Valorisation of keratinous wastes: A sustainable approach towards a circular economy

Ossai, Innocent Chukwunonso; Hamid, Fauziah Shahul; Hassan, Auwalu

doi:10.1016/j.wasman.2022.07.021

Cited by 41 publications

(8 citation statements)

References 190 publications

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“…Keratinous substances like horns, hair, feathers, etc. have received particular focus among these protein residues, it is not thought to be environmentally friendly when disposed of using harmful procedures like acid/alkaline hydrolysis or incineration ( Ossai et al, 2022 ; Peydayesh et al, 2022 ). Under moderate circumstances, keratin can be broken down by microbial keratinolytic enzymes, producing keratin hydrolyzed products that nevertheless contain intact amino acids & peptides, the quest for fungal & bacterial genera that can effectively manufacture keratinases might help to ensure the sustainability of business because of the relevance of these enzymes to science and their potential application in green technologies ( de Menezes et al, 2021 ).…”

Section: Potential Applications Of Keratinolytic Enzymes In Poultry F...mentioning

confidence: 99%

Molecular strategies to enhance the keratinase gene expression and its potential implications in poultry feed industry

Saeed,

Yan,

et al. 2024

Poultry Science

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Section: Potential Applications Of Keratinolytic Enzymes In Poultry F...mentioning

confidence: 99%

Molecular strategies to enhance the keratinase gene expression and its potential implications in poultry feed industry

Saeed,

Yan,

et al. 2024

Poultry Science

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“…The abundance of keratinous wastes as feedstock from the agro‐industrial processing, wool processing, and grooming industries can be beneficial in terms of keratin extraction, which may be the best solution for developing an environmentally and economically sustainable keratin‐based economy. The transition from the current harmful process that ends energy and resource recovery through incineration and landfilling to the environment‐friendly model, a more sustainable and closed‐loop recycling and recovery approach that will minimise pollution, disposal challenges, and loss of valuable bioresources [ 180 ].…”

Section: Keratinmentioning

confidence: 99%

Recent trends in nanocomposite packaging films utilising waste generated biopolymers: Industrial symbiosis and its implication in sustainability

Tabassum

Mohan

Mamidi

et al. 2023

IET Nanobiotechnology

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Uncontrolled waste generation and management difficulties are causing chaos in the ecosystem. Although it is vital to ease environmental pressures, right now there is no such practical strategy available for the treatment or utilisation of waste material. Because the Earth's resources are limited, a long‐term, sustainable, and sensible solution is necessary. Currently waste material has drawn a lot of attention as a renewable resource. Utilisation of residual biomass leftovers appears as a green and sustainable approach to lessen the waste burden on Earth while meeting the demand for bio‐based goods. Several biopolymers are available from renewable waste sources that have the potential to be used in a variety of industries for a wide range of applications. Natural and synthetic biopolymers have significant advantages over petroleum‐based polymers in terms of cost‐effectiveness, environmental friendliness, and user‐friendliness. Using waste as a raw material through industrial symbiosis should be taken into account as one of the strategies to achieve more economic and environmental value through inter‐firm collaboration on the path to a near‐zero waste society. This review extensively explores the different biopolymers which can be extracted from several waste material sources and that further have potential applications in food packaging industries to enhance the shelf life of perishables. This review‐based study also provides key insights into the different strategies and techniques that have been developed recently to extract biopolymers from different waste byproducts and their feasibility in practical applications for the food packaging business.

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“…On a global scale, around 2 million tons of feathers are produced each year as a byproduct of the poultry industry. Feathers consist of over 85% beta-keratin, along with 70% amino acids, vitamins, high-value elements, and other growth factors [3][4][5]. This composition underscores the potential use of feathers as animal feed and biofertilizers [6,7].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Transcriptome Analysis Unveils the Mechanisms of Response in Feather Degradation by Pseudomonas aeruginosa Gxun-7

Song,

Liu,

Yin

et al. 2024

Microorganisms

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Microbial degradation of feathers offers potential for bioremediation, yet the microbial response mechanisms warrant additional investigation. In prior work, Pseudomonas aeruginosa Gxun-7, which demonstrated robust degradation of feathers at elevated concentrations, was isolated. However, the molecular mechanism of this degradation remains only partially understood. To investigate this, we used RNA sequencing (RNA-seq) to examine the genes that were expressed differentially in P. aeruginosa Gxun-7 when exposed to 25 g/L of feather substrate. The RNA-seq analysis identified 5571 differentially expressed genes; of these, 795 were upregulated and 603 were downregulated. Upregulated genes primarily participated in proteolysis, amino acid, and pyruvate metabolism. Genes encoding proteases, as well as those involved in sulfur metabolism, phenazine synthesis, and type VI secretion systems, were notably elevated, highlighting their crucial function in feather decomposition. Integration of Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) taxonomies, combined with a review of the literature, led us to propose that metabolic feather degradation involves environmental activation, reducing agent secretion, protease release, peptide/amino acid uptake, and metabolic processes. Sulfite has emerged as a critical activator of keratinase catalysis, while cysteine serves as a regulatory mediator. qRT–PCR assay results for 11 selected gene subset corroborated the RNA-seq findings. This study enhances our understanding of the transcriptomic responses of P. aeruginosa Gxun-7 to feather degradation and offers insights into potential degradation mechanisms, thereby aiding in the formulation of effective feather waste management strategies in poultry farming.

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Valorisation of keratinous wastes: A sustainable approach towards a circular economy

Cited by 41 publications

References 190 publications

Molecular strategies to enhance the keratinase gene expression and its potential implications in poultry feed industry

Molecular strategies to enhance the keratinase gene expression and its potential implications in poultry feed industry

Recent trends in nanocomposite packaging films utilising waste generated biopolymers: Industrial symbiosis and its implication in sustainability

A Comparative Transcriptome Analysis Unveils the Mechanisms of Response in Feather Degradation by Pseudomonas aeruginosa Gxun-7

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