| 
              
              
              Open Access  
 
              
              
              
              Research 
              
              
(Published 
				online: 12-02-2017)  
              6. 
				
              Extraction of chitosan and its 
              oligomers from shrimp shell waste, their characterization and 
              antimicrobial effect -
              
              
              Tarun Kumar Varun, Swaraj Senani, 
              Natasha Jayapal, 
              Jayaram Chikkerur, Sohini Roy, 
              Vijay Bhasker Tekulapally, Mayank Gautam, 
              and Narender Kumar 
              
              Veterinary World, 10(2): 170-175   
              
   
                
                
doi: 
              
				
				10.14202/vetworld.2017.170-175 
                
                
                Tarun Kumar Varun:
                
              
                Department of 
                Animal Nutrition, ICAR-National Dairy Research Institute, Karnal, 
                Haryana, India. 
              
              Swaraj Senani:
              
              
              Department of 
              Animal Nutrition, ICAR-National Institute of Animal Nutrition and 
              Physiology, Adugodi, Bengaluru, Karnataka, India. 
              
              Natasha Jayapal:
              
              
              Department of 
              Animal Nutrition, ICAR-National Institute of Animal Nutrition and 
              Physiology, Adugodi, Bengaluru, Karnataka, India. 
              
              Jayaram Chikkerur:
              
              
              Department of 
              Animal Nutrition, ICAR-National Institute of Animal Nutrition and 
              Physiology, Adugodi, Bengaluru, Karnataka, India. 
              
              Sohini Roy:
              
              
              Department of 
              Animal Nutrition, ICAR-National Institute of Animal Nutrition and 
              Physiology, Adugodi, Bengaluru, Karnataka, India. 
              
              Vijay Bhasker Tekulapally:
              
              
              ICAR-Indian 
              Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, 
              India. 
              
              Mayank Gautam:
              
              
              Department of 
              Animal Nutrition, ICAR-National Dairy Research Institute, Karnal, 
              Haryana, India. 
              
              Narender Kumar:
              
              
              ICAR-Indian 
              Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, 
              India.   
              
              Received: 21-07-2016, Accepted: 31-12-2016, Published online: 
              12-02-2017   
				
              	
              	Corresponding author: 
              	
				Tarun Kumar Varun, 
                e-mail: dr.tkvarun@gmail.com 
 
              Citation: 
              Varun TK, Senani S, Jayapal N, Chikkerur J, Roy S, Tekulapally VB, 
              Gautam M, Kumar N (2017) Extraction of chitosan and its oligomers 
              from shrimp shell waste, their characterization and antimicrobial 
              effect, Veterinary World, 10(2): 170-175. 
 
              
				Abstract 
 
              Aim: 
              The present 
              study was performed to utilize the shrimp shell waste for chitin 
              and chitosan production, characterization by Fourier transform 
              infrared (FT-IR) technique and to evaluate the antimicrobial 
              effects of chitosan oligomers produced by depolymerization of 
              chitosan by nitrous acid.  
              Materials and 
              Methods: 
              Chitosan was 
              extracted from the shrimp shell waste by the chemical method and 
              characterized by FT-IR. Chitooligomers were produced by 
              depolymerising chitosan using nitrous acid, and the chitooligomers 
              were tested for antimicrobial effect against four gut pathogenic 
              organisms, i.e., Enterobacter aerogen (National Collection 
              of Dairy Culture [NCDC] 106), Enterococcus faecalis (NCDC 
              119), Escherichia coli (NCDC 134), and Staphylococcus 
              aureus (NCDC 109) by well diffusion method using Muller-Hinton 
              agar. A pure culture of pathogenic organisms was collected from 
              NCDC, ICAR-National Dairy Research Institute, Karnal.  
              Results: 
              Extracted 
              chitosan characterized by FT-IR and chitooligomers demonstrated 
              antimicrobial effect against four gut pathogenic organisms used in 
              this study. Zone of inhibitions (mm) were observed in E. 
              faecalis (13±0.20), E. coli (11.5±0.4), S. aureus
              (10.7±0.2), and E. aerogen (10.7±0.3). E. faecalis
              showed larger inhibition zone as compared to all other 
              organisms and inhibitions zones of E. aerogen and S. 
              aureus were comparable to each other.  
              Conclusion:
              Shrimp 
              waste can be utilized for chitosan production, and the 
              chitooligomers can be used as feed additive for gut health 
              enhancement and have potential to replace antibiotics from the 
              feed. Along with value addition pollutant load could be reduced by 
              waste utilization.  
              
              Keywords: 
              
              chitin, chitooligomers, chitosan, Fourier transform infrared, 
              shrimp waste. 
 
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