Changes in cod muscle proteins during frozen storage revealed by proteome analysis and multivariate data analysis

Area of Science:

• Proteomics
• Biochemistry
• Food Science

Background:

• Understanding protein changes in cod muscle during storage is crucial for maintaining fish quality.
• Traditional methods struggle to capture complex protein alterations under various storage conditions.

Purpose of the Study:

• To apply multivariate data analysis with proteomics to identify protein changes in cod muscle during different storage conditions.
• To differentiate storage effects, particularly frozen storage duration, on cod muscle proteomes.

Main Methods:

• Two-dimensional gel electrophoresis (2-DE) to resolve cod muscle proteins.
• Principal Component Analysis (PCA) and Discriminant Partial Least Squares Regression (DPLSR) for data analysis.
• Mass spectrometry (MS/MS) for protein identification.

Main Results:

• PCA grouped samples by frozen storage time, but not by temperature or modified atmosphere chilling.
• DPLSR identified critical protein spots differentiating between 3, 6, and 12 months of frozen storage.
• Identified proteins include myosin light chains, actin fragments, and enzymes like triose-phosphate isomerase, showing concentration changes.

Conclusions:

• Combined proteomics and multivariate analysis effectively reveal storage-induced protein changes in cod.
• Specific protein alterations during frozen storage provide insights into biochemical degradation processes.
• This approach enhances knowledge of fish quality deterioration and aids in developing better preservation strategies.