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)
|