Effect of convection drying and lyophilization of fish myofibrillar proteins on the technological properties of biodegradable films

Abstract

This study aimed to verify the effects of different drying methods and temperatures of fish myofibrillar proteins (MPs), on the technological properties of biodegradable films. The MPs were dried by lyophilization at −60 °C for 48 h and by convective drying of hot air at 40 °C, 60 °C, and 80 °C. In the drying by convection, drying curves were constructed and the adjustments of mathematical models were evaluated. The films were formulated with 1.5% proteins (w/v) and 30% glycerol (w/w), and they were characterized. The drying times found were 540 min (40 °C), 300 min (60 °C), and 120 min (80 °C). The “Logarithmic” models followed by the “Diffusion approach” were the ones that best fit for all temperatures. The results of protein electrophoresis and the characterization of the film showed that the convective drying caused changes in the three-dimensional structure of the proteins, favoring the formation of a highly cross-linked protein network with numerous hydrogen bonds, hydrophobic interactions, and disulfide bonds, and generating films with properties equal to or better than lyophilized proteins.

Graphical Abstract

Keywords:

• Mathematical modeling
• drying curves
• electrophoresis and waste from the fish

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Correction

Disclosure statement

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

Correction statement

This article was originally published with errors, which have now been corrected in the online version. Please see Correction (http://dx.doi.org/10.1080/07373937.2021.1887411)

Additional information

Funding

This work was funded by the Coordination for the Improvement of Higher Education Personnel – Brazil (CAPES) [Financing code 001]; the National Council for Scientific and Technological Development – CNPq [project number 469101/2014]; and the Dean of Research and Graduate Studies (PROPESP) at the Federal University of Para.