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Table 2 FT-IR spectral assignment and functional groups of R, Rh, and L crude alcoholic extract

From: A comparative study of the bioavailability of Red Sea seagrass, Enhalus acoroides (L.f.) Royle (leaves, roots, and rhizomes) as anticancer and antioxidant with preliminary phytochemical characterization using HPLC, FT-IR, and UPLC-ESI-TOF-MS spectroscopic analysis

R

Rh

L

 

Functional group

References

490–620

C–Br, C–I

Halogen compounds

[29]

–

610–690

C–H wagging vibration

w, Vinyl hydrocarbon compounds

[30]

700–782

–

Deformation out-of-plane vibration of the OH groups

w, Benzene derivative

[29]

–

820.76

–

C–C skeletal vibration

w, Alkane

[30]

866.21

–

–

R-NH2

W, primary amine

[26]

–

881.50

–

C–C skeletal vibration

W, Alkane

 

925.50

–

–

OH bending

W,s, carboxylic acid

[31]

994.83

–

–

C=C bending

m,s, Alkene

 

–

1044.82

1049.49

C–O–C symmetric stretch

St.br, aromatic ethers

[29]

1052.50

–

–

CH2 and CH–O–H

m,s Aromatic alcohols

[26]

–

1104.33

–

C–O–C stretching vibration of the

s, Ether group cellulose and hemicellulose

[29]

–

–

1195.18

C–N stretch

w, amine

 

1201.72

–

–

 

Phenol hydroxyl

[32]

–

1260.69

–

Ar–O

Alky and aryl ester

[26]

–

–

1301.42

C–N stretch

w, aromatic amine

[33]

1414.49

1409.98

1410.51

C–H in-plane bending coupled with C–C stretching in ring

m, s—Secondary alcohol-free

[30, 34]

–

1437.66

–

–C–H deformation vibration

m, R-CH3; Alkane

[30]

–

1528.85

–

N–H deformation vibrations

W, Secondary amine

[30]

–

1606.56

1599.37

C=C conjugated with C=O

S, cyclic alkene, unsaturated ketone

[30]

1631.6

–

–

N–H

M, primary amide

[26]

–

–

2854.06

symmetric stretching vibrations of CH2

m, lipid

[28, 35]

–

2922.92

2924.52

Asymmetric stretching vibrations of CH2

st,s, lipid or alkanes

[28, 30, 35]

–

3248.16

–

N–H stretching

vibration

st, br.,proteins and terpenoids

[36]

3334.53

–

3279.25

bonded (–OH) hydroxyl stretching

st, br., Phenol

[36]

  1. *m = medium, st = strong, br. = broad, w = weak, s = sharp