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The chemical composition of the leaves’ oil of Artabotrys vinhensis Ast. (family: Annonaceae) from Vietnam

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A hydrodistilled oil obtained from leaves of Artabotrys vinhensis Ast growing wild in Vietnam belonging to the family Annonaceae, was analyzed by Capillary GC and GC/MS. The oil was found to contain about sixty components of which more than 50 constituents, comprising 96.98%, were identified. The major compounds of the essential oil were α-pinene (16.67%), limonene (15.40%), germacrene D (14.41%), benzylbenzoate (8.80%), β-pinene (7.48%), β-caryophyllene (7.47%) and germacrene B (5.02%).

Keywords: Artabotrys vinhensis Ast, Annonaceae, essential oil composition, neral, geranial, -caryophyllene.

Introduction

The genus Artabotrys of the family Annonaceae is a paleotropical genus compose of one hundred species of climbers and scandent shrubs distribute mainly in the tropical zone and the subtropical areas, especially Africa and Asia [1], of which only the widespread Asia. Some Asian species of the Annonaceae are economically important as sources of the edible fruit and aromatic oils. Little is known about the potential uses or chemistry of the species of Artabotrys [2, 3, 5, 7].

The flowers of A. hexapetalus (L.f.) Bhand. from the Indian subcontinent are used to make a stimulant tea [4] and are also apparently useful in the treatment of choler [6]. Four Artabotrys species from China has long been used among the ordinary people as medicinal plant which  have antipyretro, antidotal, antiphlogistic and analgesic effects and are often used for malaria [3].

Analysis of the essential oils of A. adoratissimus fruits and leaves from South India have found move than 80 compounds, in which sesquiterpenes as a-caryophyllene (14.7% - 17.3%), a-copanene (6.4-9.3%), (E)-nerolidol, d-cadinene (4.2% - 7.3%), caryophyllene oxide (3.2% - 16.8%), (E,E)-a-farnesene (5.8-7.4%) and t-cadinol (2.9% - 3.29%) are main components, some monoterpenes and hexane derivatives were found also [8]. The steam-distilled oil from the bark of Artabotrys lastourvillensis from Gabon. All seventeen components identified were sesquiterpenoids of which cyperene (25.9%) and cyperenone (11.1%) [9]. The essential oils extracted from five Artabotrys species, Annonaceae (A. insignis, A pierreanus, A. rufus, A. thomsoni and A. venustus) [10]. The main components of each oil have been identified. Among them, two compounds seem to have a chemotaxonomic significance: cyperenone and 1,5-epoxysalvial-4(14)-ene. Pleasant flower smelling essential oil of Artabotrys hexapetalus from Vietnam, twenty-six components of the oil including sesquiterpene hydrocarbons (33.3% of the oil) and oxygenated sesquiterpenoids (47.7%) were identified β-caryophyllene (11.4%) and caryophyllene oxide (31.5%) were identified as the major components of the oil [13]. The primary study of the chemical composition of the Artabotrys hexapetalus flower in Ninh Binh province. The main compounds in this essential oil were caryophyllene oxide (36.19%); β-caryophyllene (7.87%); α-copaene (10.78%); β-asarone (6.12%) [11]. Up to date only 15 Artabotrys species have been recoded in Vietnam. To the best of our knowledge  the leaf oil of Artabotrys vinhensis Ast has never been previously analyzed  has 4 species edemic in Vietnam [12].

Experimental

1. Source- Artabotrys vinhensis Ast (Annonaceae), is a clember to 7 – 10 m long, growing in Vietnam. The leaves of Artabotrys vinhensis Ast were collected in April 2007, in Quynh Luu district, Nghe An province and identified by Assoc. Prof. Dr. Vu Xuan Phuong of Institute of Ecology and Biological Resources. A voucher specimen (DD110) was deposited at the Herbarium of the Institute of Ecology and Biological Resources, Vietnamese Academy of Science and Technology and  Vinh University.

Fresh leaves were shredded and their oil were obtained by steam distillation for 3 h at normal pressure, according to the Vietnamese Pharmacopoeia [14]. The yield of the fresh leaf oil was 0.1%. 

2. GC- About 15mg of oil, which was dried with anhydrous sodium sulfate, was dissolved in 1ml of n-hexane (for spectroscopy or chromatography).
GC analysis was performed on an Agilent Technologies HP 6890 Plus Gas chromatograph equipped with a FID and fitted with HP-5MS column (L = 30 m, ID = 0.25 mm, film thickness = 0.25 mm). The analytical conditions were: carrier gas H2, injector temperature (PTV) 250oC, detector temperature 260oC, temperature programmed 60o (2 min hold) to 220o (10 min hold) at 4oC/min.

3. GC/MS- An Agilent Technologies HP 6890 N Plus Chromatograph was fitted with a fused silica capillary col. HP-5MS column (L = 30 m, ID = 0.25 mm, film thickness = 0.25 mm). The condition of use were the same as described above with He as carrier gas, and interface with a mass spectrometer HP 5973 MSD (70 eV). The temperature was programmed as reported above. Component identification was carried out by comparing MS data with those reported in Library Willey on Chemstation HP, and in some cases substances identified from oils known composition and also with standard substances [15 - 20].

Results and discussion

The  oil yield  of fresh leaf was 0.1% after 3 h of distillation. The average oil composition in Table 1., in which the identified compounds are given, representing about 96,98% of the oil. The main components were α-pinene (16.67%), myrcene (15.40%), germacrene D (14.41%), benzyl benzoate (8.81%), β-pinene (7.48%), β-caryophyllene (7.47%) and germacrene B (5.02%).

Table 1:  Chemical composition of the essential oil of  Artabotrys vinhensis  from Vietnam

No

Compounds

KI

% FID

1.       

α-pinene

939

16.67

2.        

camphene

953

0.07

3.        

sabinene

976

0.55

4.        

β-pinene

980

7.64

5.        

β-myrcene

990

2.41

6.       

limonene

1032

15.40

7.        

(Z)-β-ocimene

1042

0.05

8.        

(E)-β-ocimene

1053

0.59

9.        

g-terpinene

1061

0.05

10.     

α-terpinolene

1090

0.06

11.     

linalool

1100

0.66

12.     

nonanal

1102

0.06

13.     

geijerene

1143

0.06

14.     

isomenthone

1167

0.10

15.     

l-menthone

1171

0.42

16.     

p-anisyl alcohol

1281

0.31

17.     

bicycloelemene

1327

0.28

18.     

α-cubebene

1351

0.27

19.     

α-ylangene

1375

0.03

20.     

α-copaene

1376

1.24

21.     

β-bourbonene

1388

0.34

22.     

β-cubebene

1388

0.22

23.     

β-elemene

1391

1.47

24.     

trans-α-bergamotene

1413

0.14

25.     

β-caryophyllene

1419

7.47

26.     

α-bergamotene

1435

0.73

27.     

α-humulene

1454

2.66

28.     

germacrene D

1485

14.47

29.     

α-amorphene

1485

1.13

No

Compounds

KI

% FID

30.     

(+)-epi-bicyclosesquiphellandrene

1489

0.44

31.     

β-selinene

1490

0.09

32.     

cadina-1,4-diene

1496

0.13

33.     

α-muurolene

1500

0.04

34.     

cis-z-α-bisabolene epoxide

1515

0.37

35.     

endo-1-bourbonanol

1520

0.25

36.     

d-cadinene

1525

2.18

37.     

nerolidol

1563

0.08

38.     

germacrene B

1576

5.02

39.     

spathulenol

1578

0.15

40.     

caryophyllene oxide

1583

0.68

41.     

salvial-(14)-en-1none

1595

1.03

42.     

guaiol

1601

0.29

43.     

(Z)-β-asarone

1617

0.17

44.     

t-muurolol

1645

0.64

45.     

α-cadinol

1654

1.06

46.     

benzyl benzoate

1760

8.81

Acknowledgements

The Authors wish to thank Assoc. Prof. Dr. Vu Xuan Phuong, Institute of Ecology and Biological Resources, Vietnamese Academy of Science and Technology, for confirmation of the plant identity.

References

1. P. J. A. Kessler – Annonaceae, In The Families and Genera of Vascular Plants. Edits., K. Kubitzki, J.G. Rohwerand V. Bittrich, Springer-Verlag, Berlin/Heidelberg, 1993.
2. G. Sankowsky - New food plants for some Queensland butterflies, Aust. Ent. Mag.18 (1991) 9-19.
3. L. M. Perry - Medicinal Plants of East and Southeast Asia: Attributed Properties and Uses. MIT Press, Cambridge (Massachusetts)/ London, 1999.
4. O. Ekundayo - A review of the volatiles of the Annonaceae, J. Essent. Oil Res. 1 (1989) 223-245.
5. S. C. Garg and N. Siddiqui - Chemical composition of the essential oil of Artabotrys adoratissimus, Indian. J. Chem., Sect. B: Org. Chem. Include. Med. Chem. 38B (1999) 1229-1230.
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9. Menut C., Bessiere  J. M., Mve-Mba C. E., Affane-Nguema J. P. - Aromatic plants of tropical central Africa. VI, The essential oil of Artabotrys lastourvillensis Pell. from Gabon, J. Essent. Oil Res. 4 (3) (1992) 305-307.
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11. Do Dinh Rang, Ha Thi Huong - The primary study of the chemical composition of the Artabotrys hexapetalus flower in Ninh Binh province, Journal of Science of Hanoi University 4 (2004) 70-73.
12. Nguyen Tien Ban - Flora of Viet Nam, Family Annonaceae Vol. 1, Science and Technics and  Publishing House, Hanoi, 2000.
13. Phan Minh Giang, Phan Tong Son - Wilfried A. König, Chemical composition of the flower essential oil of Artabotrys hexapetalus (L. f.) Bhandare of Vietnam, J. Essent. Oil Res. 19 (2007) 523-524.
14. Vietnamese Pharmacopoeia, Medical Publishing House, Hanoi, Vietnam, 1997.
15. Heller S. R. and Milne G. W. A. - EPA/NIH Mass Spectral Data Base, U.S. Government Printing Office, Washington D. C. (1978, 1980, 1983).
16. E. Stenhagen, S. Abrahamsson and F. W. McLafferty - Registry of Mass Spectral Data, Wiley, New York, 1984.
17. A. Swigar and R. M. Siverstein - Monoterpenens, Aldrich, Milwauke, 1981.
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19. D. Joulain and W. A. Koenig - The Atlas of Spectral Data of Sesquiterpene Hydrocarbons. E. B. Verlag, Hamburg, 1998.
20. N. A. Dung, T. D. Thang, H. V. Luu and N. X. Dung - Volatile Constituents of the Leaf Oil of Alchornea tiliifolia (Benth.) Muell. (Family Euphorbiaceae) from Vietnam, J. of Essent. Oil Res. 21 (2009) 3-4.

Do Ngoc Dai, Tran Minh Hoi
Institute of Ecology and Biological Resources, Viet Nam Academy of Science and Technology, Ha Noi.
Tran Dinh Thang
Faculty of Chemistry, Vinh University, 182- Le Duan, Vinh, Vietnam
Nguyen Xuan Dung
Faculty of Chemistry, College of Natural Science, Hanoi National University, 19-Le Thanh Tong, Hanoi, Vietnam
(Science and Technology Journal, No (48): 2A/2010)

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