Table 4. Functional groups present in various fraction of jellyfish bell and oral arms as detected by FTIR

Type of vibration	Frequency range (cm–1)	Intensity	Jellyfish bell					Jellyfish oral arm
			PE	DCM	DCM	MeOH	H2O	PE	DCM	DCM	MeOH	H2O
N-H stretch	3,500–3,100	-	-	-	-	-	3,904.4/ 3,457.45	3,418.88	-	-	-	-
O-H bond; H-bonded	3,400–3,200	M	3,308.21	3,289.92	3,293.77	3,317.05	3,304.18	-	3,302.68	3,293.02	3,313.68	3,277.43
C-H alkanes (stretch)	3,000–2,850	S	2,923.2	2,920.62	2,919.32	-	2,918.6	2,923.47	2,920.14	2,920.77	2,929.85	-
C-H alkyne (stretch)	2,900–2,800	-	2,858.83	2,856.59	2,854.95	-	2,857.27	2,860.04	2,856.43	2,858.09	-	-
C=O aldehyde	1,740–1,720	S	1,740.14	-	1,739.31	-	1,738.44	1,728.54	-	-	-	-
C=O ketose	1,680–1,630	S	1,647.99	1,646.12	1,646.56	1,631.67	1,647.21	-	1,646.68	1,646.79	1,637.59	1,636.07
N-H bend	1,640–1,550	M-S	-	1,550.1	1,552.21	-	1,512.64	-	1,546.64	1,546.64		1,547.43
CH3 bend	1,450–1,375	M	1,447.25	1,452.98	1,452.67	1,435.16	1,484.02	1,453.96/1,373.53	1,450.77	1,452.25	1,428.75	1,422.45
C-O alcohols, ethers, COOH	1,300–1,000	S	1,315.01	1,240.38	-	-	-	1,166.45	1,314.57	-	1,239.5	-
S=O sulfones, sulfonyl chlorides	1,350–1,140	S	1,112.33	1,148.74	-	-	1,183.68	-	-	-	1,103.1	1,110.89
C-N amines	1,350–1,000	M-S	1,026.11	-	1,083.71	1,098.97	1,026.9	1,057.38	1,111.28	1,090.59	1,016.06	-
C-H aromatics (out of plane bend)	900–690	S	866.18	834.11	966.5	-	949.19/ 853.71/ 723.09	722.82	-	-	-	-
C-X chlorine, bromine	785–540	S	555.03/430.13	556.98	-	-	583.14	466.35	433.21	597.34		-
Functional group present			-CH3-COOHgroup	-COOH-C=O-OH-S=Ogroup	-CH3-COOHgroup	-COOH,-C=O-CH3-N-H-OHgroup	-C=O-N-H-OHgroup	-OH-NH2-S=Ogroup	-COOH,-C=O-CH3-N-H-OHgroup	-C=O-N-H-OHgroup	-COOH-C=O-OH-S=Ogroup	-OH-NH2-S=Ogroup
Macromolecules present			Lipids	Sugars, amino acids, aglycones	Lipids	Lipids, alkaloids*S=O group present	Alkaloids and aglycone	Proteins	Lipids, alkaloids	Alkaloids and aglycone	Sugars, amino acids, aglycones	Proteins

FTIR, Fourier transform infrared; M, medium; S, strong.