Anna Materiienko; Volodymyr Grudko; Victoriya Georgiyants
The National University of Pharmacy, Kharkiv, Ukraine
Čes. slov. Farm., 2016; 65, 32-33
44<sup>th</sup> Conference drug synthesis and analysis
Pharmaceutical products can be contaminated by other active pharmaceutical ingredients, by cleaning agents, or by other materials. Cleaning processes in pharmaceutical industry have been regulated by the implementation of the Good Manufacturing Practice rules. Cleaning procedures include sampling and testing for allowable trace amounts of active pharmaceutical ingredients or excipients that were apart of the previous preparation1, 2).
There are two methods of sampling that are considered to be acceptable: direct surface sampling (swab method) and indirect sampling (use of rinse solutions). The acceptance limits of contaminants and residues are determined in the International Conference on Harmonisation (ICH) guidelines on their specific toxicity in tested impurities3, 4).
The suitability of the material to be used for sampling and the suitability of the sampling medium should be determined. The ability to recover samples accurately may be affected by the choice of the sampling material. Amajor complication when using rinse solutions is probably very dilute solutions since the quantitative content of the active substance is not always possible to determine by the available analytical methods1, 3).
Carmoisine (E 122) (Fig. 1) is ared-coloured synthetic food azo dye, aderivative of diazosulfonaphthalenes, acrystalline substance that is soluble in water. It is used to provide acertain colour for many medicines as for individual matters and mixed with other dyes5).
Methods for determining the dyes in food and medicines by HPLC are known6). But these methods are laborious, they require alot of time and use expensive equipment that carries great expenses to pharmaceutical manufacturers.
The goal of our work is to develop an express spectrophotometric procedure for determining the residual quantities of carmoisine dye in rinse solutions to control the completeness of the process equipment cleaning.
During carrying out the experimental researches, the following materials and methods were used – the synthetic food dye carmoisine (series 657334(1-20)-657383(1-20)) and the medicinal substance myramistin (series 010514). Analytical researches were performed on aspectrophotometer Evolution 60S. For operation we used an AXIS ANG200 analytical balances, Class Ameasuring glassware and excipients which meet the requirements of the State Pharmacopoeia of Ukraine (SPhU)7) which are harmonized with the European ones8).
To develop the control methods of equipment cleaning, we propose to use an extractive photometry method using the reaction of formation of the ion associate of carmoisine with myramistin. Due to the earlier results9), for the process of concentration of the substance contained in alarge volume of liquid it is possible to use an extraction of forming ion associate by aminimum volume of an extractant. We found previously that the forming ion associate is extracted well with chloroform. We decided to use amixture of butanol and chloroform for extraction. The sample solution was used to choose the optimal ration of chloroform and butanol.
Preparation of sample solution: 0.1ml of 14 ∙ 10–3M carmoisine solution was placed into a1000.0ml volumetric flask, 2.5ml of 1 ∙ 10–3M myramistin solution was added and adjusted to the mark with water R.The resulting sample solution was transferred to aseparating funnel and extracted with aportion of organic solvent of 50.0ml. The obtained extract was measured on aspectrophotometer at 523 nm wavelength against ablank solution.
The results are presented in Table 1.
One of the major requirements that determine the possibility of using spectral methods to quantify the matter is subordination of light absorption solution of Beer-Lambert law.
To test this subordination, 0.0500g of astandard dye sample (accurately weighed) quantitatively with 60ml of water R was transferred to avolumetric flask of 100.0 ml, adjusted to the mark with the same solvent and thoroughly mixed. The aliquots of 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0 ml, respectively, of the resulting solution were taken and placed into a100.0ml volumetric flask and adjusted to the mark with the same solvent. The measurement of absorbance was carried out at 517 nm wavelength in aditch with alayer thickness of 10mm against ablank solution.
During the control of cleaning equipment, definition of dye residues was carried in asolution with avery low concentration. We have also tested that the light absorption of carmoisine and myramistin mixture solutions subordinates the Beer-Lambert law in aconcentration of 1–10 ∙ 10–6M.
Results and discussion
Analysis of data in Table 1 shows that the optimal ratio of chloroform and butanol in the organic phase depends on the partial solubility of butanol and chloroform in water. Accordingly, it is proposed to use chloroform and butanol ratio of 1 : 1 for the extraction of the ion associate of carmoisine with miramistin from rinse solutions.
The results suggest that the solution of carmoisine subordinated the Beer-Lambert law in concentrations of 0.5–5.0 mg/100ml. The specific absorbance is 446 ± 3.
The results suggest that the solution of the associate subordinated the Beer-Lambert law in concentrations 1 ∙ 10–6 – 10 ∙ 10–6M. The molar absorptivity is 11214 ± 460.
Method of determination the carmoisine in quality control of equipment cleaning
Place a1000.0ml of rinse solution into aseparating funnel, add 2.5ml of 1 ∙ 10–3M myramistin solution and mix. Add 50.0ml of amixture solution of chloroform and butanol (in the ratio 1 : 1) to the obtained solution, shake it intensively for 2 minutes and leave for 5 minutes to separate the layers. Measure the absorbance on aspectrophotometer at 523 nm wavelength against blank solution, which is used as amixture of chloroform with butanol.
Preparing the solution of dye standard sample
0.0500g of standard dye sample (accurately weighed) is quantitatively transferred to avolumetric flask of 100.0 ml, adjusted to the mark with the water R and thoroughly mixed. The aliquot of 1.0ml of the resulting solution is taken and placed in a100.0ml volumetric flask and adjusted to the mark with the same solvent.
Calculate the residual quantities of carmoisine in rinse solution (in mg) using the formula:
where А absorbance of test solution, Ast absorbance of standard solution, Сst concentration of standard solution, mg/ml.
In order to obtain the metrological characteristics of the method developed for the determination of residual quantities of carmoisine dye in rinse solutions, we used the method of modelling samples.
Preparation of sample solution: 0.1ml of 14 ∙ 10–3M carmoisine solution was placed into a1000.0ml volumetric flask, 2.5ml of 1 ∙ 10–3M myramistin solution was added and adjusted to the mark with water R.The resulting sample solution was transferred to aseparating funnel and extraction was performed by the developed method described above.
The results are given in Table 2.
Amethod of determination of residual quantities of carmoisine in rinse solutions from the surface of the pharmaceutical equipment was developed.
Asimple and expressive procedure, which is characterized by satisfactory metrological characteristics, was proposed.
The method can be recommended for the determination of residual quantities in the control of fullness cleaning of process equipment for pharmaceutical companies.
Conflict of interest: none.
The National University of Pharmacy
Pushkinska str. 53,
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