Abstract
Feather is the most abundant keratinous material in nature. This by-product of animal origin has about 80–90% of crude protein. This work aimed to maximize the enzymatic hydrolysis of feather meal using the proteolytic enzyme from Bacillus sp. P45 and evaluate the antioxidant capacity of different fractions of the hydrolysate. Enzymatic hydrolysis was maximized using a central composite rotatable design (CCRD) 24, where the effects of the variables CaCl2 concentration (0–100 mmol/L), temperature (35–55 °C), enzyme/substrate ratio (600–6000 U/g-protein), and substrate protein concentration (10–40 g/L) were estimated on the responses degree of hydrolysis (DH) and protein recovery (PR). The highest values of DH and PR were obtained when the hydrolysis was performed with 50 mmol/L of CaCl2, 50 °C, 6000 U/g-protein, and substrate protein concentration of 10 g/L. Hydrolysate presented DH of 8.4% and PR of 37.5% at 6 h of reaction. The obtained peptides were separated by molecular weight through a sequential ultrafiltration process in the membranes of 10 and 3 kDa, and the antioxidant activities of the different fractions were analyzed. The fraction < 3 kDa showed a higher capacity to sequester radicals ABTS⋅+ (90.20 μmol TE/g) and peroxyl (1892.47 μmol TE/g). This study shows the potential of Bacillus sp. P45 in hydrolyzing feather meal, resulting in peptides with antioxidant activity.
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Funding
This study was financed by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) grant code 001, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil) Grants 423285/2018-1, 304857/2018-1 and 308880/2021-8, and São Paulo Research Foundation (FAPESP, Brazil) Grant 01550-8/2018. The authors are also grateful to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Fundação de Amparo à pesquisa do Estado do Rio Grande do Sul (FAPERGS) for the scholarships.
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Material preparation, data collection, analysis, investigation, writing- original draft, review and editing and visualization were performed by ICC. Methodology, supervision and writing—review and editing were performed by ARCB. Methodology and writing—review and editing were performed by AB. Methodology and writing—review and editing and supervision were performed by LS. Conceptualization, writing—review and editing, methodology, supervision, project administration and funding acquisition were performed by SJK. All authors read and approved the final manuscript.
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da Cunha, I.C., Brandelli, A., Braga, A.R.C. et al. Feather Meal as a Source of Peptides with Antioxidant Activity from Enzymatic Hydrolysis. Waste Biomass Valor 14, 421–430 (2023). https://doi.org/10.1007/s12649-022-01886-8
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DOI: https://doi.org/10.1007/s12649-022-01886-8