Enzymatic hydrolysis of tuna skin collagen and gelatin produced peptide fractions with significantly higher antioxidant activity than the parent proteins, turning seafood waste into bioactive ingredients.
22.6% collagen yield from tuna skinEnzymatic hydrolysis produced peptides with higher antioxidant activity than parent collagen and gelatin
What the researchers found
Enzymatic hydrolysis of tuna skin collagen (52.7% degree of hydrolysis) and gelatin (45.2%) produced peptide fractions with significantly enhanced antioxidant activity across multiple molecular weight ranges.
Why it matters
Fish processing generates massive skin waste. Converting it to antioxidant collagen peptides creates value from waste while producing ingredients for functional foods and nutraceuticals.
The numbers in context
Collagen yield 22.6%; gelatin 20%; DH 52.7%/45.2%; collagen peptides 2.94-11.93 kDa; best antioxidant: <3, 3-10, 10-30 kDa fractions
How the study worked
In-vitro study extracting collagen (acetic acid) and gelatin (citric acid) from tuna skin, followed by Alcalase hydrolysis, molecular weight fractionation, and antioxidant activity measurement.
Who was studied
Yellowfin tuna skin collagen and gelatin extracted and hydrolyzed to peptides
What this study cannot tell us
In-vitro antioxidant assays only; no in-vivo or human data; specific peptide sequences not identified; bioavailability after oral consumption not tested.
How to read the evidence
Basic in-vitro characterization study demonstrating antioxidant activity of peptide fractions, but lacking specific peptide identification and in-vivo validation.
When this study was published
Published in 2020; marine collagen peptides continue to grow in the functional food and beauty supplement markets.
The bigger picture
This study connects sustainable seafood processing with the growing collagen peptide market, showing that waste streams can produce bioactive ingredients with health-promoting properties.
Questions still open
- Which specific peptide sequences in the tuna collagen hydrolysate are responsible for antioxidant activity?
- How does tuna collagen peptide antioxidant activity compare to other marine collagen sources?
- Would these peptides retain bioactivity after digestion and absorption in humans?
Common questions
Are fish collagen peptides good antioxidants?
Can tuna skin waste be used for supplements?
Read the original research
Characterization and Antioxidant Activity of Collagen, Gelatin, and the Derived Peptides from Yellowfin Tuna (Thunnus albacares) Skin.
Marine drugs, 18(2)
Citation
Nurilmala, Mala; Hizbullah, Hanifah Husein; Karnia, Euis; Kusumaningtyas, Eni; Ochiai, Yoshihiro. (2020). Characterization and Antioxidant Activity of Collagen, Gelatin, and the Derived Peptides from Yellowfin Tuna (Thunnus albacares) Skin.. Marine drugs, 18(2). https://doi.org/10.3390/md18020098