Gradual Optimization of Headspace Solid-Phase Microextraction Conditions of Volatiles in Pepper Chicken Soup Combined with Gas Chromatography-Mass Spectrometry and Principal Component Analysis

Figure 4

Effects of different sample volumes on extracting volatiles of pepper chicken soup. English letters “a”, “b”, “c”, “d”, “e” indicate Duncan’s multiple range test among peak areas of the five sample volumes. Greek letters “α” and “β” indicate Duncan’s multiple range test among peak numbers of the five sample volumes. Data in the same group marked with different letters mean significant difference (p<0.05) and the same letters denote not significant difference (p<0.05).