Table 1 Identified volatile components in Syzygium malaccense leaves obtained by hydrodistillation (HD), head space (HS), and supercritical fluid (SF) methods

1

4.92

2-Hexenal

C₆H₁₀O

828

832

nd

1.14

nd

2

6.51

Butyl glycol

C₆H₁₄O₂

886

903

0.21

nd

nd

3

7.50

α-Thujene

C₁₀H₁₆

922

921

1.30

13.79

nd

4

7.67

α-Pinene

C₁₀H₁₆

928

929

4.91

10.38

nd

5

8.02

Camphene

C₁₀H₁₆

941

941

nd

0.02

nd

6

8.84

β-Pinene

C₁₀H₁₆

971

973

nd

19.75

nd

7

9.24

Octanal

C₈H₁₆O

985

1000

nd

0.02

nd

8

9.66

α-Phellandrene

C₁₀H₁₆

1000

1002

nd

3.20

nd

9

10.05

α-Terpinene

C₁₀H₁₆

1013

1015

2.24

8.24

nd

10

10.14

p-Cymene

C₁₀H₁₄

1016

1016

16.02

7.07

nd

11

10.43

Limonene

C₁₀H₁₆

1025

1025

0.18

0.93

nd

12

11.37

γ-Terpinene

C₁₀H₁₆

1055

1059

12.20

33.06

nd

13

14.73

Terpinen-4-ol

C₁₀H₁₈O

1164

1168

3.90

0.75

nd

14

15.06

α-Terpineol

C₁₀H₁₈O

1174

1179

nd

0.15

nd

15

17.27

Methyl citronellate

C₁₁H₂₀O₂

1249

1250

nd

0.03

nd

16

18.21

Thymol

C₁₀H₁₄O

1282

1288

0.18

nd

nd

17

22.00

Caryophyllene

C₁₅H₂₄

1416

1416

1.24

0.10

2.74

18

22.85

Humulene

C₁₅H₂₄

1440

1445

nd

nd

0.57

19

24.56

Cubenene

C₁₅H₂₄

1505

1522

nd

nd

2.02

20

25.79

Caryophyllene oxide

C₁₅H₂₄O

1564

1565

18.48

nd

nd

21

25.90

Globulol

C₁₅H₂₆O

1568

1568

2.64

nd

nd

22

26.07

Viridiflorol

C₁₅H₂₆O

1575

1580

0.47

nd

nd

23

27.17

tau-Cadinol

C₁₅H₂₆O

1620

1625

11.99

nd

nd

24

27.52

α-Cadinol

C₁₅H₂₆O

1632

1632

9.52

nd

0.46

25

49.03

Squalene

C₃₀H₅₀

2796

2814

nd

nd

60.6

Total identified compounds

85.48

98.93

66.39

Non-oxygenated compounds

38.09

96.45

65.93

 Monoterpenes

36.85

96.44

-

 Sesquiterpenes

1.24

0.10

5.33

 Triterpenes

-

-

60.60

Oxygenated compounds

47.39

2.09

0.46

 Monoterpenes

4.08

0.90

-

 Sesquiterpenes

43.10

-

0.46

 Others

0.21

1.16

-