1016/s0040-4039(98)01205-2
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Decolourization of anthocyanins by sulfur dioxide is investigated through the reaction between sodium bisulfite and malvidin 3-O-glucoside. The structural elucidation of the C-4 sulfonate adducts is established by 1H, 13C and 33S NMR spectroscopies.