Ultrasound-Mediated Technique for Facilitating Collagen Recovery from Yellowfin (Thunnus albacares) Skin: Insight into the Structure, Functional and Antioxidant Specification

ABSTRACT

The highest yield (34%) and imino acid (18.7%) of collagen were obtained from yellowfin tuna (Thunnus albacares) skin using 20 min ultrasound. The collagen was identified as type I collagen according to the results of sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), and its structure remained intact, proved by ultraviolet spectroscopy (UV) and fourier transform infrared spectroscopy (FTIR). Collagen solubility was superior in acidic and low salt environments. Ultrasound cavitation for 20 min improved collagens’ emulsifying (EAI: 78.8 m2/g and ESI: 110.3 min) and foam properties (FA: 151.8% and FS: 133.3%) and water holding capacity (51.9%) by enhancing internal hydrophobic interactions and surface hydrophobicity. 20 min ultrasound resulted in desirable DPPH (61.1%) and ABTS (53.1%) radical scavenging and ferric-reducing antioxidant power (0.078 ABS).

Graphical abstract

KEYWORDS:

• Fish skin
• yellowfin tuna (Thunnus albacares)
• ultrasound-treated collagen
• functional properties
• antioxidant attributes

Highlights

• Yellowfin waste was exploited for collagen recovery

• Ultrasound cavitation promoted the yield of collagen

• Ultrasound-treated collagens exhibited desirable viscosity and thermal stability

• Prolonged ultrasound power resulted in effectual functional and antioxidant attributes

Acknowledgments

The authors express their acknowledgment to the Tarbiat Modares University, Iran for funding support (IG-39804).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Author contributions

Mahshid Gharib Heidari carried out the experimental tasks including the extraction process, characterization and evaluations, data analyzing, and writing the article. Masoud Rezai represented all required support in whole aspects of the investigation such as samples and chemicals providing, designing the experiments, editing the article, and providing funds from the mentioned faculty. Samaneh Pezeshk also cooperated in selecting the subject of the investigation and designing the experiments.

Data availability statement

Data will be made available on request.