Discrimination and Characterization of the Volatile Organic Compounds in Schizonepetae Spica from Six Regions of China Using HS-GC-IMS and HS-SPME-GC-MS
Chao LiHuiying WanXinlong WuJiaxin YinLimin ZhuHanjiang ChenXinbo SongLifeng HanWenzhi YangHeshui YuZheng Li
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Abstract:
Volatile organic compounds (VOCs) are the main chemical components of Schizonepetae Spica (SS), which have positive effects on the quality evaluation of SS. In this study, HS-SPME-GC-MS (headspace solid-phase microextraction-gas chromatography-mass spectrometry) and HS-GC-IMS (headspace-gas chromatography-ion mobility spectrometry) were performed to characterize the VOCs of SS from six different regions. A total of 82 VOCs were identified. In addition, this work compared the suitability of two instruments to distinguish SS from different habitats. The regional classification using orthogonal partial least squares discriminant analysis (OPLS-DA) shows that the HS-GC-IMS method can classify samples better than the HS-SPME-GC-MS. This study provided a reference method for identification of the SS from different origins.Keywords:
Solid-Phase Microextraction
Two-dimensional gas
Solid-Phase Microextraction
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固相マイクロ抽出/GC/MSを用いて環境水及び工場排水中の水溶性化学物質26種 (アルコール類, アクリル酸エステル類, エーテル類, ピリジン類等) の一斉分析法を開発した. 最初にGC条件の検討を行い, 続いてSPMEファイバーの抽出率を向上するためのファイバーの種類, 塩の種類, 抽出時間及び試料容量の検討を行った. 完成した方法は, 試料水に塩析剤として塩化ナトリウムを加え, 直接浸漬法で1時間抽出した後, GC/MS-SIMで測定するものである. 精製水における0.01～5μg/lでの添加回収試験結果は, 回収率の平均が99.9%, 相対標準偏差の平均が11.7%であった. また, 検出限界は0.005～3.9μg/lであった. 本法を実際の環境試料 (河川水, 海水) や工場排水の分析に用いた. その結果, 環境試料から1-プロパノール, ピリジン, 2-ブトキシエタノール, ジメチルスルホキシド等が, 工場排水から2-プロパノール, アセトニトリル, ピリジン, ジメチルスルホキシド等が, 数十ng/l～数十μg/lのレベルで検出され, 本法は清澄な試料だけでなく, マトリックスの多い試料水にも十分適用できることが確認された.
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The volatile components of Chinese eaglewood wood are extracted by solid phase microextraction,40 components are identified by GC / MS method.The identified compounds make up 77.70 % of the total volatile substances,the main constituents are:1H-3a,7-Methanoazulene,2,3,4,7,8,8a-hexahydro-3,6,8,8-tetramethyl-(26.45%),2-Naphthalenemethanol,1,2,3,4,4a,5,6,8a-octahydro-alpha,alpha,4a,8-tetramethyl-(5.51%)and2-Naphthalenemethanol,1,2,3,4,4a,8a-hexahydro-alpha.,alpha.,4a,8-tetramethyl-(6.27%).
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Abstract This study was carried out to determine the volatile compounds from four samples of fresh wet noodles and the changes in the volatile compound composition during the storage process. The volatile compounds from four samples of fresh wet noodles were characterized by headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME/GC-MS). The compositions of the volatile compounds varied among fresh and cooked wet noodles made from the raw potato/wheat flour or wheat flour. A total of 194 volatile compounds were detected in the raw potato noodles, main volatiles including aldehydes, alcohols, ketones, esters and organic acids. The total volatile compounds in the potato/wheat flour noodle samples contained mainly aldehyde compounds and were greater than those in the wheat noodles. The total volatile compounds in the cooked noodle samples were greater than those in raw noodle samples. Alcohols and ketones were the least common types of volatile substances in the samples at 0 h. During storage time, alcohols and ketones were increased in volatile substances, and the amount of acids increased dramatically. The results indicated that the aroma of fresh wet noodles was affected by the storage process.
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Solid-Phase Microextraction
Volatile organic compound
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Solid-Phase Microextraction
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Gas Chromatography separates components in time. Mass spectroscopy provides information that aids in the identification and structural elucidation of each component. Comprehensive 2-Dimensional gas chromatography (GC×GC) is a novel technique. The revolutionary aspect of GC x GC, with respect to classical multidimensional chromatography, is that the entire sample is subjected to two distinct analytical separations. The resulting enhanced separating capacity makes this approach a prime choice when GC analysts are challenged with highly complex mixtures. The combination of a third mass spectrometric dimension to a GC x GC system generates the most powerful analytical tool today for volatile and semi-volatile analytes. The present review is focused on the instrumentation of 2D GC-MS, the difference between GC and 2d GC, application of 2d GC-MS have been discussed.
Two-dimensional gas
Two-Dimensional Chromatography
Instrumentation
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The volatile compounds from the black poplar leaves were efficiently extracted with solid-phase microextraction(SPME) at 45 ℃ to perform gas chromatography/mass spectrometry(GC/MS) analysis.The GC/MS analysis indicated that the volatile compounds from the black poplar leaves were 2-hydroxy-benzaldehyde,(Z)-3-hexen-1-ol,acetate,(Z)-3-hexen-1-ol,2-ethylhexyl salicylate and so on.
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