Yaoming Hu
Fudan University
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Publication
Featured researches published by Yaoming Hu.
Journal of Chromatography A | 2002
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
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
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
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
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
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
Chunhui Deng; Guoxin Song; Yaoming Hu
Chromatographia | 2007
Ling Liu; Guoxin Song; Yaoming Hu
Chromatographia | 2003
Chunhui Deng; Guoxin Song; Yaoming Hu; Xiangmin Zhang
Chromatographia | 2004
Xiaohua Zheng; Chunhui Deng; Guoxin Song; Yaoming Hu