15 research outputs found
Application of microextraction by packed sorbent to isolation of psychotropic drugs from human serum
A method of microextraction by packed sorbent (MEPS) followed by liquid chromatography with diode array detection has been developed and optimized for the extraction of six tricyclic antidepressants (amitriptyline, nortriptyline, imipramine, desipramine, doxepin, nordoxepin) from human serum. The optimal parameters of MEPS extraction (type of sorbent, volume of sample, composition, and volume of washing and elution solutions) for these drugs in spiked samples were defined. The developed MEPS procedure was validated and then successfully applied to the analysis of serum reference material. The limit of detection (0.02–0.05 μg/mL), intraday (2.7–8.8%) and interday (4.4–11.6%) precision (RSD), and the accuracy of the assay (94.5–108.8%) at three concentration levels—0.2, 0.5, and 0.8 μg/mL—were estimated. The accuracy of the method was evaluated by the analysis of certified reference material. Moreover, the validated procedure was compared with the solid-phase extraction technique. Finally, microextraction by packed sorbent was assessed as a suitable tool in forensic and clinical methods for serum sample preparations
The 42nd Symposium Chromatographic Methods of Investigating Organic Compounds : Book of abstracts
The 42nd Symposium Chromatographic Methods of Investigating Organic Compounds : Book of abstracts. June 4-7, 2019, Szczyrk, Polan
Development of microextraction by packed sorbent for toxicological analysis of tricyclic antidepressant drugs in human oral fluid
The
aim
of
this
study
was
to
apply
microextraction
by
packed
sorbent
(MEPS)
to
the
isolation
of
six
tricyclic
antidepressants
(TCADs):
nordoxepin,
doxepin,
desipramine,
nortriptyline,
imipramine,
and
amitripty-
line
from
human
oral
fluid.
Samples
were
collected
from
healthy
volunteers
via
free
spillage
from
the
oral
cavity
to
disposable
test
tubes.
A
method
of
oral
fluid
sample
pretreatment
was
developed
and
optimized
in
terms
of
suitability
for
MEPS
extraction
and
removing
of
interfering
agents
(protein,
food
debris,
or
air
bubbles).
Moreover,
it
was
short
and
simple
to
perform
with
limited
sample
consumption
(150
L).
Extracts
were
analysed
by
UHPLC–MS.
The
MEPS/UHPLC–MS
method
was
validated
at
three
concentration
levels
(2.00,
4.00
and
8.00
ng/mL)
of
all
analytes
in
the
range
1.25–10.0
ng/mL.
The
follow-
ing
parameters
were
determined:
limit
of
detection,
limit
of
quantification,
precision,
and
accuracy.
For
all
tested
concentration
levels,
the
intra-
and
inter-day
repeatability
did
not
exceeded
8.1%
and
12.2%,
respectively.
Gained
LOQ
value,
0.50
ng/mL,
made
the
MEPS/UHPLC–MS
method
to
be
a
useful
tool
in
clinical
and
forensic
laboratories,
which
was
demonstrated
on
the
basis
of
analysis
of
real
samples
Electrochemical sensor for determination of desipramine in biological material
AbstractA simple electrochemical method for determination of desipramine in human oral fluid was developed. Two types of electrodes, namely: glassy carbon electrode (GCE) and screen-printed electrode (SPE) were tested with different electrochemical techniques: cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The simplex method was applied to find optimal instrumental conditions of DPV measurements. Three parameters were subjected to optimization with the simplex method procedure, namely potential of the pulse (Ep), potential difference between pulses (Es) and pulse time (tp). Buffer solution pH and material of the working electrode were tested in a pre-optimization step. For optimal working conditions of a given screen-printed electrode two ranges of desipramine concentration were tested. Signals registered for desipramine within the range of 0.01-1μM enabled its determination in alternative biological material such as saliva