Abstract: Objective: To explore the relationship between the volatile components of different potato varieties and processing temperature and to analyze the differences among different geographical environments. Methods: The volatiles of potato processed at room temperature, 100 and 150 ℃ were detected by electronic nose and the obtained data were analyzed by linear discriminant analysis (LDA). Then headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) was used to detect and qualitatively and quantitatively analyze the volatile compounds of potato. Results: The electronic nose could sensitively detect the significant difference in volatile composition among two potato growing regions. A total of 54, 62, 75, 71 and 46 volatile compounds were detected in potato samples 1, 2, 3, 4 and 5 by gas chromatorgraphy-mass spectrometry (GC-MS), respectively, mainly including alcohols, hydrocarbons, aldehydes, ketones, esters, furans and other compounds. 2-Pentyl-furan, long-chain alkanes and benzeneacetaldehyde were the characteristic volatile components of potato sample 1,2-pentyl-furan, 2,2,3,3-tetramethyl-butane, 2-octena, benzeneacetal dehyde and oleic acid-3-(octadecyloxy)-propyl ester were the characteristic volatile components of potato sample 2,1-octen-3-ol, 1-butanol- 3-methyl-acetate, toluene, 2-methyl-butanal, benzeneacetaldehyde, formic acid-2-ethylhexyl ester, carbonic acid-isobutyl 2-ethylhexyl ester and 2-pentyl-furan were the characteristic volatile components of potato sample 3,1-octen-3-ol, 3-methylacetate- 1-butanol, carbonic acid-isobutyl 2-ethylhexyl ester, methyl salicylate and 2-pentyl-furan were the characteristic volatile components of potato 4, and 1-octen-3-ol, methyl salicylate, 2-pentyl-furan and 3-methyl-acetate-1-butanol were the characteristic volatile components of potato sample 5. Conclusions: Different potato varieties and different growing regions are different in the main types of volatile components and their relative contents.

Key words: potato, electronic nose, headspace solid phasemicro-extraction (HS-SPME), gas chromatography-mass spectrometry (GC-MS), volatile components