Int J Pharm Pharm Sci, Vol 9, Issue 4, 78-86Original Article


VALIDATED SPECTROPHOTOMETRIC METHOD FOR THE ESTIMATION OF VINCRISTINE AND VINBLASTINE

HALAHAKOON AMILA JEEWANTHA*, SLIVKIN ALEKSEI IVANOVICH, KARLOV PAVEL MIHAILOVICH

Department of Pharmaceutical Chemistry and Pharmaceutical Technology, Voronezh State University, 394620, Street Studencheskya 3, Voronezh, Russia
Email: amilajh1982@hotmail.com

Received: 13 Dec 2016 Revised and Accepted: 14 Feb 2017


ABSTRACT

Objective: A simple, sensitive, precise, reproducible and validated UV spectrophotometric methods have been developed for the determination of vincristine (VCR) and vinblastine (VLB) in the pure and dosage forms.

Methods: The method was founded on the simple solubility of VCR and VLB in purified water, and their characteristic maximum absorption λ (max) at 295 nm and λ (max) at 268 nm for VCR and VLB respectively in the UV regions. The nature of obedience, to the Bouguer-Lambert-Beer’s law by the VCR and VLB in the range of concentration 5-50 µg/ml was employed to this method.

Results: Accuracy and reproducibility of the proposed method were statistically validated by recovery studies. The accuracy of the method for the VCR and VLB was ~ 100.4 % and ~ 100.32 % respectively with good reproducibility. The analytical curves were linear over a wide concentration range (5-50 µg/ml), with a correlation coefficient (r)-0.9998, and 0.9999 for VCR and VLB in that order. The method was showed sufficient precision, with a relative standard deviation (RSD) less than 1%.

Conclusion: The method was validated in accordance with Russian general pharmacopoeia article (RGPA) 42-0113-09 and ICH guidelines. Validated method can easily apply for fast, precise and reliable rapid assessment of drug forms and pure substances in the laboratory.

Keywords: Vincristine, Vinblastine, Analytical curve, Quantity determination, UV-visible spectrometry


INTRODUCTION

Catharanthus roseus (L.) G. Don (C. roseus) is a tropical plant, which belongs to the family of Apocynaceae. Vincristine and vinblastine are known, highly valuable terpenoid indole alkaloids (TIAs) from over 130 alkaloids, which were found in C. roseus. Dimeric TIA VCR has been widely used as an antitumor agent since the 1960s [1-8]. C. roseus has been used in traditional medicine in tropical and subtropical countries for the treatment of diabetes, hypertension, bleeding, scurvy, toothaches, and others from ancient time. [7] At the moment in vivo and in-vitro studies have demonstrated hypoglycemic, antihypertensive, anti-bacterial, anti-malarial, anti-arrhythmic and other properties of C. roseus [9-14].

The alkaloids can produce specific color reactions with various chemical reagents, some colorimetric methods for identification of TIAs were reported, as an example: VLB with 1% ferric ammonium sulfate solution and 75 % sulfuric acids mixture, was formed a dark bluish color. But those color reactions cannot use as the evidence for identification and characterize TIAs from other alkaloids types (tropane, quinolone, purine, etc.) and only indicating the presence of some alkaloids or amines derivatives [15].

The chemical structures of TIAs (fig.1) have chromophores and auxochromes groups, which were responsible for the appearance of the specific peaks in the absorption spectrum in the UV range. Usually, chromophores defined as unsaturated or aromatic units of molecules. Chemically pure VCR and VLB sulfates have characteristic absorption peaks in the UV spectrum. VCR sulfate have three characteristic peaks λ (max)-(222, 256, 298)±2 nm [16-18] and VLB sulfate has two characteristic peaks λ (max)-(214, 266)±2 nm [16-18] in the UV absorption spectrum in methanol. American (USP), British (B. Ph.), European (E. Ph.), Japanese (J. Ph. XVI) and International (Int. Ph.) Pharmacopeias have recommendations to use UV, and IR specter characterizes of chemically pure VCR, and VLB sulfates for identification and standardizations drugs contains those compounds.

Nowadays for the quantitative analysis of the terpenoid indole drugs usually appropriate methods are high performance liquid chromatography (HPLC) [19-21] (recommended method for VCR and VLB–E. Ph.7.0;J. Ph. XVI; B. Ph.2013;USP; Int. Ph.) and its variations like, HPLC-UV-detector [19, 21, 22], HPLC-with electrochemical detector [23-24], HPLC-isotope dilution thermospray mass spectrometry [25], and also methods like thin layer chromatography [7,19,26], liquid chromatography with mass spectral detection [21, 27, 28], capillary zone electrophoresis–mass spectrometry [20], capillary electrophoresis-mass spectrometry [11, 29], radio-immune analysis [30,31] etc. Many of these methods are characterized by highly labor intensive, the high cost of equipment’s, long duration of analysis time, as well as usually highly toxic chemicals, are required for an analysis procedure. Most spread commonly prefer analytical method in the most of the laboratories in these days, is HPLC, but all around high-cost outcome for one analysis avoid it from regular usage. The aim of this work was dedicated to producing validated a simple and affordable spectrophotometric method for evaluating the quality of drug VCR and VLB in pure substances, dosage formulations and the biological materials after pretreatments.

MATERIALS AND METHODS

Pharmaceutical formulations

Vinblastine-LANS®(LENS-Pharm Russia),vincristine-TEVA (Teva Pharmaceutical Industries Ltd., Israel), VERO-vincristine (LENS-Pharm Russia), vincristine-Richter (Gedeon Richter Ltd., Hungary) are meet al. l requirements of the current regulatory documentations in Russia, were purchased from the domestic market in Voronezh city.

Materials and reagents

All chemicals and reagents were of analytical grade and used without further purification, and all solutions were prepared fresh daily. Water has been purified using the medical water distillation apparatus AE-25 (Tumenmed, Russia). Analytical experiments were performed on a Hitachi ratio beam spectrophotometer U-1900 (Japan), data processing carried out using software packages, Microsoft Excel, StatSoft Statistica and Origin pro-2015.

Preparation of stock standard solution

As a result of low availability and the high cost of standard samples of VCR and VLB sulfates in the domestic market, in the experimental work, was used commercial dosage forms of these substances. Standard solution of VCR sulfate (solution A) was prepared using vincristine-TEVA 1.0 µg/ml, contain in the composition of 1.0 ml solution: active substance 1.0 mg VCR sulfate (calculated as anhydrous substance), as adjuvant-mannitol, sodium hydroxide, sulfuric acid and aqua pro injectionibus and vincristine-Richter lyophilisate 1.0 mg, in the composition, contain: active substance 100% pure VCR sulfate 1.0 mg, lactose as excipient. To prepare standard solutions (solution A) of VCR and VLB sulfates were used vincristine-Richter lyophilisate and vinblastine-LANS®lyophilisate, in composition contain 100% pure VCR and VLB.

VCR solution A (stock solution)–vincristine-Richter lyophilisate, a dosage of 1.0 mg five ampules, were accurately transferred into 50 ml volumetric flask separately and diluted with purified water to nominal volume, at the final solution concentration was 100 µg/ml.

VLB solution A (stock solution)–vinblastine-LANS®lyophilisate 5.0 mg was carefully transferred into 50 ml volumetric flask and diluted with purified water to the nominal volume, at the final solution concentration was 100 µg/ml. The standard solutions were found stable for at least one week without alteration when kept in an amber colored bottle and stored at 4 °C in the refrigerator when not in use.

General procedures

For the quantitative analysis of VCR and VLB, was applied analytical curve method [4, 16], constructed on the base of standard solutions series (n-10) with a concentration range of 5-50 µg/ml. A series of standard solutions samples (n-10) were prepared: from the standard solution A, was taken aliquot volume 0.5 ml, 1.0 ml, 1.5 ml, 2.0 ml, 2.5 ml, 3.0 ml, 3.5 ml, 4.0 ml, 4.5 ml and 5.0 ml, then diluted to 10 ml volume with purified water. Accordingly received standard sample solutions with concentration 5 µg/ml, 10 µg/ml, 15 µg/ml, 20 µg/ml, 25 µg/ml, 30 µg/ml, 35 µg/ml, 40 µg/ml, 45 µg/ml and 50 µg/ml respectively.

UV absorption spectrum of all samples of VCR and VLB sulfate were recorded over the wavelength range λ–400 nm to 190 nm, at room temperature (20 °C) using 10 mm quartz cell at Hitachi ratio beam spectrophotometer U-1900.

RESULTS

The aqueous solution of VCR sulfate has maximum absorption peak λ (max) at 295 nm±1 nm, 254 nm±1 nm and 219±1 nm, and VLB sulfate has λ (max) at 268 nm±1 nm and 219 nm±1 nm, respectively (fig. 2, fig. 3).

R–CHO-VCR, R-CH3-VLB

Fig. 1: The chemical structure of VCR and VLB*, A. Catharanthine fragment (indole fragment), B. Vindoline fragment (indoline fragments)
*The chemical structure was sketched in accordance with information in the references: [2, 16, 17]

The analytical range was selected, by analyzing the concentration of samples, the absorption values (Abs) were in the range of 0.1~1.0 at the chosen λ (max) 295 nm, 268 nm for VCR and VLB respectively. Theoretically, in this range, VCR and VLB concentration and absorption characters must have subjected to the Bouger-Lambert-Beer’s law with the least error. For the analytical range determination study, was prepared a series of standard solutions with concentration 250 µg/ml, 100 µg/ml, 50 µg/ml, 20 µg/ml, 10 µg/ml, 5 µg/ml, 1 µg/ml respectively. The experimental data were presented in the table. 1. In the results can identify the optimal concentration range for an analytical procedure was 5-50 µg/ml.

Fig. 2: UV absorption spectrum of VCR sulfate 40 µg/ml aqueous solution


Fig. 3: UV absorption spectrum of VLB sulfate 40 µg/ml aqueous solution


Table 1: The absorption value of VCR and VLB solutions in the analytical range

Solution conc. (µg/ml) VCR sulfate Abs λ 295 nm VLB sulfate Abs λ 268 nm
250 3.253±0.004 3.268±0.003
100 1.568±0.003 1.859±0.002
50 0.987±0.002 0.970±0.002
20 0.400±0.001 0.398±0.001
10 0.274±0.001 0.202±0.001
5 0.104±0.001 0.102±0.001
1 0.038±0.002 0.039±0.002

*Total amount of samples (n)-21, All Abs values represent mean±SD

The absorbance values of standard samples were registered using Hitachi ratio beam spectrophotometer U-1900, in 10 mm quartz cells at the room temperature (20 °C) with a scanning speed of 400 nm/min, a sampling interval of 0.5 nm and sensitivity value 1 with a 0.01 threshold. The maximum absorption (Abs) values of standard samples (5-50 µg/ml) VCR sulfate at wavelength λ (max) 295 nm and VLB sulfate λ (max) 268 nm were shown in table 2.

Table 2: Absorption values of the VCR and VLB sulfates standard solutions

Sample series №* VLB sulfate VCR sulfate
Con. (µg/ml) Abs λ (max) 268 nm Con. (µg/ml) Abs λ (max) 295 nm
1 5 0.105±0.001 5 0.109±0.002
2 10 0.200±0.001 10 0.208±0.001
3 15 0.298±0.001 15 0.304±0.001
4 20 0.403±0.001 20 0.405±0.001
5 25 0.498±0.001 25 0.502±0.001
6 30 0.593±0.001 30 0.588±0.002
7 35 0.681±0.001 35 0.694±0.001
8 40 0.782±0.002 40 0.803±0.002
9 45 0.874±0.004 45 0.893±0.001
10 50 0.971±0.002 50 0.984±0.005

*Total amount of samples (n)-30, All Abs values represent mean±SD

The calibration curves were constructed by plotting absorbance vs. concentration of VCR and VLB standard samples. The parameters of calibration curves of the VCR and VLB were shown in table 3. Linear regression was calculated based on the obtaining experimental data using the software package, Microsoft Excel and Origin Pro 2015.

Fig. 4: Calibration graph of VCR sulfate


Fig. 5: Calibration graph of VLB sulfate


Table 3: Parameters of the regression equation of VCR and VLB

Parameters VCR sulfate VLB sulfate
Slope 0.01954 0.01923
Intercept 0.01120 0.01153
Linear regression y = 0.0195x+0.0112 y = 0.0192x+0.0115
Correlation coefficient(r) 0.99985 0.99991
Coefficient of determination R2 0.99971 0.99978
SD 0.00538 0.00438
Limit of quantification (µg/ml) 6.389 6.126
Limit of detection (µg/ml) 2.108 2.022

Validation procedure of the analytical method was performed, according to the requirements of general pharmacopeia article 42-0113-09 (12th State Pharmacopoeia Russian Federation) and ICH guidelines, by following criteria: specificity, linearity, precision, accuracy, limit of detection, limit of quantification, and stability (robustness) of the analytical method [32, 33].

The precision and accuracy determination

Three different concentrations in the range of 5-50 µg/ml, was selected for the experiment as sample standard solutions, one of them belong to the lower level 10 µg/ml, middle level 25µg/ml, and higher level 40 µg/ml. Measurements were carried out as follows: in each one of the three levels were contain nine different samples (total amount of 27 samples),on three different days, all the analyzed solutions were prepared in the same conditions, from the freshly prepared stock solutions each day, as a result of the absorption measurements of 27 samples, the median values were found for the each series.

The results were presented in tables 4 and 5 respectively. The accuracy was determined by adding standard amounts of VCR and VLB into 50 µg/ml, 125 µg/ml, and 250 µg/ml sample solutions, after that final solutions absorption values were measured and found a median value for each sample. The results were shown in table 6 and 7 in that order.

Table 4: The experimental data of the precision (VCR sulfate)

Sample

Series No.*

Theoretical con. of samples (µg/ml)

Determined concentration of

samples (µg/ml)

R (%) R(%)(mean) SD RSD
1 10 10.30±0.089 103.53 100.08 0.5233 0.5299
2 10 9.81±0.059 98.10
3 10 9.79±0.051 97.90
4 25 24.75±0.030 99.01
5 25 26.05±0.029 104.2
6 25 24.79±0.051 99.16
7 40 39.30±0.078 98.25
8 40 41.13±0.078 102.83
9 40 39.10±0.078 97.75

*Total amount of samples (n)-27, All Abs values represent mean±SD


Table 5: The experimental data of the precision (VLB sulfate)

Sample

Series No.*

Theoretical conc. of

samples (µg/ml)

Determined conc. of

samples (µg/ml)

R (%) R(%)(mean) SD RSD
1 10 10.13±0.06 103.53 100.17 0.9271 0.9255
2 10 10.15±0.08 98.10
3 10 10.15±0.08 97.90
4 25 25.02±0.03 99.01
5 25 25.13±0.08 104.2
6 25 25.06±0.12 99.16
7 40 39.60±0.10 98.25
8 40 39.69±0.03 102.83
9 40 39.90±0.06 97.75

*Total amount of samples (n)-27, All values represent mean±SD


Table 6: Experimental data of determining the accuracy of the analytical method (VLB sulfate)

Sample

Series No.*

Amount of sample taken-

m** (µg)

Amount of

Standard added

M** (µg)

Abs value

of the final solution (m+M)

Found amount

(µg)

Found

amount

(%)

R%(mean) SD RSD
1 50 200 0.491±0.001 249.36 99.74 100.32 0.1080 0.1077
2 50 200 0.492±0.001 249.88 99.95
3 125 200 0.65±0.002 332.053 102.17
4 125 200 0.65±0.002 332.053 102.17
5 250 50 0.589±0.002 300.328 100.11
6 250 50 0.587±0.002 299.288 99.76
7 250 200 0.871±0.002 446.99 99.33
8 250 200 0.871±0.002 446.99 99.33

*Total amount of samples (n)-24, All Abs values represent mean±SD, ** Quantity of VCR and VLB in the sample-m (µg) and M (µg), was calculated according to 100 µg/ml standard stock aqueous solution.


Table 7: Experimental data of determining the accuracy of the analytical method (VCR sulfate)

Sample

Series No.*

Amount of sample taken-

m** (µg)

Amount of

standard added

M** (µg)

Abs of the final solution (m+M) Found amount (µg)

Found amount

(%)

R%(mean) SD RSD
1 50 200 0.501±0.002 250.642 100.257 100.14 0.1485 0.1483
2 50 200 0.503±0.001 251.656 100.666
3 125 200 0.646±0.003 324.842 99.951
4 125 200 0.648±0.002 325.865 100.266
5 250 50 0.598±0.002 300.279 100.093
6 250 50 0.597±0.001 299.767 99.922
7 250 200 0.891±0.002 450.214 100.05
8 250 200 0.890±0.002 449.702 99.934

*Total amount of samples (n)-24, All Abs values represent mean±SD, ** Quantity of VCR and VLB in the sample-m (µg) and M (µg), was calculated according to 100 µg/ml standard stock aqueous solution.

Sensitivity

The limit of detection (LOD) has been established in compliance with the general pharmacopoeia article 42-0113-09. The detection limit for VCR and VLB were calculated according to the equalization of the calibration curve. The theoretical value of the LOD was experimentally confirmed using VCR sulfate, and VLB sulfate sample solutions which were solution concentration related to 1 µg/ml.

The results were presented in the table. 8.

Table 8: Limit of detection parameters of VCR and VLB

Substance Concentration of sample solution (µg/ml)

Absorption

value

Theoretical limit of detection (µg/ml) Experimentally stablished limit of detection by linear regression (µg/ml)
VCR sulfate 1.0 0.039±0.002 2.1081 1.4226
VLB sulfate 1.0 0.035±0.001 2.0219 1.2205

*Total amount of samples (n)-6, All Abs values represent mean±SD


Fig. 6: The detection limit VCR and VLB sulfate aqueous solution

The robustness determination

The polarity of the solvent and the pH of the medium may affect the electron transition of the molecules during energy absorption from the electromagnetic wave. For example, the polarity of the solvent can affect the π → π * transition (excited level), n → π * transitions, in an acidic medium can disappear [34]. It is, therefore, necessary to establish the optimal conditions for an analytical method under the criteria: the medium pH and the solvent polarity.

When determining an optimal pH environment for the analytical method, were used different buffer solutions, in the pH range of 3 to 10.

Series of buffer solutions pH 3-10 were prepared by following the Russian general pharmacopoeial article 42-0072-02. The pH of each solution was adjusted to an appropriate value using the pH meter with accordance to the pharmacopoeial article. Freshly prepared solutions were always employed.

For determination of the robustness prepared series of 25 µg/ml standard solutions VCR and VLB, as the solvent used buffer solutions in range pH 3 to pH 10. pH of the purified water and all the buffer solutions was measured at room temperature (20 °C) using a pH meter model, pH-121(Russia). The maximum absorption λ (max) values of VCR and VLB 25 µg/ml standard solutions were shown in table 10 and the graphical demonstration in fig. 7.

Table 9: Variation of λ (max) VCR with different solvents

Type of solvent

Concentration of solution

VCR (µg/ml)

VCR λ (max)

(nm)

Absorption

value Abs (VCR)

Concentration of solution VLB (µg/ml)

VLB λ(max)

(nm)

Absorption value Abs (VLB)
Purified water 10 295 0.263±0.001 40 268 0.628±0.001
0.1 mol HCl 10 296 0.300±0.001 40 268.5 0.544±0.001
0.1 mol NaOH 10 298 0.251±0.001 40 267 0.538±0.001

*Total amount of samples (n)-9, All Abs values represent mean±SD


Table 10: Variation of λ (max) and absorption of VCR and VLB according to medium pH

Variation of

λ max (nm)

Variation of Abs VLB sulfate 25 µg/ml standard buffer solutions
Purified water pH-3 pH-4 pH-5 pH-6 pH-7 pH-8 pH-9 pH-9.3 pH-10
260.5 - - - - - - - - - 0.394****
261 - - - - - - - 0.394*** 0.395*** -
266.5 - - - - - - 0.392** - - -
267 - - - - - - - - - -
267.5 - 0.439* - - - - - - - -
268 0.492* - 0.452* 0.458* - - - - - -
269 - - - - 0.448* 0.441* - - - -
Variation of Abs VCR sulfate 25 µg/ml standard buffer solutions
295 0.498* - - - - - - - - -
295.5 - 0.421* - 0.429* 0.495* 0.431* - - - -
296 - - 0.415* - - - 0.522** - - -
296.5 - - - - - - - - - -
297.5 - - - - - - - 0.416*** 0.397*** 0.43****

*Total amount of samples (n)-30, All Abs values represent mean±SD, [SD–where, *±0.001, **±0.002, ***±0.003, ****±0.004 respectively]


Table 11: Absorption values of VCR and VLB aqueous standard solutions at λ(max)

Concentration of VCR (µg/ml) Absorption value VCR Absorption value VLB

Concentration of VLB

(µg/ml)

λ (max) nm λ (max) nm
256 nm 295 nm 214 nm 268 nm
5 0.114±0.002 0.109±0.002 0.313±0.001 0.105±0.001 5
10 0.219±0.001 0.208±0.001 0.661±0.001 0.200±0.001 10
15 0.313±0.002 0.304±0.001 1.000±0.001 0.298±0.001 15
20 0.413±0.001 0.405±0.001 1.360±0.002 0.403±0.001 20
25 0.509±0.001 0.502±0.001 1.701±0.001 0.498±0.001 25
30 0.593±0.002 0.588±0.002 2.038±0.001 0.593±0.001 30
35 0.697±0.001 0.694±0.001 2.396±0.001 0.681±0.001 35
40 0.806±0.002 0.803±0.002 2.813±0.002 0.782±0.002 40
45 0.902±0.001 0.893±0.001 3.123±0.004 0.874±0.004 45
50 1.004±0.005 0.984±0.005 3.319±0.003 0.971±0.002 50
100 1.582±0.005 1.568±0.005 3.563±0.005 1.895±0.005 100

*Total amount of samples (n)-33, All Abs values represent mean±SD


Table 12: The ratio of the optical density (Abs) value VCR and VLB aqueous standard solutions in λ (max)

Ratio of λ (max) in analytical range The ratio value
VCR λ (max) 256 nm/λ (max) 295 nm 1.0202±0.0182
VLB λ (max) 214 nm/λ (max) 268 nm 3.3067±0.1778

All values represent mean±SD

The ratio of the optical density (Abs) value at λ (max) 295 nm over λ (max) 256 nm for VCR standard aqueous solutions and at λ (max) 268 nm over λ (max) 214 nm for VLB standard aqueous solution (table. 10) were calculated. The nearly constant ratio values were demonstrating their conformity to the law of Bouguer-Lambert-Beer's in the analytical range.

DISCUSSION

The US Pharmacopoeia Convention 2011, recommend using a solution of ammonium formate buffer as a solvent for the spectrophotometric quantitative determination method VCR sulfate for best practices, solvent pH corresponded to pH 5 and λ(max)at 292 nm. Bhaskar et al. were demonstrated a spectrophotometric method for determination and quantity analysis of VLB tableted drug form λ (max) at 420 nm in the visible range; methanol was used as solvent [35]. Different from that method, in this experiment was established, that the quantitative determination of VCR and VLB sulfate in the substances and dosage forms can use purified water as a solvent. The optimal analytical maximum were λ (max)-295 nm and λ (max)-268 nm for the VCR and VLB sulfate respectively. Nagaraja et al.[36] were developed the spectrophotometric method for determination VCR and VLB sulfate base on the forming color complex with diazotized dapsone. VCR and VLB were formed yellow azo products with absorption maxima at 430 nm, with ferricyanide in hydrochloric acid medium yield blue products with absorption maxima at 750 nm. The major problem of the complex-forming reactions with TIAs had to control a lot of factors to maintains the stability of the formed complex. Nagaraja et al. were demonstrated those color complexes stable for 1 hour; then the analysis procedure has to complete within 1 hour. In here described method no need any additional treatment, chemicals, and reagents for the analysis procedure and aqueous solutions have a long stable period (stable for at least one week without alteration at 4 °C).

Fig. 7: Variation of λ (max) and absorption VCR and VLB according to medium pH, (graphical demonstration)


Fig. 8: VCR aqueous standard solutions optical density ratio value in λ (max) 256 nm/295 nm


Fig. 9: VLB aqueous standard solutions optical density ratio value in λ (max) 214 nm/268 nm

The medium pH changes can impact to the absorption maximum of VCR and VLB. In the more acidic environment was disappearing absorption maximum in the region 190-230 nm, for VCR absorption maximum at λ (max)-219 nm and VLB at λ (max)-214 nm. Also, the absorption maximums in the 230-300 nm region were changing, the maximum peak shifted to the side of increasing wavelengths (right), and the absorption intensity was decreased. In the experiment was established, using freshly prepared purified water (pH-5.20 at 20 °C) as a solvent, was the best alternative for the elaborate an analytical method except for methanol or buffer solution recommended in the pharmacopoeial method. The regression equation, standard deviations, correlation coefficient (r), y = 0.0195x+0.0112, 0.00538, 0.9997, and y= 0.0192x+0.0115, 0.00438, 0.9998 for VCR sulfate, and VLB sulfate were demonstrated precise linearity in the analytical range. The calculated mean value of absorption ratio, for VCR λ (max) 256 nm/λ (max) 295 nm (1.0202±0.0182), and VLB λ (max) 214 nm/λ (max) 268 nm (3.3067±0.1778) were testified the purity of the substance and obedience to Bouguer-Lambert-Beer’s law in the analytical range (5-50 µg/ml). This information can have used to identify impurities (light-absorbing substances) of the VCR and VLB sulfate in the substance and the dosage forms.

In the validation procedure was established the accuracy (mean±SD) of the quantitative determination of the analytical method for VCR sulfate ~ 100.4±0.1485 %, and VLB sulfate ~ 100.32±0.1080 % with RSD less than 1%. Bhaskar et al.[35] were shown in their experiment, the accuracy of the developed analytical method for velban (VLB) 101.97±0.0031 %, and a method was described in this paper has shown pretty decent accuracy according to the Bhaskar et al. method. The reproducibility and repeatability of the developed method were established by the study of precision for VCR and VLB determined by 27 samples inside and inter-laboratories analyzed, and the RSD was found to be less than 1%. The validated analytical method was applied for Vincristine-TEVA and VERO-vincristine quality assessments and was established those commercial dosage form meets the all the pharmacopeial requirements.

CONCLUSION

Nowadays for the quantitative analysis of the terpenoid indole drugs group usually appropriate methods were HPLC and its variations, because of those methods have high sensitivity and selectiveness but labor intensiveness, the cost of the instruments and additional chemicals, duration of analysis time and repeatability keep those methods away from regular usage in the clinical laboratories. In this paper was described the application possibility of a simple spectrophotometric method for quality and quantity determination of VCR and VLB in bulk and dosage forms in the UV region. As a solvent was using freshly prepared purified water, and simple analytical procedure were major benefits of this method. The validated analytical method was simple, rapid, reproducible, accurate, precise and cost-effective, can apply for the quality control purposes of substances and as well as for the drugs forms well.

CONFLICT OF INTERESTS

Declared none

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How to cite this article

  • Halahakoon Amila Jeewantha, Slivkin Aleksei Ivanovich, Karlov Pavel Mihailovich. Validated spectrophotometric method for the estimation of vincristine and vinblastine. Int J Pharm Pharm Sci 2017;9(4):78-86.

About this article

Title

VALIDATED SPECTROPHOTOMETRIC METHOD FOR THE ESTIMATION OF VINCRISTINE AND VINBLASTINE

Keywords

Vincristine, Vinblastine, Analytical curve, Quantity determination, UV-visible spectrometry

DOI

10.22159/ijpps.2017v9i4.16577

Date

14-02-2017

Additional Links

Manuscript Submission

Journal

International Journal of Pharmacy and Pharmaceutical Sciences
Vol 9, Issue 4, 2017 Page: 78-86

Online ISSN

0975-1491

Statistics

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Authors & Affiliations

Halahakoon Amila Jeewantha
Department of pharmaceutical chemistry and pharmaceutical technology, Voronezh state university, 394620, street Studencheskya 3, Voronezh, Russia
Russian Federation

Slivkin Aleksei Ivanovich
Department of pharmaceutical chemistry and pharmaceutical technology, Voronezh state university, 394620, street Studencheskya 3, Voronezh, Russia
Russian Federation

Karlov Pavel Mihailovich
Department of pharmaceutical chemistry and pharmaceutical technology, Voronezh state university, 394620, street Studencheskya 3, Voronezh, Russia
Russian Federation

 

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