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Bioactive peptides with radical scavenging and cancer cell cytotoxic activities derived from Flathead (Platycephalus fuscus) by-products

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Abstract

Peptide fractions extracted from Flathead by-products were evaluated for in vitro free radical scavenging and cancer cell cytotoxic activities. The degree of hydrolysis (DH), presence of protease and molecular weight (MW) influenced the 2,2-diphenyl-1-pycryl-hydrazyl (DPPH) and 2,2-azino-bis-3-ethylbenzothiazoline-6-sulphonic (ABTS) radical scavenging activities (RSA) of Flathead peptide fraction. Low MW peptides (<3 kDa), obtained from overnight incubation with added an exogenous protease, significantly inhibited free radicals and showed the highest RSA of 94.03 and 82.89 % against DPPH· and ABTS·+, respectively. The presence of bioactive peptides during H2O2 exposure increased viability of T4056 normal cells. Furthermore, peptide fractions <3 kDa inhibited the growth of HT-29 colon cancer cells up to 91.04 %, although the activity was found to be non-selective. Further purification revealed a novel peptide, Met-Gly-Pro-Pro-Gly-Leu-Ala-Gly-Ala-Pro-Gly-Glu-Ala-Gly-Arg, with RSA properties. These results indicated that peptides extracted from Flathead by-products have a potential to be used as natural antioxidants and/or chemo-protective agents.

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Abbreviations

ABTS:

2,2-Azino-bis-3-ethylbenzothiazoline-6-sulphonic

AFP:

Acid fungal protease

DH:

Degree of hydrolysis

DPPH:

2,2-Diphenyl-1-pycryl-hydrazyl

FPH:

Fish protein hydrolysate

MW:

Molecular weight

MWCO:

Molecular weight cut off

ON:

Incubated overnight without the addition of AFP

ONE:

Incubated overnight with the addition of AFP

ROS:

Reactive oxygen species

RSA:

Radical scavenging activity

UF:

Unfractionated

UH:

Unhydrolysed/Control

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Acknowledgments

We are gratefully acknowledged the Indonesian Department of Higher Education (DIKTI) for providing financial support and Barwon Foods, Geelong, for supplying the fish samples. The authors acknowledge with gratitude the assistance of Dr. David Steer for peptide identification.

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Correspondence to Osaana N. Donkor.

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Nurdiani, R., Vasiljevic, T., Yeager, T. et al. Bioactive peptides with radical scavenging and cancer cell cytotoxic activities derived from Flathead (Platycephalus fuscus) by-products. Eur Food Res Technol 243, 627–637 (2017). https://doi.org/10.1007/s00217-016-2776-z

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