Method Development and Validation for Simultaneous Estimation of Dasatinib and Erlotinib by Using RP HPLC in Pharmaceutical Dosage Form

International Journal of Trend in Scientific Research and Development (IJTSRD)
Volume 5 Issue 3, March-April 2021 Available Online: www.ijtsrd.com e-ISSN: 2456 – 6470
@ IJTSRD | Unique Paper ID – IJTSRD41117 | Volume – 5 | Issue – 3 | March-April 2021 Page 1128
Method Development and Validation for Simultaneous
Estimation of Dasatinib and Erlotinib by Using
RP-HPLC in Pharmaceutical Dosage Form
Dara. Varun3, Kumaraswamy. Gandla1, R. Lalitha2, M. Muralikrishna3
1Care College of Pharmacy, Oglapur (Vill), Damera, (Mdl), Warangal-Rural, Telangana, India
2Chaitanya College of Pharmacy Education and Research, Hanamkonda, Warangal, Telangana, India
3Research Scholar, Career Point University, Kota, Rajasthan, India
ABSTRACT
The present study describes a newly developed, optimized and validated
isocratic RP-HPLC method for the separation of two tyrosinekinaseinhibitors
(Dasatinib-DST and Erlotinib-ERT) with Methyl paraben-MPB as internal
standard (IS), in bulk and pharmaceutical formulations with the aid of
Chemometrics, multi criteria decision making (MCDM) approach. The
separation was achieved by using Phenomenex Enable C18 column (15×4.6
mm id, 5µm particle size) and PDA-UV-detection at 277nm.The range of
independent variables used for the optimization were MeOH: 60-70%, pH: 2-
2.5 and flow rate:0.3-0.8ml/min. The influenceoftheseindependentvariables
on the output responses: capacity factor of the first peak (k1), resolution (Rs)
and separation (α) of the second peak and retention time (tR3) were
evaluated. Using this strategy, mathematical model wasdefined,andresponse
surface were derived for the separation. The coefficients of determination R2
were more than 0.9258 for all the models. The four responses were
simultaneously optimized by using Derringer's desirability functions and
MCDM approach. Optimum conditions chosen for assay were MeOH, 0.01mM
KH2PO4 (pH 2.5±0.5) adjusted with diluted orthophosphoric acid solution
(68.03:31.97v/v) and flow rate of 0.8 mL/min. Peak area ratio of the analyte
and internal standard was used for the quantification of pharmaceutical
formulation samples. Total chromatographic analysis time per sample was
approximately 9.0 min with DST, MPB (IS) and ERT eluting with retention
times of 2.7, 3.2, and 6.0 minutes respectively. The optimized assay condition
was validated as per ICH guidelines and applied for the quantitative analysis
Sprycel-DST tablet and Tarceva -ERT capsule.
KEYWORDS: Multi Criteria Decision Making Approach, Derringer’ desirability
function, Tyrosine Kinase Inhibitors, RP- HPLC, Dasatinib and Erlotinib
How to cite this paper: Dara. Varun |
Kumaraswamy. Gandla | R. Lalitha | M.
Muralikrishna "Method Developmentand
Validation for Simultaneous Estimationof
Dasatinib and Erlotinib byUsingRP-HPLC
in Pharmaceutical Dosage Form"
Published in
International Journal
of Trend in Scientific
Research and
Development(ijtsrd),
ISSN: 2456-6470,
Volume-5 | Issue-3,
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INTRODUCTION
The deregulation ofproteinkinasehasbeenidentifiedtoplay
a key role in the molecular pathogenesis of human cancers,
such as chronic myelogenous leukemia and also in solid
tumors1. In Chronic myeloid leukemia(CML)tyrosinekinase
receptors are proteins playing an important role in the
transduction of the signals involved in growth of cells2. CML
is amyeloproliferativedisordercharacterizedbythepresence
of the Philadelphia chromosome, a consequence of a
reciprocal translocationbetweenthearmsofchromosomes9
and 22, producing a fusion oncogene referred to as BCR-ABL
(Break pointcluster region-Abelsonprotooncogene3,4.This
BCR-ABL kinase is responsible for the activation of signal
transduction cascadesandconsequentlyforuncontrolledcell
proliferation, apoptosis and adhesion5.The first generation
drug used for the treatment of CML is imatinib. The failure of
imatinib most likely arises from a combination of tumor and
host related factors that contribute to pharmacokinetic
variability and induction of resistance6. Dasatinib and
Nilotinb has revolutionized the treatment ofchronicmyeloid
leukemia and tumors. These drugs are second generation,
approximately more potent than imatinib and it also inhibits
a number of imatinib-resistant mutant proteins7.
Dasatinib (DST),chemicallyN-(2-chloro-6-methylphenyl)-2-
[[6-[4-(2-hydroxyethyl)-1-piperazinyl]-2-methyl-4-
pyrimidinyl]amino]-5-thiazolecarboxamidemonohydrateas
shown in (Figure 1). Dasatinib is a white to off-white
powder.
The solubility of drug substance is slightly soluble in ethanol,
methanol,and polyethyleneglycolandveryslightlysolublein
acetone, acetonitrile and practically insoluble in corn oil. Is a
potent oralinhibitorofmultipleoncogenickinases8.Erlotinib
(ERT), chemically N-(3-ethynylphenyl)-6, 7-bis(2-
methoxyethoxy) quinazolin-4-amine as shown in (Figure 2).
Erlotinib is a white to slightly yellowish to greenish yellow
powder. Erlotinib is solubleinorganicsolventssuchasDMSO
and dimethyl form amide (DMF), sparingly soluble in
aqueous solutions. To enhance aqueous solubility, dilute the
organic solvent solution into aqueous buffers and isotonic
IJTSRD41117

International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470
saline. Erlotinib is second generation tyrosine kinase
inhibitor that is reported to have been used in targeted
therapy for cancer 9-10. Literature review ravels that some
analytical methods have been reported for Dasatinib 11-13
and Erlotinib 14-16 individually asstability indicating and in
biological fluids or in combination with other drugs in
pharmaceutical dosage forms. Recently HPLC, HPTLC and
HPLC-MS 17-20 has been reported for the simultaneous
determination of Dasatinib and Erlotinib in pharmaceutical
dosage formsand biologicalfluidswhichareeithertediousor
expensive methods.
To the best of our knowledge, currently there is no HPLC
method employing optimization techniques using MCDM
approach have been reported for the simultaneous
estimation of DST and ERT. Therefore, the simultaneous
determination of these analytes becomes encouraging and
important. Developing and optimizing an isocratic HPLC
21,22 method is a complex procedure that requires
simultaneous estimation ofseveral factors, viz., the typeand
composition of the organic phase, flow rate, pH, type of
stationary phase, column temperature, etc. For decades
HPLC separation were based on a trial and error
methodology, but employing a time-consuming trial-and-
error approach resulting only in an apparent optimum and
information concerning the sensitivity of the factors on the
analytes separation and interaction between factors is not
available. To achieve this objective any one of the
Chemometrics methods which includes the overlapping
resolution maps 23 MCDM. factorial design 24 and response
surface methodology25-32 can be applied. The best
experimental design approach for the purpose of modeling
and optimization are the response surface design.
MATERIALS AND METHODS
Apparatus
Chromatographic measurements were made on a UFLC
Shimadzu (Tokyo, Japan) model which consisted of a LC-
20AD solvent delivery module, SPD-m20Aprominencediode
array detector, a Rheodyne injector (model 7125, USA)valve
fitted with a 20µl loop. The system was controlled through a
system controller(SCL-10A)andapersonalcomputerusinga
Shimadzu chromatographicsoftware(LCSolution,Release1-
11SP1) installed on it. The mobile phase was degassed using
Branson sonicator (Branson Ultrasonic Corporation, USA).
Absorbance spectra were recordedusinganUV-doublebeam
spectrophotometer (Systronices 2202 Model UV-1601PC,
Japan) employing quartz cell of 1.00 cm of pathlength.
Software
Experimental design, data analysis and desirability function
calculations were performed by using trial of version 10 of
Design-Expert® Software. The calculations for the analysis
were performed by use of Micro soft Excel 2007 software
(Microsoft, USA).
Chemicals and reagents
Working standards of Dasatinib, Erlotinib were donated by
Hetero pharma, and Methyl paraben as shown in (Figure 3)
was donated by sunglow pharma, Puducherry, India.
Methanol [MeOH] of HPLC grade and potassium di hydrogen
orthophosphate and orthophosphoricacid was of analytical-
reagent grade supplied by M/S SD fine Chemicals, Mumbai,
India. The HPLC grade water was prepared by using Milli- Q
Academic, Millipore, and Bangalore, India. The
pharmaceuticalsSprycel-DSTtablet100mgandTarceva-ERT
capsules 200mg were donated from Hetero pharma,
Hyderabad, India.
Standard solutions
Stock standard solutions of DST, ERTandMPB(IS)(1mg/ml)
were prepared in mobile phase.Thepreparedstocksolutions
were stored at 4°C protected from light. Working standard
solutions were freshly obtained by diluting the stock
solutions with mobile phase during analysis day. Calibration
curves reporting peak area ratios of DST, ERT to that of the
MPB (IS) versus drug concentrations were established in the
range of 10-50µg/ ml in the presence of Methyl Paraben
30µg/mL as internal standard. Standard solution prepared
for the optimization procedure constituted DST, ERT and
MPB (IS) at 10.0, 10.0 and 30.0 µg/mL respectively.
Sample preparation
Weigh and powder 10 tablets of DST and transfer tablet
powder equivalent to 100mg of Dasatinib into a 200mL of
volumetric flask, add 120mL ofmobilephaseandsonicatefor
not less than 30minuteswithoccasionalshaking.Makeupthe
volume to 200mL with mobile phase and mix. Centrifuge a
portion of the above solutionat 3000 rpm for10minutesand
Filter the solution through 0.2µm membrane filter (Pall Life
Science, India). Transfer5.0mLofabovesolutionintoa25mL
volumetric flask, dilute to volumewithmobilephaseandmix.
Weigh and empty 10 capsules of ERT and transfer capsule
powder equivalent to about 100mg of Erlotinibintoa100mL
of volumetric flask, add 60mL of mobile phase and sonicate
for not lessthan30minuteswithoccasionalshaking.Makeup
the volume to 100mL with mobile phase and mix. Centrifuge
a portion of the above solution at 3000 rpm for 10 minutes
and filter the solution through 0.2µm membrane filter (Pall
Life Science, India).and discard first few mL of the filtrate.
Further transfer 5.0ml of the above solution into a 100ml
volumetric flask, dilute to volumewithmobilephaseandmix.
Chromatographic procedure
Chromatographic separation was carried out on a
Phenomenex® C18 Enable column (150mm× i.d., 5µm)
connected with a Phenomenx® C18 guard cad ridge
(4mm×3mm i.d., 5µm). The mobile phaseconsistedofMeOH:
0.01mM Potassium Dihydrogen Orthophosphate buffer (pH
2.5), adjusted with freshly prepared 10% orthophosphoric
acid. Wavelength of 277 nm was selected for detection. An
injection volume of the sample was 20µl. The HPLC system
was used in an air-conditioned laboratory at atmosphere
(20±2°c).
Validation
Validation studieswereconductedusingtheoptimizedassay
conditions based on the principles of validation described in
the ICH guidelines “Text on validation of Analytical
Procedures”33and “Q2B, Validation ofAnalytical Procedure:
Methadology”34. Key analytical parameters, including,
accuracy, precision, linearity, detection limit, quantitation
limit was evaluated.Thecalibrationcurvesweretestedusing
one-way ANOVA at 5% significance level. Calibration curves
were constructed in a low region of 10-50% of the target
analyte concentration for the limit of detection and
quantification. Also,robustness of the proposedmethodwas
assessed with respect to small alterations in the MeOH
concentration, pH, and buffer concentration

Table 1: Experimental design and results of a rotatable central composite Design a
Design points
Factor levels Responses
A % v/v B pH C mL min-1 K1 Rs 2,3 α(1,2) tR4
1 65.00 1.83 0.55 0.678 1.4975 1.398 6.8
2 70.00 2.50 0.80 0.464 2.1605 1.5925 5.8
3 70.00 2.00 0.80 0.689 0.162 1.1235 5.8
4 65.00 2.25 0.55 0.731 2.0315 1.3155 9.5
5 70.00 2.50 0.30 0.469 2.61 1.599 15.7
6 65.00 2.25 0.55 0.731 2.0315 1.355 9.5
7 65.00 2.25 0.13 0.749 2.324 1.317 42
8 60.00 2.00 0.80 1.5855 0.000 0.000 7.3
9 65.00 2.25 0.55 0.731 2.0315 1.355 9.5
10 65.00 2.25 0.97 0.743 1.553 1.309 5.6
11 60.00 2.50 0.30 1.114 0.000 0.000 31.25
12 65.00 2.25 0.55 0.731 2.0315 1.355 9.5
13 60.00 2.00 0.30 1.609 0.000 0.000 24.8
14 73.41 2.25 0.55 0.362 0.000 0.000 6.1
15 65.00 2.25 0.55 0.731 2.0315 1.355 9.5
16 65.00 2.67 0.55 0.772 0.000 0.000 15.44
17 60.00 2.50 0.80 1.3105 0.000 0.000 12.5
18 56.59 2.25 0.55 1.564 1.725 2.536 19.2
19 65.00 2.25 0.55 0.731 2.0315 1.355 9.5
20 70.00 2.00 0.30 0.4695 2.61 1.599 15.5
a Randomized
Table 2: Response modelsa and statistical parameters obtained from ANOVA for CCD
Responses Regression model
Adjusted
R2
Model P
Value
%C.V
Adequate
precision
K1
+0.73-0.40* A-0.063* B+0.026* C+0.066* AB+2.688E-
003* AC+1.937E-003* BC+0.11* A2+0.030*B2+0.037
* C2
0.8590 <0.0002 16.79 13.51
Rs(1,2)
+1.98-0.51* A-0.45* B-0.32* C+0.27* AB-0.38* AC+0.27*
BC-0.45* A2-0.49* B2+0.27*ABC+0.72* A2B+1.44* AB2
0.9649 <0.0001 14.60 18.70
α(1,2)
+1.36-0.75* A-0.42* B-2.378E-003* C+0.20* AB- 0.20*
AC+0.20* BC-0.13* A2-0.33* B2-0.11*2+0.20
* ABC+0.61* A2B-0.20* A2C+1.35* AB2+0.000 (AC2
+*B2C+ BC2+ A3+ B3+* C3)
0.7978 <0.0138 35.99 8.665
tR3
+9.77-4.03* A+1.93* B-8.57* C-1.43* AB+2.08*
AC+0.79* A2+4.73*C2
0.9441 <0.0001 16.60 23.42
a only significant coefficients with P < 0.05 are included. Factors are in coded levels.
Table 3: Criteria for the optimization of the individual responses for the analysis of quality control samples
(Criteria I)
Responses Lower limit Upper limit
Criteria I
Goal Importance weights
Bn’K1 0.362 1.609 In range 3 1
Rs(1,2) 0.000 1.751 Maximize 4 1
α(1,2) 0.000 1.287 Maximize 3 1
tR3 5.6 42 Target=6 5 5
Table 4: Comparison of observed and predictive values of different objective functions under optimal conditions
Optimum conditions MeOH(%) pH Flow (ml/min) K1 Rs(1,2) α(1,2) tR3
For Formulation
Desirability Value (D) = 0.808
68.03 2.5 0.8
Experimental value 0.56 1.81 1.39 5.84
Predicted value 0.59 1.75 1.28 6.00
Average % error 5.08 3.42 8.59 2.67

Figure 1: Dasatnib Figure 2: Erlotinib Figure 3: Methyl paraben
Figure 4a Figure 4b
Figure 4c Figure 4d
Figure 4: Perturbation plots showing the effect of each independent variables on (a) k1, (b) Rs(1,2) (c) α (1,2), (d) tR3
Where A is the MeOH concentration, B the pH buffer, C the flow rate
Figure 5a Figure 5b Figure 5c Figure 5d
Figure 5: Response surfaces related to MeOH (A) pH of buffer (B) Flow rate of mobile phase (C): (a) capacity factor
first peak (k1), (b) resolution of the critical pair Rs(1,2) (c) separation of α (1, 2) (d) retention time of the last peak
(tR3)
Figure 6: Graphical representation of the overall desirability function D (D=0.808) where MeOH Conc.(A) of 68.03,
pH of buffer (b) 2.5 and Flow rate (c) 0.8mL/min and individual desirability of the four responses and three factors.

Figure 7: Chromatograms corresponding to (A) a Placebo solution; (B) Synthetic mixture of DST 10 µg/ml), IS (30
µg/ml), ERT (10 µg/ ml); (C) a Real sample of Sprycel-DST tablet (40 µg/ml); (D) a
Real sample of Tarceva-ERT tablet (50 µg/ml)
RESULTS AND DISCUSSION
Optimization design and analysis
Before starting an optimization procedure, it is important to
investigate the curvature term using Factorial design with
center points. ANOVA generated for 2k Factorial design
shows that curvatureissignificantforalltheresponses(k1,RS
(1,2) and α (1,2), tR3) since p-value is less than 0.05. This
implies that a quadratic model and cubic models should be
considered to model the separation process. For resolution
and separation models we selected cubic and for retention
time, capacity factor we selected quadratic models. In order
to obtain second order predictive model, central composite
design (CCD) is employed, whichis a design type under RSM.
CCD is chosen due to its flexibility and can be applied to
optimize anHPLC separation gainingbetterunderstandingof
factors main and interaction effects. The selection of key
factors examined for optimization was based on preliminary
experimentsandpriorknowledgefromliterature.Thefactors
selected for optimization process were MeOH concentration
(A), pH of buffer (B) and flow rate (C). The capacity factor for
first eluted peak (k1), the resolution andseparationofsecond
peak (Rs (1, 2), α2), the retention time of last peak (tR3), was
selected as responses. In the preliminary study, resolution
between two peaks (Rs1, 2), were found to be close to 0 and
were merging, hence these two peaks were considered as
critical peaks and we included resolution and separation of
the second peak as responses for the global optimization.
Methyl paraben was used as internal standard since it
presented acceptable resolution and retention time with all
theanalytes.
All experiments were conducted in randomized order to
minimize the effects of uncontrolled variables that may
introduce a bias on the measurements. Replicates (n=6) of
the central points were performed to estimate the
experimental error. (Table 1), summarizes the conducted
experiments and responses. The quadratic and cubic
mathematical model for the independent factors is given in
Eq. (1) & (2)
Eq. (1)
Y = β0x3 + β1x2 + β2x +β3 Eq. (2)
Where Y is the response to the modeled, β is the regression
coefficient and X1, X2 and X3 represents factors A, B and C,
respectively. StatisticalparametersobtainedfromANOVAfor
the reduced models are given in (Table 2). The insignificant
terms (P > 0.05) were eliminated from the model through
backward elimination processtoobtainasimpleandrealistic
model. Since R2 always decreases whena regressor variable
iseliminatedfroma regression model, in statisticalmodeling
adjusted R2 which takes the number of regressor variables
into account is usually selected.
In the present study, the adjusted R2 were well within the
acceptable limits of R2 ≥ 0.80 which revealed that the
experimental data shows a good fit with the second- order
polynomial equations. For all the reduced models, P value of
< 0.05 is obtained, implying these models are significant. The
adequate precision value is a measure of the signal
(response) to noise(deviation)ratio”.Aratiogreaterthan4is
desirable. Inthis study, the ratio wasfound to be in the range
of 8.642 – 23.42, which indicates an adequate signal and
therefore the model is significant for the separation process.
The coefficient of variation (C.V.) is a measure of
reproducibility of the modelandasageneralruleamodelcan
be considered reasonably reproducible if it is lee than 10%.
The C.V. for all models was found to be less than 10%. The C.
V. for all the models wasfound to be less than 10% except for
α (1, 2) (35.99). Hence, the diagnostic plots, (a) normal
probability plots35 of residuals and (b) plot of residuals
versus predicted values36 were analyzed for response α (1 2).
Since the assumptions of normality and constant variance of
residuals were found to besatisfied, the fittedmodelfortheα
(1 2) was accepted.
As can be seen in (Table 2), the interaction term with the
largest absolute coefficient among the fitted models is A C (+
2.08) of tR3 model. The positive interaction between A and C
is statistically significant (<0.0001) for tR3. Thestudyreveals
that changing the fractionofMeOHfromlowtohighresultsin
a rapid decline in the retention time of DST and ERT both at
the low and high level of Ph. Further at low level of factor A,
an increase in the Ph results in a marginal decrease in the
retention time. Therefore, when the MeOHconcentrationhas
to be at its highest level to shorten the run time. Especially
this interaction is synergistic, as it leads to a decrease in run
time.
In (Figure 4) perturbation plots are presented for predicted
models in order to gain an effectof anindependentfactorona
specific response with all other factor held constant at a
reference point. A steepest slope or curvature indicates
sensitiveness of the response to a specific factor. Figure4d.
Shows that Flow rate (factor C) and MeOH (factor A) had the
most important effect on a retention time tR3 followed by pH

1 2 3
(factor B). In Figure 4 b& c. The factors (pH, MeOH
concentration & flow rate) had significant effect on Rs (1, 2)
and α (1, 2) and only one factor A had significant effect on k1.
In Figure 4a and (b), k1 and Rs1 2 values increased as the level
of MeOH concentration (factor A) decreased and Rs (1, 2)’
values increased at the level of buffer pH (factor B) and Flow
rate (factor C) are at mid-point.
Response surfaces plots for k1, Rs1 2 and α1 2 and tR3 are
illustrated in Figure 5. (% Methanol concentration is plotted
against the pH,Flow rate heldatconstantatthecentervalue).
Analysis of perturbation plots and response plots of
optimization models revealed that factor A and B had the
significant effect ona separation ofthe analytes, whereasthe
factor C i.e. the Flow rate, is of little significance.
Global optimization
In the present study the identified criteria for the
optimization were: resolution between two critical peaks,
capacity factor, separation and retention time of the last
peak. Derringers desirability function was used to optimize
three responses with different targets37. The Derringers
desirability function, D, is defined as the geometric mean,
weighted, or otherwise, of the individual desirability
functions Eq. (3). The expression that defines theDerringers
desirability function is:
Eq. (3)
Where pi is the weight of the response, n the number of
responsesand diistheindividualdesirabilityfunctionofeach
response. Desirabilityfunction(D)cantakevaluesfrom0to1.
Weightscan range from 0.1 to 10. Weights lower than1 gives
less importance to the goal, whereas weights greater than 1
gives more importance to the goal. In the present study, pi
values were set 1 for K’, Rs (1, 2) and α (1, 2) responses and
pi for tR3 was set to 5. A value of D close to 1 indicates that
the combination of thedifferentcriteriaismatchedinaglobal
optimum. In (Table 3). Criteria I have been proposed for
selecting an optimum experimental condition for analyzing
routine quality control samples. Ascan beseenundercriteria
I, the responses tR3 was targeted to 6.0 min, in order to
shorten the analysis time. On the other hand, Rs (1,2)
maximized to allow baseline separation DST and IS. In order
to separate the firstelutingpeak(DST)fromthesolventfront,
k1 was in range. Importance can range from 1 to 5, which
gives emphasis to a target value. The Importance for
retention time is 5 to reduce the time of analysis. Following
the conditions and restrictions above, the optimization
procedure was carried out. The Graphical representation as
shown in (Figure.6) of the overall desirability function D
(D=0.808) whereMeOHConc.(A)of68.03,pHofbuffer(B)2.5
and Flow rate (C) 0.8mL/min and individual desirability of
thefourresponsesand threefactors. The predicted response
values corresponding to the latter value of Dwere:k1=0.596,
Rs=1.751, α (1,2) = 1.287 and tR2= 6.0 min. The prediction
efficiency of the model was confirmed by performing the
experiment under the optimal condition and the
corresponding chromatograms is shown in (Figure. 7).
In order to investigate the predictability of the proposed
model, the agreement between experimental and predicted
responses for the predicted optimums I are shown in (Table
4). The Percentage of prediction error was calculated by Eq.
(4). The average error for k’=5.08 Rs(1, 2) =3.42 α (1, 2) =8.59
and tR3= 2.67 were respectively, indicating good correlation
between the experimental and predicted responses.
Predicted Error= Experimental- Predicted/ Predicted *100
Eq. (4)
Assay method validation
The last step of the study wasto check method validationfor
specificity, linearity, intra/inter-day precision, and
robustness. The optimized HPLC method was specific in
relation to the placebo used in the study. All placebo
chromatograms showed no interference peaks (Figure 7a).
An excellent linearity was established at five level in the
range of 10-50 µg/ml for DST&ERT and30µ g/ml of IS with
R2 of more than 0.998 for all the analytes. The slope and
intercept of the calibration curve were. 0.009 and + 0.0576
for DST and 0.053 and 0.018 ERT respectively. Since the
correlation coefficients are not good indicators of linearity
performance of an analytical procedure a one-way ANOVA
was performed. For all the analytes, the calculated F- Value
(F calc) was found to be less than the theoretical F-value (F
crit) at 5% significance level, indicating that there was no
significance difference betweenreplicatedeterminations for
each concentration level. The LODs were 56.1, 5.22 ng/mL
and LOQs were 170, 15.84ng/mL for DST and ERT
respectively. Accuracy (n=9), assessed by spike recovery,
were found to be 99.7, 97.7, for DST& ERT respectively,with
were within acceptable ranges of 100± 2%. The intra and
inter-assay precision (n=6) was confirmed since, the %CV
were well within the target criterion of ≤ 2 and ≤ 3,
respectively. Robustness study reveals that small change s
did not alter the retention times, retention factor, and
resolution and therefore it would be concluded that the
method conditions are robust.
Application of the method
As a last step, commercial product of DST-Sprycel tablet 100
mg and commercial capsules of ERT- Tarceva 200 mg were
assayed by the proposed HPLC method. Representative
chromatograms are presented in figure7. The results
achieved when analyzing DST-Sprycel tablets was 99.98
(0.42) mg of DST and when analyzing ERT-Tarceva capsules
was
199.88 (0.62) mg of ERT. Good agreement was found
between the assay results and the label claim of the product.
The %C.V. for the tabletand capsules were < 2, indicating the
precision of the analytical methodology.
CONCLUSION
An efficient isocratic reversed-phase high-performance
liquid chromatography method was developed, optimized
and validated for the simultaneous estimation of Second
generation TKI’s namely DST and ERT in bulk and
pharmaceutical formulations using Chemometrics Multi
Criteria Decision Making Approach. This method reduces
overall assay development time and provides essential
information regarding the sensitivity of various
chromatographic factors and their interaction effects onthe
attributes of separation. Time of analysis, resolution, and
quality of the peaks were simultaneously optimized by
applying useful tools of Chemometrics: central composite
design and Derringers desirability function. The validation
study supported the selection of the assay conditions by
confirming that the assay was specific, accurate, and linear,
precise, and robust. Therefore, this HPLC method can be

used as a routine quality control analysis of second
generation tyrosine kinase inhibitors.
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