Impact of Dehydration Processing on Scallop (Patinopecten yessoensis) Adductor Muscle: Structural and Oxidative Insights

This study investigated the impact of four drying techniques-hot air drying (HAD), vacuum hot air drying (VFAD), microwave drying (MWD), and vacuum freeze-drying (VFD)-on the structural, physicochemical, and functional properties of scallop adductor muscles, a critical marine resource in the food industry. The results demonstrated that VFD optimally preserved the ultrastructural integrity of the tissue, maintaining its surface fibrous architecture and achieving a superior recovery ration (78%) and rehydration ration (186.5%) compared to HAD, VFAD, and MWD. While the zeta potential remained statistically invariant across methods, HAD induced the largest particle agglomeration, followed by MWD. Notably, VFD enhanced protein stability, increasing the sulfhydryl content by 163.2% and reducing carbonyl formation by 48.1% relative to HAD, whereas MWD had the opposite effect. Multispectral analyses revealed the severe disruption of protein secondary and tertiary structures after MWD, while VFD minimized conformational denaturation. Statistical modeling ranked the drying sensitivity parameters as follows: surface hydrophobicity > hardness> β-turn content > dityrosine crosslinking > transverse relaxation time T23. These findings underscore VFD as the optimal method for mitigating structural degradation and oxidative damage in scallop processing, providing actionable insights to enhance the technofunctional quality of shelf-stable scallop products.