Abstract
The quality attributes, descriptive sensory characteristics, and muscle proteomes (sarcoplasmic and myofibrillar) of normal and reddish channel catfish (Ictalurus punctatus) fillets were evaluated. Reddish fillets had greater (p<0.05) a(redness) and b(yellowness) values and lower L(lightness) (p<0.05) than normal ones, but no differences existed (p>0.05) in cooking loss and instrumental texture. The reddish fillets were more (p<0.05) bitter, earthy, grassy, metallic, and oxidized, and had more off-flavor than normal ones, but was less (p<0.05) sweet and juicy than normal fillets. Profiling of muscle proteomes employing two-dimensional electrophoresis and mass spectrometry identified several myofibrillar and sarcoplasmic proteins. The sarcoplasmic proteome revealed differential abundance of the beta subunit of hemoglobin, which was over-abundant (p<0.05) in reddish fillets. On the other hand, no differences (p>0.05) were observed in the abundance of myofibrillar proteome components. The results indicated that the occurrence of red color defect in catfish fillets is primarily due to the over-abundance of hemoglobin.
| Original language | English |
|---|---|
| Pages (from-to) | 141-148 |
| Number of pages | 8 |
| Journal | LWT |
| Volume | 57 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jun 2014 |
Bibliographical note
Funding Information:The mass spectrometric analysis was performed at the University of Kentucky's Center for Structural Biology Protein Core Facility, supported in part by funds from the National Institute of Health's National Center for Research Resources Grant P20 RR020171 .
Keywords
- Channel catfish
- Color
- Fillet quality
- Myofibrillar proteome
- Sarcoplasmic proteome
ASJC Scopus subject areas
- Food Science