Nutritional improvement of feather protein by treatment with microbial keratinase

By Adriane Grazziotin, Fernanda A. Pimentel, E. V. Jong, A. Brandelli. 2006

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Rapid Conversion of Chicken Feather to Feather Meal Using Dimeric Keratinase from Bacillus licheniformis ER-15 (2012, methodology): “Further, pH of the mixture was adjusted to pH 8 by adding 2M sodium bicarbonate and 2mg/ml trypsin was added and incubated at 37°C for 16h [11].”
Keratinolytic proteases of Bacillus species isolated from the Amazon basin showing remarkable de-hairing activity (2007, unknown): “of feather keratin (Odetallah et al. 2003; Grazziotin et al. 2006).”
Sustainable Management of Keratin Waste Biomass: Applications and Future Perspectives (2016, background): “Feather degradation done by using microorganisms is cost effective and ecologically safe form of the continuously accumulated waste management (Grazziotin et al. 2006; Syed et al. 2009; Vasileva-Tonkova et al. 2009).”
Potential application spectrum of microbial proteases for clean and green industrial production (2017, background): “Conventional methods of feather processing are cost and energy intensive, involve harsh process conditions like high pressure and temperature and cause loss of nutritional value (Grazziotin et al. 2006).”
Alternative Methods of Preparation of Soluble Keratin from Chicken Feathers (2017, methodology): “The worldwide annual feather offal amounts to about 8 9 10(5) tonnes [2].”