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. 2023 Nov 20;20:101020. doi: 10.1016/j.fochx.2023.101020

Table 2.

The changes in FTIR spectra of sodium copper chlorophyllin (SCC) in the absence/presence of the stabilizers at pH = 3.5.

Wavenumber (cm−1) Origin * Changes of wavenumbers (cm−1)
SCC + CMC + Gum Arabic + Pectin + Xanthan Gum + PS80
710 or 746.57 Metal atom (Cu), 750–570 Removed 711 Re or removed 711 Re or removed 702 Re or removed 722.8 Re or removed 722 Re or removed
820.1 Metal ligand (M−N) 815.7 Br, Lre 804.6 Br, In 806.2 Br, In 803.9 Re 806.2 Br 804.1 Br
922.3 Metal ligand (M−N) 935.3 Lre 933.9 Lin 931 Lre 925 Re 939.4 Re 946.7 In
950 Vinyl C—H out-of-plane bend Removed Removed Removed Removed Removed Masked
987.7 C—H (963–1077), C—C stretching and bending vibrations in the pyrrole ring (922–988) Removed Overlap Overlap Overlap Removed Removed
1073.7 C Created by potrace 1.16, written by Peter Selinger 2001-2019 O C—O stretching vibrations 1080.6 Lin 1079.5 In 1076 In 1077.7 In 1079.2 In Overlapped
1218.5 COO– (1058–1238), skeletal C—C vibrations, or aromatic C—H in-plane bend, stretching vibrations of C—O—C ester bonds 1229.2 In, Br 1227.2 In, Br 1228.3 In, Br 1230.3 In, Br 1231.0 In, Br 1237.7 In, Br
1273.8 Stretching mode of C-173–O and C-133–O in ester groups C—N stretching vibrations Overlap Overlap Overlap Overlap Overlap Overlap
1400.9 Aromatic ring (1395–1457 and
C—O stretching vibrations		 1380 Lre 1403.6 In 1405.3 In 1415.6 Re 1402.9 Br, In 1398.1 Re
1570.9 C Created by potrace 1.16, written by Peter Selinger 2001-2019 C and C Created by potrace 1.16, written by Peter Selinger 2001-2019 N in the highly conjugated system of tetrapyrrole system 1591.4 Re 1586.1 Re 1592.4 Re 1591.6 Re 1590.8 Re 1593.8 Re
∼1620 shoulder Stretching mode of the aldehyde or carboxylate carbonyl group ∼1620 Re Disappeared Disappeared Disappeared Disappeared Disappeared
2854.8 shoulder C—H stretching of aldehyde group 2852 Re 2848 Lin, Br Lin, Br Removed 2856.4 Lre 2872.2 In
2923.8 C—H stretching of the methyl, methylene, or methine group in phytol 2930.7 Re 2936.1 Lin, Br 2928.3 Lin, Br 2936.2 Re, Br 2929.4 Lre 2926.1 In, Br
2953.4 shoulder Asymmetric C—H stretching mode of the –CH3 group 2960 Re Masked Masked Disappeared Disappeared Masked
3417.3 (∼300–3680) O—H and N—H stretching mode 3455.3 (∼2990–3733) In, Br 3463.1 (∼3000–3750) In, Br 3450.6 (∼3027––3770) In, Br 3450.8 (∼3050–3700) In, Br 3462.7 (∼3000–3695) In, Br 3446.8 (∼3000–3690) In

SCC: Sodium copper cholorophyllin, SC: Sodium citrate, CA: Citric acid, SCS: SCC + CA + SC, CMC: Carboxymethyl cellulose, GA: Gum Arabic, PE: Pectin, XG: Xanthan gum, PS80: Polysorbate 80/Tween 80, Re: Reduced intensity, In: Increased intensity, Lre/in: Little reduced/increased intensity, Br: Broadened band.