Bioactive phenylpropanoids from daucus crinitus Desf. from Algeria

Article abstract of DOI:10.1021/jf903760b

The volatile constituents of Daucus crinitus Desf. from Algeria were analyzed by GC and GC-MS, The main constituent was isochavicol isobutyrate (39.0%), an uncommon phenylpropanoid. By synthesis of a series of homologous esters, it was also possible to determine the presence of small amounts of isochavicol propionate, which has never been described previously as a natural product. The antibacterial and antifungal activities of the whole essential oil, of these two esters, and of isochavicol itself were investigated against a wide range of bacteria and fungi. Additionally, their antimalarial and antiradical properties were also evaluated, showing an interesting antiplasmodial activity of isochavicol. 2010 American Chemical Society.

Full text of DOI:10.1021/jf903760b

2174 J. Agric. Food Chem. 2010, 58, 2174–2179
DOI:10.1021/jf903760b
Bioactive Phenylpropanoids from Daucus crinitus
Desf. from Algeria
D
ON-ANTOINE
L
ANFRANCHI,† HOCINE
L
AOUER,‡ MERIEM
§
E
L
K
OLLI,‡ SOIZIC
,#
P
RADO,*,§
C
HRISTINE
MAULAY-BAILLY
,
AND
N
ICOLAS
B
ALDOVINI
*
†
ꢀ
Universite de Corse-CNRS, UMR 6134 SPE, Equipe Chimie et Biomasse, Route des Sanguinaires,
20000 Ajaccio, France, ‡Laboratory of Natural Resources Valorization, Department of Biology,
University of Setif, Mabouda 19000, Setif, Algeria, §Laboratoire de Chimie et Biochimie des Substances
ꢀ
Naturelles-UMR 5154 CNRS, Museum National d’Histoire Naturelle, 63 rue Buffon, 75005 Paris,
France, and #Laboratoire de Chimie des Molecules Bioactives et des Aromes, Universite de Nice
Sophia-Antipolis, CNRS UMR 6001, Parc Valrose, F-06108 Nice cedex 2, France
ꢀ
^
ꢀ
The volatile constituents of Daucus crinitus Desf. from Algeria were analyzed by GC and GC-MS,
The main constituent was isochavicol isobutyrate (39.0%), an uncommon phenylpropanoid. By
synthesis of a series of homologous esters, it was also possible to determine the presence of small
amounts of isochavicol propionate, which has never been described previously as a natural product.
The antibacterial and antifungal activities of the whole essential oil, of these two esters, and of
isochavicol itself were investigated against a wide range of bacteria and fungi. Additionally, their
antimalarial and antiradical properties were also evaluated, showing an interesting antiplasmodial
activity of isochavicol.
KEYWORDS: Daucus crinitus; isochavicol esters; antibacterial activity; antifungal activity; antimalarial
activity
INTRODUCTION
tional belief maintains that the ingestion of its raw roots can cure
spells.
The phytochemistry of the genus Daucus (Apiaceae) has been
extensively studied in analytical works on the composition of
various extracts of its members. Hence, the presence of
flavonoids (1-3), carotenoids (4), polyacetylenes (5), anthoc-
yans (6), and volatile constituents (7-12) was reported in studies
concentrated mainly on miscellaneous subspecies of Daucus
carota, but some less common Daucus species were also investi-
gated, almost exclusively through the analysis of their essential
oils: Daucus reboudii Coss. (7), Daucus glaber Forsk. (9), Daucus
gingidium L. (11), Daucus syrticus Murb. (12), etc. The biological
activities of Daucus essential oils, mostly Daucus carota ssp., have
been reported in several studies, which emphasized their
antibacterial (13-17) and antifungal (13,18-20) activities, which
were, however, rarely attributed to single constituents (17).
Daucus crinitus Desf. (syn. D. meifolius Brot.) is one of the 11
Daucus species growing in Algeria. It is distributed in Northern
Africa as well as in the Iberic peninsula and is a perennial plant
with erect stems often longer than 50 cm and leaves (10-20 cm)
divided into numerous linear pseudoverticillate segments.
Its basal leaves are hairy, numerous, and suberect, and the
umbels are convex or flat with unequal rays. It has nontuberous
taproots usually 6 cm long, and its fruits are small (average
weight = 3.25 g/1000 seeds). In Algeria, it is locally known as
“Fassoukh” and as “Eurq Sidi Messaoud” (21) and the tradi-
To the best of our knowledge, no previous phytochemical
investigation of D. crinitus has been reported in the literature. In
the course of our studies of the Algerian species, we noted that the
volatiles of D. crinitus contained an important part of uncommon
phenylpropanoids structurally related to several interesting anti-
microbial and antiparasitic compounds recently discovered in the
genus Pimpinella (22, 23). Accordingly, we undertook an exten-
sive screening of the biological activities of the essential oil of
D. crinitus, as well as of two of its constituents, isochavicol
isobutyrate (2) and isochavicol propionate (3), the latter being
reported here for the first time.
MATERIALS AND METHODS
Chemicals. Standard compounds, solvents, and reagents were pur-
chased from Sigma-Aldrich, except linalool, caryophyllene oxide, and
triethylamine, obtained from Fluka. Diethyl ether was dried by refluxing
on sodium/benzophenone before use.
Plant Material. Aerial parts (including stems, leaves, and flowers)
were collected from wild-growing populations at full flowering stage, in
June 2006, at Megress Mountain, Wilaya of Setif, in northeastern Algeria.
ꢀ
A voucher specimen was deposited in the Herbarium of the Museum
d’Histoire Naturelle de la ville de Nice (voucher B-8989).
Essential Oil Isolation. The aerial parts were hydrodistilled for 3 h
using a Clevenger type apparatus. The essential oil, obtained in 0.3% yield
(w/w) from dried material, was stored in hermetically sealed colored glass
vials in a refrigerator at 4 °C prior to analysis.
Gas Chromatography (GC) and Gas Chromatography-Mass
Spectrometry (GC-MS). GC and GC-MS analyses were carried out
using an Agilent 6890N gas chromatograph apparatus equipped with a
*Corresponding authors [(S.P.) telephone 33 (0)1 40 79 31 19, fax 33
(0)1 40 79 31 35, e-mail sprado@mnhn.fr; (N.B.) telephone 33 (0)4 92
07 61 33, fax 33 (0)4 92 07 61 25, e-mail baldovin@unice.fr].
pubs.acs.org/JAFC
Published on Web 01/25/2010
© 2010 American Chemical Society

Article
J. Agric. Food Chem., Vol. 58, No. 4, 2010 2175
flame ionization detector (FID) and coupled to a quadrupole Agilent 5973
network mass selective detector working in electron impact (EI) mode at
70 eV (scanning over the 35-350 amu range). The gas chromatograph was
equipped with two fused silica capillary columns HP-1 (PDMS, 50 m ꢀ
0.2 mm i.d., film thickness = 0.33 μm). The analytical parameters
(identical for GC and GC-MS analyses unless specified) were the follow-
ing: The carrier gas was helium at a flow rate of 1 mL/min. The oven
temperature was programmed from 60 to 250 at 2 °C/min and held
isothermal for 40 min. The injector (split mode, ratio 1/100) temperature
was 250 °C. The FID temperature was set at 250 °C, and in the GC-MS
analyses, the temperatures of the ion source and transfer line were 170 and
280 °C, respectively. Retention indices (RI) were determined from the
retention times of a series of n-alkanes with linear interpolation. Quanti-
tative data were obtained from FID area percentages without the use of
correction factors. The constituents of the essential oil were identified by
comparison of their mass spectral pattern and RI with those of pure
compounds registered in commercial libraries and literature data and with
a laboratory-made database built from authentic compounds. The identi-
fication of isochavicol esters 2-4 was carried out by co-injection of the
essential oil with ester mixtures synthesized from pure isochavicol (vide
infra).
[dd, 3H, J = 1.3, 6.3 Hz; H7], 2.79 [hept, 1H, J = 7.0 Hz; (CH3)2CH], 6.18
[dq, 1H, J = 6.3, 15.7 Hz; H6], 6.39 [br d, 1H, J = 15.7 Hz; H5], 6.99 [d,
2H, J = 8.6 Hz; H2], 7.32 [d, 2H, J = 8.6 Hz; H3]; 13C NMR δ 175.54,
149.54, 135.49, 130.04, 126.56, 125.72, 121.38, 34.08, 18.84, 18.20; EI-MS
m/z (%) 41 (5), 43 (27), 71 (5), 77 (8), 105 (5), 107 (5), 133 (38), 134 (100),
135 (10), 204 (5).
1
4-(Prop-(1E)-enyl)phenyl Propionate (3) (67%). H NMR (Figure S4
of the Supporting Information) δ 1.26 [t, 3H, J = 7.5 Hz; CH3CH2], 1.87
[dd, 3H, J = 1.3, 6.3 Hz; CH3CH2], 2.58 [q, 2H, J = 7.5 Hz; CH2CO], 6.18
[dq, 1H, J = 6.3, 15.7 Hz; H6], 6.38 [br d, 1H, J = 15.7 Hz; H5], 7.00 [d,
2H, J = 8.6 Hz; H2], 7.32 [d, 2H, J = 8.6 Hz; H3]; 13C NMR (Figure S5 of
the Supporting Information) δ 173.00, 149.40, 135.59, 130.00, 126.63,
125.88, 121.48, 27.73, 18.49, 9.08; EI-MS m/z (%) 57 (10), 77 (8), 105 (6),
107 (7), 115 (4), 117 (5), 133 (51), 134 (100), 135 (10), 190 (6) (Figure S7 of
the Supporting Information).
Bacterial Strains and Culture Conditions. References strains of
Escherichia coli (ATCC 9739), Staphylococcus aureus subsp. aureus
(ATCC 6538), Nocardia asteroides (ATCC 19247), Klebsiella pneumoniae
(IBMC Strasbourg), Staphylococcus hemolyticus (IBMC Strasbourg),
Salmonella enterica subsp. enterica, Serovar Enteritidis (Institut de Biolo-
ꢀ
gie Moleculaire et Cellulaire, Strasbourg), Mycobacterium bovis BCG
NMR. The NMR spectra were recorded on a Bruker WM 200 MHz
spectrometer in CDCl3. The chemical shift values are reported with
reference to tetramethylsilane, and the coupling constants are given in hertz.
Essential Oil Fractionation. The essential oil was submitted to flash
chromatography on 40-63 μm silica gel, using petroleum ether with
increasing amounts of diethyl ether as eluent. The fractions were analyzed
by GC-MS, and those containing the isochavicol esters were gathered for
the preparation of isochavicol.
Synthesis of Reference Compounds. Isochavicol (1). D. crinitus
essential oil fraction rich in isochavicol esters (prepared as described
above) (1.01 g) was diluted in 6 mL of anhydrous diethyl ether and added
dropwise to a stirred suspension of 362 mg of lithium aluminum hydride
(LAH) in diethyl ether (15 mL). The mixture was stirred at room
temperature for 24 h, then cooled to 0 °C, and quenched by the sequential
addition of water and diluted hydrochloric acid until acidic pH. The
mixture was then decanted and the aqueous layer extracted twice with
diethyl ether. The combined organic phases were washed with brine, dried
on magnesium sulfate, and evaporated to give 907 mg of a slightly yellow
oil, which was purified by flash chromatography on silica gel using
petroleum ether/diethyl ether 4:1 as eluent, to give finally 324 mg of
4-(prop-(1E)-enyl)phenol (isochavicol 1) as white crystals: 1H NMR δ 1.85
[dd, 3H, J = 1.5, 6.4 Hz; H7], 4.68 [s, 1H, OH], 6.08 [dq, 1H, J = 6.4,
15.7 Hz; H6], 6.33 [br d, 1H, J = 15.7 Hz; H5], 6.76 [d, 1H, J = 8.7 Hz;
H2], 7.21 [d, 1H, J = 8.7 Hz; H3]; 13C NMR δ 154.38, 130.86, 130.24,
127.02, 123.42, 115.38, 18.69; EI-MS m/z (%) 77 (22), 91 (14), 103 (9), 105
(28), 107 (29), 115 (12), 117 (9), 119 (10), 133 (78), 134 (100).
(Pasteur), and E. coli, PQ37 (F- thr leu his-4 pyrD thi galE galK lacΔU169
srl300::Tn10 rpoB rpsL uvrA rfa trp::Mucþ sfiA::Mud (Ap, lac) cts), were
obtained from the Collection of the Institute Pasteur, Paris, France. The
essential oil was screened as toxic against Plasmodium falciparum FcB1,
ꢀ
which was from the Museum National d’Histoire Naturelle. Bacteria
species were cultivated for 24 h in Mueller Hinton’s medium (MH) at 37 °C
except N. asteroides ATCC 19247, which was cultivated in heart-brain
infusion (HBI) at 30 °C for 48 h, at 30 °C in malt extract agar for
Aspergillus niger, and in Sabouraud dextrose medium (Sanofi Diagnostic
Pasteur) for Candida albicans.
Disk Diffusion Assay. The antibacterial activity of the essential oil
was evaluated using the agar diffusion test according to the Kirby-Bauer
method (24) with small adaptations. Briefly, culture suspension of the
tested microorganisms (approximately 106 CFU/mL) was spread on the
solid medium plates (40 mL). Five microliters of serial dilutions in
dimethyl sulfoxide (DMSO) (1/2, 1/5, and 1/10 v/v) of the essential oil
were placed onto the solid media plates. The diameter of inhibition was
measured after 24 or 48 h of incubation at 30 or 37 °C. Ampicillin,
itraconazole, and DMSO were used as positive and negative controls,
respectively.
Minimum Inhibitory Concentration (MIC) Determinations for
Mycobacteria. MICs were determined using the new microdilution
resazurin assay (MRA) (25). Resazurin salt powder (Sigma) was prepared
at 0.01% (w/v) in distilled water, sterilized by filtration through a 0.22 μm
membrane, and stored at 4 °C for a week. Drug stock solutions were
prepared in DMSO at a concentration of 20 mg/mL and frozen until used.
The inocula were prepared from M. bovis BCG strains grown in 7H9
medium supplemented with 10% albumin, dextrose, catalase (ADC)
enrichment. Two microliters of 2-fold serial dilutions of each drug was
prepared in 200 μL of 7H9 medium directly in 96-well plates at concentra-
tions from 100 to 0.1 μg/mL. Growth controls containing DMSO and
isoniazid (from 1 μg/mL to 1 ng/mL) were also included. The plates were
covered, sealed, and incubated at 37 °C. After 8 days, 30 μL of resazurin
solution was added to each well and plates were allowed to incubate at
37 °C for an additional 24 h. A change from blue to pink indicates
reduction of resazurin and therefore bacterial growth. The MIC was
defined as the lowest drug concentration that prevented this color change.
Cytotoxicity Evaluation. VERO cell lines were maintained in
Dulbecco modified Eagle medium (DMEM) supplemented with 5% fetal
calf serum (FCS), at 37 °C in air with 5% CO2. Proliferating cells were
seeded in 96-well microtitration plates at a density of 105 cells/mL, which
were further incubated for 24 h at 37 °C under 5% CO2 in air before each
assay. Various concentrations of solutions of compounds in 1% DMSO
were added and then incubated for 48 h as described above. At the end of
this, 20 μL of dimethylthiazolyldiphenyl tetrazolium bromide solution
(MTT, Sigma) (5 mg/mL) was added to each well and further incubated
for 4 h at 37 °C to allow the formation of formazan. The crystals of
formazan were then dissolved with 100 μL of a freshly prepared solution of
sodium dodecyl sulfate (SDS) 10% (15 mL) and 1 N HCl (150 μL). The
optical density of each well was measured at 595 nm using a multiwell plate
Isochavicol Esters. The typical procedure was performed as follows: To
1 equiv of 1 diluted in dichloromethane (DCM) (ca. 4 mL/100 mg 1) were
added sequentially under stirring 1.2 equiv of triethylamine and 1.3 equiv
of acyl chloride (either as a single compound or in mixture). The solution
was stirred for 24-72 h and then poured into water. After decantation, the
aqueous phase was extracted twice with DCM, and the combined organic
phases were washed with brine, dried on magnesium sulfate, and evapo-
rated to give an oily product, which was purified by flash chromatography
on silica gel using petroleum ether/diethyl ether for elution. In the case of
the preparation of the ester mixtures, a simple filtration on silica gel using
such a type of eluent was sufficient. The pure or mixed esters were finally
obtained as colorless oils.
Ester Mixture 1. The use of a mixture of acetyl, n-butyryl, n-valeryl and
n-hexanoyl chlorides as acylating agents (respective massic percentages:
20, 25, 27, and 27%) furnished 49 mg of a mixture of isochavicol acetate,
n-butyrate, n-valerate and n-hexanoate from 33 mg of isochavicol (Figure
S1 of the Supporting Information).
Ester Mixture 2. The use of a mixture of propionyl, isobutyryl, and
2-methylbutyryl chlorides as acylating agents (respective massic percen-
tages of 25, 47, and 28%) furnished 24 mg of a mixture of isochavicol
propionate (3), isobutyrate (2), and 2-methylbutyrate (4) from 25 mg of
isochavicol (Figure S2 of the Supporting Information).
4-(Prop-(1E)-enyl)phenyl Isobutyrate (2) (64%). 1H NMR (Figure S3
of the Supporting Information) δ 1.31 [d, 6H, J = 7.0 Hz; (CH3)2CH], 1.87

2176 J. Agric. Food Chem., Vol. 58, No. 4, 2010
Lanfranchi et al.
reader. The 50% inhibition concentration was then determined by curve
fitting.
MIC Determination for Bacteria. Precultures of the tested micro-
organisms were made by inoculating 10 mL of Luria-Bertani (LB) and
incubating for 24 h. A culture suspension were made by 1/1000 dilution
from preculture and seeded in 96-well microtitration plates. One microliter
of 2-fold serial dilutions of each drug was prepared in 100 μL of LB. The
plates were incubated at 37 °C. After 24 h, the optical density of each well
was measured at 595 nm using a multiplate reader. The 90% inhibition
concentrations for the most active compounds were determined by curve
fitting.
Figure 1. Structures of isochavicol (1) and of constituents 2-4 of
D. crinitus essential oil.
Antifungal Activity. Activities of the more active compounds were
evaluated on the growth of C. candida and A. niger using the standardized
filter paper disk (6 mm non-impregnated disk; Antibiotica assay disks,
grade 2668 Schleider and Schuell) diffusion method according to the
Kirby-Bauer method (24). Briefly, a suspension of C. albicans was
spread on solid Sabouraud medium plates (20 mL). Filter paper disks
were impregnated with 10 μL of serial dilutions in DMSO of the
compounds and placed onto the solid medium plates. The diameter of
inhibition was measured after 24 h of incubation at 30 °C. Itraconazole
was used as positive control.
Genotoxicity Assay: SOS-Chromotest. The capacity of the drugs to
induce DNA damage is monitored with the SOS-chromotest (26). This test
is based on a genetically engineered E. coli strain, PQ37, licensed from the
Institute Pasteur, which measures the primary response of a cell to
genotoxic damage. This strain harbors the lacZ gene under the control
of sfiA, a gene involved in the SOS response. DNA damage results in the
activation of the SOS system, which in turn induces the transcription and
synthesis of β-galactosidase. This enzyme is detected by a chromogenic
reaction with the substrate X-gal.
Antiplasmodial Activity. The antiplasmodial activity was evaluated
against the chloroquine-resistant FcB1/Colombia strain of Plasmodium
falciparum. The test was performed using the method of Desjardins
et al. (27). Extracts and pure compounds were diluted in DMSO at
20 μg/mL with culture medium to the expected concentrations in 96-well
microplates. Asynchronous parasite cultures were then added (1% para-
sitemia and 1% final hematocrite), and plates were maintained for 24 h at
37 °C in a candle jar. [3H]Hypoxanthine (0.5 μCi) was subsequently added
to each well, and parasites were maintained for an additional 24 h. After
freezing and thawing, the cells were harvested from each well onto glass
fiber filters, and the dried filters were counted in a scintillation spectro-
meter. The growth inhibition for each well was determined by comparison
of the radioactivity incorporated into the treated culture with that in the
control culture maintained on the same plate. The concentration causing
50% inhibition (IC50) was obtained from the drug concentration-
response curve. The DMSO concentration never exceeded 0.1% and did
not inhibit the parasite growth.
Determination of DPPH Radical Scavenging Activity. 2,2-Di-
phenyl-1-picrylhydrazyl (DPPH) radical scavenging activitywas measured
according to the procedure described by Lopes-Lutz et al. (28). Briefly,
0.2 mM DPPH (Sigma, St. Louis, MO) in methanol solution was
prepared. Ten microliters of 2-fold serial dilutions of each drug in
methanol was added to 190 μL of DPPH solution in 96-well microplates.
After incubation for 30 min in the dark at room temperature, the
absorbance was measured at 510 nm. Ascorbic acid was used as positive
control, and DPPH plus methanol was used as negative control. The
concentration causing 50% inhibition (IC50) was obtained from the drug
concentration-response curve.
substance (RI = 1643) was detected at a relatively high percen-
tage, and the examination of it mass spectrum suggested that it
was structurally related with the main constituent: both had a
base peak at m/z 134, and some of their other fragments were
separated by 14 amu, as is typically the case between one-carbon
homologues. To identify these two components, the oil was
fractionated by flash chromatography, and a fraction containing
only a mixture of these two compounds was obtained and studied
by NMR. The combination of the MS and NMR data was
consistent with the structures 2 and 4 (Figure 1), but to ensure
their characterization, we first reduced this mixture with LAH
and identified unambiguously isochavicol (1) as the main product
of the reaction. Then, for definitive proof, we planned to esterify 1
back to 2 and 4, but to allow a deeper investigation of the
isochavicol esters potentially contained in the oil, we synthetised a
series of mixed homologous esters by reacting 1 with mixtures of
various acyl chlorides. Hence, isochavicol acetate, n-butyrate, n-
valerate, and n-hexanoate constituted the first mixture, and
isochavicol propionate (3), isobutyrate (2), and 2-methylbutyrate
(4) the second one. Both of these mixtures were cleanly separated
in the GC-MS conditions, and the attribution of each peak to its
parent component was done easily from the MS pattern and the
elution order on apolar column. These mixtures could then be
used as standard in coelution experiments with the whole oil,
which confirmed that the main component was isochavicol
isobutyrate (2) and the compound at RI = 1643 was the homo-
logous 2-methylbutyrate (4). However, we could not detect either
the acetate, n-butyrate, n-valerate, or n-hexanoate in the essential
oil, but we noted that the propionate (3) was an actual constitu-
ent, present at low amount (0.05%) (Figure S6 of the Supporting
Information). The relative concentrations of the volatile compo-
nents identified are presented in Table 1.
Despite their relative structural simplicity, a bibliographical
investigation of the natural occurrence of such isochavicol esters
showed that they are rather rare: 2 and 4 were identified in a
solvent extract of Moonia heterophylla Arn. (29), as well as in the
essential oil ofsomeApiaceae(30), especiallyinseveral Pimpinella
species (23). In the root oils of Pimpinella corymbosa, Pimpinella
olivieroides, and Pimpinella kotschyana, the percentage of 4
reached approximatively the same level as in our sample, whereas
in these species 2 was present in lower amounts (<0.8%) but
reached 1.8% in the fruit oil of Pimpinella peucadanifolia (23). To
the best of our knowledge, isochavicol propionate (3) was never
described in the literature.
In view of the recent evidence on the biological activity of
related isochavicol derivatives (22, 23), and as it is well-known
that phenylpropanoids often show interesting pharmacological
properties, we were interested to explore the activity of the
essential oil and the pure esters. Therefore, for full spectral and
biological characterizations, pure samples of 2 and 3 were
prepared by esterification of 1 with isobutyryl and propionyl
chloride, respectively. We scanned then the antibacterial, anti-
fungal, antimalarial, and antiradical potential of the whole oil
RESULTS AND DISCUSSION
GC-MS analyses were performed on the essential oil of
D. crinitus, as well as on the fractions obtained after flash
chromatography of the whole oil, to identify further minor
constituents and to separate coeluting compounds.
Our preliminary investigation of the GC-MS profile did
not permit us to identify the main (39.0%) constituent at RI =
1546. The second most abundant component was octyl
acetate (12.3%), followed by R-pinene (9.9%), and common
constituents of essential oils, mainly mono- and sesquiter-
penes present at lower amounts (<6%). Another unidentified

Article
J. Agric. Food Chem., Vol. 58, No. 4, 2010 2177
Table 1. Composition of D. crinitus Essential Oil
RIa
Table 2. Antimicrobial Activities of D. crinitus Essential Oil and of Compounds
1- 3
inhibition zone (mm)
c
compound
RIb
%
identificationd
R-thujenee
benzaldehyde
924
929
0.2
0.2
9.9
0.1
0.2
3.4
0.2
0.1
0.3
0.3
0.2
12.3
0.2
0.3
0.1
0.2
0.4
0.3
5.4
0.8
3.4
0.6
2.3
0.4
0.1
MS, RI
strain
E. coli
S. aureus
EOa (1/2) EO (1/5) EO (1/10) 1b 2b 3b ampc itrad
MS, RI, Std
MS, RI, Std
MS, RI, Std
MS, RI, Std
MS, RI, Std
MS, RI
R-pinene
oct-1-en-3-ol
932
963
1003
e
15
22
15
20
25
-
14
17
12
14
15
-
13
14
9
21
7
4
-
-
-
26 NTf
44 NT
32 NT
-
-
β-pinene
myrcene
(Z)-β-ocimenee
limonene
octan-1-ol
970
983
1090
1153
1206
1170
S. hemolyticus
E. faecalis
7
10
10
-
06
10
12
NT NT NT 30 NT
11
1021
1028
1055
1083
1180
1188
1302
1333
1347
1374
1382
1389
1420
1449
1451
1469
1469
1486
1489
1495
1500
1511
1546
1568
1643
1700
N. asteroides
K. pneumoniae
S. enteriditis
A. niger
7
6
21 NT
10 NT
MS, RI, Std
MS, RI, Std
MS, RI, Std
MS, RI, Std
MS, RI
-
-
-
06
17
25
06
15
22
NT NT NT 25 NT
NT NT NT NT 25
NT NT NT NT 26
linalool
decanal
octyl acetatee
1515
1447
C. albicans
myrtenyl acetatee
octyl 2-methylpropanoatee
R-cubebenee
MS, RI
MS, RI
a Essential oil; 5 μL of diluted essential oil (v/v) in DMSO. b 5 μL of diluted
compounds in DMSO (100 μg). c Ampicillin (15 μg). d Itraconazole (15 μg). e No
activity. f Not tested.
1438
MS, RI
MS, RI
R-copaenee
β-bourbonenee
β-elemenee
MS, RI
MS, RI
Table 3. MIC Determinations for the Most Sensitive Strains and Antimyco-
bacterial Activity of D. crinitus Essential Oil and of Compounds 1-3
β-caryophyllene
R-humulenee
1548
1648
1652
MS, RI, Std
MS, RI
MS, RI
MIC95 (μg/mL)
strain
EOa
1
2
3
ampicillin itraconazole
β-farnesenee
γ-muurolenee
germacrene De
R-selinenee
MS, RI
MS, RI
S. aureus
E. faecalis
N. asteroides 310
2.5 ꢀ 103 >200
>200
>200
>200
>200
0.05
0.4
2
NTb
NT
NT
0.4
5 ꢀ 103
>200
MS, RI
MS, RI
R-muurolenee
isochavicol propionate (3)
n-pentadecane
β-sesquiphellandrenee
isochavicol isobutyrate (2)
caryophyllene oxide
isochavicol 2-methylbutyrate (4)
n-heptadecane
15.8
200
60.5
25
42.5
50
M. bovis
>5 ꢀ 103
NT
2104
1500
1741
2097
1932
2189
1700
0.05
MS, RI, Std
MS, RI, Std
MS, RI
a Essential oil. b Not tested.
2.8
2.6
39.0
0.5
MS, RI, Std
MS, RI, Std
MS, RI, Std
MS, RI, Std
Strains of K. pneumoniae and S. enteriditis were also particularly
insensitive to the essential oil even at the highest amount used in
this assay. This was also true for compounds 1-3 except for
isochavicol 1, which showed a good activity against E. coli
(diameter of inhibition = 21 mm) at the concentration tested
(100 μg). Moreover, as shown in Table 2, a more potent result was
seen with S. aureus because diameters of inhibition of the essential
oil dilutions were, respectively, 22, 17, and 14 mm, as well as with
S. hemolyticus (diameters of, respectively, 15, 12, and 9 mm). The
most strongly affected Gram-positive strain was N. asteroides,
because the diameter of inhibition for the 1/2 dilution of the
essential oil (25 mm) is fairly close to the effect of ampicillin
(30 μg). Compounds 1-3 were also assayed for their inhibition of
Gram-positive strain growth. Surprisingly, the major constituent
of this essential oil, isochavicol isobutyrate (2), is devoid of
significant activity against these strains. This does suggest that,
although it is the main component, this compound is not the
source of the antibacterial properties of the entire essential oil, but
the presence of high quantities of terpenes such as R-pinene
(9.9%), myrcene (3.4%), and β-caryophyllene (5.4%) could
explain the growth inhibition observed.
6.5
1.2
total identified
94.6
a Retention indices on HP-1 column relative to C7-C22 n-alkanes. b Retention
indices on HP-20 column relative to C7-C22 n-alkanes. c Area FID (HP-1 column).
d Method of identification: MS, by comparison of the mass spectrum with those of the
computer mass libraries; RI, by comparison of RI with those from the literature; Std,
by co-injection of an authentic sample. e Compound tentatively identified according
to its mass spectrum and by comparison of its retention indices with those of the
literature.
and its major component (2). In this study, we included also the
new compound 3, which can be considered as a close analogue of
2 with probably a different reactivity toward enzymatic cleavage,
as well as isochavicol itself (1), for comparison purposes, even if it
is not a constituent of the oil.
The essential oil of D. crinitus was first assayed for its
mutagenic potential using an SOS-chromotest. No mutagenic
effect of the essential oil was observed at the different concentra-
tions tested (crude extract, 1/2, 1/5, and 1/10 dilutions), thus
underscoring the interest to pursue the investigations of the
biological activities.
The same lack of effect was observed for 3, and only isocha-
vicol 1 possesses a weak activity against N. asteroides.
The antimicrobial activities of the essential oil of D. crinitus
and of compounds 1-3 were then evaluated against a range of
Gram-negative (E. coli, K. pneumoniae, S. enteriditis) and Gram-
positive (E. faecalis, S. aureus, S. hemolyticus, N. asteroides)
bacteria and two strains of fungi (C. albicans and A. niger). These
activities were first determined by measuring the zone of growth
inhibition of serial dilutions of the essential oil. Ampicillin and
itraconazole were employed as positive controls.
The essential oil of D. crinitus turned out to be devoid of
significant antimicrobial activity against the growth of the Gram-
negative bacteria tested. As shown in Table 2, the 1/2 dilution of
the essential oil displays a weak activity (inhibition zone =
15 mm) against E. coli compared to ampicillin control (26 mm).
At the same dilution range, the inhibition effect seen on fungus
growth was of interest. Indeed, a diameter of inhibition of about
25 mm was seen against C. albicans at the highest concentration
used, which is to be compared to itraconazole (26 mm).
The MIC of the compound against the most sensitive bacterial
strains were then determined (Table 3). The results obtained were
disappointing compared to the antibiogram. Indeed, no signifi-
cant MIC was seen for the essential oil or for the derivatives 1-3
on the bacterial strains tested (MIC > 200 μg/mL), except on
N. asteroides. Indeed, a MIC95 of 310 μg/mL was measured for
the essential oil, which is fairly weak when compared to the
control ampicillin (MIC95 = 2 μg/mL). On the other hand, the
isochavicol derivatives 1-3 have very good activities, with MICs

2178 J. Agric. Food Chem., Vol. 58, No. 4, 2010
Lanfranchi et al.
Table 4. Antiplasmodial, Cytotoxic, and Antiradical Activities of D. crinitus Essential Oil and of Compounds 1-3
IC50 (μg/mL)
strain
EOa
1
2
3
chloroquine
camptothecin
ascorbic acid
P. falciparum
VERO cells
antiradical activity
26.7
82
1.9
26.8
1 ꢀ 103
14.0
26.5
>1 ꢀ 103
13.3
14.6
>1 ꢀ 103
0.2
NT
NT
NTb
0.4
NT
NT
NT
12
85 ꢀ 103
a Essential oil. b Not tested.
ranging between 16 and 61 μg/mL. The essential oil and 1-3 were
also evaluated for their antimycobacterial activity against
M. bovis BCG. As for N. asteroides, a good activity was obtained,
in particular for the isochavicol isobutyrate, with a MIC95 of
25 μg/mL. The inhibitory effect observed both on the actinomy-
cete N. asteroides and on M. bovis, which share similar cell wall
constituents (31), suggests an effect on the biosynthesis of these
constituents, namely, the mycolic acids. Further studies will be
necessary to confirm this hypothesis.
Compounds isolated from Pimpinella species are structurally
related with chavicol derivatives and present good activity against
P. falciparum (22, 23). Accordingly, we investigated the antima-
larial effect of 1-3. The results of the parasite growth screening
showed that all of these compounds present a good activity
against P. falciparum, especially isochavicol 1, with an IC50 of
around 2 μg/mL (Table 4). The cytotoxicity against VERO cells
was also investigated, and no effect was seen for the essential oil
either for the isochavicol derivatives at 10 μg/mL (IC50 from 15 to
82 μg/mL). This is particularly interesting for the most active
compound isochavicol 1 against P. falciparum as its cytotoxicity is
around 27 μg/mL. This provides a relatively promising selectivity
index (SI > 12).
In the course of this extensive screening of biological activities
of the essential oil of D. crinitus and of some of its constituents
and derivatives, we also investigated their antiradical activity
using a DPPH test (Table 4). Unfortunately, no activity was seen,
(IC50 g 1 ꢀ 103 μg/mL) in comparison with the ascorbic acid used
as control (IC50 = 12 μg/mL).
In conclusion, the essential oil of D. crinitus presents a modest
antimicrobial activity against bacteria and fungi. Nevertheless, its
main constituent, isochavicol isobutyrate 2, as well as the related
propionate (3), and isochavicol (1) have interesting activities
against both M. bovis and N. asteroides, suggesting a possible
specificity against mycolates biosynthesis. Further work on this
hypothesis will be reported in due time.
parasitical laboratory. We thank too the Covalmar Society for
the use of their microplate reader.
Supporting Information Available: Figures S1-S8. This
material is available free of charge via the Internet at http://
pubs.acs.org.
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ACKNOWLEDGMENT
We thank Manon Vandervennet for careful technical assis-
tance in bacteriology and Philippe Grellier for access to its

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Received for review October 27, 2009. Revised manuscript received
December 24, 2009. Accepted December 26, 2009.