gas chromatography combustion isotope ratio mass spectrometry gc c irms

Báo cáo khoa học: Natural-abundance isotope ratio mass spectrometry as a means of evaluating carbon redistribution during glucose–citrate cofermentation by Lactococcus lactis potx

Ngày tải lên : 30/03/2014, 15:20

... 13 d Ccalc pyr ¼ 2:molglc þ molcit molcit Á d13 Ccit Á d13 Cglc þ 2:molglc þ molcit where pyr ¼ pyruvate, glc ¼ glucose, cit ¼ citrate and calc ¼ calculated The resulting predicted d13Cpyruvate ... directly from citrate: molac À molcit d13 Ccalc ¼ acetate molac molcit Á d13 Ccitrate Á d13 Ccalc þ pyruvate molac lactate production, simply follows the input to the pyruvate pool As acetoin ... Petit, C. , Vilchez, F & Marczak, R (1989) Inﬂuence of citrate on diacetyl and acetoin production by fully grown cells of Streptococcus lactis subsp diaceylactis Curr Microbiol 19, 319–323 ` Cachon,...

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báo cáo hóa học: " Method optimization and validation for the simultaneous determination of arachidonic acid metabolites in exhaled breath condensate by liquid chromatography-electrospray ionization tandem mass spectrometry" doc

Ngày tải lên : 20/06/2014, 00:20

... of the concentrations used These calibration curves were used to ascertain the spiked analytes in the EBC samples Optimization of online clean-up and enrichment step A LC-LC column switching method ... of eicosanoids in EBC was commercially available enzyme linked immunoassays, which is very sensitive, but lack in specificity and detection related to structural information such as mass spectrometry ... Marko-Varga G, Edholm LE: Liquid chromatography- mass spectrometry with on-line solidphase extraction by a restricted-access C1 8 precolumn for direct plasma and urine injection J Chrom A 1997, 762:193-200...

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Determination of EDTA in Water Samples by SPE-Gas Chromatography/Mass Spectrometry

Ngày tải lên : 05/09/2013, 10:15

... Technology, Vol 8, No.4, 2010 chromatography (Nowack et al., 1996; Kemmei et al., 2009), ion chromatography/ mass spectrometry (Bauer et al., 1999; Knepper et al., 2005), gas chromatography/ mass ... ramped at 15 C/ min to 300 C then held at 300 C for The carrier gas (helium) flow rate was set at 1.2 mL/min Mass spectrometry was carried out using a 5973 Mass Selective Detector (Hewlett Packard, ... purchased from Wako Pure Chemical Industries, Ltd (Osaka, Japan) All chemicals and solutions were of analytical grade Milli-Q water was used in all experiments Gas chromatography/ mass spectrometry...

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DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY pdf

Ngày tải lên : 22/03/2014, 14:20

... Analyze each replicate according to the procedures described in Section 11.0 525.2-15 9.3.2 Calculate the measured concentration of each analyte in each replicate, the mean concentration of each analyte ... resolution fused silica capillary column of a gas chromatography/ mass spectrometry (GC/ MS) system Compounds eluting from the GC column are identified by comparing their measured mass spectra and retention ... as dictated by results of continuing calibration checks After initial calibration is successful, a continuing calibration check is required each day or at the beginning of each period in which...

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gas chromatography and mass spectrometry - a practical guide - f. kitson, et al., (ap, 1996) ww

Ngày tải lên : 04/06/2014, 15:22

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Gas Chromatography Mass Spectrometry doc

Ngày tải lên : 10/08/2014, 17:22

... Pha tĩnh c ch chuẩn bị c t s c kí Yêu c u kĩ thuật chuẩn bị mẫu s c kí, đưa mẫu lên c t C ch th c lựa chọn dung môi thay đổi dung môi trình s c ký Phương pháp phát thu nhận kết s c kí C c ví dụ ... 95%) D c t thường nhỏ giống ống mao dẫn Thông thường c t sử dụng semivolatile, hợp chất hữu không phân c c PAHs C c chất hỗn hợp phân tích c ch chạy d c theo c t     Một chất chia tách, rửa ... tiêm: µl C u Tạo C a Hệ Thống GC/ MS Thiết bị GC/ MS c u tạo thành phần: Phần s c ký khí: dùng để phân tích hỗn hợp chất tìm chất c n phân tích Phần khối phổ mô tả hợp phần riêng lẻ c ch mô tả...

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Determination of endocrine disrupting compounds in environmental samples using microextraction combined with gas chromatography mass spectrometry

Ngày tải lên : 16/09/2015, 17:12

... Capillary electrophoresis DI-SPME Direct immersion-SPME d wt Dry weight ECD Electron capture detector EDCs Endocrine disrupting compounds GC Gas chromatography GC/ MS Gas chromatography mass spectrometry ... Introduction to Endocrine Disrupting Chemicals 1.2 Microextraction Techniques PART II Chapter 2: Analysis of Aqueous Samples using Microextraction Combined with GC/ MS 2.1 Headspace Solid-Phase Microextraction ... microextraction combined with gas chromatography mass spectrometry, J CHROMATOGR A (2003), 1016 (1): 11-20 [3] C Basheer, H K Lee, J P Obbard Application of liquid-phase microextraction and gas...

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gas chromatography and mass spectrometry 978 0124833852

Ngày tải lên : 06/10/2016, 09:25

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current practice of gas chromatography mass spectrometry

Ngày tải lên : 06/10/2016, 09:28

... Phenylhydrazone EOSi(CH ) EOSi(CH ) C( CH ) EOC(CO)CH EOCH EOSi(CH ) ENRC(CO)CH ENRSi(CH ) ENRC(CO)CF3 ECCNEOCH ECCNEOSi(CH ) ECCHENHEC H 72 114 42 14 72 42 72 96 29 87 102 Principles and Instrumentation ... ideal mass analyzer The choice depends on the application A practical comparison of mass analyzers is provided in Table PRACTICAL ASPECTS OF GAS CHROMATOGRAPHY MASS SPECTROMETRY 4.1 Gas Chromatography Mass ... Applications of Gas Chromatography Mass Spectrometry in Clinical and Forensic Toxicology and Doping Control Hans H Maurer 355 15 Detection of Drugs of Abuse by Gas Chromatography Mass Spectrometry...

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liquid chromatography - mass spectrometry an introduction

Ngày tải lên : 11/04/2014, 06:58

... Liquid Chromatography Mass Spectrometry gas chromatography – in combination with mass spectrometry N -acetylglucosamine glutamine glutamic acid glycine hexose (a monosaccharide with six carbon ... science, the life sciences, clinical analysis, food science, forensic analysis, pharmaceutical science, conservation and archaeology, polymer science and general solid-state materials science ... -acetylgalactosamine gas chromatography xvi GC MS GlcNAc Gln Glu Gly Hex HexNAc His HIV HPLC i.d Ile IS IUPAC kV LC LC–FTIR LC–MS LC–MS–MS LC–ToF-MS Leu LOD LOQ Lys (M − H)− (M + H)+ MAGIC MALDI...

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niessen - liquid chromatography - mass spectrometry 3e [lcms] (crc, 2006)

Ngày tải lên : 04/06/2014, 15:33

... photocopy or use material electronically from this work, please access www.copyright.com (http://www.copyright.com/) or contact the Copyright Clearance Center, Inc (CCC) 222 Rosewood Drive, Danvers, ... ions by electron capture can occur by two mechanisms: C Associative electron capture, where an intact molecular anion M C is generated C Dissociative electron capture, where the molecular anion ... exchange heptafluorobutyric acid hydrophilic interaction chromatography high-performance anion-exchange chromatography immunoaffinity chromatography isotope- coded affinity tag inductively coupled...

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Analysis of keto enol tautomers of curcumin by liquid chromatography mass spectrometry

Ngày tải lên : 01/07/2014, 13:22

... Hatcher, R Planalp, J Cho, F.M Torti, S.V Torti, Curcumin: from ancient medicine to current clinical trials, Cell Mol Life Sci 65 (2008) 1631–1652 [6] R.F Tayyem, D.D Heath, W.K Al-Delaimy, C. L ... Al-Delaimy, C. L Rock, Curcumin content of turmeric and curry powders, Nutr Cancer 55 (2006) 126–131 [7] W Wichitnithad, N Jongaroonngamsang, S Pummangura, P Rojsitthisak, A simple isocratic HPLC method ... I Santos, Liquid chromatography mass spectrometry using the hydrogen/deuterium exchange reaction as a tool for impurity identiﬁcation in pharmaceutical process development, J Chromatogr B 825...

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Giới thiệu Gas Chromatography Mass Spectometry pdf

Ngày tải lên : 02/07/2014, 09:20

... nhỏ hình trụ c chiều dài 30 mét với mặt tráng loại polymer đ c biệt C c chất hỗn hợp phân tách c ch chạy d c theo c t Khối phổ (MS): Khối phổ dùng để x c định chất hóa h c dựa c u tr c Hãy tưởng ... chất c tính bay thấp Định lượng: GC- MS định lượng chất c ch so sánh với mẫu chuẩn, chất biết trư c định lượng chuẩn GC- MS Nhận dạng: Nếu mẫu c chất lạ xuất hiện, khối phổ nhận dạng c u tr c hóa ... nhiên, c nhiều chất gây ô nhiễm tồn không khí nồng độ thấp picogram / mét khối Vì vậy, nhu c u phương pháp c ngưỡng phát picogram c p bách GC- MS làm gì? Phân tách: GC- MS phân tách hỗn hợp hóa chất...

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Báo cáo sinh học: "High-resolution quantitative imaging of mammalian and bacterial cells using stable isotope mass spectrometry" docx

Ngày tải lên : 06/08/2014, 18:21

... DC2 DC1 OP OP 10 µm BM TBC 1 2C1 4N− (d) 1 2C1 5N− 1 2C1 5N−/1 2C1 4N− (e) (f) 1 2C (g) 1 3C 1 3C /1 2C (h) (i) Sb1 CP 0.5 µm 1 2C1 4N− 1 2C1 5N− 1 2C1 5N−/1 2C1 4N− (k) (j) 1 3C δ HSI γ 1 3C /1 2C 1 2C/ 15N− 1 2C/ 14N− ... Volume 5, Article 20 Lechene et al http://jbiol.com/content/5/6/20 IHC (a) OHC HS TM (d) PC IC TC 80 µm (b) ISS (c) 1 2C1 4N− TM 1 2C1 4N− St BM IHC IHC Cy BM N ISC (f) 1 2C1 4N− (e) S PN BS CP (g) µm ... Article 20 (a) Lechene et al http://jbiol.com/content/5/6/20 (b) (a) Ncl (b) Ncl Ncl Ncl NM 1 2C1 4N− 1 2C1 5N− (c) 81Br− (c) 1 2C1 5N− (d) (e) (d) 1 2C (f) R: 1 2C1 4N− G: 1 2C1 5N− Figure Qualitative co-localization...

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Báo cáo khoa học: "Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry" pps

Ngày tải lên : 07/08/2014, 15:20

... in mass spectra of erythromycin and roxithromycin were corresponding with Simultaneous Determination of Various Macrolides by Liquid Chromatography/ Mass Spectrometry 105 F i g T ot a l ion ch ... procedure Our method has solved previous problems by application of liquid chromatorygraphy /mass spectrometry (LC/MS) LC/MS minimizes chromatographic separation and method development time in confirming ... ic d it ion b eca u se t h e d et er m in a t ion m e t h od s b y ele ct r ochemical detection are very sensitive to environmental condition The determination method by gas chromatography- mass...

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Báo cáo khoa học: "Determination of Roxithromycin by Liquid Chromatography/ Mass Spectrometry after Multiple-Dose Oral Administration in Broilers" pdf

Ngày tải lên : 07/08/2014, 17:22

... Daisci, R., P alleschi, L., Ferretti, E., Achene, L and Cecilia, A Confirmatory method for macrolide residues in bovine tissues by micro-liquid chromatography- tandem mass spectrometry J Chromatogr ... detected or under LOQ difficult to set up analytic condition because the determination methods by electrochemical detection are very sensitive to environmental condition In conclusion, LC/MS ... specificity, limit of detection, accuracy, etc Determination of roxithromycin by HPLC with UV detector has been developed [2, 11, 14], but these methods are difficult to detect roxithormycin...

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Báo cáo y học: "Quasi-MSn identification of flavanone 7-glycoside isomers in Da Chengqi Tang by high performance liquid chromatography-tandem mass spectrometry." ppsx

Ngày tải lên : 13/08/2014, 15:21

... Tang; EIC: extracted ions chromatogram; ESI-MS: electrospray mass spectrometry; LC-ESI/MS: liquid chromatography- electrospray mass spectrometry; HPLC-DAD: highperformance liquid chromatography- diode ... 579, source CID = 70 v, CID = v) and quasi-MS/MS/MS (from quasi-second order precursor ion m/z 271, source CID = 70 v, CID = 30 v) and then impacted in CID with collision gas (argon; source CID = ... antibiotics in biological samples by short-column liquid chromatography couple with electrospray ionization tandem mass spectrometry Anal Chem 1997, 69:4143-4155 Joly N, El Aneed A, Martin P, Cecchelli...

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Báo cáo y học: "Quality evaluation of mycelial Antrodia camphorata using high-performance liquid chromatography (HPLC) coupled with diode array detector and mass spectrometry (DAD-MS)" pps

Ngày tải lên : 13/08/2014, 15:21

... cytotoxic effects on LLC tumor cell line J Nat Prod 2004, 67(1):46-48 Chen CC, Liu YW, Ker YB, Wu YY, Lai EY, Chyau CC, Hseu TH, Peng RY: Chemical characterization and anti-inflammatory effect ... chromatographic fingerprint of methanol extract of mycelial AC Preliminary application of mycelial AC chromatographic fingerprint Two over-the-counter products that claimed consisted of mycelial AC were ... Leung Chinese Medicine 2010, 5:4 http://www.cmjournal.org/content/5/1/4 bioactive chemicals include amino acids [14,15]; lipopolysaccharides [16]; nucleosides and nucleobases such as adenosine, cordycepin,...

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Báo cáo y học: "Comparison of raw and processed Radix Polygoni Multiflori (Heshouwu) by high performance liquid chromatography and mass spectrometry" pptx

Ngày tải lên : 13/08/2014, 15:21

... acetic acid)/water (containing 0.5% acetic acid) at a flow rate of mL/min by a discontinuous gradient in which acetonitrile was adjusted Chemicals and reagents HPLC-grade acetonitrile (Labscan, ... furfural; P-RPM contains less amino acids and monosaccharides and has a lower pH value than R-RPM [31] In recent years, high performance liquid chromatography (HPLC) and gas chromatography (GC) have ... multiflori by capillary gas Liang et al Chinese Medicine 2010, 5:29 http://www.cmjournal.org/content/5/1/29 Page of chromatography coupled with flame ionization and mass spectrometric detection J Chromatogr...

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