Fig. 5
![Fig. 5](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12896-020-00659-2/MediaObjects/12896_2020_659_Fig5_HTML.png)
a Effect of temperature (30 – 80 °C) on keratinase activity. The optimal temperature for keratinase activity was determined to be in the range of 60 – 80 °C. b Determination of the thermostability of keratinase after 2 h of preheating at 50 °C, 60 °C and 70 °C