Abstract
Chicken feather waste is generally insufficiently utilized despite its high content of protein, constituting an environmental issue. Biodegradation of the waste with enabling microbes provides an advantageous option among the available solutions. In this study, an efficient whole feather–degrading strain was strategically isolated from a soil sample taken from a local tea plantation that has little or nothing to do with feathers. The strain was identified as Bacillus thuringiensis (designated as FDB-10) according to the cloned complete 16S rRNA sequence. The FDB-10 could efficiently degrade briefly heat-treated whole feather (102 °C, 5 min; up to 90% of a maximum concentration of 30 g/L) in a salt medium supplemented with 0.1 g/L yeast extract within 24 h (37 °C, 150 rpm). Addition of carbon sources (glycerol, glucose, starch, Tween 20, Tween 80, 1.25 g/L as glycerol) to the fermentation medium could improve the degradation. However, significant inhibition could be observed when the added carbon source reached the amount usually adopted in the investigation of carbon source preference (1%). Nitrogen source (NH4Cl, (NH4)2SO4, peptone) adversely influenced the performance of the strain. When the molar concentrations of NH4+ were equal for the two salt, the inhibitory effect on degradation of whole feathers was similar. Entirely different from other reported feather-degrading strains showing a preference to melanin-free feather substrates, the strain isolated in this study could degrade melanin-containing feather equally efficiently, and higher protease activity could be detected in the digest mix. As a plus, the strain could degrade feathers in rice wash produced in daily cooking, indicating its potential use in the simultaneous treatment of rice cooker wastewater produced by a rice processing plant. All these results imply that the FDB-10 is a strain with great potential in the biodegradation of feather waste.
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Funding
The publication of this article was supported financially by the Nanhu Scholars Program for Young Scholars of XYNU, Startup Program, and Key Program for Natural Science Exploration of XYNU (2017-ZDYY-160). Special thanks go to Dr. Sihe Zhang for her generous aid in amino acid analysis.
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Wang, T., Liang, C., Sun, Y. et al. Strategical isolation of efficient chicken feather–degrading bacterial strains from tea plantation soil sample. Int Microbiol 22, 227–237 (2019). https://doi.org/10.1007/s10123-018-00042-4
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DOI: https://doi.org/10.1007/s10123-018-00042-4