采用超高效液相色谱-电喷雾串联质谱法(UPLC-ESI MS/MS)并结合气相色谱-质谱法分离鉴定了烟草中5种主要的糖苷类香味前体物质.烟样经甲醇提取、XAD-2柱净化,得到初步纯化的糖苷,在pH 5条件下将其酶解,释放出糖苷配基.采用气相色谱-质谱分析并通过标准谱库检索确定了5种挥发性苷元;然后通过电喷雾质谱(负离子模式)确定糖苷母离子并作碎片离子扫描(MS~2),确定了5种糖苷类香味前体物质的存在形式;最后采用UPLC-ESI MS/MS,以甲醇和乙酸-乙酸铵水溶液为流动相,通过RP-C_(18)柱分离,在多反应监测(MRM)模式下,鉴定了烟草中5种主要的糖苷类香味前体物质,为应用液相色谱-质谱分析缺乏标准样品的糖苷类香味前体物质奠定了基础.
A qualitative method for the identification of 5 main glycosidic flavor precursors in tobacco was developed by using ultra performance liquid chromatography-electrospray ioniza-tion tandem mass spectrometry (UPLC-ESI MS/MS) and gas chromatography-mass spectrome-try (GC-MS). The glycosidic flavor precursors in tobacco were extracted with methanol, cleaned up with an XAD-2 column. The aglycones were later released by enzyme-mediated hydrolysis under the condition of pH 5. The 5 volatile aglycone moieties were identified by GC-MS standard spectra library. The precursor ions of glycosides were determined by using electro-spray ionization mass spectrometry in negative ion mode, then the 5 glycosidic flavor precur-sors were identified by using product ion scan (MS~2) finally, using UPLC-ESI MS/MS, separa-tion and identification of 5 glycosidic flavor precursors were accomplished on an RP-C_(18) column in the multiple reaction monitoring (MRM) mode by using methanol and acetic acid-ammonium acetate aqueous solution as eluent. This work lays a foundation for the analysis of glycosidic flavor precursors without the standards by using liquid chromatography-mass spectrometry.
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