Frequency range (measured in this test) a Frequency range (literature)b
Assignment c
Origin d
Comment
1739.7 (P) 1745-1740 C=O stretching vibration of alkyl ester Pectin CWM and CDTA
1610.5 (P)
1630-1600
COO-antisymmetric stretching
Polygalacturonic acid, carboxylate (pectin ester group)
Mainly CWM and CDTA residue
1361.7、1369.4、1361.7、1371.3 (XG, C)
1370
CH2 bending
Xyloglucan, Cellulose
KOH residue All residue
1029.9 (C) KOH residue
1313.5、1317.3 (C) 1317 CH2 symmetric bending Cellulose KOH residue
1230.5、1240.2、1265.3、1267.2 (P) 1243 C–O stretching Pectin CWM and CDTA residue
1139.9 (XG) 1130 O–C–O asymmetric stretching Xyloglucan (glycosidic link) None
1035.7、1037.7 (XG) 1042 C–O stretching, C–C stretching Xyloglucan (ring) None
1029.9 (C) 1030 C–O stretching, C–C stretching Cellulose (C6-H2-O6)
1010.7、1014.5 (P) 1019 C–O stretching, C–C stretching Pectin (C2-C3, C2-O2, C1-O1) CWM and CDTA residue
997.2、1008.7 1010.7 (C)
1000
C–O stretching, C–C stretching
Cellulose (C6-H2-O6)
Na2CO3 residue (potato)