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Production and characterization of keratinase by Ochrobactrum intermedium for feather keratin utilization.

Abstract：

:A newly isolated bacterium producing 55.5 U/mL keratinase on feather meal minimal medium was identified as Ochrobactrum intermedium. Optimization of process parameters by one-variable-at-a-time (OVAT) approach (substrate concentration 0.5% w/v, inoculum size 5% w/v, pH 7.0, 200 rpm for 96 h at 40 °C) resulted in 2.1-fold increase in keratinase secretion (117 U/mL). Keratinase was optimally active at pH 9.0 and 40 °C and was stable at pH 9.0 and 60 °C for 120 min. Calcium ions enhanced keratinase activity (158%) significantly, while it was strongly inhibited by both PMSF and EDTA, indicating it to be a metallo-serine protease. Keratinase degraded native chicken feathers efficiently resulting in 97.9% weight loss along with release of 745.5 μg/mL soluble proteins and 4196.69 μg/mL amino acids. Feather hydrolysate generated by NKIS 1 exhibited significant anti-oxidant and free-radical scavenging activity (90.46%). The present study revealed that O. intermedium NKIS 1 has potential applications in the biodegradation of chicken feathers and the value-addition of poultry waste.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Sharma I,Kango N

doi

10.1016/j.ijbiomac.2020.10.260

subject

Has Abstract

pub_date

2021-01-01 00:00:00

pages

1046-1056

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(20)34913-8

journal_volume

166

pub_type

杂志文章

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