Better together – Relative retention time plus spectral matching improves automated glycan characterization using PGC-nLC-IT-ESI-MS/MS

Porous Graphitized Carbon nano-liquid chromatography tandem mass spectrometry (PGC-nLC-MS/MS) is a glycomics technique with the unique capacity to differentiate isobaric glycans. The lack of suitable software tools integrating chromatography and MS-information delivered by PGC-nLC-MS/MS has been limiting fast and robust glycan identification and quantitation. We report a LC-system-independent strategy called GlycoRRT that combines relative retention time (RRT) and negative ion fragment spectra analyses for isobaric structure-specific glycomics of PGC-nLC-MS/MS data. The GlycoRRT toolset is fully customizable and easily adaptable enabling semi-automated high-throughput structural assignments. The current library contains over 200 entries and their individual meta-data (MS instrumentation, experimental conditions, retention times, fragmentation profiles and glycan structural diagnostic ion features) relevant for reliable data analyses. The GlycoRRT workflow was employed to map the N- and O-glycome in blood group matched human plasma and urine as well as decipher Immunoglobulin (IgG) glycosylation features from 13 different animal species. We have also developed visualization tools to enable a consistent, reliable and reproducible analysis of large sets of multidimensional PGC-nLC-MS/MS glycomics data. This comprehensive glycan resource provides the glycan map of human and animal species, will serve as a reference in dissecting the role of glycans in host pathogen interaction and zoonotic disease transmission.

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2,2-Dialkylacetic Acids -A New Class of Naturally Occurring Lipid Constituents

Zeitschrift für Naturforschung C ◽

10.1515/znc-1995-1-218 ◽

1995 ◽

Vol 50 (1-2) ◽

pp. 123-126 ◽

Cited By ~ 2

Author(s):

Gottfried Raab ◽

Jürgen Jacob

Keyword(s):

Retention Time ◽

Relative Retention Time ◽

Methyl Esters ◽

South American ◽

Time Data ◽

New Class ◽

The Past ◽

Relative Retention ◽

Naturally Occurring ◽

Acetic Acids

Abstract The uropygial gland waxes of the South American red-legged Seriema (Cariama cristata (L., 1766)) were found to be composed of unbranched alcohols and 2,2′-dialkyl-substituted acetic acids which so far have not been found in skin lipids. When used as a chemosystematic character, the occurrence of this lipid class separates the order Cariamiformes (Seriemas) from all other avian orders hitherto investigated, especially from the Gruiformes (cranes and rails) to which they have been tentatively attributed in the past. From the GC retention time data now available for a series of 2-alkyl-substituted fatty acid methyl esters relative retention time indices for other compounds may be predicted.

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Application of a random forests (RF) method as a new approach for variable selection and modelling in a QSRR study to predict the relative retention time of some polybrominated diphenylethers (PBDEs)

Analytical Methods ◽

10.1039/c2ay25484k ◽

2012 ◽

Vol 4 (11) ◽

pp. 3733 ◽

Cited By ~ 5

Author(s):

Nasser Goudarzi ◽

Davood Shahsavani

Keyword(s):

Variable Selection ◽

Random Forests ◽

Retention Time ◽

Relative Retention Time ◽

New Approach ◽

Relative Retention ◽

Polybrominated Diphenylethers

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Capillary Gas Chromatographic Separation of Various Stimulants

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/68.4.809 ◽

1985 ◽

Vol 68 (4) ◽

pp. 809-810

Author(s):

Devendra Trivedi

Keyword(s):

Retention Time ◽

Chromatographic Separation ◽

Relative Retention Time ◽

Reference Standard ◽

Relative Retention ◽

Gas Chromatographic Separation

Abstract A capillary gas chromatographic (GC) method was developed for the separation of various stimulants of forensic and pharmaceutical interest. The data consist of retention time, relative retention time, corrected retention time, and relative corrected retention time, calculated using ephedrine as reference standard.

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Semi-Empirical Topological Method for Prediction of the Relative Retention Time of Polychlorinated Biphenyl Congeners on 18 Different HR GC Columns

Chromatographia ◽

10.1365/s10337-010-1696-5 ◽

2010 ◽

Vol 72 (5-6) ◽

pp. 523-533 ◽

Cited By ~ 14

Author(s):

Raouf Ghavami ◽

S. Mohammad Sajadi

Keyword(s):

Retention Time ◽

Relative Retention Time ◽

Polychlorinated Biphenyl ◽

Topological Method ◽

Relative Retention ◽

Semi Empirical

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Study on the diagram of relative retention time for organophosphorus pesticides by gas chromatography.

Eisei kagaku ◽

10.1248/jhs1956.34.282 ◽

1988 ◽

Vol 34 (3) ◽

pp. 282-290 ◽

Cited By ~ 1

Author(s):

MASAMI OMURA ◽

KUMIKO HASHIMOTO ◽

KUNIO OHTA ◽

KAZUO SHINJI ◽

KEIKO ANDO ◽

...

Keyword(s):

Gas Chromatography ◽

Retention Time ◽

Relative Retention Time ◽

Organophosphorus Pesticides ◽

Relative Retention

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QSPR study on GC relative retention time of organic pesticides on different chromatographic columns

Journal of Separation Science ◽

10.1002/jssc.200800026 ◽

2008 ◽

Vol 31 (13) ◽

pp. 2434-2443 ◽

Cited By ~ 6

Author(s):

Ruzhu Hu ◽

Chunsheng Yin ◽

Yang Wang ◽

Chunhui Lu ◽

Tiefei Ge

Keyword(s):

Retention Time ◽

Relative Retention Time ◽

Relative Retention ◽

Chromatographic Columns ◽

Qspr Study ◽

Organic Pesticides

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Effective application of the relative retention time diagram for gas chromatographic analysis of pesticides

Journal of Agricultural and Food Chemistry ◽

10.1021/jf00012a020 ◽

1991 ◽

Vol 39 (12) ◽

pp. 2200-2205 ◽

Cited By ~ 2

Author(s):

Masami Omura ◽

Kumiko Hashimoto ◽

Kunio Ohta ◽

Tomoyuki Iio ◽

Shigekazu Ueda ◽

...

Keyword(s):

Retention Time ◽

Chromatographic Analysis ◽

Relative Retention Time ◽

Time Diagram ◽

Effective Application ◽

Gas Chromatographic Analysis ◽

Relative Retention

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Behavior of 78 Pesticides and Pesticide Metabolites on Four Different Ultra-Bond Gas Chromatographic Columns

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/70.6.1014 ◽

1987 ◽

Vol 70 (6) ◽

pp. 1014-1017

Author(s):

John F Suprock ◽

Howard J Vinopal

Keyword(s):

Retention Time ◽

Relative Retention Time ◽

Mixed Phase ◽

Elution Order ◽

Organophosphorus Insecticides ◽

Time Data ◽

Relative Retention ◽

Pesticide Metabolites ◽

Different Types ◽

Dual Column

Abstract The gas chromatographic (GC) elution order and relative retention time data (compared to aldrin) are presented for 78 pesticides and pesticide metabolites on 4 different types of commercially available 2 mm id ultra-Bond columns including ultra-Bond 20M (20M), Ultra-Bond 20SE (20SE), Ultra-Bond 20M coated with 1% OV-210 (OV-210), and ultra-Bond 20M coated with 0.5% OV-210 + 0.65% OV-17 (mixed phase). Relative retention time data (compared to parathion) are also represented for 19 organophosphorus insecticides on the 4 ultra-Bond columns evaluated. Corresponding 4 mm id Ultra-Bond columns were evaluated at the same time as the 2 mm id columns, and results and comparisons for these larger-diameter columns are discussed. These data indicate that, with aldrin as a reference peak, a complement of the mixed-phase column and either the 20M, the 20SE, or the OV-210 column represents a useful chromatographic tool for dual-column analysis of pesticide residues. The 2 mm id columns were more useful in chromatographing later-eluting pesticides whereas the corresponding 4 mm id columns were more useful in chromatographing earlier-eluting pesticides.

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Evidence for a Chromatographic Model of Olfaction

The Journal of General Physiology ◽

10.1085/jgp.56.1.46 ◽

1970 ◽

Vol 56 (1) ◽

pp. 46-63 ◽

Cited By ~ 106

Author(s):

Maxwell Mark Mozell

Keyword(s):

Retention Time ◽

Relative Retention Time ◽

Olfactory Nerve ◽

General Level ◽

Medial Branch ◽

Gas Chromatograph ◽

Flow Rates ◽

Relative Retention ◽

Chromatographic Process ◽

Small Change

The gradient of activity produced along the olfactory mucosa by odorant stimulation was measured by the ratio (the LB/MB ratio) of the summated neural discharges recorded from two branches of the olfactory nerve, a lateral branch (LB) supplying a mucosal region near the internal naris and a medial branch (MB) supplying a region near the external naris. Twenty-four frogs "sniffed" sixteen different odorants, each odorant at four concentrations and two flow rates. Increases in concentration and flow rate produced statistically reliable increases in the ratios; the magnitude of these increases was considerably smaller than the magnitude of the statistically significant changes that could be achieved by shifting the odorants themselves. Even the small change due to concentration depended upon the odorant presented. Thus, even at the highest physiologically possible concentrations and flow rates, the general level of the activity gradient along the mucosa appeared to be determined mainly by the particular odorant used. The relative retention time of each of these 16 different odorants was measured in a gas chromatograph fitted with a Carbowax 20M column. In general, the longer the odorant's retention time the smaller its LB/MB ratio. This suggests that the different mucosal gradients of activity are established for different odorants by a chromatographic process. The data further suggest that the mucosa behaves like a polar chromatographic column.

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