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A new liquid phase microextraction method-based reverse micelle for analysis of dexketoprofen in human plasma by HPLC-DAD

Abstract

A new liquid phase microextraction method was developed by used reverse micelle-based coacervates as microextraction agents for the separation of dexketoprofen (DKT) from human plasma before its determination by high-performance liquid chromatography with photodiode-array detection (HPLC-DAD). The change in the concentration of dexketoprofen in the plasma of the male and female patients was successfully monitored by using this method. The proposed method involves the use of reverse micelles of decanoic acid (DA) are dispersed in tetrahydrofuran (THF) and aqueous system. After addition of the DA and THF to the aqueous sample phase, the formation of micelles of nano and molecular size was observed in an ultrasonic bath. The solution was centrifuged, and the DKT extracted into the DA phase was analyzed by HPLC-DAD. Some analytical parameters that important in the developed procedure were examined in detail. The limit of detection (LOD), the limit of quantification (LOQ), the intraday, and inter day relative standard deviation (RSD, %) of the developed method in the plasma sample were found to be 12.8 ng mL−1, 38.8 ng mL−1, 1.7 and 3.9%, respectively. Additional/recovery studies were performed in plasma samples with proposed method, and quantitative recoveries were obtained in the range of 97–100%. The developed microextraction method was applied to human plasma that taken from volunteer patients for the determination of DKT.

Graphical abstract

Introduction

Non-steroidal anti-inflammatory drugs (NSAIDs) are widely used by the adult person who has headache, pain, cold, rheumatoid arthritis, osteoarthritis, acute gouty arthritis, and dysmenorrhea. Dexketoprofen trometamol is a water-soluble salt of the S (+) enantiomer of the ketoprofen (Wongrakpanich et al. 2018). The most important adverse effect of NSAID use are gastrointestinal complications, including ulcers and bleeding, and renovascular/cardiovascular reactions with fluid retention and in some cases, deteriorated renal function, resulting in elevated blood pressure and an increased risk for heart failure (Buffum and Buffum 2000; Miranda et al. 2016). The recommended analgesic and anti-inflammatory dose of dexketoprofen is 12.5 to 50.0 mg. The results of preclinical studies suggest that lower dosages of the dexketoprofen may be active. The quantification of dexketoprofen in human plasma is important for regulate the plasma concentration of the drug and minimize the side effects (Esparza-Villalpando et al. 2018).

A lot of analytical methods are reported for quantitative analysis of dexketoprofen in biological matrix and pharmaceutical dosage such as liquid chromatography-tandem mass spectrometry (Tettey-Amlalo and Kanfer 2009; Wille et al. 2010), high-performance liquid chromatography (Marco-Urrea et al. 2010; Bhusari and Dhaneshwar 2011; Dvořák et al. 2004; Abolu-Enein et al. 2003), and spectrophotometric methods (Mabrouk et al. 2014; Choudhari et al. 2012).

The sample preparation for dexketoprofen usually achieved through liquid-liquid extraction (LLE) and solid phase extraction (SPE) (Moein et al. 2017). The conventional sample extraction techniques such as LLE and SPE have some important disadvantages that LLE require high-volume toxic solvent and SPE need to have expensive and specific sorbent for extraction of analytes. On the other hand, these techniques take a long time for extraction (Kole et al. 2011; Vaghela et al. 2016).

Green analytical chemistry extraction techniques and sample preparation are the most important issues in the last decade. The main objectives of green analytical chemistry are assessment in the use of chemical and toxic use, minimize time and energy consumption, reduce wastage of sample preparation, and improve safety in the laboratory.

The new extraction methods for main targets of green chemistry have developed microextraction methods involving liquid phase microextraction (LPME) and solid phase microextraction method (Armenta et al. 2008; Haq et al. 2017). LPME methods are more attractive, and some advantages are simplicity, sensitivity, rapidly, and environmentally friendly. The discovering of new non-toxic solvents has increased LPME methods for sample preparation (Mohamed 2015).

Reducing organic solvent consumption has encouraged the development of more environmentally friendly sample treatments in analytical processes. Reverse micelle-based coacervates are nanostructured liquids produced in colloidal solutions of amphiphilic compounds by spontaneous, sequential self-assembly, and coacervation (Ballesteros-Gómez et al. 2010). Reverse micelle-based coacervates have intrinsic properties that make them very attractive for extraction processes. These properties were derived from the amphiphilic character of the molecules making them and their high concentration. Thus, nanostructures in the reverse micelle-based coacervates have regions of different polarity that offer several types of interactions for solutes and consequently mixed mechanisms for their solubilization (Feizi et al. 2017; López-Jiménez et al. 2014). These solvents have different interactions with this kind of structure. Reverse micelle-based coacervates involve both dispersion and hydrogen bonding interactions. This nanostructured liquid provides an excellent reaction media for the extraction process. Due to the fact that reverse micelle-based coacervates have excellent properties, their usage in liquid phase-based microextraction techniques for organic and inorganic analytes determinations is increasing day by day (Ballesteros-Gómez and Rubio 2012).

The aim of this research was to perform a suitable liquid phase microextraction method by using decanoic acid as reverse micelle-based coacervates that is rapid, easy, safe, and low-cost for separation of dexketoprofen from human plasma prior to HPLC-DAD analysis.

Experimental

Instruments and reagents

The chromatographic separation and determination was carried out by Agilent 1200 series high-performance liquid chromatograph equipped with a diode array detector. A pH meter (Inolab, WTW pH720, Germany, Weilheim), an ultrasonic water bath (Bandelin Sonorex, Germany, Berlin) was used to emulsify the solutions, which improve the extraction efficiency. Centrifugal device (Nüve, NF 800, Turkey, Ankara) was used to accelerate the separation of extraction phases. The images of nano and molecular micelles were obtained by scanning electron microscope (SEM) (Zeiss Evo LS10, Jane, Germany) at Erciyes University Nanotechnology Application and Research Center.

For chromatographic analysis of dexketoprofen, we applied the modified method of Barbanoj et al. for determination of dexketoprofen from plasma (Barbanoj et al. 1998). A C18 chromatography column (250 × 4.6 mm, 5 μm, HiChroma, UK) was used for the separations. The mobile phase were a mix of acetonitrile:phosphate buffer solution (pH 3.0, 25 mM, phosphoric acid: sodium phosphate), (70:30 v/v). The flow rate is 0.7 mL/min. The sample injection volume was 20 μL and determination wavelength was 256 nm.

DA and THF were purchased from Sigma-Aldrich (Germany, Steinheim). Dexketoprofen (purity > 99.5%) was donated from Deva drug company (Turkey, Istanbul). Stock solution of dexketoprofen prepared concentration of 100 μg mL−1 in methanol and stored at 4 °C. The HPLC grade acetonitrile was purchased from Merck (Germany, Darmstadt). All aqua solutions were prepared by using deionized water (15 MΩ cm−1, resistivity) obtained from Millipore Elix 5.

Coacervative microextraction of dexketoprofen

Schematical diagram of the developed liquid phase microextraction (LPME) procedure is shown in Fig. 1. In this method, 10 mL of aqueous sample solution containing different concentrations of dexketoprofen, 1 mL of phosphate buffer (pH 3.0, 100 mM), and 200 mg Decanoic acid (as reverse micelle coacervates agent) were placed in 10 mL of centrifuge tubes. Then, 600 μL of THF was added into the homogeneous solution leading to aggregation of decanoic acid molecules and consequently a turbid solution. In order to entirely disperse the aggregated decanoic acid droplets into aqueous phase, the turbid solution was sonicated for 7 min in ultrasonic bath. At this step, the aggregated reverse micelle droplets progressively broke into nano- or micro-sized reverse micelle coacervates since ultrasonic wave cause transient cavitation near the interface of reverse micelle droplets. After centrifuging for 10 min at 4000 rpm, two clear phases consist of aqueous phase and reverse micelle rich phase were observed and the lower aqueous phase was withdrawn through a micro-syringe. The about 200 μL of the reverse micelle rich phase was obtained and diluted acetonitrile to 500 μL and 20 μL of this solution was injected into the HPLC-DAD system for dexketoprofen analysis. The same procedures explained in above sections were applied to plasma samples taken from male and female patients. The calibration curve of plasma and aqueous model samples were determined based on peak areas of dexketoprofen, and the enrichment factors were calculated. The results of the plasma sample analysis were quantified from the calibration curve and multiplied by the enrichment factor that 2 for plasma samples.

Fig. 1
figure1

Schematical diagram of the developed liquid phase microextraction method

Pretreatment of plasma samples

Blood samples were obtained from volunteer patients. Firstly, before using medicine and after taking dexketoprofen was taken blood samples. Samples centrifuged at 4000 rpm 25 min for separate plasma and other component of blood. Plasma samples (aprox. 6 mL) were stored at – 20 °C before extraction procedure was developed. The most important feature of plasma and serum is that it contains a large amount of protein. There is a strong affinity among proteins and drugs. Dexketoprofen and other analgesic drugs are strongly bounding to plasma proteins, particularly albumin. Therefore, the problem is physiologically destroying the binding of the drug to the protein and extracting the total drug for analysis. The simplest and oldest method is to precipitate proteins and isolate the filtrate (supernatant). It is denatured by protein precipitation and drug binding ability is impaired. Thus, the total drug is released into the filtrate. It is recommended that at least twice the volume of methanol, ethanol, or acetonitrile is required to precipitate all plasma proteins (Xue et al. 2006).

Hence, 1.0 mL from human plasma samples was obtained and 2.0 mL acetonitrile was added to remove plasma proteins and the developed microextraction method was applied to supernatant by adjusting the pH to 3.0 with 0.25 M hydrochloric acid and phosphate buffer solution. Then developed method was applied to supernatant. The results of the plasma sample analysis were calculated from the calibration curve and multiplied by the enrichment factor.

Results and discussion

Effect of pH on the microextraction efficiency of DKT

In the extraction methods, the optimum pH of the sample solution is very important for analytes to passage into the extraction phase from the water phase/plasma matrix. Thus, the effect of pH on the recovery of DKT was studied in the range of 2.0–9.0. The peak area results in Fig. 2 show that the maximum recovery for DKT is obtained at pH 3.0. It can be explained as follows: formation of reverse micelle coacervates occurs from protonated decanoic acid (pKa = 4.8 ± 0.2); hence, maximum extraction efficiency is expected to be below pH 4.0. Moreover, pKa value of the DKT is 4.55, for extraction of the DKT from aqueous phase to DA phase, must be nonionic form of DKT; hence, pH of extraction medium must be lower than 4.55. The procedure was carried out pH 3.0 for the further experiments.

Fig. 2
figure2

Effect of pH on the extraction efficiency of DKT (n = 3)

Effect of decanoic acid amount on the microextraction efficiency of DKT

The major components of the reverse micelle coacervates are DA and THF. Therefore, the amount in the colloidal solution mainly affects both the volume of extractant and the extraction efficiency of DKT. Hence, the amount of DA has a significant effect on the extraction DKT from plasma samples. For this purpose, we studied the amount of DA with range of 50–300 mg (Fig. 3). As the amount of decanoic acid added to the aqueous phase increased up to 200 mg, the micelle coacervate volume and consequently the extraction efficiency increased. However addition of DA more than 200 mg caused a decrease in extraction efficiency of DKT. Hence, we chose 200 mg of DA as optimum value for the subsequent experiments.

Fig. 3
figure3

Effect of DA amount on the extraction efficiency of DKT (n = 3)

The SEM images of micelles of decanoic acid are examined; it is seen that nano- and molecular-sized micelles are formed in sample solution. The images of micelles are presented in Fig. 4. The obtained SEM images are suitable according the research by Namani and Walde (2005).

Fig. 4
figure4

Scanning electron micrograph of the prepared from decanoic acid/THF (200 mg/600 μL) at pH 3.0 (10 mM). Length of the bars are 200 nm and 2 μm respectively.

Effect of THF volume on the microextraction efficiency of DKT

THF acts as a dispersing solvent and causes self-assembly of decanoic acid, which is composed of reversed micelles. The volume of THF greatly influences both the volume of extractant and the extraction efficiency in the cloudy solution. To examine the effect of the volume of THF, the range of 300–1000 μL THF volume was studied. The optimum volume of THF was determined to ensure better micelle formation, better dispersion, and quantitative recovery of DKT (Fig. 5) For the extraction method, 600 μL of THF was selected, and this volume was used in subsequent studies.

Fig. 5
figure5

Effect of THF volume on the extraction efficiency of DKT (n = 3)

Effect of sonication time on the microextraction efficiency of DKT

The interactions of analytes in aqueous and extraction phases are increased with basic laboratory equipment such as ultrasonic baths, vortex, etc. The ultrasonic waves lead to micro or nano-sized tiny reverse micelle coacervates and extractor droplets (cloudy solution) in sample media. Hence, the equilibrium state is quickly completed and as a result, high-extraction yield is obtained.

The optimum sonication time for microextraction procedure was investigated different time at the range of 1–10 min. As shown in Fig. 6, the obtained results for 7 min sonication are enough to obtain quantitative extraction efficiency for DKT.

Fig. 6
figure6

Effect of ultrasonic vibration time on the extraction efficiency of DKT (n = 3)

Analytical performance

The analytical performance including limit of detection (LOD), limit of quantification (LOQ), intraday relative standard deviation and interday relative standard deviation values (RSD, %) were summarized in Table 1. The LOD and LOQ were calculated according to The International Council for Harmonisation (ICH) of Technical Requirements for Pharmaceuticals for Human Use Harmonised tripartite guideline that validate analytical procedures. Calculation of LOD and LOQ was based on the standard deviation of the response and the slope of calibration curve. The intraday RSD % and interday RSD % values were calculated to determine the precision of the method by using 10 model solutions that contained 0.5 μg mL−1 of DKT. For the plasma samples, the LOD and the LOQ of developed method were calculated as 12.8 and 38.8 ng mL−1, respectively. The intraday and interday precision was observed 1.7% and 3.9%, respectively. The linearity was established across the 50−2000 ng/mL concentrations range and the coefficient of determination (r2) of ≥ 0.999.

Table 1 Analytical performances of the proposed method at model sample solution and plasma matrix

Accuracy and application of coacervative microextraction method

Accuracy of the developed coacervative microextraction method was proved by addition-recovery experiments for a whole-human plasma sample. Initially, blood plasma samples were divided into 4 portions per 1 mL aliquots; one aliquot was retained to provide a negative-control sample, while three aliquots were spiked with different amount of DKT per milliliter of plasma. Different amounts of dexketoprofen were added to plasma sample, and the developed coacervative microextraction method was applied these samples. The obtained results given in Table 2 showed that quantitative recoveries (97–100%) were obtained for plasma sample. The results proved that our method is applicable for accurate, rapid and sensitive analysis of DKT in plasma samples.

Table 2 Application of the coacervative microextraction method to plasma that spiked DKT (n = 5)

The changes in the concentration of DKT in the plasma of the male and female patients were analyzed by using the developed method. For this purpose, blood samples taken at different time periods from volunteer patients (a 23-year-old male and a 29-year-old female) that use 25 mg of DKT and different drugs and were subjected to our coacervative microextraction method. Then, the samples were analyzed with HPLC-DAD. Changes in the DKT concentration in the plasma samples are presented Fig. 7. The results showed that DKT concentration in plasma samples reached to maximum in 30 min, then decreased quickly and came to the point of exhaustion after 4 h with daily activities. The clinical study by Barbanoj et al. Barbanoj et al. 1998) was presented that the mean plasma dexketoprofen concentrations after a single oral dose of dexketoprofen trometamol 37 mg (corresponding to 25 mg of the acid), in 18 healthy volunteers were determined nearly 3.4 mg/L concentration of dexketoprofen. The results of second clinical search reported that the mean plasma dexketoprofen concentrations after a single oral dose of dexketoprofen 25 mg S (+) in 24 healthy volunteers found 3.10 ± 1.04 mg/L (Gich et al. 1995). The results of proposed method are suitable in literature according to mean plasma concentration.

Fig. 7
figure7

Mean dexketoprofen concentrations in female and male plasma samples after application of single doses 37 mg of dexketoprofen trometamol corresponding to 25 mg of dexketoprofen). (*<LOQ: under the limit of quantification of the proposed method) (n = 3)

The developed liquid phase microextraction method prior to HPLC-DAD analysis provided important advantages for the extraction of dexketoprofen in human plasma samples. The chromatographic analysis of plasma samples is shown in Fig. 8. The plasma samples that extracted our proposed method analyzed by HPLC-DAD and chromatographic analysis were completed in 7 min.

Fig. 8
figure8

The chromatographic analysis of plasma samples: A was the chromatogram of blank plasma sample; B, C, and D were the chromatogram of plasma samples that contains 0.25, 0.5, and 1.0 μg mL−1 DKP respectively

Conclusions

The developed reverse micelle-based coacervate liquid phase microextraction method prior to HPLC-DAD analysis provided an important strategy for the extraction of dexketoprofen in human plasma samples. The formation of nano- and micro-sized reverse micelle-based coacervate by ultrasonic vibration leads to the high-extraction efficiency for dexketoprofen. The most important feature of this method is that the changes in the concentration of dexketoprofen in the human plasma samples can be successfully monitored. The method is an environmentally friendly method because it does not require too much organic solvent. The amounts of THF (600 μL) and decanoic acid (200 mg) used to create the reverse micelle-based coacervates are very low. Because the extraction solvent does not need to be evaporated, direct extraction solvent analysis (at the microliter level) can be done by HPLC-DAD. Based on these advantages, this developed combination method consist of reverse micelle-based coacervate liquid phase microextraction, and HPLC-DAD analysis steps can be used as a practical and simple routine analysis method for monitoring of dexketoprofen in human plasma samples. As can be seen, the proposed method is comparable to other reported methods in which HPLC was applied as the determination and extraction method for dexketoprofen from human plasma according to Table 3.

Table 3 Comparison of the developed method with other extraction techniques in literature studies

Availability of data and materials

Not applicable

Abbreviations

DKT:

Dexketoprofen

HPLC-DAD:

High-performance liquid chromatography with photodiode-array detection

DA:

Decanoic acid:

EF:

Enrichment Factor

THF:

Tetrahydrofuran

LDA:

Linear dynamic range

LOD:

Limit of detection

LOQ:

Limit of quantification

RSD:

Relative standard deviation

NSAIDs:

Non-steroidal anti-inflammatory drugs

LLE:

Liquid-liquid extraction

SPE:

Solid phase extraction

LPME:

Liquid phase microextraction

ICH:

The International Council for Harmonisation

LC-MS-MS:

Liquid chromatography- tandem mass spectrometry

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Acknowledgements

The research project has been proved by Erciyes University Clinical Research’s Ethics.

Funding

This work has been supported by Erciyes University Scientific Research Projects Coordination Unit with research project TDK-2016-6823.

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Correspondence to İbrahim Narin.

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Yuvali, D., Yilmaz, E. & Narin, İ. A new liquid phase microextraction method-based reverse micelle for analysis of dexketoprofen in human plasma by HPLC-DAD. J Anal Sci Technol 11, 53 (2020). https://doi.org/10.1186/s40543-020-00251-5

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Keywords

  • Dexketoprofen
  • Determination
  • HPLC
  • Reverse micelle-based coacervates
  • Microextraction
  • Plasma
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