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. 2024 Jan 13;10(2):e24504. doi: 10.1016/j.heliyon.2024.e24504

Table 5.

FTIR peak locations and assignment of sequential acid-alkali extraction of DSFFG, RSFFG, DSWFG, and RSWFG.

Region
 Peak wave numbers (cm-1)
 Assignment
 Reference
DSFFG RSFFG DSWFG RSWFG
Amide A1) 3289.98 3284.53 3299.05 3249.90 N–H stretch coupled with H-bond Muyonga et al., 2004
Amide B2) – 2969.28 2928.68 – CH antisymmetric and symmetric stretching Abe and Krimm, 1972
Amide I2) 1629.37 – 1629.77 1650.83 C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretch/hydrogen bond coupled with COO- Abe and Krimm, 1972
Amide II 1543.87 1543.92 1546.12 1548.66 NH bend coupled with CN stretch Payne and Veis, 1988
Amide III 1232.62 1231.34 1232.62 1238.41 NH bend stretch coupled with CN stretch Shurvell, 2002
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Esters		 1079.26
1710		 1079.26
1737		 1081.51
1725		 1081.34
–		 C–O skeletal stretch
C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretch with OCOR		 Jackson et al., 1995
Wu et a., 2019