ABSTRACT
Em julho de 2008, a ANVISA publicou um informe técnico esclarecendo um item importante da RE nº 1 (2005), que trata sobre os estudos de estabilidade de medicamentos. Este documento originou uma nova RDC de nº 58, publicada em dezembro de 2013, a qual estabelece limites para produtos de degradação em medicamentos. O objetivo do presente trabalho foi avaliar o comportamento do antineoplástico cloridrato de doxorrubicina frente a condições de decomposição (hidrólise ácida, básica, oxidação, temperatura e fotólise), a fim de se determinar suas principais vias de degradação e também elucidar as estruturas de seus principais produtos de degradação. Para isso foi desenvolvido e validado um método indicativo de estabilidade por HPLC-DAD-MS, o qual utiliza como fase estacionária uma coluna Luna C18(2) (150 mm x 3,0 mm, µm) com gradiente de fase móvel de tampão formiato de amônio 5 mmoles.L-1 pH 3 e metanol e fluxo de 0,3 mL.min-1. Ao longo do estudo foram encontrados diversos produtos de degradação, dentre eles a 7- deoxidehidrodoxorrubicinona, originada por hidrólise ácida e também o produto da degradação térmica de m/z 530, o qual foi encontrado nas análises do medicamento após expirado seu prazo de validade. Além disso, a avaliação da toxicidade in vitro de amostras contendo produtos de degradação de origem térmica indicou atividade citotóxica para células mononucleares
ANVISA has published in July 2008, a technical sheet expaining an important item of the RE No. 1 (2005), which describes drugs stability studies. This document originated a new RDC No. 58, published in December 2013, which sets thresholds for degradation products in pharmaceuticals. The aim of this study was to evaluate the behavior for the antineoplastic doxorubicin when exposed to stress conditions (acid and base hydrolysis, oxidaton, photolysis and temperature) in order to determine the major pathaways of degradation and also to elucidate the stuctures of their main degradation products. To this was developed and validated a target stability indicatinf method by HPLC-DAD-MS, with Luna C18 (2) (150 mm x 3.0 mm. 3 µm) column as stationary phase and a mobile phase gradient composed of ammonium formate buffer 5 mmoles.L-1 and pH 3 and metanol with flow of 0.3 ml min-1. Throughout the study many degradation products was discovered, among them 7- deoxydehydrodoxorubicinone, formed by acid hydrolysis and also the main product of termal decomposition of m/z 530, wich was found in the analyzes of the medicine after the expiry of its validity were found. Furthermore, evaluation of the in vitro toxicity of samples containing degradation products of thermal decomposition was found to be citotoxic for mononuclear cells
Subject(s)
Metabolism , Toxicity , Doxorubicin/analysis , Antineoplastic Agents , Mass Spectrometry , In Vitro Techniques/instrumentation , Chromatography, High Pressure Liquid/instrumentation , Drug StabilityABSTRACT
A nuclear magnetic resonance (1H NMR) method for the determination of beta-N-methylamino-L-alanine (L-BMAA) in environmental aqueous samples was developed and validated. L-BMAA is a neurotoxic modified amino acid that can be produced by cyanobacteria in aqueous environments. This toxin was extracted from samples by means of solid-phase extraction (SPE) and identified and quantified by 1H NMR without further derivatization steps. The lower limit of quantification (LLOQ) was 5 microg/mL. Good inter and intra-assay precision was also observed (relative standard deviation <8.5%) with the use of 4-nitro-DL-phenylalanine as an internal standard (IS). This method of 1H NMR analysis is not time consuming and can be readily utilized to monitor L-BMAA and confirm its presence in environmental and biological samples.
