Rapid chromatographic technique for the determination of epsilon-aminocaproic acid in physiological fluids

Benzofurazan -based fluorophore for the spectrofluorimetric determination of 6-Aminocaproic acid: Application to spiked human plasma and urine

6-Aminocaproic acid is one of the most widely used antihemorrhagic and antifibrinolytic agent, therefore, it is essential to create a novel, sensitive, low cost and straightforward spectrofluorimetric method for its determination. The nucleophilic substitution interaction between the primary amine of 6-aminocaproic acid with 4-chloro-7-nitro benzofurazan (NBD-Cl) generated a yellow product. The reaction proceeded in borate buffer (pH 9) and its fluorescence has been measured at 525 nm after excitation at 472 nm. All of the parameters that have impact on the performance of the developed method were investigated and optimized. The range of linearity was 0.1-0.7 μg/mL while, the quantitation limit was down to 0.101 μg/mL and limit of detection was 0.033 μg/mL. This approach was effectively employed to evaluate the content of 6-aminocaproic acid in laboratory prepared dosage form with average percentage recovery of 100.19 ± 0.72% without any interference from basic excipients. Moreover, the proposed method was extended to determine 6-aminocaproic acid in spiked human plasma and urine.

An innovational validated spectrofluorimetric technique for determination of 6-Aminocaproic acid in pure form and its tablet: Application to spiked human plasma and urine

An innovative and sensitive spectrofluorimetric method has been developed for determination of 6-aminocaproic acid (ACA) in its pure form and its laboratory prepared tablets. The aim of this method is the reaction of ethyl acetoacetate and formaldehyde with the primary amino group presented in ACA as aimed in the Hantzsch reaction, this reaction resulted in formation of a yellow fluorescent dihydropyridine derivative that can be easily detected spectrofluorimetrically at 438 nm (excitation at 358 nm). At the optimum conditions of the reaction, the linear range was found to be (0.7-3.5 µg\mL) with limit of detection is 0.231 µg\mL and limit of quantitation is 0.700 µg\mL. The proposed method used for detection of ACA laboratory prepared tablets with average percentage 100.721 ± 0.701% without any interference from any excipients. This method used for in vitro determination of ACA in spiked human plasma with a percent mean recovery 99.874 ± 1.416%. In addition, the developed method used for determination of ACA in spiked human urine with percent mean recovery 100.314 ± 1.793%.

Determination of Epsilon Aminocaproic Acid Based on Charge Transfer Complexation with p-Nitrophenlol by Spectrophotometry

Introduction:

Spectrophotometry was investigated for the determination of epsilon aminocaproic acid (EACA) with p-nitrophenol (PNP). The method was based on Charge Transfer (CT) complexation of this drug as n-electron donor with π-acceptor PNP.

Methods:

The experiment indicated that CT complexation was carried out at room temperature for 10 minutes in dimethyl sulfoxide solvent. The spectrum obtained for EACA/PNP system showed the maximum absorption band at a wavelength of 425 nm. The stoichiometry of the CT complex was found to be a 1:1 ratio by Job’s method between the donor and the acceptor. Different variables affecting the complexation were carefully studied and optimized. At the optimum reaction conditions, Beer’s law was obeyed in a concentration limit of 1～6 μg mL-1. The relative standard deviation was less than 2.9%. The apparent molar absorptivity was determined to be 1.86×104 L mol-1cm-1 at 425 nm. The CT complexation was also confirmed by both FTIR and 1H NMR measurements.

Results:

The thermodynamic properties and reaction mechanism of the CT complexation have been discussed.

Conclusion:

The developed method could be applied successfully for the determination of the studied compound in its pharmaceutical dosage forms with good precision and accuracy compared to the official method comprising t- and F-tests.

Fluorescamine use in high-performance liquid chromatographic determination of aminocaproic acid in serum

A sensitive and specific high-performance liquid chromatographic determination of aminocaproic acid in serum is described. omega-Aminocaprylic acid is used as an internal standard. To 10 microliter of serum, 10 microliter of the internal standard solution and 50 microliter of ethanol are added. After centrifugation, a portion of the supernate is evaporated. The residue is dissolved in 750 microliter of 50 mM dibasic sodium phosphate, and then 250 microliter of fluorescamine in acetonitrile (35 mg/100 ml) is added. The reaction mixture is chromatographed using a column of octadecylsilane bonded to silica and 44% acetonitrile in 0.5 mM phosphoric acid as the eluent. Quantitation is achieved by monitoring either the absorbance of the effluent at 405 nm or the fluorescence of the compounds with a fluorometer equipped with a flowcell. The method is reproducible, simple, and fast and has a precision of 4.4%.