Table 3 FT-IR spectra peak values: (A) petroleum ether extract of A. occidentale, (B) ethylacetate extract of A. occidentale, (C) n-hexane extract of P. guajava, (D) petroleum ether extract of T. catappa, (E) ethylacetate extract of T. catappa

1.

2955.8

67.950

Alkanes sp3 C-H stretch

C-H

2.

2926.0

62.776

Alkanes sp3 C-H stretch

C-H

3.

2855.1

78.007

Aldehyde C-H stretch

C-H

4.

1748.1

98.517

Ester carbonyl C-O stretch

C=O

5.

1606.5

99.085

Conjugated alkenes C-C

C=C

6.

1453.7

82.438

Aromatic compounds C-C stretch

C=C

7.

1379.4

91.002

Acyl C-O; phenol C-O stretch

C=O; C-O

8.

1237.5

97.513

Aromatic ethers, aryl-O stretch

9.

1036.2

97.765

Alkoxy C-O stretch

X-O-C

10.

905.7

97.513

Mono-substituted alkene sp2 C-H bend

=C-H

11.

767.8

97.464

Di-substituted aromatic sp2 C-H bend

=C-H

12.

726.8

87.966

Mono-substituted aromatic sp2 C-H bend

=C-H

13.

693.3

94.726

Di-substituted aromatic sp2 C-H bend

=C-H

1.

3444.1

87.566

Dimeric O-H stretch

O-H

2.

2989.1

87.083

Alkanes sp3 C-H stretch

C-H

3.

2907.3

95.394

Alkanes sp3 C-H stretch

C-H

4.

2091.0

98.362

Isothiocyanate (-SCN) stretch

-SCN

5.

1889.8

98.918

Carboxylic acids C-O stretch

C=O

6.

1736.9

45.205

Ester C-O stretch

C=O

7.

1654.9

88.777

Amides C-O stretch

C=O

8.

1446.2

86.722

Aromatic C-C stretch

C=C

9.

1376.9

45.205

Acyl C-O; phenol C-O stretch

C=O; C-O

10.

1237.5

26.947

Skeletal C-C vibration

C-C

11.

1092.1

80.365

Alkoxy C-O stretch

X-O-C

12.

1043.7

32.142

Primary amine C-N stretch

C-N

13.

939.3

87.721

Alkenes sp2 C-H bend

=C-H

14.

878.7

87.409

Alkenes sp2 C-H bend

=C-H

15.

849.8

83.588

Tri-substituted alkenes sp2 C-H bend

C-H

16.

786.5

85.048

Di-substituted aromatic sp C-H bend

C-H

17.

733.0

83.080

Mono-substituted aromatic C-H bend

C-H

1.

2952.8

83.080

Alkanes sp3 C-H stretch

C-H

2.

2926.0

60.632

Alkanes sp3 C-H stretch

C-H

3.

2858.9

89.315

Alkanes sp3 C-H stretch

C-H

4.

2728.4

99.307

Aldehyde C-H stretch

C-H

5.

1990.4

99.392

Cyanate C-N stretch

-C≡N

6.

1748.1

99.203

Esters C-O stretch

C=O

7.

1610.2

98.594

Conjugated alkenes C-C stretch

C=C

8.

1457.4

91.799

Aromatic ring stretch

C=C-C

9.

1379.1

96.026

Alkanes sp3 C-H bend

C-H

10.

1155.5

98.738

Tertiary amine C-N stretch

C-N

11.

1032.5

98.385

Primary amine C-N stretch

C-N

12.

909.5

98.686

Vinyl C-H bend

C-H

13.

805.1

98.057

Di-substituted aromatic C-H bend

C-H

14.

767.8

97.557

Di-substituted aromatic C-H bend

C-H

15.

730.6

95.929

Cis-alkene sp2 C-H bend

C-H

16.

697.0

96.671

Cis-alkene sp2 C-H bend

C-H

1.

3734.8

98.151

Amide and alcohol N-H and O-H stretch

N-H; O-H

2.

3112.3

100.06

Alkynes sp C-H stretch

≡C-H

3.

2922.2

87.464

Alkanes sp3 C-H bend

C-H

4.

2851.4

92.180

Alkanes sp3 C-H bend

C-H

5.

2079.9

99.779

Isothiocyanate (-NCS) stretch

N≡C-S

6.

2020.2

99.134

Isothiocyanate (-NCS) stretch

N≡C-S

7.

1733.2

96.365

Aldehyde C-O stretch

C=O

8.

1464.8

97.090

Aromatics compounds sp2 C-C stretch

C=C

9.

1121.9

96.124

Alkyl substituted alkoxy C-O stretch

C-O-C

10.

1039.9

98.420

Alkoxy C-O stretch

X-O-C

11.

920.7

99.150

Alkenes sp2 C-H bend

C-H

12.

887.1

99.118

Di-substituted aromatics sp2 C-H stretch

C-H

13.

849.8

99.111

Di-substituted aromatics sp2 C-H stretch

C-H

14.

801.4

98.870

Di-substituted aromatics sp2 C-H stretch

C-H

1.

3410.5

77.486

Alcohols O-H stretch

O-H

2.

2981.9

85.453

Alkanes sp3 C-H stretch

C-H

3.

2907.3

93.016

Alkanes sp3 C-H stretch

C-H

4.

1725.8

56.071

Aldehyde C-O stretch

C=O

5.

1446.2

86.294

Aromatic compounds C-C stretch

C=C

6.

1375.4

62.498

Nitro compounds NO₂ stretch

-N=O

7.

1241.2

40.429

Acyl C-O; phenol C-O stretch

C-O

8.

1088.4

77.450

Alkoxy C-O stretch

X-O-C

9.

1043.7

35.790

Alkoxy C-O stretch

X-O-C

10.

939.3

88.215

Mono-alkene sp2 C-H bend

C-H

11.

879.7

79.321

Alkene sp2 C-H bend

C-H

12.

849.8

81.398

Alkene sp2 C-H bend

C-H