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 8

Effects of extraction time on volatile compounds of pepper chicken soup. English letters “a”, “b”, “c” indicate Duncan’s multiple range test among peak areas of the five extraction times. Greek letters “α”, “β”, “γ”, “δ” indicate Duncan’s multiple range test among peak numbers of the five extraction times. 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).