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. 2017 Apr 20;7:44538. doi: 10.1038/srep44538

Table 2. List of the assigned oligosaccharides of the digested samples in this study (i.e. gum arabic mass fingerprint).

Theoretical mass [Da]* Possible oligosaccharide* Analyzed samples
A. Std sample B. AS1 sample C. AS2 sample D. AS3 sample E. n 278 sample F. n 588 sample G. 50-year old H. 1870s sample I. Dove 1 J. Dove 2 K. Dove 3
601.22 PentHex2 [3-AQ/M + H]+ X — X X ** ** X — X X X
623.21 PentHex2 [3-AQ/M+Na]+ X — — — ** ** X — — X X
629.22 HexdHexHexA [3-AQ/M+H]+ X X X X ** ** X X X — —
639.18 PentHex2 [3-AQ/M+K]+ X — — — ** ** X — X X X
651.20 HexdHexHexA [3-AQ/M+Na]+ X X X X ** ** X — X X X
667.18 HexdHexHexA [3-AQ/M+K]+ X X X X ** ** X X X X X
733.27 Pent2Hex2 [3-AQ/M+H]+ X X X X ** ** X X X X X
755.25 Pent2Hex2 [3-AQ/M+Na]+ X X X X ** ** X X X X X
763.28 PentHex3 [3-AQ/M+H]+ X X X X ** ** X X — X —
771.22 Pent2Hex2 [3-AQ/M+K]+ X X X X ** ** X X X X X
785.26 PentHex3 [3-AQ/M+Na]+ X — X X ** ** — — — — X
791.27 Hex2dHexHexA [3-AQ/M+H]+ X X X X ** ** X X X — —
801.23 PentHex3 [3-AQ/M+K]+ X — X X ** ** —   X X X
813.25 Hex2dHexHexA [3-AQ/M+Na]+ X X X X ** ** X X X X X
829.23 Hex2dHexHexA [3-AQ/M+K]+ X X X X ** ** X X X — X
895.32 Pent2Hex3 [3-AQ/M+H]+ X X X X X X X X X X X
917.30 Pent2Hex3 [3-AQ/M+Na]+ X X X X X X X X X X X
923.31 PentHex2dHexHexA [3-AQ/M+H]+ X X X X X X X X X X X
933.28 Pent2Hex3 [3-AQ/M+K]+ X X X X X X X X X X X
945.30 PentHex2dHexHexA [3-AQ/M+Na]+ X X X X X X X X X X X
961.27 PentHex2dHexHexA [3-AQ/M+K]+ X X X X X X X X X X X
1055.36 Pent2Hex2dHexHexA [3-AQ/M+H]+ X X X X X X X X X X X
1077.34 Pent2Hex2dHexHexA [3-AQ/M+Na]+ X X X X X X X X X X X
1085.37 PentHex3dHexHexA [3-AQ/M+H]+ X X X X X X X X X X X
1093.31 Pent2Hex2dHexHexA [3-AQ/M+K]+ X X X X X X X X X X X
1107.35 PentHex3dHexHexA [3-AQ/M+Na]+ X X X X X X X X X X X
1123.32 PentHex3dHexHexA [3-AQ/M+K]+ X X X X X X X X X X X
1187.40 Pent3Hex2dHexHexA [3-AQ/M+H]+ X X X X X X X X — — —
1187.43 Pent2Hex3dHex2 [3-AQ/M + H]+
1209.38 Pent3Hex2dHexHexA [3-AQ/M + Na]+ X X X X X X X X X X X
1209.42 Pent2Hex3dHex2 [3-AQ/M + Na]+ X — X
1217.41 Pent2Hex3dHexHexA [3-AQ/M + H]+ X X X X X X X X X X X
1225.35 Pent3Hex2dHexHexA [3-AQ/M + K]+ X X X X X X X X X X X
1225.39 Pent2Hex3dHex2 [3-AQ/M + K]+ X X X
1239.39 Pent2Hex3dHexHexA [3-AQ/M + Na]+ X X X X X X X X X X X
1255.37 Pent2Hex3dHexHexA [3-AQ/M + K]+ X X X X X X X X X X X

A. standard sample from Acacia senegal var. senegal from Zecchi (Florence, Italy) (noted Std; related spectrum: Fig. 1A); B, C and D. Acacia senegal var. senegal AS1, AS2 and AS3 respectively collected in Kordufan (Western Sudan) in 1994, Damazene (Southeast Sudan) in 1999 and Damazene (Southeast wSudan) in 1994 (related spectra: Supplementary Fig. 2); E and F. contemporary watercolors purchased from Maimeri (Mediglia, Italy; sample n. 278) and Daler-Rowney (Bracknell, England; n. 588) (related spectra: Supplementary Fig. 5). G. The 50 year old gum arabic (Acacia senegal var. Senegal) (Winsor and Newton) (related spectrum: Supplementary Fig. 3); H. The blue watercolor sample from a wooden box ‘Colour Box Charles Roberson & Co’ dating 1870s (related spectra: Fig. 3). I. The green and opaque sample (noted Dove 1) from Boat Houses (Arthur Dove 1935, The Metropolitan Museum of Art #2005.484.3) (related spectrum: Fig. 4A); J. The grey sample (noted Dove 2) from Study for ‘Goat’ (Arthur Dove 1934, The Metropolitan Museum of Art #49.70.75) (related spectrum: Fig. 4B); K. The light blue sample (noted Dove 3) from Study for ‘Goat’ (Arthur Dove 1934, The Metropolitan Museum of Art #49.70.75) (related spectrum: Fig. 4C). The presence of the oligossacharides in the mass fingerprint of each sample is marked by X, the absence of the oligossacharides is noted -.

*Oligosaccharides are derivatized with 3-aminoquinoline (3-AQ) and charged with H+, Na+ or K+. The order of monosaccharides for each oligosaccharide is arbitrary and does not refer to its structure.

**Oligosaccharides detected but in a m/z range containing contaminations.