Odor-active volatile compounds profile of triploid rainbow trout with different marketable sizes

Abstract

The present study identified the volatile compounds profile in raw muscle of triploid rainbow trout with different marketable sizes (eviscerated weight: 2 kg, 3 kg and 4 kg, respectively). Six fish per each size treatment were sampled in a local commercial trout farm, then raw muscles of sampled fish were filleted to detect the volatile compounds by using the gas chromatography-mass spectrometry (GCMS) analysis coupled with automated solid-phase microextraction (SPME) system. Results showed that a total of 58 volatile compounds were identified in raw muscle of triploid rainbow trout, including aldehydes (20 species), ketones (6 species), alcohols (9 species), hydrocarbons (11 species), aromatics (6 species) and miscellaneous compounds groups (6 species). The subtotal estimated concentration of aldehydes group was significantly higher than those of the other volatile groups (P 0.05). Based on the principle component analysis and cluster analysis using the odor activity values of 21 odor-active compounds, the overall odors of raw muscle might be similar in triploid rainbow trout with different marketable sizes.

Keywords

• Triploid rainbow trout
• Body size
• Odor activity value (OAV)
• Fish odor