Table 1.

Spectrophotometric and low-resolution mass spectrometric data of the studied betanin, decarboxylated betanins and their derivatives.

No.	Compound	λmax [nm]	m/z [M + H]+	m/z from MS/MS of [M + H]+
1	betanin	538	551	389
1a	18-chloro-betanin	522	585	423
2	17-decarboxy-betanin	505	507	345
2a	18-chloro-17-decarboxy-betanin	524	541	379
3	15-decarboxy-betanin	528	507	345
3a	18-chloro-15-decarboxy-betanin	514	541	379
4	2-decarboxy-betanin	533	507	345
4a	18-chloro-2-decarboxy-betanin	525	541	379
5	betanidin	540	389	345
5a	18-chloro-betanidin	528	423	377
6/6’	2,17-bidecarboxy-betanin/-isobetanin	507	463	301
6a	18-chloro-2,17-bidecarboxy-betanin	519	497	335
7	neobetanin	466	549	387; 343; 299