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| Author(s): |
Vinicius Adriano Coelho
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Ribeirão Preto. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Ciências Farmacêuticas de Ribeirão Preto (PCARP/BC) |
| Defense date: | 2014-07-21 |
| Examining board members: |
Fernando Barbosa Junior;
Andrés Dobal Campíglia;
Jonas Augusto Rizzato Paschoal
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| Advisor: | Fernando Barbosa Junior |
| Abstract | |
The Brazilian poultry industry has shown high rates of growth. In order to ensure greater efficiency of poultry production, veterinary drugs are administered for the treatment and prevention of diseases. Coccidiosis is one of those diseases, which is caused by various species of protozoa of the genus Eimeria. Polyether ionophore antibiotics are widely administered to control these microorganisms. Continuous administration of subtherapeutic doses of this class of drugs may result in the accumulation of residues at low concentration levels in the tissues of broiler. In order to ensure consumer safety, are set Maximum Residue Limits (MRLs) by international organizations such as Food and Drug Administration (FDA), Commission Regulation (EU), Codex Alimentarius; and national such as Ministério da Agricultura e Pecuária (MAPA). Thus, this study aimed to develop, validate and apply a simple method for determination of residues of Lasalocid (LAS), Monensin (MON), Salinomycin (SAL) and Narasin (NAR) in chicken meat by liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS). Nigericin (NIG) was used as qualitative internal standard. Samples were lyophilized, powdered and sieved. Particles size between 125 ?m and 250 ?m were used. Residues were extracted with methanol and aliquots of the extracts were evaporated and reconstituted for injection in the LC-ESI-MS/MS operated in positive selected reaction monitoring (SRM). From the molecular ion were obtained two fragment ions and that of higher relative abundance was used in quantification process. Clean-up step was performed by filtration on 0.22 ?m PTFE membrane. In the validation process, this method showed linearity over the concentration range from 0.0 to 40.0 ?g kg-1 for LAS; 0.0 to 20.0 ?g kg-1 for MON; 0.0 to 200.0 ?g kg-1 for SAL and 0.0 to 30.0 ?g kg-1 for NAR. For all antibiotics the coefficient of linear correlation (r) was in accordance with the guidelines for bioanalytical methods (r >= 0.99). The intra-day precision was evaluated at three spiked concentrations for each ionophore antibiotic and was determined in three consecutive days. Good inter-day precision was obtained, with relative standard deviations from 4.5% for NAR (22.5 ?g kg-1) and 15.2% for LAS (10.0 ?g kg-1). For all antibiotics recovery above 90.0% was obtained, which were 91.5% for LAS (10.0 ?g kg-1) and 99.1% for MON (15.0 ?g kg-1). Satisfactory results of decision limit (CC?) and detection capability (CC?) were determined, which were CC? 11.8 ?g kg-1 and 115.2 ?g kg-1 for MON and SAL, respectively; CC? 13.6 ?g kg-1 and 130.3 ?g kg-1 for the same drugs. The limit of detection (LD) and limit of quantification (LQ) were determined from data of the calibration curve. All the LQs were remarkably below the MLRs for each antibiotic. The method was applied to 18 samples acquired in Ribeirão Preto, SP. Of all analyzed samples only one exhibited traces of NAR with concentration above its respective LD. Thus, the proposed method can be applied in routine analysis on samples of commercial chicken meat. (AU) | |
| FAPESP's process: | 12/02511-0 - Development and application of a new extraction method for antibiotic residues in chicken meat and eggs |
| Grantee: | Vinicius Adriano Coelho |
| Support Opportunities: | Scholarships in Brazil - Master |