Journal
ELECTRONIC JOURNAL OF BIOTECHNOLOGY
Volume 28, Issue -, Pages 101-112Publisher
UNIV CATOLICA DE VALPARAISO
DOI: 10.1016/j.ejbt.2017.05.007
Keywords
Biodegradation; FTIR; Fungal species; Fusarium; Keratin degradation; Keratinases; Keratinolytic fungi; SEM; TGA
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Funding
- Ministry of National Education - Research Activity [PN 16.31.01.03, PN 16.31.03.04]
- NUCLEU Programme
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Background: The hydrolysis of keratin wastes by microorganisms is considered a biotechnological alternative for recycling and valorization through keratinolytic microorganisms. Despite their resistant structure, keratin wastes can be efficiently degraded by various microorganisms through the secretion of keratinases, which are promising enzymes for several applications, including detergents, fertilizers, and leather and textile industry. In an attempt to isolate keratinolytic microorganisms that can reach commercial exploitation as keratinase producers, the current work assesses the dynamics of keratin biodegradation by several keratinolytic fungal strains isolated from soil. The activity of fungal strains to degrade keratin substrates was evaluated by SEM, FTRIR-ATR spectra and TGA analysis. Results: SEM observations offered relevant information on interactions between microorganism and structural elements of hair strands. FTIR spectra of the bands at 1035-1075 cm(-1) assigned to sulfoxide bond appeared because of S-S bond breaking, which demonstrated the initiation of keratin biodegradation. According to TGA, in the second zone of thermal denaturation, where keratin degradation occurs, the highest weight loss of 71.10% was obtained for sample incubated with Fusarium sp. 1A. Conclusions: Among the tested strains, Fusarium sp. 1A was the most active organism in the degradation process with the strongest denaturation of polypeptide chains. Because keratinolytic microorganisms and their enzymes keratinases represent a subject of scientific and economic interest because of their capability to hydrolyze keratin, Fusarium sp. 1A was selected for further studies. (C) 2017 Pontificia Universidad Catolica de Valparaiso. Production and hosting by Elsevier B.V. All rights reserved.
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