Simultaneous Determination of Fexofenadine
Hydrochloride and Montelukast Sodium Using New
Pencil Graphite Electrode in Their Pure, Synthetic
Mixtures, and Combined Dosage Form
Dania Nashed ( Dania.nashed92@gmail.com )
University of Aleppo Faculty of Pharmacy https://orcid.org/0000-0003-0029-8153
Imad Noureldin
University of Aleppo- faculty of pharmacy
Amir Alhaj Sakur
University of Aleppo- faculty of pharmacy
Research article
Keywords: Graphite sensors, potentiometric, fexofenadine hydrochloride, montelukast sodium, molybdate
ammonium, cobalt nitrate
DOI: https://doi.org/10.21203/rs.3.rs-50184/v1
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Read Full License
Page 1/20
Abstract
This paper introduces a new electrochemical approach for the concomitant determination of
fexofenadine hydrochloride and montelukast sodium by constructing three new graphite electrodes
coated with a polymeric membrane. The rst electrode was constructed using ammonium molybdate
reagent as an ion pair with fexofenadine cation for the determination of fexofenadine drug, the second
electrode was constructed using cobalt nitrate as an ion pair with montelukast anion for the
determination of montelukast drug, the third electrode was prepared by incorporating the two previously
mention ion pairs in the same graphite sensor, which make this sensor sensitive to each fexofenadine
and montelukast drug. The coating material was a polymeric lm comprises of Poly Vinyl Chloride (PVC),
Di-butyl phthalate as a plasticizer (DBP), ion pairs of drugs with previously mentioned reagents. The
electrodes showed a Nernstian response with a mean calibration graph slopes of [58.97, 28.43, (59.048 ,
28,643 )] mv.decade-1 for the three pencil electrodes respectively. The electrodes work effectively over pH
range (2-4.5) for fexofenadine hydrochloride and (5-9.5) for montelukast sodium. The in uence of the
proposed interfering species was negligible. The effectiveness of the electrodes continued in a period of
time (45-69) days. The suggested sensors demonstrated useful analytical features for the determination
of both drugs in bulk powder, in laboratory prepared mixtures and their combined dosage form. We have
validated the method in accordance with ICH protocol.
1. Introduction
Fexofenadine hydrochloride (FEX.HCl) gure (1, a), is a selective antagonist for histamine H1- receptor, it
is an effective metabolite of terfenadine. Its chemical name is (RS)2-[4 [1-Hydroxy-4[4-(hydroxy-diphenylmethyl)-piperidyl]butyl]phenyl]-2-methylpropanoic acid(1), fexofenadine described as a second or thirdgeneration antihistamine, on 25 February 2000 FDA approved the utilization of fexofenadine for the
handling of periodical allergic rhinitis and chronic urticaria. It restrains the exacerbation of coryza and
urticaria and reduces the stringency of the signs associated with those conditions such as sneezing,
runny nose, irritating eyes(2). Montelukast Sodium (MON.Na) gure(1,b), is chemically 1-[[[(R)-m-[(E)-2-(7chloro-2-quinolyl) vinyl]--[o-(1-hydroxy-1-methyl ethyl) phenethyl] benzyl]thio]methyl]cyclopropaneacetate(3), (MON.Na) is an antagonist of cysteinyl leukotriene receptor, on
20/2/1998 FDA approved the utilization of MON for chronic handling of asthma, preventing airway
edema, smooth muscle contraction and enhanced secretion of thick, viscous mucus(4). Literature
showed several analytical methods for the estimation of each drug individually, Fexofenadine HCl was
estimated individually by some analytical methods such as HPLC (5–7)– HPTLC(8)- spectrophotometric
(9–12) - uorimetry(13) – capillary electrophoresis(14) – potentiometry(15). Similarly, montelukast
sodium (MON.Na) was determined using some analytical techniques such as HPLC(16–18), UV
spectrophotometric (19)(16), capillary electrophoresis(20), Potentiometric (21, 22), and voltammetric (23).
The combination remedy of fexofenadine with montelukast sodium supply enhancing effect thereby
reducing the symptoms e caciously(24), the determination of these drugs as combined dosage forms
was limited by a few methods like HPLC (25–27), HPTLC (28) and derivative spectrophotometric
Page 2/20
methods(29)(30).There was no previous electrochemical method for the determination of fexofenadine
HCl combined with montelukast Na. The novelty in this presented work that we have created a new,
accurate, sensitive, time and cost-saving potentiometric method for determination of fexofenadine HCl
and montelukast sodium simultaneously using pencil graphite electrodes depending on the difference in
the active pH range for each sensor. Pencil graphite electrodes consider a developed form of ion-selective
electrodes. The advantages of these electrodes are the small size where we can use them in biological
systems, their rst response time, long lifetime compared to those traditional ion-selective electrodes(31),
in addition to the advantages have known for the ion-selective electrodes such as being simple, accurate,
economic, and saving time where there is no need for previous procedures to the sample(32–36). We
have successfully applied this method for the determination of the combined dosage form without
previous separation and that was our scienti c challenge.
(a)
(b)
Figure 1: Chemical structure of (a) fexofenadine hydrochloride (b) Montelukast sodium
fexofenadine act as a cation in that it makes up an ion pair with Molybdate anion, but montelukast act as
anion and makes up ion pair with the cationic reagent cobalt nitrate, therefore we can determine each
drug separately without interference of the other drug potential. The determination of fexofenadine
hydrochloride and montelukast sodium in this presented work relies upon the construction of a pencil
graphite electrode coated with a polymer lm, which consists of polymer, plasticizer and ion pair of
previous mention drugs and reagents. The ion pairs consider the active part in the electrode, the role of
polymer is to provide a mechanical support to other components of membrane lm, which covered the
graphite rod, and the plasticizer gives an appropriate pliancy of the coating lm. Among various types of
ion-selective electrodes, pencil graphite electrode shows good adsorption, conductivity, high sensitivity,
small background current, and simple preparation(37). These electrodes carry on as interface. Thus, the
membrane potential in the cell sees as the electric potential difference between the two interfaces in
accordance with Nernstian equation
E = E0 + 2.303 = RT/ZF log [FEX]
2.1 Apparatus
Potentiometric measurements carrying out using Radiometer analytical – ion check 10 pH/mv meter
(CEDEX- France), all pH measurements were carried out utilizing Crison pH meter model Glp21/EU
(Spain), ultrasonic bath model Power Sonic 405(Korea). All weights were taken by Sartorius balance
model 2474 (Germany) its accuracy ± 0.1 mg.
2.2 materials and chemicals
Page 3/20
High pure fexofenadine hydrochloride and Montelukast sodium was obtained by Sigma Aldrich,
analytical grade ammonium molybdate, cobalt nitrate (BDH chemicals, England), high molecular weight
PVC (SABC. KSA), tetrahydrofuran solvent (MERCK 99.5%), di- butyl phthalate (MERCK 99%).
2.3 Standard drug solutions
2.3.1 FEX stock standard solution (10− 2 mol L− 1)
The FEX stock solution was prepared by dissolving accurate weight in bi-distilled water, and then the
volume was made up to the mark into a 50-mL volumetric ask.
2.3.2 MON stock solution (10− 2 mol L− 1)
The MON stock solution was prepared by dissolving accurate weight in bi-distilled water, and then the
volume was made up to the mark into a 50-mL volumetric ask.
2.3.3 working solutions
A series of working solutions their concentrations varying (1 × 10− 7 − 1 × 10− 3 mol L− 1) were prepared by
serial dilutions from the stock solutions using bi-distilled water.
2.4 procedure
2.4.1 preparation of FEX.Mol ion pair
The ion pair of fexofenadine cation with molybdate anion was prepared by mixing 1 mmol of
fexofenadine hydrochloride with 1 mmol of molybdate ammonium, an off-white precipitate was formed,
then the precipitate was ltered and washed several times by bi-distilled water. The conductivity of the
ltrate was checked to be ≤ 2 µs/cm which con rmed the disposal of all obstructive ions.
2.4.2 preparation of MON.Co ion pair
The ion pair of Montelukast anion with cobalt cation was prepared by mixing of 1 mmol of Montelukast
sodium with 2 mmol of cobalt nitrate, a pink precipitate was formed, then the precipitate was ltered and
washed several times by bi-distilled water. The conductivity of the ltrate checked to be ≤ 2 µs/cm which
con rmed the disposal of all obstructive ions.
2.4.3 Fabrication of FEX pencil graphite coated electrode
The coating solution was prepared by mixing 0.45 g PVC with 0.9 g DBP, then 0.15 g of ion Pair (FEX.Mol)
was added, all the components were dissolved in a small volume of THF. In this previous solution, a
graphite rod was immersed several times to get a homogeneous layer of the coating material on the
graphite rod. The coated graphite electrode was activated before beginning to measure the potential, by
dipping it in 10− 3 mol/l FEX solution for 24 hrs.
2.4.4 Fabrication of MON pencil graphite coated electrode
Page 4/20
The coated solution was prepared by mixing 0.6 g PVC with 1.2 g DBP, then 0.2 g of ion Pair (MON.Co)
was added, all the components were dissolved in a small volume of THF. In this previous solution, a
graphite rod was immersed several times to get a homogeneous layer of the coating material o the
graphite rod. The coated graphite electrode was activated before beginning to measure the potential, by
dipping it in 10− 3 mol/l MON solution for 24 hrs.
2.4.5 fabrication of FEX&MON pencil graphite electrode (the
combined electrode)
The preparation of this electrode was done by mixing 0.2 g of IP1 + 0.2 g of IP2 with 0.7 g PVC and 0.9 g
DBP, all the components were dissolved in a small volume of THF. In this previous solution, a graphite rod
was immersed several times to get a homogeneous layer of the coating material o the graphite rod. The
coated graphite electrode was activated before beginning to measure the potential, by dipping it in (10− 3
mol.L− 1 ) FEX and MON solutions separately for 24 hrs. in each solution.
2.4.6 Direct potentiometric determination of fexofenadine
hydrochloride
A standard series of fexofenadine hydrochloride (10− 7-10− 2) mol.l− 1 was prepared accurately and all the
potentiometric measurements carried out using (1and 3) graphite coated electrodes in junction with
Ag/AgCl reference electrode. The potential produced by the proposed electrodes was recorded for each
concentration to get the regression equations, which used to determine this drug.
2.4.7 Direct potentiometric determination of Montelukast
sodium
A standard series of Montelukast sodium (10− 7-10− 2) mol.l− 1 was prepared accurately and all the
potentiometric measurements carried out using the (2 and 3) graphite coated electrodes in junction with
Ag/AgCl reference electrode. The potential produced by the proposed electrodes was recorded for each
concentration to get the regression equations, which used to determine this drug.
2.4.8 Effect of pH
The effect of pH on the potential response of the two sensors was studied over the pH ranges of (2–6)
for fexofenadine and (3–11) for montelukast. This was obtained by adding diluted aliquots of (0.1 mol
L− 1 ) hydrochloric acid or sodium hydroxide solutions to the (1.00 × 10− 3 and 1.00 × 10− 4) mol L− 1 drug
solutions. The potential obtained at each pH value was recorded.
2.4.9 selectivity of the electrodes
The sensitivity of the constructed sensors was studied in the presence of some obstructive ions and
excipients, which may exist with the drug material. The selectivity was studied using the matched
potential method. In this method, the selectivity coe cient is characterized as the activity ratio of the
essential and the interfering ion that exhibits the equal potential change(38).
Page 5/20
K= ( α'A- αA) / αB
Where; K is the selectivity coe cient, α'A is the activity of the primary ion, αA is the xed activity of the
primary ion, αB is the activity of interfering ion.
2.4.10 determination of FEX and MON in laboratory
prepared mixtures
Different ratio mixtures of FEX and MON solutions were prepared, for that, different volumes of the stocks
solutions for both drugs were mixed to get a speci c concentration of each drug which must be within the
linearity range. Each drug was determined using its proposed sensor in the presence of the other drug,
depends on the effective pH range for each electrode.
1. 2.4.11 Preparation of test solutions
1. a. the determination of FEX.HCl in its pharmaceutical dosage form
For the determination of FEX.HCl in its pharmaceutical dosage form as a single drug. 20 tablets of
Fexofenadine drug were nely powdered; exact weight proportionate to one tablet was taken, dissolved
with bi-distilled water, and sonicate the solution in the ultrasonic bath for 5 minutes. Then the solution
was ltered, an appropriate volume was taken from the ltrate and diluted with bi-distilled water in a
25 ml volumetric ask to get 10− 4 mol.l− 1 of drug solution.
b. the determination of MON.Na in its pharmaceutical dosage form
For the determination of MON.Na in its pharmaceutical dosage form as a single drug, 20 tablets of
Azmalir drug were nely powdered; exact weight proportionate to one tablet was taken, dissolved with bidistilled water, and sonicate the solution in the ultrasonic bath for 15 minutes. Then the solution was
ltered, an appropriate volume was taken from the ltrate and diluted with bi-distilled water in a 25 ml
volumetric ask to get 10− 4 mol.l− 1 of drug solution.
c. The determination of FEX& MON as a combination form
According to the common combination ratio of FEX&MON formulation, the binary mixture was prepared
in ratio 12:1. precisely weighed (120 mg) FEX and (10 mg) MON then, common excipients that are used in
the tablet formulation were added, the mixture was transferred to a 50 ml volumetric ask and diluted to
the mark by bi-distilled water. For 20 minutes the solution was sonicated and ltered. From the ltrate,
10 ml was taken and diluted to 25 ml in volumetric ask by bi-distilled water to get the sample solution.
3. Results And Discussion
3.1. Calibration of the electrodes
Page 6/20
The constructed electrodes were dunked into a standard series solution of each drug; their concentration
ranging (10− 7 – 10− 1) mol.l− 1, the potential of each solution was recorded, then a calibration graphs were
plotted between the potential and the minus logarithm of drug concentration as shown in gure (2) and
(3). The validations rules were applied according to ICH recommendations and the results are shown in
table (1). The sensors showed to be active for 69 days for FEX.Mol, and 45 days for MON.Co sensor,
during these days the slope of the regression equation was measured and found to be almost stable, but
after this duration the slope was decreased obviously.
Table 1
Response characteristics and the validation data of the constructed sensors
Figure 2: Potentiometric pro le of FEX.Mol
sensor
parameter
Figure 3: Potentiometric pro le of MON.Co
sensor
FEX.Mol
MON.Co
The Combined sensor
FEX
MON
Slope ± SD (mV.decade− 1)
-59.227 ± 0.05
28.43 ± 0.09
-59.048 ± 0.7
28.643 ± 0.22
Intercept (mV)
435.11
-45.628
439.19
-44.342
Correlation coe cient
0.9991
0.9998
0.9999
0.9998
Response time (seconds)
20
27
29
32
pH range
(2-4.5)
(5-9.5)
(2-4.5)
(5-9.5)
Linearity range (mol.l− 1)
(10− 2-10− 5)
(10− 2-10− 5)
(10− 2-10− 5)
(10− 2-10− 5)
Life time (days)
69
45
45
Recovery a %
99.84 ± 0.51
100.92 ± 0.21
99.76 ± 0.50
100.55 ± 0.71
Repeatability b
1.59
1.18
1.70
1.63
Reproducibility c
1.73
0.29
1.91
1.99
Lodd (µM)
0.014
0.021
0.025
0.019
Loq (µM)
0.043
0.063
0.076
0.059
1. a. Average of three determinations.
2. b. Repeatability: the intraday precision (n = 3 × 3), average of three concentrations (5*10− 5, 5*10− 4
and 5*10− 3 mol.l− 1) were repeated three times within the day.
3. c. Intermediate precision: the interday precision (n = 3 × 3), average of three concentrations
(5*10− 5, 5*10− 4 and 5*10− 3 mol.l− 1) were repeated three times on two consecutive days.
Page 7/20
d. Lod 3.3 SD of intercept/ slope, LOQ = 10*SD/ slope
3.2 Effect of pH
The effect of pH on the measured potential was studied. For that, different fexofenadine solutions their
pH values range (2–6) were prepared, the potential was measured for each solution using FEX.Mol
graphite sensor, we found that the potential stay stable between pH range (2.5–4.5), at pH value more
than 4.5 a noticed decrease in potential was found. For MON.Co sensor, different Montelukast solutions
their pH values range (3–11) were prepared, and the potential was measured for each solution using
MON.Co sensor, the effective pH range was found to be (5-9.5), at pH values less than 5, Montelukast
drug participated, and more than 9.5 there was a decrease in the measured potential. It was found that
there is no requirement for using any buffer, as buffers may involve some obtrusive substances, and
because of the wide range of pH for both sensors (I and II). The obtained results are shown in gures (4)
and (5).
Figure 4: Effect of pH on potentiometric response
for FEX.Mol sensor
Figure 5: Effect of pH on potentiometric response
for MON.co sensor
3.3 selectivity of the constructed electrodes
The potential response of the proposed sensors in the presence of several related substances was
studied, and the potentiometric selectivity coe cients were calculated to estimate the selectivity of the
electrodes towards the primary drug ion (FEX) in case of sensor I and (MON) in case of sensor II, in the
presence of the other drug ion and some obstructive ions which may exist in the drug solution. As shown
in table (2), the constructed electrodes exhibit a good selectivity in the presence of the other drug which
con rms the ability of determination of each drug in the combination dosage forms.
Page 8/20
Table 2
Selectivity coe cients of the coated graphite constructed sensors
Interfering B
Sensor 1 (FEX.mol)
Sensor 2 (MON. co)
The combined sensor
FEX
MON
K Fex,B
K Mon,B
K Fex,B
K Mon,B
CaCl2
4.88*10 − 3
3.2*10 − 2
4.93*10 − 3
3.4*10 − 2
KCl
1.32*10 − 3
4.6*10 − 3
1.67*10 − 3
4.6*10 − 3
NH4Cl
6.07*10 − 3
2.1*10 − 2
6.78*10 − 3
2.3*10 − 2
NaCl
1.34*10 − 3
3*10 − 3
1.53*10 − 3
3.5*10 − 3
dextrose
7.4*10 − 3
6.1*10 − 3
7.66*10 − 3
6.4*10 − 3
Mg stearate
2.4*10 − 3
8.7*10 − 3
2.67*10 − 3
8.9*10 − 3
Avicel
6.5*10 − 3
5.5*10 − 3
6.72*10 − 3
5.6*10 − 3
FEX
……
3.8*10 − 3
……
4.2*10 − 3
MON
5.5*10 − 2
……
5.61*10 − 2
……
3.4. Potentiometric determination of laboratory prepared
mixtures containing different ratios of FEX and MON
The potential of the laboratory prepared mixtures containing different ratios of FEX and MON was
measured, and the results showed that the proposed sensors FEX.Mol and the combined sensor can be
effectively used for selective determination of FEX in the presence of MON, and the proposed sensor
MON.Co and the combined sensor can be successfully used for selective determination of MON in the
existence of FEX without a need for any previous separation, just we need to adjust the pH of each
solution within the effective pH range for each electrode. The results are summarized in Table (3).
Page 9/20
Table 3
Potentiometric determination of laboratory prepared mixtures containing
various ratios of FEX and MON
Ratio
FEX
Recovery %
MON
FEX
MON
Sensor 1
Sensor 3
Sensor 2
Sensor 3
1
1
98.40
98.22
99.31
98.89
5
1
97.27
97.13
99.97
99.20
10
1
100.92
100.52
101.62
101.12
12
1
101.16
100.99
98.40
98.14
1
12
97.72
97.56
97.58
97.33
99.09 ± 1.82
98.88 ± 1.76
99 ± 1.84
98.94 ± 1.42
Mean ± SD
3.5. Potentiometric determination of the sample solution
The prepared sensors in conjunction with the double junction Ag/AgCl reference electrode were soaked
separately in the sample solution after the adjusting of pH value of the sample solution within the
effective pH range of each electrode. The resulting potential was recorded, the corresponding
concentration was calculated from the regression equations for each sensor. We have successfully
determined each of fexofenadine and Montelukast drugs in their combination form without any need for
any previous separation. The excipients which were added, found to be don’t in uence on the potential
response, that approves the ability of the developed method for the determination of fexofenadine and
montelukast in their binary dosage form. The results realized were compared with the results obtained by
reference UV spectroscopic methods(9)(39), the statistical tests show that there is no signi cant
difference in the results was found by applying the two methods as shown in the table (4)
Page 10/20
Table 4
Determination of FEX and MON in pharmaceutical preparations using the proposed method and
reference methods.
Commercial
Name
Composition
Amount found,
mga
R%±SD
tvalueb
Fvaluec
Fexofenadine
Fexofenadine
120 mg
119.37
99.47 ± 1.16
1.06
3.53
Azmalir
Montelukast 10 mg
----
----
----
----
Combination
form
Fexofenadine
120 mg
119.27
99.39 ± 0.87
1.96
3.39
Montelukast 10 mg
----
----
----
----
Fexofenadine
Fexofenadine
120 mg
----
----
----
----
Azmalir
Montelukast 10 mg
10.05
100.5 ± 1.74
4.07
1.66
Combination
form
Fexofenadine
120 mg
----
----
----
----
Montelukast 10 mg
9.97
99.71 ± 1.61
2.82
3.20
Fexofenadine
Fexofenadine
120 mg
119.53
100.39 ±
0.78
2.26
3.46
Azmalir
Montelukast 10 mg
10.12
98.80 ± 1.20
2.77
1.77
Combination
form
Fexofenadine
120 mg
120.83
100.69 ±
0.69
2.13
2.95
Montelukast 10 mg
9.89
98.88 ± 1.34
2.22
3.30
Sensor 1
FEX.Mol
Sensor 2
MON.Co
Sensor 3
FEX.MOl + MON.Co
a: average of 3 replicates
b: t critical 4.302 (0.05)
c: f critical 19 (0.05), n = 3
4. Conclusion
Page 11/20
This research was the rst electrochemical method for the simultaneous determination of fexofenadine
hydrochloride and montelukast sodium. The results showed that the constructed method was accurate,
precise and sensitive for the determination of each drug as pure form, laboratory prepared mixtures, and
pharmaceutical formulation without any separation steps. Based on the results, it can be concluded that
the coated graphite electrodes offered a simple, rapid, eco-friendly, high sensitivity and selectivity
alternative method for the simultaneous determination of drugs, so we suggest using this type of
electrode in drug analysis.
Abbreviations
FEX
fexofenadine hydrochloride
MON
montelukast sodium
Mol
ammonium molybdate
Co
cobalt nitrate
ICH
The International Council for Harmonization of Technical Requirements for Pharmaceuticals for Human
Use
PVC
poly venyl chloride
DBP
di-butyl phthalate
THF
tetrahydrofuran
Declarations
Ethic approval and consent to participate
Not applicable
Consent for publication
Not applicable
Availability of data and materials
The datasets used and analysed during the current study are available from the corresponding author on
reasonable request
Page 12/20
Competing interests
The authors declare that they have no competing interests
Funding
This research did not receive any speci c grant from funding agencies in the public, commercial, or notfor-pro t sectors.
Authors’ contributions
A.A. Sakur: conceived and designed the experiments.
1. Nashed: performed the experiments and wrote the paper.
2. Noureldin: analyzed and interpreted the data.
All authors read and approved the nal manuscript
Acknowledgements
Not applicable.
References
1. The United States Pharmacopiea. In: USP 29-NF. United States Pharmacopieal Convention INC; 2008.
p. 1208.
2. K.Simpson, B.Jarvis. Fexofenadine: a review of its use in the management of seasonal allergic
rhinitis and chronic idiopathic urticaria. Drugs. 2000;59(2):301–21.
3. The United States Pharmacopiea. In: USP38-NF33 ed. United States Pharmacopieal Convention INC;
2015. p. 4444.
4. sweetman SC. MARTINDALE: the complete drug reference. In: 37th ed. PHARMACEUTICAL PRESS;
2011. p. 1240.
5. Nimje HM, Nimje ST, Oswal RJ, Bhamre ST. Stability indicating RP-HPLC method for estimation of
fexofenadine hydrochloride in pharmaceutical formulation. E-Journal Chem. 2012;9(3):1257–65.
6. Ibrahim F, Sharaf El- Din MK, Eid MI, Wahba MEK. Validated stability indicating liquid
chromatographic determination of ebastine in pharmaceuticals after pre column derivatization:
Application to tablets and content uniformity testing. Chem Cent J. 2011;5(1):2377–80.
7. Rele R V. Determination of Fexofenadine Hydrochloride in Pharmaceutical Dosage Form By Reverse
Phase High Performance Liquid Chromatography Method. Der Pharma Chem. 2016;8(6):224–8.
8. Solairaj P, Bhat AR, Kini SG, Raghavan G, Venkatraman R. HPTLC method for the estimation of
fexofenadine HCL in tablet dosage form. Indian Drugs. 2005 Jul;42:424–7.
Page 13/20
9. Breier AR, Steppe M, Schapoval EES. Validation of UV Spectrophotometric Method for Fexofenadine
Hydrochloride in Pharmaceutical Formulations and Comparison with HPLC. Anal Lett [Internet]. 2007
Oct 1;40(12):2329–37. Available from: https://doi.org/10.1080/00032710701576023
10. Polawar P, Shivhare U, Bhusari K, Mathur V. Development and Validation of Spectrophotometric
Method of Analysis for Fexofenadine HCl. Res J Pharm Tech. 2007 Nov;1(4):539–40.
11. Narayana B, Veena K. A new method for the spectrophotometric determination of fexofenadine
hydrochloride. 2010;17(September):386–90.
12. Ashour S, Khateeb M. New Kinetic Spectrophotometric Method for Determination of Fexofenadine
Hydrochloride in Pharmaceutical Formulations. Fenniri H, editor. Int J Spectrosc [Internet].
2014;308087. Available from: https://doi.org/10.1155/2014/308087
13. Alothman Z, Bukhari N, Wabaidur S, Abdullah A, Haider S. Spectro uorimetric determination of
fexofenadine hydrochloride in pharmaceutical preparation using silver nanoparticles. Arab J Chem.
2010 Jun;3(4):251–5.
14. Mikuš P, Valášková I, Havránek E. Determination of fexofenadine in tablets by capillary
electrophoresis in free solution and in solution with cyclodextrins as analyte carriers. Drug Dev Ind
Pharm. 2005;31(8):795–801.
15. ABBAS MN, ABDEL FATTAH AA, ZAHRAN E. A Novel Membrane Sensor for Histamine H1-Receptor
Antagonist “Fexofenadine.” Anal Sci. 2005;20(8):1137–42.
16. Muralidharan S, Jia Qi L, Ting Yi L, Kaur N, Parasuraman S, Kumar J, et al. Newly Developed and
Validated Method of Montelukast Sodium Estimation in Tablet Dosage Form by Ultraviolet
Spectroscopy and Reverse Phase - High Performance Liquid Chromatography. Pharmacol Toxicol
Biomed Reports. 2016;2(2):27–30.
17. Shakya AK, Arafat TA, Hakooz NM, Abuawwad AN, Al-Hroub H, Melhim M. High-performance liquid
chromatographic determination of montelukast sodium in human plasma: Application to
bioequivalence study. Acta Chromatogr. 2014;26(3):457–72.
18. Chauhan B, Rani S, Nivsarkar M, Padh H. A new liquid-liquid extraction method for determination of
montelukast in small volume human plasma samples using HPLC with uorescence detector. Indian
J Pharm Sci. 2009;68(4):517.
19. Patel NK, Chouhan P, Paswan SK, Prakash K. Development and validation of a UV
spectrophotometric method for simultaneous estimation of combination of Montelukast sodium in
presence of Levocetirizine Dihydrochloride. Paswan [Internet]. 2014;6(3):313–21. Available from:
http://www.scholarsresearchlibrary.com/articles/development-and-validation-of-a-uvspectrophotometric-method-for-simultaneous-estimation-of-combination-of-montelukast-s.pdf
20. Shakalisava Y, Regan F. Determination of montelukast sodium by capillary electrophoresis. J Sep
Sci. 2008 Apr;31(6–7):1137–43.
21. Soudi AT, Hussein OG, Elzanfaly ES, Zaazaa HE, Abdelkawy M. Potentiometric Method to Determine
Montelukast Sodium in its Tablets with In-line Monitoring of its Dissolution Behaviour. Anal Bioanal
Electrochem. 2020;12(4):502–16.
Page 14/20
22. Aslan N, Erden. Development and validation of a potentiometric titration method for the
determination of montelukast sodium in a pharmaceutical preparation and its protonation constant.
Bulg Chem Commun. 2014;46(3):497–502.
23. Alsarra I, Al-Omar M, Gadkariem EA, Belal F. Voltammetric determination of montelukast sodium in
dosage forms and human plasma. Farmaco. 2005;60(6–7):563–7.
24. Mahatme MS, Dakhale GN, Tadke K, Hiware SK, Dudhgaonkar SD, Wankhede S. Comparison of
e cacy, safety, and cost-effectiveness of montelukast-levocetirizine and montelukast-fexofenadine
in patients of allergic rhinitis: A randomized, double-blind clinical trial. Indian J Pharmacol [Internet].
2016;48(6):649–53. Available from: https://pubmed.ncbi.nlm.nih.gov/28066101
25. Naaz A, Vani R. Simultaneous Estimation of Montelukast and Levocetirizine in Its Bulk and Liquid
Dosage Form By Rp-Hplc. 2015;5(10).
26. Pankhaniya M, Patel P, Shah JS. Stability-indicating HPLC Method for Simultaneous Determination
of Montelukast and Fexofenadine Hydrochloride. Indian J Pharm Sci [Internet]. 2013 May;75(3):284–
90. Available from: https://pubmed.ncbi.nlm.nih.gov/24082344
27. Performance H, Chromatography L, Sodium M. DEVELOPMENT OF VALIDATED HPLC METHOD FOR
SIMULTANEOUS ESTIMATION OF FEXOFENADINE. 2012;3(12):4876–81.
28. Tandulwadkar SS, More SJ, Rathore AS, Nikam AR, Sathiyanarayanan L, Mahadik KR. Method
Development and Validation for the Simultaneous Determination of Fexofenadine Hydrochloride and
Montelukast Sodium in Drug Formulation Using Normal Phase High-Performance Thin-Layer
Chromatography. ISRN Anal Chem. 2012;1–7.
29. Sowjania G, Sastri T. UV Spectrophotometric Method Development and Validation for Simultanious
Determination of Fexofenadine Hydrochloride and Montelukast Sodium in Tablets. World J Pharm
Pharm Sci. 2018 Jul 11;6(10):780–9.
30. Patle D, Nagar S. UV-visible Spectrophotometric Estimation of Montelukast and Fexofenadine by
Simultaneous Equation Method in Bulk & Combined Tablet dosage form. Curr Trends Biotechnol
Pharm. 2017 Oct;11:382.
31. R.W.Cattarall, Henry F. coated-wire ion- selective electrode. Anal Chem. 1971;43(13):1905–6.
32. Sakur AA, Nashed D, Haroun M, Noureldin I. Determination of prasugrel hydrochloride in bulk and
pharmaceutical formulation using new ion selective electrodes. Res J Pharm Technol.
2018;11(2):631–6.
33. Haroun M, Nashed D, Sakur AA. New electrochemical methods for the determination of Prasugrel
using drug selective membranes. Int J Acad Sci Res. 2017;5(3):30–6.
34. Mansour O, Nashed D, Sakur AA. Determination of Clopidogrel bisulphate Using Drug Selective
Membranes Determination of Clopidogrelbisulphate using Drug Selective Membranes. Res J Pharm
Technol. 2018;11(5):2017–21.
35. Dabbeet H, Sakur A, Noureldin I. Novel Drug Selective Sensors for Simultaneous Potentiometric
Determination of both Cipro oxacin and Metronidazole in Pure form and Pharmaceutical
Formulations. Res J Pharm Technol. 2019 Aug 27;12:3377–84.
Page 15/20
36. Sakur AA, Bassmajei S, Dabbeet HA. Novel Moxi oxacin Ion Selective Electrodes for Potentiometric
Determination of Moxi oxacin in Pure Form and Pharmaceutical Formulations. Int J Acad Sci Res.
2015;3(4):66–75.
37. Shahrokhian S, Amini M, Kolagar S, Tangestaninejad S. Coated-Graphite Electrode Based on
Poly(vinyl chloride)– Aluminum Phthalocyanine Membrane for Determination of Salicylate.
Microchem J - Microchem J. 1999 Oct 1;63:302–10.
38. Umezawa Y, Umezawa K, Sato H. Ion-Selective Electrodes : Recomended Kri. Pure Appl Chem.
1995;67(3):507–18.
39. Babu K, Srinivasa P. Validated UV Spectroscopic Method for Estimation of Montelukast Sodium from
Bulk and Tablet Formulations. Int J Adv Pharmacy, Biol Chem Res. 2012;1(4):450–3.
Figures
Figure 1
Chemical structure of (a) fexofenadine hydrochloride (b) Montelukast sodium.
Page 16/20
Figure 2
Potentiometric pro le of FEX.Mol sensor.
Page 17/20
Figure 3
Potentiometric pro le of MON.Co sensor.
Page 18/20
Figure 4
Effect of pH on potentiometric response for FEX.Mol sensor.
Page 19/20
Figure 5
Effect of pH on potentiometric response for MON.co sensor.
Page 20/20