| 
              
              
              Open Access  
 
              
              
              
              Research 
              
              
(Published 
				online: 09-09-2016)  
              5. 
				
				Screening of antibiotics and 
				chemical analysis of penicillin residue in fresh milk and 
				traditional dairy products in Oyo state, Nigeria -
				
				
				Isaac Olufemi Olatoye, Oluwayemisi Folashade Daniel
				
				
				and Sunday Ayobami Ishola 
              
              Veterinary World, 9(9): 948-954   
              
   
                
                
doi: 
              
				
				10.14202/vetworld.2016.948-954 
                
				  
				
				Isaac Olufemi Olatoye:
				
              
              	Pathogenomic and 
				Proteomic Laboratory, Paul Allen School for Global Animal 
				Health, College of Veterinary Medicine, Washington State 
				University, Pullman, Washington, USA; Department of Veterinary 
				Public Health and Preventive Medicine, University of Ibadan, 
				Ibadan, Nigeria; olatoye@vetmed.wsu.edu 
				
				Oluwayemisi Folashade Daniel:
				
              
              Department of 
				Veterinary Public Health and Preventive Medicine, University of 
				Ibadan, Ibadan, Nigeria; folashadedaniels@gmail.com 
				
				Sunday Ayobami Ishola:
				
              
              Analytical 
				Laboratory, Nigerian Institute of Science Laboratory Technology, 
				Ibadan, Nigeria; Department of Chemistry, College of Arts and 
				Science, Washington State University, Pullman, Washington, USA; 
				techjoyadisco@yahoo.com   
				
				Received: 07-04-2016, Accepted: 26-07-2016, Published online: 
				09-09-2016   
				
              	
              	Corresponding author: 
              	Isaac 
				Olufemi Olatoye, e-mail: olatoye@vetmed.wsu.edu 
 
              Citation: 
				Olatoye IO, Daniel OF, Ishola SA (2016) Screening of antibiotics 
				and chemical analysis of penicillin residue in fresh milk and 
				traditional dairy products in Oyo state, Nigeria, Veterinary 
				World, 9(9): 948-954. 
 
              
				Abstract 
 
				Background and 
				Aim: 
				There are global public health and economic concerns on chemical 
				residues in food of animal origin. The use of antibiotics in 
				dairy cattle for the treatment of diseases such as mastitis has 
				contributed to the presence of residues in dairy products. 
				Penicillin residues as low as 1 ppb can lead to allergic 
				reactions and shift of resistance patterns in microbial 
				population as well as interfere with the processing of several 
				dairy products. Antibiotic monitoring is an essential quality 
				control measure in safe milk production. This study was aimed at 
				determining antibiotic residue contamination and the level of 
				penicillin in dairy products from Fulani cattle herds in Oyo 
				State.  
				Materials and 
				Methods: 
				The presence of 
				antibiotic residues in 328 samples of fresh milk, 180 local 
				cheese (wara), and 90 fermented milk (nono) from Southwest, 
				Nigeria were determined using Premi®
				test kit (R-Biopharm AG, Germany) followed by 
				high-performance liquid chromatography analysis of penicillin-G 
				residue.  
				Results:
				
				Antibiotic residues were obtained in 40.8%, 24.4% and 62.3% 
				fresh milk, wara and nono, respectively. Penicillin-G residue 
				was also detected in 41.1% fresh milk, 40.2% nono and 24.4% wara 
				at mean concentrations of 15.22±0.61, 8.24±0.50 and 7.6±0.60 μg/L 
				with 39.3%, 36.7% and 21.1%, respectively, containing penicillin 
				residue above recommended Codex maximum residue limit (MRL) of 5 
				μg/L in dairy. There was no significant difference between the 
				mean penicillin residues in all the dairy products in this 
				study.  
				Conclusion:
				The 
				results are of food safety concern since the bulk of the samples 
				and substantial quantities of dairy products in Oyo state 
				contained violative levels of antibiotic residues including 
				penicillin residues in concentrations above the MRL. This could 
				be due to indiscriminate and unregulated administration of 
				antibiotics to dairy cattle. Regulatory control of antibiotic 
				use, rapid screening of milk and dairy farmers’ extension 
				education on alternatives to antibiotic prophylaxis, veterinary 
				prescriptions and withdrawal periods are recommended to prevent 
				residues.  
				
				Keywords: 
				
				milk and milk products, Oyo state, penicillin residues, public 
				health. 
 
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