Abstract
Proteins in delimed tannery fleshings were fermentatively hydrolysed using Enterococcus faecium NCIM5335 and also hydrolysed using mild organic acids (formic acid and propionic acid). The liquor portion containing hydrolysed proteins was spray dried, in both the cases, to obtain a powder. The spray dried powder was evaluated for in vitro antioxidant activities with respect to scavenging different free radicals and antibacterial properties against nine different pathogens. Fermentation and acid hydrolysates scavenged 83 and 75.3% of 2,2-azino-bis-3-ethyl-benzthiazoline-6-sulphonic acid (ABTS) radicals, respectively, at a protein concentration of 0.25 mg. Further, fermentation hydrolysate showed higher 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity of 59% as compared to 56% scavenging by acid hydrolysate at a protein concentration of 5 mg. Acid hydrolysate exhibited lesser (82.3%) peroxy radical scavenging compared to hydrolysate from fermentation (88.2%) at a protein concentration of 10 mg. However, acid hydrolysate exhibited higher (89.2%) superoxide anion scavenging while its fermentation counterpart showed lower activity (85.4%) at 2.5 mg hydrolysate protein. Well as superoxide anion scavenging properties. All the in vitro antioxidant properties exhibited dose dependency. Fermentation hydrolysate exhibited maximum antagonistic activity against Salmonella typhi FB231, from among host of pathogens evaluated. Both the hydrolysates have potential to be ingredients in animal feeds and can help reduce oxidative stress in the animals.
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Abbreviations
- AAPH:
-
2,2′-azobis(2-methyl–propionamide)dihydrochloride
- ABTS:
-
2,2′-azino-bis-3-ethyl-benzthiazoline-6-sulphonicacid
- AH:
-
Acid hydrolysate
- BHI:
-
Brain heart infusion agar
- CFU:
-
Colony forming units
- DMW:
-
De-mineralized water
- DPPH:
-
2,2′-diphenyl-1-picrylhydrazyl
- GRAS:
-
Generally recognized as safe
- LAB:
-
Lactic acid bacteria
- LFH:
-
LAB fermented hydrolysate
- MRS Agar:
-
de Mann Rogosa and Sharpe agar
- PGR:
-
Pyrogallol red
- TF:
-
Tannery fleshings
- WWB:
-
Wet weight basis
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Acknowledgments
This study is supported by funding from Council of Scientific and Industrial Research (CSIR) through the network program (NWP-044) on Zero Emission Research Initiatives (ZERI). We thankfully acknowledge Masood Ahmed of M/s Mysore Super Reptiles Corporation, Bangalore, Karnataka, India for the gratis supply of limed TF. Authors thank Prakash V, Director, CFTRI, for encouragement and permission to publish this study.
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Balakrishnan, B., Prasad, B., Rai, A.K. et al. In vitro antioxidant and antibacterial properties of hydrolysed proteins of delimed tannery fleshings: comparison of acid hydrolysis and fermentation methods. Biodegradation 22, 287–295 (2011). https://doi.org/10.1007/s10532-010-9398-0
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DOI: https://doi.org/10.1007/s10532-010-9398-0