Monitoring the lipid oxidation and flavor of Russian sturgeon fillets treated with low temperature vacuum heating: formation and relationship
2022
Shen, Shi‐Ke | Wu, Zheng‐Yang | Chen, Yue‐Wen | Dong, Xiu‐Ping | Liu, Fei‐Jian | Ding, Zhi‐Wen
BACKGROUND: Sturgeon is one of the most precious fish resources worldwide. Low temperature vacuum heating (LTVH) has been confirmed as a good way of maintaining food quality. However, there is a lack of in‐depth studies assessing the impact of LTVH on lipid oxidation and flavor formation. RESULTS: The present study compared the effect of LTVH and traditional cooking on lipid oxidation and flavor of sturgeon fillets. In total, 13 fatty acids were detected, of which polyunsaturated fatty acids content was the highest (P < 0.05). LTVH prevented the formation of conjugated diene and thiobarbituric acid reactive substances (P < 0.05), as manifested by an increased signal intensity of free radicals of electron spin resonance. The characteristic peaks intensity of lipid by Raman at 970 cm⁻¹, 1080 cm⁻¹ and 1655 cm⁻¹ were reduced, whereas peaks at 1068 cm⁻¹ and 1125 cm⁻¹ displayed the opposite trend. Confocal fluorescence microscopy showed that the lipids particles were reduced and distributed more evenly with an increase in heating temperature. Principal component analysis of electronic nose cannot effectively separate all groups; however, gas chromatography‐ion migration spectrometry showed that the volatile flavor compounds were relatively stable during LTVH. Correlation analysis of all the above lipid oxidation indices and characteristic flavor substances showed that each treatment group was located in different quadrants and demonstrated great differentiation. CONCLUSION: Overall, the results of the present study support the view that LTVH is a healthier way of cooking. © 2022 Society of Chemical Industry
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