Valorization of keratin based waste

Holkar, Chandrakant R.; Jain, Saransh S.; Jadhav, Ananda J.; Pinjari, Dipak V.

doi:10.1016/j.psep.2017.08.045

Cited by 72 publications

(42 citation statements)

References 85 publications

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“…Keratins are proteins that can be sourced from the skin, hair, horns, nails, beaks, and teeth of different mammals, reptiles, birds, and fish (Mckittrick et al, 2012), and constitute a significant biowaste stream (Zoccola et al, 2009; Sharma and Gupta, 2016; Holkar et al, 2018). As a natural fiber, wool is widely used commercially in the textile industry (Lewis and Rippon, 2013), and has found many uses ranging from biomedical and cosmetic applications (Rouse and Van Dyke, 2010; Silva et al, 2014; Sharma and Gupta, 2016), (being documented in medical use at least since ancient Greek times) (Alves et al, 2013), to fertilizers and flame retardants (Sharma and Gupta, 2016).…”

Section: Structural Proteinsmentioning

confidence: 99%

Proteins in Ionic Liquids: Reactions, Applications, and Futures

et al. 2019

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Biopolymer processing and handling is greatly facilitated by the use of ionic liquids, given the increased solubility, and in some cases, structural stability imparted to these molecules. Focussing on proteins, we highlight here not just the key drivers behind protein-ionic liquid interactions that facilitate these functionalities, but address relevant current and potential applications of protein-ionic liquid interactions, including areas of future interest.

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Section: Structural Proteinsmentioning

confidence: 99%

Proteins in Ionic Liquids: Reactions, Applications, and Futures

et al. 2019

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“…properties (Holkar et al 2018). This explains why chicken feathers are more easily degraded than swine hair.…”

Section: Evaluation Of Keratin Residue Degradationmentioning

confidence: 99%

Reactional Ultrasonic Systems And Microwave Irradiation For Pretreatment Of Agro-Industrial Waste To Increase Enzymatic Activity

Czapela

Kubeneck

Preczeski

et al. 2020

Preprint

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Pretreatment of keratinous residues using an ultrasonic reaction system provides greater enzymatic production in less time. This is a promising technology for measuring enzyme activity and microwave processes. In the present work, an ultrasonic probe reaction system was used to evaluate the potential of swine hair pretreatment. The pretreated material was submerged with non-pretreated residues for 9 days to obtain the enzyme. Enzyme activity was measured in the extracts obtained using the ultrasonic probe, ultrasonic bath, and microwave. We also used the enzymatic concentration technique with NaCl and acetone. Homemade enzymatic extracts were evaluated for their ability to degrade swine hair and chicken feathers by comparing them with the activities commercial enzymes. Macrobeads gave greater energy dissipation in less time, providing greater enzyme activity (50.8 U/mL over 3 days). In terms of waste degradation, non-pretreated swine hair was more promising. The ultrasonic probe reaction system had the potential to evaluate increased enzyme activity (38.4% relative activity) and the enzyme concentration increased activity by 53.5%. The homemade enzymatic extract showed promise for degradation of keratinous residues.

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“…However, α-keratin present in the swine hair structure has large amounts of sulfur, which confers highly resistant mechanical properties (Holkar et al 2018). This explains why chicken feathers are more easily degraded than swine hair.…”

Section: Evaluation Of Keratin Residue Degradationmentioning

confidence: 99%

Reactional Ultrasonic Systems And Microwave Irradiation For Pretreatment Of Agro-Industrial Waste To Increase Enzymatic Activity

Czapela

Kubeneck

Preczeski

et al. 2020

Preprint

View full text Add to dashboard Cite

Keratinous residues are generated in large quantities in industrial processes and because of this they are difficult to manage because the presence of keratin. Keratinases are emerging as promising alternatives in technological processes. The objective of this work was to determine the potential of pretreatment of agro-industrial residues using an ultrasonic probe, and to evaluate activity enhancement strategies by analyzing the behavior of enzymatic activity of keratinases exposed to various reaction systems as well as to enzymatic concentration. We tested the application of enzymatic extracts in the degradation of keratinous residues. Submerged fermentation was performed with swine hair pretreated with and without ultrasonic probe. The enzymatic extracts were exposed to reaction systems and the enzymatic concentration technique to measure the increments of enzymatic activity. We found that the ultrasonic probe increased reaction rates, enabling higher enzyme production in shorter time periods. The ultrasonic probe reached 38.4% of relative activity and the enzyme concentration, increased the enzymatic activity in 53.5%. We observed potential degradation of chicken feathers with homemade enzyme extracts. Taken together, our findings suggest that the results obtained in this work are promising, despite the fact that the data in this area are scarce.

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Valorization of keratin based waste

Cited by 72 publications

References 85 publications

Proteins in Ionic Liquids: Reactions, Applications, and Futures

Proteins in Ionic Liquids: Reactions, Applications, and Futures

Reactional Ultrasonic Systems And Microwave Irradiation For Pretreatment Of Agro-Industrial Waste To Increase Enzymatic Activity

Reactional Ultrasonic Systems And Microwave Irradiation For Pretreatment Of Agro-Industrial Waste To Increase Enzymatic Activity

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