Characterization of a novel antioxidant peptide from feather keratin hydrolysates

•Feather keratin hydrolysates were produced with Chryseobacterium sp. kr6.•Peptides with antioxidant activity were partially purified.•Antioxidant properties were characterized by different methodologies.•Peptides were identified by mass spectrometry analysis and chemically synthesized.•The antioxid...

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Bibliographic Details
Published in:New biotechnology 2019-03, Vol.49, p.71-76
Main Authors: Fontoura, Roberta, Daroit, Daniel J., Corrêa, Ana Paula F., Moresco, Karla S., Santi, Lucélia, Beys-da-Silva, Walter O., Yates, John R., Moreira, José Cláudio F., Brandelli, Adriano
Format: Article
Language:English
Subjects:
Antioxidant activity
Antioxidants
Bioactive peptides
Chelation
Chryseobacterium
Cultivation
Electron transfer
Feather bioconversion
Feathers
Ferric ions
Free radicals
Gel-filtration chromatography
Hydrogen atoms
Hydrolysates
Hydroxyl radicals
Iron
Keratin
Lipid peroxidation
Lipids
Mass spectrometry
Mass spectroscopy
Organic chemistry
Peptides
Peroxidation
Protein hydrolysate
Scavenging
Sulfonic acid
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Summary:•Feather keratin hydrolysates were produced with Chryseobacterium sp. kr6.•Peptides with antioxidant activity were partially purified.•Antioxidant properties were characterized by different methodologies.•Peptides were identified by mass spectrometry analysis and chemically synthesized.•The antioxidant activity was confirmed for the peptide LPGPILSSFPQ. Feather hydrolysates were obtained through submerged cultivation of 50 g/L feathers with Chryseobacterium sp. kr6. Culture supernatants, displaying antioxidant properties, as evaluated by the 2,2′-azino-bis-(3-ethylbenzothiazoline)-6-sulfonic acid (ABTS) radical scavenging method, were partially purified by gel-filtration chromatography. Fractions showing scavenging activity were pooled, lyophilized and tested at different concentrations (0.1–1.0 mg/mL) by the total reactive antioxidant potential (TRAP) method, showing promising antioxidant capacities. Antioxidant activities of the partially purified feather hydrolysate (PPFH; 24.5 μg) were demonstrated by its ability to scavenge hydroxyl radicals and to inhibit lipid peroxidation. In addition, PPFH (0.24–24.5 μg) was found to reduce ferric ion (Fe3+), but did not display Fe2+-chelating activity. Thus, the main antioxidant activities could be related to the donation of hydrogen atoms, electron transfer and scavenging of hydroxyl radicals. PPFH was analyzed by mass spectrometry and five peptides were identified and chemically synthesized. The antioxidant activity of one peptide LPGPILSSFPQ was confirmed by ABTS and TRAP. The structure of this keratin-derived bioactive peptide has not been previously described.
ISSN:1871-6784
1876-4347
DOI:10.1016/j.nbt.2018.09.003