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Research Article
 

Volatile Oil Yield and Constituents of Salvia officinalis, S. tomentosa Mill. and S. glutinosa Growing in Ankara, Turkey



Kiarash Afshar Pour Rezaeieh and Bilal Gurbuz
 
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ABSTRACT

Background and Objective: The genus Salvia L. is represented in Turkey by 88 species and 45 endemics some of which bear great economic value. Current study aimed at identifying promising Salvia species, especially less-common ones, regarding their essential oil yields and constituents in Ankara ecological conditions. Materials and Methods: Aerial parts of three Salvia spp. growing in Ankara University Experimental Field were set to GC/MS analysis after being dried in shade. Results: The essential oil contents of Salvia officinalis, S. tomentosa and S. glutinosa were 1.67% (v/w), 1.56% (v/w) and 0.12% (v/w), respectively. The main chemical groups for S. officinalis, S. tomentosa and S. glutinosa were oxygenated monoterpenes (49.59%), sesquiterpene hydrocarbons (59.28%) and monoterpene hydrocarbons (69.23%), respectively. Conclusion: The S. glutinosa was characterized by considerable amount of diterpene (5.87%) β-thujone (31.90%), β-pinene (53.36%) and β-caryophyllene (19.34%) were determined as the most abundant components for Salvia officinalis, S. tomentosa and S. glutinosa, respectively. The results of the analyses of the oils from Salvia species revealed that oil with low yield was rich with some components including β-caryophyllene.

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Kiarash Afshar Pour Rezaeieh and Bilal Gurbuz, 2017. Volatile Oil Yield and Constituents of Salvia officinalis, S. tomentosa Mill. and S. glutinosa Growing in Ankara, Turkey. Asian Journal of Agricultural Research, 11: 43-47.

DOI: 10.3923/ajar.2017.43.47

URL: https://scialert.net/abstract/?doi=ajar.2017.43.47
 
Received: November 30, 2016; Accepted: January 12, 2017; Published: February 15, 2017



INTRODUCTION

Salvia, the large and polymorphous genus of the family Lamiaceae, comprises about 900 species with almost cosmopolitan dissemination1. Turkey flora includes a major diversity center for Salvia in Asia2, among them are Salvia officinalis, S. tomentosa and S. glutinosa.

Parallel to their everyday growing medicinal use, natural essential oils have great commercial value. Oil chemical composition of S. officinalis, one of the most appreciate herbs for its rich essential oil and its plethora of biologically active compounds extensively used in folk medicine3, has been the subject of many publications4-6. Salvia tomentosa with wound healing effect similar to that of iodine tincture7 contains considerable amounts of secondary metabolites such as phenolics and terpenoids7,8. Salvia glutinosa L. growing in the woods from Central Russia to Southern Italy9, hasn't previously been examined for its chemical compositions under Ankara ecological circumstances.

Volatile profiles of some Salvia species have been studied in Ankara ecological conditions. For instance, Ipek et al.10,11 comparatively studied the essential oil composition of wild and cultivated S. forskaohlei and S. cryptantha Montbert & Aucher ex. However, there has been no study on S. glutinosa essential oil constituents in Ankara ecological conditions. The aim of the present study was to investigate the chemical profile of S. glutinosa as well as to compare the constituents with the two other species; S. officinalis and S. tomentosa.

MATERIALS AND METHODS

Plant material: Whole plant specimens from localities of Ankara were grown in trial fields of Ankara University the year before analyses.

Essential oil extraction: Dried aerial parts of samples were subjected to hydro-distillation for 3 h, using a clevenger-type apparatus and then kept at 4°C until they were analyzed.

Gas chromatography: The essential oil was broken down by GC/MS. The analysis was done using a Hewlett Packard 6890 N GC, equipped with HP-5 MS capillary column (30 m×0.25 μm) and HP 5973 mass selective detector. For GC-MS detection an electron ionization system with ionization energy of 70 eV was used. Helium was carrier gas, at a flow rate of 1 mL min–1. Injector and MS transfer line temperatures were set at 220 and 290°C, respectively. Column temperature was initially kept at 50°C for 30 min, then imperceptibly increased to 150°C at a 3°C min–1 rate, held for 10 min and finally raised to 250°C min–1. Diluted samples (1/100 in acetone, v/v) of 1.0 μL were injected automatically and in the splitless mode. The identities of the components of the oil were established from their GC retention indices, relative to C7-C25 n-alkanes, by comparison of their MS spectra with those reported in the literature data and by computer matching with the Wiley 5 mass spectra library, whenever possible, co-injection with a standard available in the laboratories.

RESULTS AND DISCUSSION

The essential oil content in dry leaves was 1.67% (v/w) for S. officinalis, 1.56% (v/w) for S. tomentosa and 0.12% (v/w) for S. glutinosa. The composition of the essential oils of the studied Salvia species is presented in Table 1 in order of their retention indices.

Seventeen components were identified for S. officinalis, representing 93.57% of the total oil. The oil was dominated by monoterpenes of which monoterpenes hydrocarbons such as β-pinene (13.08%) as well as oxygenated monoterpenes like β-thujone (31.90%) and α-humulene (10.17%) were detected in high quantities. Besides, oxygenated sesquiterpene viridiflorol was found in a considerable amount (10.74%).

Reports on the chemical compositions of the oils isolated from S. officinalis are abundant. In the chemical compositions of these oils elucidated by GC/MS analysis from Iran, 1,8-cineole, α and β-pinene, α and β-thujone and camphor are abundant6. The constituents’ patterns of the reports are in agreement with data given in this study. However, there are some significant differences either in components or proportions of the oils: Members of oxygenated monoterpenes fraction namely 1,8-cineole (39.5-50.3%) and camphor (8.8-25.0%) were screened in specimens from Jordan12. Again, essential oils of polish samples exhibited remarkable amounts of oxygenated monoterpenes (α-thujone, 1,8-cineole, camphor, β-thujone) together with monoterpene hydrocarbons (α-pinene and β-pinene)13. But there are few references reporting α-humulene and viridiflorol with substantial peaks only occurred in the last decade5,14. In this regard, occurrence of these components, especially oxygenated sesquiterpene of viridiflorol, in Turkey is unique.

Eighteen components were characterized in the oil of S. tomentosa, constituting 85.10% of the total oil. The oil was characterized by a high content of β-pinene (53.36%), followed by α-pinene (9.12%), β-caryophyllene (4.37%), α-humulene (2.41%) and β-phellandrene (2.13%).

Table 1: Essential oil components of Salvia officinalis, S. tomentosa and S. glutinosa
Image for - Volatile Oil Yield and Constituents of  Salvia officinalis, S. tomentosa Mill. and S. glutinosa Growing in Ankara, Turkey

The monoterpene fraction was the main group of the compounds (73.93%), of which monoterpene hydrocarbons were the prevailing group (69.23%) compared to oxygenated monoterpenes (4.70%), while sesquiterpenes constituted 11.17% of the oil.

Outputs presented here do not support the findings of some previous study for example, Arslan15 reported camphor, α-pinene and β-thujone as the main constituents of S. tomentosa oil, in which camphor is abundant (17.68%).

In another report, α-pinene (25.1%), camphor (14.9%) and borneol (13.2%) were identified as the major components of Turkish S. tomentosa7. However, the main component is of monoterpene hydrocarbons but oxygenated monoterpenes comprises great proportion of the oil, a record that doesn't match the previous output in which the mentioned fraction just constitutes 4.7% of the oil. On the other hand, chemical composition of the oil of this herbal species corresponded on a large scale to previous results refereeing to Turkish samples in which GC and GC/MS analyses revealed that the major constituents of the oil were β-pinene (39.7%), α-pinene (10.9%) and camphor (9.7%)16. Chemical composition and bioactivity of essential oil from S. tomentosa natively grown in Bulgaria were investigated. GC-MS analysis identified 60 compounds through which the prevalent constituents were monoterpenes with borneol (10.3%) as the dominant compound17.

Thirteen components, representing 88.24% of the oil, were identified in S. glutinosa. The most abundant constituents were β-caryophyllene (19.34%), germacrene-D (17.06%), α-humulene (9.81%) and caryophyllene oxide (8.09%). Monoterpene hydrocarbon compounds were not detected, even in traces, in the oil. The leaf essential oil was dominated mainly by sesquiterpene hydrocarbons (59.28%), followed by oxygenated sesquiterpenes (19.51%). Phytol diterpene was only detected in the oil of S. tomentosa leaves.

Components from other fractions were characterized as prominents in some previous studies: Oxygenated sesquiterpenes (1-octadecanol and caryophyllene oxide) from Turkey18, oxygenated monoterpenes (Bornyl acetate) from Yugoslavia19, whereas in some others, sesquiterpene hydrocarbons were predominant: γ-muurolene was found as the major component for the leaves and flowering tops of S. glutinosa growing in Italy20. The GC-MS analysis of S. glutinosa oil from Greece, also, revealed butyl butyryl lactate (26.7%) as major component where sesquiterpene hydrocarbon compounds constituted 32.2%21. The presence and percentage of inter and intra-species constituents in the oil depends upon the external factors and localities. Detection of phytol in S. glutinosa specimen, for instance, could be a brilliant example for inter-species components. Inter-species comparing revealed that the oil of S. officinalis was rich with oxygenated monoterpenes, among which β-thujone was the characteristic components. While it was neither detected in S. tomentosa nor in S. glutinosa. β-pinene, absent in S. glutinosa, was the highest in the leaf oil of S. tomentosa, while it was lower in that of S. officinalis.

CONCLUSION

It is concluded that current study findings on S. glutinosa showed oil-poor species of Lamiaceae which possess oils rich in sesquiterpene hydrocarbons. On the other hand, β-caryophyllene predominance of essential oil seems to be unique of the Turkish S. glutinosa, that hasn't been reported elsewhere.

SIGNIFICANCE STATEMENT

This study evaluates essential oil content and constituents of three Salvia species namely Salvia officinalis, S. tomentosa and S. glutinosa in Ankara ecological conditions and reveals promising results on the components of species especially S. glutinosa including β-caryophyllene.

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