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Featured researches published by Yaoming Hu.


Journal of Chromatography A | 2002

Rapid determination of volatile constituents of Michelia alba flowers by gas chromatography-mass spectrometry with solid-phase microextraction

Chunqing Shang; Yaoming Hu; Chunhui Deng; Keji Hu

The volatile constituents of Michelia alba flowers, including fresh flowers, frozen flowers and withered flowers, were investigated by GC-MS. The volatiles in a simulated natural environment were sampled by solid-phase microextraction (SPME), with a 100 microm polydimethylsiloxane fiber at 25+/-5 degrees C for 4 h. The fibers were desorbed in a GC injection liner at 250 degrees C for 3 min. With headspace SPME-GC-MS analysis, 61 peaks were separated. The main compounds in headspace of fresh Michelia alba flowers included alpha-myrcene, (S)-limonene, (R)-fenchone, linalool, camphor, caryophyllene, germacrene D, etc., a greater number of compounds than for frozen flowers and withered flowers. At the same time, the biomarkers of fresh flowers were compared with the frozen flowers and withered flowers. In this study, headspace SPME-GC-MS afforded a simple and more sensitive sampling method for fresh Michelia alba flowers and other fresh flowers.


Journal of Chromatography B | 2002

Rapid diagnosis of phenylketonuria and other aminoacidemias by quantitative analysis of amino acids in neonatal blood spots by gas chromatography–mass spectrometry

Chunhui Deng; Chunqing Shang; Yaoming Hu; Xiangmin Zhang

A new method for quantifying specific amino acids in small volumes of plasma and whole blood has been developed. Volatile derivatives of amino acids are analyzed by gas chromatography-mass spectrometry. The method only takes a few minutes to perform and requires minimal sample preparation. The accurate assay of phenylalanine, tyrosine and other amino acids in dried blood spots could be used for neonatal screening for phenylketonuria and other aminoacidemias. Because of the low cost, this neonatal screening method is suited to application in developing countries such as China.


Chromatographia | 2003

Determination of the volatile constituents of ChineseCoriandrum sativum L. by gas chromatography—Mass spectrometry with solid-phase microextraction

Chunhui Deng; Guoxin Song; Yaoming Hu; Xiangmin Zhang

SummaryFifteen main volatile compounds in ChineseCoriandrum sativum L. were separated and identified by gas chromatography—mass spectrometry (GC-MS) combined with solid-phase microextraction (SPME). Fresh ChineseCoriandrum sativum L. was ground and its volatile compounds were extracted by SPME with a 100 μm polydimethylsiloxane fiber. The fibers were desorbed in a GC injection liner at 250°C for 3 min. More than 15 peaks were separated by headspace SPME-GC-MS analysis. The main compounds in headspace ofCoriandrum sativum L. identified by mass spectrometry included decanal, 2-decenal, 1-decanol,trans-2-decen-1-ol,trans-2-decen-1-al,trans-2-tridecenal etc, which were verified by reference compounds. Their relative contents were calculated on basis of peak areas. SPME extraction conditions and capillary chromatography column used to separate the volatile compounds were investigated.


Journal of Analytical Chemistry | 2007

Use of solid-phase microextraction as a sampling technique for the characterization of volatile compounds emitted from Chinese daffodil flowers

Guoxin Song; Jinfen Xiao; Chunhui Deng; X. Zhang; Yaoming Hu

Headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS) has been applied to the determination of volatile compounds emitted from living daffodil flowers. The SPME conditions were optimized and applied to headspace extraction of the volatile compounds. The volatile compounds adsorbed on the fiber were desorbed and analyzed by GC-MS. We identified 27 compounds in the flower emission, which mainly included acetic acid phenethyl ester (31.68%), E-ocimene (17.15%), acetic acid benzyl ester (11.53%), neo-allo-ocimene (6.94%), allo-ocimene(5.34%), α-linalool (5.26%), 1,8-cineole(3.70%), benzenepropyl acetate (1.98%), and 3-methyl-2-buten-1-ol acetate(1.88%). The volatile compounds emitted by the flower excised from the daffodil were also analyzed by the present method, and the results showed that n-pentadecane, n-hexadecane, n-octadecane, and acetic acid phenethyl ester might be biomarker compounds of living daffodil flowers. To our knowledge, this is the first report on the volatile compounds emitted from Chinese daffodil flowers.


Chromatographia | 2002

Headspace solid-phase microextraction and gas chromatography-mass spectrometry analysis of free volatile compounds inMango

Chunqing Shang; Chunhui Deng; Xiaoyue Zhang; Zhengfu Chen; Yaoming Hu

SummaryManual headspace—solid-phase microextraction (HS-SPME) gas chromatography-mass spectrometry (GC-MS), a simple, rapid and sensitive method, was employed for the identification and quantitative analysis of the main volatile constituents inMango juice. Nineteen compounds were quantified though standard addition. The main volatile compounds ofMango juice were terpenes, including mono-or sesquiterpene hydrocarbons, such as 1R-α-pinene, 3-carene, α-terpinene, limonene, E-α-ocimene, terpinolene, eremophiladiene, α-caryophyllene, and guaiadiene with concentrations varying from 4 to 8000 μg L−1. The factors affecting quantitative results, including absorption time, speed of stirring and ionic strength are discussed.


Journal of Chromatography A | 2018

The synthesis of Zr-metal-organic framework functionalized magnetic graphene nanocomposites as an adsorbent for fast determination of multi-pesticide residues in tobacco samples

Rongrong Jin; Fenqi Ji; Huaqing Lin; Chen Luo; Yaoming Hu; Chunhui Deng; Xiujun Cao; Chunfu Tong; Guoxin Song

In this paper, a simple and reliable method has been established to determine the residues of nine pesticides in tobacco by using GC-MS coupled with magnetic solid phase extraction. A novel magnetic Zr-MOF nanocomposite based on graphene was synthesized, and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), Raman spectroscopy and N2 adsorption-desorption measurements. The prepared material has the advantage of large surface area (178 m2/g), good magnetic response and high thermal stability, which is shown to be suited for the fast enrichment of multi-pesticides in tobacco matrix. The extraction conditions including amount of adsorbent, adsorption time, eluting solvent as well as desorption time were investigated. The whole process of pretreatment is accomplished within 10 min. This method shows low limit of detection, wide linear range and good reproducibility (relative standard deviations <12.7%), satisfactory recoveries were obtained, ranging from 57.9% to 126.3% for tobacco samples.


Annali Di Chimica | 2004

Application of HS‐SPME and GC‐MS to Characterization of Volatile Compounds Emitted from Osmanthus Flowers

Chunhui Deng; Guoxin Song; Yaoming Hu


Chromatographia | 2007

GC–MS Analysis of the Essential Oils of Piper nigrum L. and Piper longum L.

Ling Liu; Guoxin Song; Yaoming Hu


Chromatographia | 2003

Analysis of the Volatile Constituents of Schisandra chinesis (Turz.) Bail by Gas Chromatography-Mass Spectrometry, Using Headspace Solid-Phase Microextraction

Chunhui Deng; Guoxin Song; Yaoming Hu; Xiangmin Zhang


Chromatographia | 2004

Comparison of Essential Oil Composition of Artemisia argyi Leaves at Different Collection Times by Headspace Solid-Phase Microextraction and Gas Chromatography-Mass Spectrometry

Xiaohua Zheng; Chunhui Deng; Guoxin Song; Yaoming Hu

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