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Aconitine involvement in an unusual homicide case
Article in International Journal of Legal Medicine · June 2007
DOI: 10.1007/s00414-006-0119-5 · Source: PubMed
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Int J Legal Med (2007) 121:214–219
DOI 10.1007/s00414-006-0119-5
CASE REPORT
Aconitine involvement in an unusual homicide case
An A. Van Landeghem & Els A. De Letter &
Willy E. Lambert & Carlos H. Van Peteghem &
Michel H. A. Piette
Received: 13 April 2006 / Accepted: 12 July 2006 / Published online: 5 October 2006
# Springer-Verlag 2006
Abstract We describe a homicide complicated by an
aconitine poisoning, which was initially thought to be a
strangulation case. Routine toxicological analyses demonstrated only a small amount of alcohol in the blood and the urine.
The case could not be clarified until 5 years after the event. A
new element in the investigation made the wife the prime
suspect, and finally, after thorough interrogation, she confessed her crime. She had mixed a decoction of three plants of
Aconitum with red wine. Additional toxicological analyses,
using the liquid chromatography–tandem mass spectrometry
(LC-MS-MS) technique demonstrated 810 ng/ml of aconitine
in urine, 6.5 ng/g in liver and 1.3 ng/g in the kidneys. Even
though aconitine poisoning is still rare in Europe, it should be
taken into account in suicides and homicides, particularly in
unclarified cases.
Keywords Aconitine . Intoxication . Homicide .
Strangulation . LC-MS-MS
Introduction
Aconitum is a genus of plants belonging to the Ranunculacea family, consisting of about 60 species. The blueflowered Aconitum napellus L., also known as monkshood
A. A. Van Landeghem : E. A. De Letter : M. H. A. Piette (*)
Department of Forensic Medicine, Ghent University,
J. Kluyskensstraat 29,
B-9000 Gent, Belgium
e-mail: Michel.Piette@Ugent.be
W. E. Lambert : C. H. Van Peteghem
Laboratory of Toxicology, Ghent University,
Harelbekestraat 72,
B-9000 Gent, Belgium
(Fig. 1), is an ornamental plant in Europe, and together with
other Aconitum species, is used in Asian herbal medicines
[2, 5, 7, 8, 13, 14, 34, 35, 37, 40]. The roots of Aconitum
can be processed by soaking or boiling in water, which
leads to hydrolysis of the aconite alkaloids into less toxic
derivatives [2, 39]. The substance aconitine, belonging to
the group of diesterditerpene alkaloids [1, 9, 35, 37], is
present in the root, stalks, flowers and leaves [2, 3, 13, 30].
One gram of the root has been fatal and the estimated lethal
oral dose of aconitine for humans is 2 mg [4]. Aconitine
poisoning is most frequently caused by accidental ingestion, as it can be mistaken for an edible grass and by the use
of herbal medicines, mainly in Asian countries where these
are more used [7, 8, 23–25, 35, 40, 41]. A few fatal
accidents have been reported [5, 7, 8, 14, 17, 35, 36, 41],
and as it is highly toxic, aconitine or Aconitum species are
sometimes used in suicides and homicides [11–13, 20, 28,
36]. Even in ancient times it was known as a poison [29]. In
the nineteenth century, a few cases were reported in which
doctors committed a homicide by the use of aconitine [22].
However, aconitine poisoning remains rare in Europe.
An interesting review of the effects of aconitum
alkaloids is presented by Ameri: the difference in action
and toxicity of aconitine is compared with those of other
alkaloids such as mesaconitine, lappaconitine [1]. Aconitine
is a neurotoxin that binds to the neurotoxin site 2 of the
sodium channel. This causes a continuous activation by
increasing the inflow of sodium ions preventing complete
repolarisation of the excitable membrane of neural, muscle
and cardiac tissues [1, 16]. The latter results in severe,
potentially life-threatening arrhythmias, such as cardiac
flutter and fibrillation [1, 16]. Symptoms of acute poisoning
usually appear within 2 h after oral intake, although the
initial signs can occur within a few minutes [3, 7, 17, 20,
24, 33, 34]. The latter normally include neurological
Int J Legal Med (2007) 121:214–219
215
after several years did his wife admit that she had mixed a
decoction of the Aconitum plants in a bottle of wine. We
would like to draw attention to a relatively rare manner of
intoxication and to the fact that this substance may be used
for homicidal purposes. In addition, this substance is not
routinely tested in current forensic practice.
Case history
Fig. 1 Aconitum napellus (overview (a) and detail (b))
features such as numbness in the mouth and lips, dizziness,
paraesthesia, intense pain and generalised muscle weakness
due to parasympathic activation and sensory nerve ending
stimulation. Afterwards, gastro-intestinal features (e.g.
vomiting, nausea, diarrhea) and cardiovascular symptoms
(e.g. hypotension, bradycardia, ventricular arrhythmias)
appear [6–9, 11, 12, 14, 15, 24, 28, 30, 35, 40, 41]. An
intoxication can range from relatively mild symptoms to a
severe life-threatening situation. In fatal intoxications, death
finally occurs due to respiratory paralysis or cardiovascular
collapse [1, 8, 9, 41].
As a small amount of aconite can be toxic, identification
can be difficult, and therefore, a sensitive method is needed.
This is indeed applicable to the toxicological analysis of all
herbal medicines [10]. Gas chromatography–mass spectrometry in the selected ion monitoring mode (GC-MS/
SIM) is sensitive and specific [20, 37, 38]. Solid-phase
extraction using mixed-mode C8 cation exchange columns
followed by liquid chromatography–tandem mass spectrometry (LC-MS-MS) is also a valid method for the
precise detection of aconitine in whole blood and other body
fluids down to very low concentrations [3]. Due to the less
drastic analytical conditions and to the higher sensitivity,
LC-MS-MS became the method of choice for the analysis
of aconitine alkaloids.
We present an intricate fatal case. A man died after
aconitine poisoning and possible strangulation, and only
About 100 km from his home, a man in his fifties was
found dead behind the steering wheel of his car, the front of
which was lying in a deep pitch running beside a highway.
The presence of a carbonised fuse hanging from the fuel
tank made the scene suspicious. In addition, the postmortem examination at the scene revealed signs of asphyxia
such as a pronounced cyanotic face. At autopsy, numerous
ecchymoses and abrasions were found, indicating that the
man had suffered frequent blunt traumatic violence on his
head, face, back, arms and legs. In addition, lesions
compatible with strangulation were discovered (such as a
vital fracture of the upper horn of the thyroid bone), and
thus, a simple frontal deceleration was excluded.
Blood, urine (150 ml), gastric contents (50 ml), liver and
kidneys were sampled for toxicological analyses, and
routine screening for alcohol and drugs was performed.
The blood alcohol level was 0.23 g/l and urine alcohol
concentration was 0.34 g/l. No other drugs or toxic agents
were initially detected.
The police investigation was unable to clarify this case
for 5 years. However, DNA analysis on the stamp of a
letter, which was thought to have been sent by the victim,
demonstrated that it belonged to his wife and she confessed
the story. She had prepared a decoction of Aconitum
napellus made by boiling three plants, using the leaves
and stalks. She mixed this decoction with a few tablets of
Halcion\ (triazolam) in a bottle of red wine. Her husband
drank this bottle at supper, and according to her statements,
he did not show any symptoms. She went to bed and about
3.5 h later, she found her husband lifeless in his chair. She
could not feel a pulse or heart beat and—in her opinion—
thought he had passed away, and so, she decided to move the
body. Using ropes and a piece of carpet (see Fig. 2),
she pulled the body up the staircase (Fig. 2a). Afterwards,
she changed her mind and pulled him down the stairs
(Fig. 2b,c) and placed it on the driver’s seat of the car
(Fig. 2d). Sitting on the lap of the dead body (Fig. 2e), she
drove a distance of 100 km. After she had pushed the car
into a pitch and attempted to burn the car, she left the scene
and called a taxi to get back home.
216
Int J Legal Med (2007) 121:214–219
Fig. 2 Representation of the various manipulations of the body by the accused
Experimental section
Chemicals and reagents
Instrumentation
The experiments were carried out on a Quattro LCZ mass
spectrometer (Micromass, Manchester, UK). Nitrogen was
used as nebulizer and desolvation gas, while argon served as
collision gas. The high performance liquid chromatography
(HPLC) consisted of a Waters Alliance 2690 configuration
(Milford, MA).
Aconitine was from Sigma (Bornem, Belgium) while
mesaconitine was provided by Kishida Chemical Company
(Osaka, Japan). Methanol and acetonitrile (LC-MS grade)
were purchased from BDH (Poole-Dorset, England) and
formic acid was from VWR (Leuven, Belgium). Doubledeionized water (Milli-Q, Millipore) of 18.2 MΩ cm−1
resistance was used throughout.
Int J Legal Med (2007) 121:214–219
217
Preparation of stock solutions and dilutions
Mass spectrometry
Stock solutions of 1 mg/ml of both aconitine and
mesaconitine were prepared in methanol. Working solutions
were prepared with a dilution solvent (acetonitrile: water,
50:50, by vol., containing 0.1% formic acid) to concentrations of 10 and 1 ng/μl, respectively.
For the preparation of urine sample calibrators (for the
screening), the 1-ng/μl working dilution was added to blank
urine, resulting in 14 calibrator levels ranging between 2
and 100 ng/ml. For the confirmation procedure, calibrators
at 100, 250, 500, 750, and 1,000 ng/ml were prepared.
Optimisation of the mass spectrometric signal was performed by continuous infusion of the standards at the level
of 1 ng/μl in the dilution solvent. The highest intensities
were obtained by electrospray (ESI) in the positive mode.
The following settings were applied: nebulizer gas (80 l/h),
desolvation gas (560 l/h) and collision gas (2.3×10−3 mbar).
An overview of the MS/MS transitions, collision energy
and cone voltages used during the screening (aconitine and
mesaconitine) and the final quantitation (only aconitine) is
given in Table 1. The ratio between the different transitions
was also taken into account as a criterion for identification.
Sample preparation
Toxicological data
Sample preparation was kept to an absolute minimum and
consisted of a tenfold dilution of the urine with the aforementioned dilution solvent. After centrifugation, a 100-μl
aliquot was injected into the HPLC system and was analysed
in triplicate (screening). For the confirmation analysis, the
urine was diluted 50-fold and a 25-μl aliquot was injected.
Liquid chromatography
Screening procedure
For screening, the samples were injected into a Waters
Oasis® HLB column (1.0×50 mm) and a gradient
elution with (A) acetonitrile and (B) water, both
containing 0.3% formic acid, was applied. From time 0
to 2.0 min, 100% B was used; between 2.0 and 2.5 min,
the solvent was changed to 100% A, and this composition was held for 1 min. Between 3.6 and 6.0 min, the
column was equilibrated under the starting conditions.
The flow rate was 4 ml/min of which 400 μl/min was
split to the mass spectrometer while the rest was
diverted to the waste.
Final analytical procedure
The final chromatographic separation was achieved on a
Waters XTerra column (150×2.1 mm ID) protected with a
Waters Symmetry guard column (10×2.1 mm ID) (Waters).
The same solvents were used as for the screening
procedure; however, the gradient profile was different.
From time 0 to 5.0 min, 25% A was used. Between 5.0 and
6.5 min, the percentage of A (organic phase) was increased
to 60%, and this was held to 10.0 min. Between 10.0 and
11.0 min, the solvent composition was changed back to the
starting conditions, and the system was equilibrated for
4 min under these conditions. The flow rate used was
300 μl/min.
During the initial screening procedure, two transitions were
used: one for aconitine and one for mesaconitine. With this
procedure, it became clear that aconitine was present in the
sample while mesaconitine was not. In addition, it was
shown that the aconitine level in the urine sample was far
above the highest calibrator (100 ng/ml) used for screening.
For the final measurement of aconitine, we used three
transitions (646→105, 646→368 and 646→586) at a
different collision energy. As quantifier transition,
646→105 was selected because of its higher intensity.
A 20-μl aliquot of the centrifuged urine was diluted to
1.00 ml with the dilution solvent, and 25 μl of this dilution
was injected in triplicate. The three transitions were
monitored, and the ratio between the transitions was similar
to the one obtained for the standard. This, together with the
similar retention time of a pure standard, confirmed the
identity of the peak as aconitine. The level of aconitine in
the urine sample was 810 ng/ml. Other method parameters
are summarised in Table 2.
Discussion and conclusion
We report a homicide case which was clarified only 5 years
later. After the DNA analysis of a stamp and the confession
Table 1 MS-MS parameters
Compound
Screening
Aconitine
Mesaconitine
Final quantitation
Aconitine
MRM
transitions
(m/z)
CE
CV
eV
V
646→105
632→105
55
55
55
60
646→105,368,586
55,40,40
60,60,60
CE Collision energy (electron voltage), CV cone voltage
218
Int J Legal Med (2007) 121:214–219
Table 2 Measurement characteristics
Compound
Aconitine
2
Range (ng/ml) Equation
r
100–1,000
y=933.36x−24.70 0.9966
Transition
ratios
Standard
SD
n
Urine
646→586/
646→105
0.9101
0.0351
15
0.8863
0.8835
0.8853
646→368/
646→105
0.3058
0.0171
15
0.3150
0.3105
0.2972
of the partner, it was confirmed that the man had been
poisoned by means of aconitine.
The cause of death in aconitine poisoning is mainly
attributed to ventricular arrhythmias [4, 8, 24]. As the
cardiopulmonary system steadily fails, death occurs due to
asphyxia, and therefore, possible postmortem signs point to
the latter, even though these are nonspecific [21]. In the
fatal case reported by Kämpf, generalised congestion of the
organs (spleen, kidneys, gastro-intestinal tract and liver)
and edema of the brain and lungs were noticed; these
findings were confirmed by microscopical examination
[21]. Maresch and Udermann reported another lethal case:
the body showed cyanosis of the lips, petechial haemorrhages on the inside of the eyelids, pulmonary congestion
and congestion of the spleen and kidneys, which was
microscopically confirmed [26]. These literature data are in
full accordance with our autopsy findings. In two other
fatalities, the autopsy findings were not detailed but
described as unremarkable [15, 17].
At first, the signs of asphyxia in our case were
completely attributed to strangulation. The wife dragged
her husband up the staircase using ropes around his neck
and chest, in the conviction that he had passed away (see
Fig. 2). Moreover, the presence of the numerous ecchymoses and abrasions on the body indicated that the man was
still alive, although probably in a comatous or agonal state
during these actions. On the other hand, the huge
congestion of the tissues could have provoked postmortem
bruises and even ‘vital-like’ strangulation signs [32]. Therefore, we can assume that the combination of aconitine
poisoning and possibly ligature strangulation has contributed
to the victim’s death.
Elliott reported a fatal suicide case with Aconitum
napellus extract. The concentrations of aconitine in blood
and urine were measured by HPLC-DAD (high performance liquid chromatography with diode array detection)
and were 10.8 and 264 ng/ml, respectively [13]. At high
concentrations, aconitine may be detectable during routine
screening by HPLC-DAD [13]; however, in our case, this
was not possible. HPLC has drawbacks for detection in
poisoned victims, such as incomplete resolution and
imprecise determination and is often not sensitive enough
to determine Aconitum alkaloids in body fluids [19, 27]. In
a more elaborate toxicological analysis, 5 years after the
event, aconitine was detected in the urine (810 ng/ml), in
the liver (6.5 ng/g) and in the kidneys (1.3 ng/g) by means
of LC-MS-MS. The value of LC-MS-MS as an important
tool to diagnose intoxications with plant material has
recently been proven, e.g., in a case of oleander poisoning
[31] and to demonstrate taxine B [18]. According to the
available literature data, aconitine alkaloids have a relatively short half-life [28, 41]. In the case of Mizugaki et al.,
aconitine was detectable in the serum only within 24 h after
intake [28]. On the other hand, the concentration was
higher in urine than in serum, and aconitine was still
detectable in the urine even 6 days after the intoxication
[28]. These findings indicate a substantial urinary excretion
of the substance, and therefore, urine is a useful matrix for
identifying the toxicants in aconite poisoning.
Ito et al. reported a suicide by means of aconite ingestion
in which GC-MS/SIM was used to quantify the aconitum
alkaloids [20]. Although jesaconitine was the main alkaloid
found in this case, aconitine itself was also detected. The
concentrations of aconite in blood, urine, right and left
lobes of the liver and kidneys were low (1.1 and 3.3 ng/ml
and 4.3, 4.2 and 2.8 ng/g, respectively) reflecting the higher
content of jesaconitine in Aconitum species in Hokkaido
where the suicide took place [20]. Aconitum alkaloids were
found in much higher concentrations in the liver and in the
kidney than in the serum [20].
In our case, the victim survived less than 24 h after
ingestion of the Aconitum extract. However, we can assume
that aconitine would still have been detectable in blood, but
regret that we were unable to report a blood level because the
whole blood sample was used up during the first routine
toxicological analyses. Although in our case, the qualified
levels in urine, kidneys and liver are an appropriate proof.
The toxicological analyses could not demonstrate the presence of triazolam in any of the samples. However, it cannot
be excluded that the woman did not tell the whole truth, e.g.,
about adding triazolam tablets to the bottle of wine.
In summary, we present a peculiar homicide in which
aconitine poisoning was involved. The intricate case was
elucidated after a delay of about 5 years. It should be
emphasised that the police inquiry in connection with
criminalistics on the one hand and the forensic pathologists
and toxicologists on the other hand should be in close
collaboration when drawing a conclusion. Finally, it should
be kept in mind that exceptional herbal intoxication should
not be overlooked, and indeed, can take an interesting and
unexpected turn in the investigation. In this case, initial
Int J Legal Med (2007) 121:214–219
strangulation and kicking turned out to be an unusual
poisoning and perimortem dragging.
Acknowledgments The authors gratefully thank Mr. Ben Claes and
Mr. Peter Clauwaert of the Belgian Federal Police (Department of
Technical and Scientific Police-Forensic Facial Imaging) for the
drawing presented in Fig. 2. The authors would also like to thank
Mr. Etienne Vandeventer for the pictures presented in Fig. 1. Finally,
the authors render thanks to Mrs. Thérèse De Vuyst and Mrs. Isabelle
Cornelis for their assistance in preparing the manuscript.
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