Effects of Different Extraction Processes on the Physicochemical Properties and Volatile Flavor Compounds of Chicken Oil

To investigate the effects of different extraction processes on the physicochemical properties and volatile flavor compounds of chicken oil. This study used three different extraction processes, namely dry, wet, and microwave, to extract chicken oil. The physicochemical properties of chicken oil extracted by different processes were comprehensively compared. At the same time, the volatile substance composition was determined by headspace gas chromatography-mass spectrometry, and the key volatile flavor component composition differences in chicken oil extracted by different processes were established by combining relative odor activity values, principal component analysis, and cluster analysis. The results showed that the chicken oil cooked by dry method had the lowest brightness, a redder and yellower color, and a lower content of malondialdehyde. Wet cooking chicken oil had the highest brightness, a greenish or yellowish color, and a lower acid value. The chicken oil cooked by microwave had a slightly darker brightness, lighter yellow and red, higher extraction rate, better oxidation stability, and shorter cooking time. A total of 49 volatile flavor compounds were identified in chicken oil samples extracted using different extraction methods. Among them, 39, 41, and 44 volatile flavor compounds were extracted from chicken oil using dry, wet, and microwave methods, respectively, with a total of 30 volatile flavor compounds. By combining ROAV and PCA, (E,E)-2,4-heptadienal, 1-octen-3-ol, hexanal, (E)-2-deceenal, 1-pentanol, octanal, (E,E)-2,4-decadienal, and 3-methylbutanal were identified as the main characteristic flavor compounds of chicken oil. The characteristic flavor substances extracted from chicken oil by microwave method had a high content and a variety of types. This study indicated that microwave technology had the advantages of relatively short time consumption, high yield, good oxidation stability, and high content and variety of characteristic flavor substances in chicken oil, making it a worthwhile approach for further research and exploration of chicken oil extraction.