IR Spectra for Carbohydrates
Table: IR Spectra of Sucrose.
Material | Wavenumber (cm⁻¹) | Assignment | Annotations | Ref | Solid Sucrose | 1461 | R1 | Solid Sucrose | 1431 | δC-O-H | R1 | Solid Sucrose | 1410 | R1 | Solid Sucrose | 1370 | δC-O-H gluc | R1 | Solid Sucrose | 1346 | δC-O-H fruc | R1 | Solid Sucrose | 1323 | R1 | Solid Sucrose | 1280 | R1 | Solid Sucrose | 1239 | ωCH₂ | R1 | Solid Sucrose | 1162 | R1 | Solid Sucrose | 1130 | νCO endo fruc | R1 | Solid Sucrose | 1106 | νC-O endo gluc | R1 | Solid Sucrose | 1069 | R1 | Solid Sucrose | 1052 | νC-O | R1 | Solid Sucrose | 1008 | δC-O-H | R1 | Solid Sucrose | 990 | νC-O exo | R1 | Solid Sucrose | 941 | νC-C gluc | R1 | Solid Sucrose | 911 | νC-C fruc | R1 | Solid Sucrose | 867 | νC-C | R1 | Solid Sucrose | 849 | R1 | Aqueous Sucrose | 1640 | ν₂ H₂O | R1 | Aqueous Sucrose | 1451 | R1 | Aqueous Sucrose | 1430 | δC-O-H | R1 | Aqueous Sucrose | 1366 | δC-O-H gluc | R1 | Aqueous Sucrose | 1336 | δC-O-H fruc | R1 | Aqueous Sucrose | 1265 | δCH₂ | R1 | Aqueous Sucrose | 1247 | ωCH₂ | R1 | Aqueous Sucrose | 1136 | νCO endo fruc | R1 | Aqueous Sucrose | 1113 | νC-O endo gluc | R1 | Aqueous Sucrose | 1055 | νC-O | R1 | Aqueous Sucrose | 993 | νC-O exo | R1 | Aqueous Sucrose | 945 | νC-C gluc | R1 | Aqueous Sucrose | 925 | νC-C fruc | R1 | Aqueous Sucrose | 870 | νC-C | R1 | Aqueous Sucrose | 835 | δC₂-C₁-H gluc | R1 | Aqueous Sucrose | 828 | δC₃-C₂-H fruc | R1 | Sucrose (H₂O)₅ | ~3350 | ν₃ H₂O + νOH | R2 | Sucrose (H₂O)₅ | ~3240 | ν₁ H₂O + νOH | R2 | Sucrose (H₂O)₅ | 2974 | νCH₃ as | R2 | Sucrose (H₂O)₅ | 2938 | νCH₂ as | R2 | Sucrose (H₂O)₅ | 2882 | νCH₂ s | R2 | Sucrose (H₂O)₅ | 2850 | comb. | R2 | Sucrose (H₂O)₅ | 2680 | comb. | R2 | Sucrose (H₂O)₅ | ~2500 | comb. | R2 | Sucrose (H₂O)₅ | ~2125 | ν₂ H₂O + νLH₂O | R2 | Sucrose (H₂O)₅ | 1645 | ν₂ H₂O | R2 | Sucrose (H₂O)₅ | 1454 | R2 | Sucrose (H₂O)₅ | 1425 | δC-O-H | R2 | Sucrose (H₂O)₅ | 1370 | δC-O-H gluc | R2 | Sucrose (H₂O)₅ | 1333 | δC-O-H fruc | R2 | Sucrose (H₂O)₅ | 1275 | δCH₂ | R2 | Sucrose (H₂O)₅ | 1210 | R2 | Sucrose (H₂O)₅ | 1135 | νCO endo fruc | R2 | Sucrose (H₂O)₅ | 1113 | νC-O endo gluc | R2 | Sucrose (H₂O)₅ | 1055 | νC-O | vs | R2 | Sucrose (H₂O)₅ | 998 | νC-O exo | vs | R2 | Sucrose (H₂O)₅ | 929 | νC-C fruc | R2 | Sucrose (H₂O)₅ | 868 | νC-C | R2 | Sucrose (H₂O)₂ | ~3290 | ν₃ H₂O + νOH | R2 | Sucrose (H₂O)₂ | ~3240 | ν₁ H₂O + νOH | R2 | Sucrose (H₂O)₂ | 2970 | νCH₃ as | R2 | Sucrose (H₂O)₂ | 2933 | νCH₂ as | R2 | Sucrose (H₂O)₂ | 2880 | νCH₂ s | R2 | Sucrose (H₂O)₂ | 2843 | comb. | R2 | Sucrose (H₂O)₂ | 2680 | comb. | R2 | Sucrose (H₂O)₂ | ~2500 | comb. | R2 | Sucrose (H₂O)₂ | ~2125 | ν₂ H₂O + νLH₂O | R2 | Sucrose (H₂O)₂ | 1648 | ν₂ H₂O | R2 | Sucrose (H₂O)₂ | 1452 | R2 | Sucrose (H₂O)₂ | 1420 | δC-O-H | R2 | Sucrose (H₂O)₂ | 1370 | δC-O-H gluc | R2 | Sucrose (H₂O)₂ | 1331 | δC-O-H fruc | R2 | Sucrose (H₂O)₂ | 1270 | δCH₂ | R2 | Sucrose (H₂O)₂ | 1210 | R2 | Sucrose (H₂O)₂ | 1132 | νCO endo fruc | R2 | Sucrose (H₂O)₂ | 1110 | νC-O endo gluc | R2 | Sucrose (H₂O)₂ | 1045 | νC-O | vs | R2 | Sucrose (H₂O)₂ | 993 | νC-O exo | vs | R2 | Sucrose (H₂O)₂ | 928 | νC-C fruc | R2 | Sucrose (H₂O)₂ | 868 | νC-C | R2 | Sucrose (H₂O)₂ | 830 | δC₃-C₂-H fruc | R2 |
---|
NOMENCLATURE:
References:
R1: Kodad H., Mokhlisse R., Davin E., Mille G. Etude IRTF Par Reflexion Totale Attenuee (ATR) De Sucres en Solution Aqueuse. Can. J. Appl. Spectrosc. 1994;39:107–112.
R2: Max, J.-J., & Chapados, C. (2001). Sucrose Hydrates in Aqueous Solution by IR Spectroscopy. The Journal of Physical Chemistry A, 105(47), 10681–10688. DOI: https://doi.org/10.1021/jp012809j
Table: IR spectra of Glucose.
Material | Wavenumber (cm⁻¹) | Assignment | Annotations | Ref | Glucose (H₂O)₅ | ~5187 | R3 | Glucose (H₂O)₅ | ~3612 | R3 | Glucose (H₂O)₅ | 3530 | R3 | Glucose (H₂O)₅ | 3385 | ν₃ H₂O + νOH | R3 | Glucose (H₂O)₅ | 3212 | ν₁ H₂O + νOH | R3 | Glucose (H₂O)₅ | 2925 | νCH₂ as | R3 | Glucose (H₂O)₅ | 2870 | νCH₂ s | R3 | Glucose (H₂O)₅ | ~2120 | ν₂ H₂O + νLH₂O | R3 | Glucose (H₂O)₅ | 1640 | ν₂ H₂O | R3 | Glucose (H₂O)₅ | 1435 | δC-O-H | w | R3 | Glucose (H₂O)₅ | 1368 | δC-O-H gluc | R3 | Glucose (H₂O)₅ | 1316 | R3 | Glucose (H₂O)₅ | 1288 | R3 | Glucose (H₂O)₅ | 1263 | δCH₂ | R3 | Glucose (H₂O)₅ | 1230 | ωCH₂ | R3 | Glucose (H₂O)₅ | 1201 | R3 | Glucose (H₂O)₅ | 1158 | R3 | Glucose (H₂O)₅ | 1132 | νCO endo fruc | sh | R3 | Glucose (H₂O)₅ | 1106 | νC-O endo gluc | sh | R3 | Glucose (H₂O)₅ | 1081 | s | R3 | Glucose (H₂O)₅ | 1058 | νC-O | R3 | Glucose (H₂O)₅ | 1034 | s | R3 | Glucose (H₂O)₅ | 1013 | δC-O-H | R3 | Glucose (H₂O)₅ | 991.5 | νC-O exo | R3 | Glucose (H₂O)₅ | 936 | νC-C gluc | R3 | Glucose (H₂O)₅ | 895 | νC-C fruc | R3 | Glucose (H₂O)₅ | 863 | νC-C | R3 | Glucose (H₂O)₅ | 837 | δC₂-C₁-H gluc | R3 | Glucose (H₂O)₂ | 3505 | R3 | Glucose (H₂O)₂ | 3380 | ν₃ H₂O + νOH | R3 | Glucose (H₂O)₂ | 3225 | ν₁ H₂O + νOH | d | R3 | Glucose (H₂O)₂ | 2930 | νCH₂ as | R3 | Glucose (H₂O)₂ | 2885 | νCH₂ s | R3 | Glucose (H₂O)₂ | 2860 | comb. | R3 | Glucose (H₂O)₂ | 2130 | ν₂ H₂O + νLH₂O | R3 | Glucose (H₂O)₂ | 1642 | ν₂ H₂O | R3 | Glucose (H₂O)₂ | 1462 | R3 | Glucose (H₂O)₂ | 1420 | δC-O-H | R3 | Glucose (H₂O)₂ | 1362 | δC-O-H gluc | R3 | Glucose (H₂O)₂ | 1335 | δC-O-H fruc | R3 | Glucose (H₂O)₂ | 1315 | R3 | Glucose (H₂O)₂ | 1284 | R3 | Glucose (H₂O)₂ | 1260 | δCH₂ | R3 | Glucose (H₂O)₂ | 1226 | ωCH₂ | R3 | Glucose (H₂O)₂ | 1199 | R3 | Glucose (H₂O)₂ | 1151 | R3 | Glucose (H₂O)₂ | 1102 | νC-O endo gluc | R3 | Glucose (H₂O)₂ | 1076 | m | R3 | Glucose (H₂O)₂ | 1053 | νC-O | sh | R3 | Glucose (H₂O)₂ | 1027 | m | R3 | Glucose (H₂O)₂ | 1008 | δC-O-H | sh | R3 | Glucose (H₂O)₂ | 988 | νC-O exo | R3 | Glucose (H₂O)₂ | 919 | R3 | Glucose (H₂O)₂ | 895 | νC-C fruc | R3 | Glucose (H₂O)₂ | 863 | νC-C | R3 | Glucose (H₂O)₂ | 841 | δC₂-C₁-H gluc | R3 | Glucose (H₂O)₂ | 769 | R3 |
---|
NOMENCLATURE:
References:
R3: Max, J.-J., & Chapados, C. (2007). Glucose and Fructose Hydrates in Aqueous Solution by IR Spectroscopy. The Journal of Physical Chemistry A, 111(14), 2679–2689. DOI: https://doi.org/10.1021/jp066882r
Table: IR spectra of Fructose.
Material | Wavenumber (cm⁻¹) | Assignment | Annotations | Ref | Fructose (H₂O)₅ | ~5180 | R3 | Fructose (H₂O)₅ | 3520 | R3 | Fructose (H₂O)₅ | 3385 | ν₃ H₂O + νOH | R3 | Fructose (H₂O)₅ | 3225 | ν₁ H₂O + νOH | R3 | Fructose (H₂O)₅ | 2986 | νCH₃ as | R3 | Fructose (H₂O)₅ | 2946 | νCH₂ as | R3 | Fructose (H₂O)₅ | 2887 | νCH₂ s | R3 | Fructose (H₂O)₅ | ~2855 | comb. | R3 | Fructose (H₂O)₅ | 2125 | ν₂ H₂O + νLH₂O | R3 | Fructose (H₂O)₅ | 1645 | ν₂ H₂O | R3 | Fructose (H₂O)₅ | 1458 | R3 | Fructose (H₂O)₅ | 1429 | δC-O-H | R3 | Fructose (H₂O)₅ | 1410 | R3 | Fructose (H₂O)₅ | 1375 | δC-O-H gluc | R3 | Fructose (H₂O)₅ | 1344 | δC-O-H fruc | R3 | Fructose (H₂O)₅ | 1318 | R3 | Fructose (H₂O)₅ | 1299 | R3 | Fructose (H₂O)₅ | 1264 | δCH₂ | R3 | Fructose (H₂O)₅ | 1243 | ωCH₂ | R3 | Fructose (H₂O)₅ | 1218 | R3 | Fructose (H₂O)₅ | 1187 | R3 | Fructose (H₂O)₅ | 1158 | R3 | Fructose (H₂O)₅ | 1104 | νC-O endo gluc | m | R3 | Fructose (H₂O)₅ | 1084 | m | R3 | Fructose (H₂O)₅ | 1062 | νC-O | s | R3 | Fructose (H₂O)₅ | 1033 | sh | R3 | Fructose (H₂O)₅ | 1014 | δC-O-H | sh | R3 | Fructose (H₂O)₅ | 993 | νC-O exo | R3 | Fructose (H₂O)₅ | 980 | m | R3 | Fructose (H₂O)₅ | 966 | m | R3 | Fructose (H₂O)₅ | 936 | νC-C gluc | R3 | Fructose (H₂O)₅ | 919 | R3 | Fructose (H₂O)₅ | ~891 | νC-C fruc | R3 | Fructose (H₂O)₅ | 868 | νC-C | m, d | R3 | Fructose (H₂O)₅ | 838 | δC₂-C₁-H gluc | R3 | Fructose (H₂O)₅ | 820 | δC₃-C₂-H fruc | m | R3 | Fructose (H₂O) | ~3510 | R3 | Fructose (H₂O) | 3369 | ν₃ H₂O + νOH | R3 | Fructose (H₂O) | 3236 | ν₁ H₂O + νOH | R3 | Fructose (H₂O) | 2981 | νCH₃ as | R3 | Fructose (H₂O) | 2940 | νCH₂ as | R3 | Fructose (H₂O) | 2884 | νCH₂ s | R3 | Fructose (H₂O) | -2505 | comb. | R3 | Fructose (H₂O) | 2122 | ν₂ H₂O + νLH₂O | R3 | Fructose (H₂O) | 1648 | ν₂ H₂O | R3 | Fructose (H₂O) | 1457 | R3 | Fructose (H₂O) | ~1425 | δC-O-H | R3 | Fructose (H₂O) | 1407 | R3 | Fructose (H₂O) | 1374 | δC-O-H gluc | R3 | Fructose (H₂O) | 1342 | δC-O-H fruc | R3 | Fructose (H₂O) | 1294 | R3 | Fructose (H₂O) | 1262 | δCH₂ | R3 | Fructose (H₂O) | 1236 | ωCH₂ | R3 | Fructose (H₂O) | 1185 | R3 | Fructose (H₂O) | 1152 | R3 | Fructose (H₂O) | 1102 | νC-O endo gluc | m | R3 | Fructose (H₂O) | 1080 | m | R3 | Fructose (H₂O) | 1053 | νC-O | s | R3 | Fructose (H₂O) | 1028 | sh | R3 | Fructose (H₂O) | 1010 | δC-O-H | sh | R3 | Fructose (H₂O) | ~994 | νC-O exo | R3 | Fructose (H₂O) | 978 | m | R3 | Fructose (H₂O) | 963 | m | R3 | Fructose (H₂O) | 936 | νC-C gluc | R3 | Fructose (H₂O) | 918 | R3 | Fructose (H₂O) | 895 | νC-C fruc | R3 | Fructose (H₂O) | 866 | νC-C | m, d | R3 | Fructose (H₂O) | 839 | δC₂-C₁-H gluc | R3 | Fructose (H₂O) | 817 | δC₃-C₂-H fruc | m | R3 | Fructose (H₂O) | 797 | R3 | Fructose (H₂O) | 778 | m | R3 | Fructose (H₂O) | ~740 | R3 |
---|
NOMENCLATURE:
References:
R3: Max, J.-J., & Chapados, C. (2007). Glucose and Fructose Hydrates in Aqueous Solution by IR Spectroscopy. The Journal of Physical Chemistry A, 111(14), 2679–2689. DOI: https://doi.org/10.1021/jp066882r
Table 1: Comparisons between both experimental and BLYP calculated Infrared frequencies in cm-1 for both α- D-Glucose and β-D-Fructose as well as α- D-Glucose and β-D-Fructose monohydrates.
D-Glucose | D-Fructose | ||||||||
---|---|---|---|---|---|---|---|---|---|
IR | α-D | β-D-M | Assignment | IR | α-D | β-D-M | Assignment | ||
3410 | 3418 | 3146 | ν OH | 3393 | 3428 | 3513 | ν OH | ||
3393 | 3408 | 3123 | ν OH | 2933 | 2975 | 2957 | νs CH of C2 | ||
2944 | 2963 | 3099 | νs CH of C2 | 2899 | 2923 | 2925 | νas CH of C1 | ||
2913 | 2939 | 3085 | νas CH of C1 | 1637 | 1634 | 1665 | δOH | ||
1460 | 1441 | 1465 | δCH2 + δOH + δCCH | 1402 | 1392 | 1417 | δOCH + δ COH + δ CCH | ||
1382 | 1352 | 1390 | δOCH + δ COH + δ CCH | 1340 | 1330 | 1338 | Δ CCH + δ OCH | ||
1340 | 1330 | 1320 | δ CCH + δ OCH | 1265 | 1276 | 1292 | δCH + δOH in plane, δ CCO | ||
1244 | 1218 | 1278 | δCH + δOH in plane | 1203 | 1220 | 1232 | δCH + δOH in plane | ||
1149 | 1137 | 1205 | ν CO + ν CC | 1149 | 1148 | 1166 | ν CO + νCC + δ CCO | ||
1111 | 1116 | 1162 | ν CO | 1057 | 1082 | 1059 | νCO | ||
1050 | 1088 | 1082 | ν CO + ν CC | 977 | 990 | 990 | νCO + δCCO | ||
995 | 944 | 1032 | ν CO + ν CC | 873 | 856 | 908 | δCH + νCC + δCCH | ||
915 | 900 | 993 | ν CO + ν CCH + νas ring of pyranose | 818 | 816 | 884 | δCCO + δCCH | ||
837 | 834 | 909 | δCH | 780 | 784 | 828 | δCCO + δ CCH | ||
622 | 619 | 694 | δ CCO + δ CCH CH2 | 648 | 624 | 658 | CH2 + CH |
NOMENCLATURE:
NOTE:
Reference: Ibrahim, M. A., Allam, M., El-Haes, H., Jalbout, A. F., & De Leon, A. (2006). Analysis of the structure and vibrational spectra of glucose and fructose. Ecletica Quimica, 31(3), 15–21. DOI: https://doi.org/10.26850/1678-4618eqj.v31.3.2006.p15-21
Table 2: FTIR Spectra of Lauric Acid, Dextran, and Dextran-g-Lauric Acid.
Peak (cm⁻¹) | Functional Group | Lauric Acid | Unmodified Dextran | Dextran (Mw 6k, 24h) | Dextran (Mw 6k, 48h) | Dextran (Mw 40k, 24h) |
---|---|---|---|---|---|---|
3365 | –OH Stretching | ✓ | ✓ | |||
2931 | –CH Stretching | ✓ | ✓ | ✓ | ✓ | ✓ |
2851 | –CH Stretching | ✓ | ✓ | ✓ | ✓ | ✓ |
1721 | C=O Stretching | ✓ | ||||
1700 | C=O Stretching | ✓ | ||||
1648 | C=O Stretching | ✓ | ✓ |
NOMENCLATURE:
NOTE:
Reference: Su, C.-M., Lin, C., Huang, C.-Y., Yeh, J.-C., Tsai, T.-Y., Ger, T. R., Wang, M.-C., & Lou, S.-L. (2017). Dextran-g-lauric acid as IKK complex inhibitor carrier. RSC Advances, 7(89), 56247–56255. DOI: https://doi.org/10.1039/c7ra04544a
Table 3: Relocation of Key Maize Starch FTIR Bands After Treatment with Aqueous Na Silicate Solutions.
Native Starch (cm⁻¹) | Starch at Water/Na Silicate Ratio 80 mL/g (cm⁻¹) | 70 mL/g (cm⁻¹) | 60 mL/g (cm⁻¹) | 50 mL/g (cm⁻¹) |
---|---|---|---|---|
524 | 520 | 520 | 514 | – |
578 | 578 | 578 | 570 | 558 |
738 | 700 | 700 | 700 | – |
784 | 765 | 765 | 750 | – |
880 | 880 | 874 | 854 | – |
944 | 941 | 929 | 900 | 900 |
1000 | 996, 1017 (Split) | 996, 1017 (Split) | 996, 1017 (Split) | 1000 |
1090 | 1090 | 1078 | 1078 | 1052 |
1180 | 1175 | 1150 | 1150 | 1121 |
1380 | 1380 | 1376 | 1347 | – |
1450 | 1450 | 1429 | 1381 | – |
1478 | 1476 | 1460 | 1423 | 1448 |
1649 | 1644 | 1642 | 1626 | 1626 |
2948 | 2935 | 2918 | 2918 | 2824 and 2918 |
3430 | 3400 | 3432 | 3432 | 3430 |
NOMENCLATURE:
NOTE:
Reference: Rashid, I., Omari, M. H. A., Leharne, S. A., Chowdhry, B. Z., & Badwan, A. (2012). Starch gelatinization using sodium silicate: FTIR, DSC, XRPD, and NMR studies. Starch - Stärke, 64(9), 713–728. Portico. DOI: https://doi.org/10.1002/star.201100190
Table 4: FTIR Spectra of Pullulan: Characteristic Absorption Bands and Functional Group Assignments
Wavenumber (cm⁻¹) | Vibration Mode | Functional Group/Assignment |
---|---|---|
3400–3200 | O–H stretching | Hydroxyl groups (OH) |
2920–2850 | C–H stretching | Aliphatic C–H bonds |
1640–1630 | O–H bending (adsorbed water) | Water absorbed in the sample |
1450–1400 | C–H bending | CH₂ and CH₃ groups |
1370–1350 | C–H bending | CH₃ groups |
1150–1100 | C–O–C stretching | Glycosidic linkage (C–O–C) |
1070–1030 | C–O stretching | C–O bonds in the sugar ring |
1040, 1020, 996 | Glycosidic linkage vibrations | Specific to pullulan structure |
930–910 | C–O–C stretching | Glycosidic linkage (C–O–C) |
850–840 | C–H bending | Anomeric C–H deformation |
NOMENCLATURE:
NOTE:
Reference:
1. Shingel, K. I. (2002). Determination of structural peculiarities of dexran, pullulan and γ-irradiated pullulan by
Fourier-transform IR spectroscopy. Carbohydrate Research, 337(16), 1445–1451.
DOI:
https://doi.org/10.1016/s0008-6215(02)00209-4
2. Firsov, S. P., Zhbankov, R. G., Petrov, P. T., Shingel, K. I., & Tsarenkov, V. M. (1999). Analysis of dextran and pullulan molecular fraction structure
by the method of IR-spectroscopy. Spectroscopy of Biological Molecules: New Directions, 323–324.
DOI:
hhttps://doi.org/10.1007/978-94-011-4479-7_144
Table 5: Characteristic IR Bands of Cellulose, sodium carboxymethylcellulose (CMC), carboxymethylcellulose acetate(CMCA), and carboxymethylcellulose acetate butyrate (CMCAB)
Material | Wavenumber (cm⁻¹) | Assignment | Relative Absorbance |
---|---|---|---|
Cellulose | 3482.81 | Strong hydrogen-bonded O-H stretching vibration | 3.59 |
2897.52 | C-H stretching | 1.74 | |
1645.95 | O-H bending from absorbed water | ||
1428.99 | CH₂ bending of pyranose ring | 2.12 | |
1370.18 | C-H bending | 2.56 | |
1034.62 | C-O-C pyranose ring vibration | 2.42 | |
898.66 | β-glycosidic linkage between glucose units in cellulose | 1.08 | |
CMC | 3445.21 | O-H stretching | 1.31 |
2901.38 | Stretching vibration of methine (C-H) | 3.37 | |
1599.66 | C=O group | ||
1414.53 | Anti-symmetric and symmetric stretching vibration peak of COO | 0.99 | |
1369.21 | C-H bending | 0.99 | |
1060.66 | C-O-C stretching | 1.21 | |
CMCA | 3447.13 | Unsubstituted O-H group | 0.68 |
2911.02 | COOH of acetyl group and methyl –CH₃ of CMCA | 1.36 | |
1743.33, 1639.2 | Asymmetric and symmetric C=O coupled stretching | 1.98, 1 | |
1379.82, 1434.38 | Symmetric and asymmetric vibrations of CH₃ | 1.79, 1.65 | |
1434.38 | CH₂ band | 1.65 | |
1245.79, 1037.52, 904.45 | Asymmetric stretching vibrations of C-O-C in ester | 2.03, 2.52, 1.02 | |
CMCAB | 3531.99 | Unsubstituted O-H group | 1.1 |
2966.95 | COOH dimer group and methyl –CH₃ of CMCAB | 0.43 | |
2884.99 | Methylene –CH₂ of CMCAB | 0.03 | |
1748.16, 1640.16 | Asymmetric and symmetric C=O coupled stretching | 2.23, 1 | |
1375 | C-CH₃ of acetyl | 1.22 | |
1240.97, 1168.65, 1064.51 | Asymmetric vibrations of C-O-C to prove the existence of an ester | 1.66, 1.96, 2.36 |
NOMENCLATURE:
CMC: Sodium carboxymethylcellulose
CMCA: Carboxymethylcellulose acetate
CMCAB: Carboxymethylcellulose acetate butyrate
NOTE:
Reference:
El-Sakhawy, M.A., Kamel, S., Salama, A., & Tohamy, H.S. (2018). PREPARATION AND INFRARED STUDY OF CELLULOSE BASED AMPHIPHILIC MATERIALS. DOI:
http://www.cellulosechemtechnol.ro/pdf/CCT3-4(2018)/p.193-200.pdf