Study of Four Coating Materials of SPME Fiber on Extraction of Aroma Compounds in Strawberry

【Objective】 In this paper the extraction of strawberry aroma compounds with four coating materials of solid-phase micro-extraction (SPME) fiber and the automatic identification method for gas chromatography/mass spectrometry (GC/MS) data were researched. The aim of this experiment was to summarize a simple, accurate method for quality breeding and processing of strawberry. 【Method】 The aroma compounds in strawberry were detected by SPME-GC/MS- the automatic mass spectral deconvolution and identification system (AMDIS). 【Result】 A total of 97 compounds were identified from the sample extracts. The major constituents were esters, alcohols, ketones and terpenes, with the proportions of 42.3%, 13.4%, 10.3% and 6.2%, respectively. There are at least eight kinds of characteristic aroma components in strawberry. The most important aroma compounds were ethyl butanoate, ethyl hexanoate, linalool, furaneol, methyl butanoate, methyl hexanoate, 2-heptanone and nerolidol according to their aroma values. The 50/30 μm DVB/CAR/ PDMS fiber showed high sensitivity and selectivity for the determination of aroma compounds. The rest sequence was 100 μm PDMS,85 μm PA and 7 μm PDMS fibers in turn. Four SPME fibers had the similar extraction effect to ester. 50/30 μm DVB/CAR/PDMS fiber had significantly higher extraction effect than other fibers to ketones, terpenes, alcohols and aldehydes. 【Conclusion】 50/30 μm DVB /CAR /PDMS fiber is suitable for the extraction of aroma compounds of strawberry. The AMDIS is sensitive, accurate and rapid. It is worth to be popularized and applied.