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Ô­ÎÄÏ×£ºRaw GC¨CMS data were converted into CDF format (NetCDF) files by Xcalibur (Thermo Fisher Scientific Inc.,Waltham, MA,USA). Automatic peak detection and peak alignment were performed by the XCMS software (version 1.6.1) based on Rprogramversion2.6.1 (R-Foundation for statistical computing,www.Rproject.org). The parameters of XCMS were used for the following: xcmsSet (fwhm= 7.5, max =300, snthresh= 2), group (bw= 10, max= 300). The resulting three-dimensional data table, consisted of arbitrary peak index (RT-m/z pair), sample names (observations), and peak area (variables) was listed into a .txt file, and then normalization was carried out in Microsoft Excel prior to multivariate analyses.

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