Degradation of keratin substrates by keratinolytic fungi

Călin, Mariana; Constantinescu-Aruxandei, Diana; Alexandrescu, Elvira; Răut, Iuliana; Doni, Mihaela; Arsene, Melania-Liliana; Oancea, Florin; Jecu, Luiza; Lazăr, Veronica

doi:10.1016/j.ejbt.2017.05.007

Cited by 74 publications

(45 citation statements)

References 34 publications

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“…; Călin et al . ; Wilson ). The biological agents that can degrade keratin are the keratinolytic micro‐organisms and some insects (Tridico et al .…”

Section: Background To the Studymentioning

confidence: 99%

“…) and in vitro conditions (Călin et al . ), there is a relative paucity of studies on the effects of keratinolytic bacteria. A Bacillus subtilis strain was identified and isolated as a keratin‐degrading bacterium able to hydrolyse hard hair keratin (Mazotto et al .…”

Section: Background To the Studymentioning

confidence: 99%

“…Few biological organisms can break down and digest keratin because of their enzymatic keratinolytic equipment (keratinases enzymes) (Thompson et al 2014;Călin et al 2017;Wilson 2017). The biological agents that can degrade keratin are the keratinolytic micro-organisms and some insects (Tridico et al 2014) and their larvae stage from the families Dermistidae and Tineidae (Mazzarelli et al 2015).…”

Section: Biodegradative Changes In Human Scalp Hairsmentioning

confidence: 99%

“…This process of 'fungal tunnelling' is initially perpendicular to the longitudinal axis of the hair shaft, after which it can track laterally, disrupting the cortex and medulla Wilson 2017). Although the biodegradation of hair through the fungal lytic activity has been approached in natural (Bertrand et al 2014) and in vitro conditions (Călin et al 2017), there is a relative paucity of studies on the effects of keratinolytic bacteria. A Bacillus subtilis strain was identified and isolated as a keratin-degrading bacterium able to hydrolyse hard hair keratin (Mazotto et al 2010).…”

Section: Biodegradative Changes In Human Scalp Hairsmentioning

confidence: 99%

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Archaeological human hair in a burial context: Microscopical evaluation of samples from Iași, Romania (18th–19th centuries)

et al. 2020

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Owing to its resistance to degradation, hair is an important bio‐sample with unique properties used to study post mortem decompositional changes. The present paper is a microscopical approach to preserved human scalp hair discovered at the 18th–19th‐century archaeological site of Iași, Romania. The hair fibre alterations were assessed using optical microscopy, scanning electron microscopy, image analysis and hair histological scores. External alterations showed a statistically significant heterogeneous degradation. Image analysis results of the internal degradation of hairs were correlated to external lesions. The results consider the implication of intrinsic biological factors in the post mortem degradation of human hair preserved in graves with comparable environmental conditions.

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“…; Călin et al . ; Wilson ). The biological agents that can degrade keratin are the keratinolytic micro‐organisms and some insects (Tridico et al .…”

Section: Background To the Studymentioning

confidence: 99%

Section: Background To the Studymentioning

confidence: 99%

Section: Biodegradative Changes In Human Scalp Hairsmentioning

confidence: 99%

Section: Biodegradative Changes In Human Scalp Hairsmentioning

confidence: 99%

See 2 more Smart Citations

Archaeological human hair in a burial context: Microscopical evaluation of samples from Iași, Romania (18th–19th centuries)

et al. 2020

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“…Hence, it becomes necessary to source for an alternative economical protein sources for animal production most especially from the poultry wastes which are abundantly available in Nigeria (Adetunji and Adejumo 2017). This will go a long way, in the prevention of environmental pollution arising from the disposal of poultry feather wastes and their conversion into animal feeds (Khardenavis et al, 2009;Adejumo et al, 2016;Călin et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Production and evaluation of biodegraded feather meal using immobilised and crude enzyme from Bacillus subtilis on broiler chickens

Adejumo¹,

Adetunji²

2018

Braz. J. Biol. Sci.

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The management of solid wastes has been a major concern to many cities of the world due to daily increasing ruralurban migration and globalization. Due to a greater consumption of poultry meat, the disposal of feather wastes has contributed to the daily increasing environmental pollution. Agricultural wastes (such as poultry feathers) are disposed by burning, which consequently constitute environmental pollution and their chemical or mechanical conversion into animal feed normally leads to minimization of amino acids. The application of biotechnology through the utilisation of enzymes is considered an easy and inexpensive means of producing valuable products from poultry feather wastes. Bacillus subtilis was isolated from a dumping site and the plates were incubated on nutrient agar. The treatments containing 200 mL each of crude enzyme, immobilized enzyme and sterilized water were added to the bioreactor for biodegradation of chicken feathers. After hydrolysis, the feathers were dried and the products labelled microbial biodegraded feather meal. The effect of temperature, keratinolytic activity and the influence of the immobilised and crude enzyme-degraded feather meal on broiler chickens were assessed. The optimal activity and biodegradative potential of the keratinolytic enzyme was observed as 45 °C and 48 h after fermentation, respectively. The weight gain of the birds fed immobilised enzyme-degraded feather meal-based diet compared with the control. The enzymedegraded feather meal is safe for inclusion in broilers' diet and slight feeding manipulations could improve their performance.

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Optimization of feather degradation by a Bacillus thuringiensis isolate using response surface methodology and investigation of the feather protein hydrolysate structure

Elleboudy

Trabik

Aboulwafa

2023

Biotech and App Biochem

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Valorization of chicken feather is a long‐sought approach for its sustainable disposal. Being protein rich, hydrolyzed chicken feather has a wide range of applications, not limited to formulation of microbiological culture media, animal feed, and biofertilizers, but extends to synthesis of bioplastic films, cosmetics, and biomedicals. In this study, a potent keratinolytic isolate was recovered from soil and identified by 16S rRNA as Bacillus thuringiensis. Feather degradation by the isolate was optimized through response surface methodology. First, one‐variable‐at‐a‐time technique to assign the factors that affect feather degradation, then Box–Behnken central composite design model were employed. The model, involving three independent variables (initial pH, inoculum size, and concentration of supplementary glucose), was significant (R2 = 0.9716). According to the model, complete feather degradation is obtained at an inoculum size of B. thuringiensis B4 equal to 1 × 1010 CFU/ml, when feather meal broth is supplemented with 1.5% (w/v) glucose and pH adjusted to 8.5. Protein content of the lysate was 327.8 ± 25 μg/ml, and no carbohydrates were detected. SEM/EDX analysis has shown that the hydrolysate consisted mainly of O, P, S, and Se in addition to carbon, while FTIR images assured the presence of carboxyl and amino groups characteristic of peptides and amino acids.

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Degradation of keratin substrates by keratinolytic fungi

Cited by 74 publications

References 34 publications

Archaeological human hair in a burial context: Microscopical evaluation of samples from Iași, Romania (18th–19th centuries)

Archaeological human hair in a burial context: Microscopical evaluation of samples from Iași, Romania (18th–19th centuries)

Production and evaluation of biodegraded feather meal using immobilised and crude enzyme from Bacillus subtilis on broiler chickens

Optimization of feather degradation by a Bacillus thuringiensis isolate using response surface methodology and investigation of the feather protein hydrolysate structure

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