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  1. Article ; Online: Revisiting the basis of the excited states for solvated fluorinated benzenes and pentafluorophenylalanine.

    Kang, Jeonghee / Chulhai, Dhabih / Desamero, Ruel / Profit, Adam / Lee, Jong I

    Results in chemistry

    2023  Volume 5

    Abstract: Vapor-phase molecular simulation studies of aromatic compounds with five or more fluorine atoms on the ring reveal emission spectra characterized by ... ...

    Abstract Vapor-phase molecular simulation studies of aromatic compounds with five or more fluorine atoms on the ring reveal emission spectra characterized by S
    Language English
    Publishing date 2023-01-05
    Publishing country Netherlands
    Document type Journal Article
    ISSN 2211-7156
    ISSN (online) 2211-7156
    DOI 10.1016/j.rechem.2023.100770
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Quantification of desmosine and isodesmosine using MALDI-ion trap tandem mass spectrometry

    Rathod, Pratikkumar / Kaur, Manjeet / Ho, Hsin-Pin / Louis, Marissa E / Dhital, Basant / Durlik, Philip / Boutis, Gregory S / Mark, Kevin J / Lee, Jong I / Chang, Emmanuel J

    Analytical and bioanalytical chemistry. 2018 Oct., v. 410, no. 26

    2018  

    Abstract: Desmosine (Des) and isodesmosine (Isodes), cross-linking amino acids in the biomolecule elastin, may be used as biomarkers for various pathological conditions associated with elastin degradation. The current study presents a novel approach to quantify ... ...

    Abstract Desmosine (Des) and isodesmosine (Isodes), cross-linking amino acids in the biomolecule elastin, may be used as biomarkers for various pathological conditions associated with elastin degradation. The current study presents a novel approach to quantify Des and Isodes using matrix-assisted laser desorption ionization (MALDI)-tandem mass spectrometry (MS2) in a linear ion trap coupled to a vacuum MALDI source. MALDI-MS2 analyses of Des and Isodes are performed using stable-isotope-labeled desmosine d4 (labeled-Des) as an internal standard in different biological fluids, such as urine and serum. The method demonstrated linearity over two orders of magnitude with a detection limit of 0.02 ng/μL in both urine and serum without enrichment prior to mass spectrometry, and relative standard deviation of < 5%. The method is used to evaluate the time-dependent degradation of Des upon UV irradiation (254 nm) and found to be consistent with quantification by 1H NMR. This is the first characterized MALDI-MS2 method for quantification of Des and Isodes and illustrates the potential of MALDI-ion trap MS2 for effective quantification of biomolecules. The reported method represents improvement over current liquid chromatography-based methods with respect to analysis time and solvent consumption, while maintaining similar analytical characteristics. Graphical abstract ᅟ
    Keywords amino acids ; biomarkers ; blood serum ; crosslinking ; desorption ; elastin ; ionization ; liquid chromatography ; nuclear magnetic resonance spectroscopy ; solvents ; statistical analysis ; tandem mass spectrometry ; ultraviolet radiation ; urine
    Language English
    Dates of publication 2018-10
    Size p. 6881-6889.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ISSN 1618-2642
    DOI 10.1007/s00216-018-1288-z
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Determination of gas-oil miscibility conditions by interfacial tension measurements.

    Rao, Dandina N / Lee, Jong I

    Journal of colloid and interface science

    2003  Volume 262, Issue 2, Page(s) 474–482

    Abstract: Processes that inject gases such as carbon dioxide and natural gas have long been and still continue to be used for recovering crude oil from petroleum reservoirs. It is well known that the interfacial tension between the injected gas and the crude oil ... ...

    Abstract Processes that inject gases such as carbon dioxide and natural gas have long been and still continue to be used for recovering crude oil from petroleum reservoirs. It is well known that the interfacial tension between the injected gas and the crude oil has a major influence on the efficiency of displacement of oil by gas. When the injected gas becomes miscible with the crude oil, which means that there is no interface between the injected and displaced phases or the interfacial tension between them is zero, the oil is displaced with maximum efficiency, resulting in high recoveries. This paper presents experimental measurements of interfacial tension between crude oil and natural gases (using a computerized drop shape analysis technique) as a function of pressure and gas composition at the temperature of the reservoir from which the crude oil was obtained. The point of zero interfacial tension was then identified from these measurements by extrapolation of data to determine minimum miscibility pressure (MMP) and minimum miscibility composition (MMC). The gas-oil miscibility conditions thus obtained from interfacial tension measurements have been compared with the more conventional techniques using slim-tube tests and rising-bubble apparatus as well as predictive correlations and visual observations. The miscibility pressures obtained from the new VIT technique were 3-5% higher than those from visual observations and agreed well with the slim-tube results as well as with the correlations at enrichment levels greater than 30 mol% C2+ in the injected gas stream. The rising bubble apparatus yielded significantly higher MMPs. This study demonstrates that the VIT technique is rapid, reproducible, and quantitative, in addition to providing visual evidence of gas-oil miscibility.
    Language English
    Publishing date 2003-06-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/S0021-9797(03)00175-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Z 71/707: Show issues

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  4. Article ; Online: Quantification of desmosine and isodesmosine using MALDI-ion trap tandem mass spectrometry.

    Rathod, Pratikkumar / Kaur, Manjeet / Ho, Hsin-Pin / Louis, Marissa E / Dhital, Basant / Durlik, Philip / Boutis, Gregory S / Mark, Kevin J / Lee, Jong I / Chang, Emmanuel J

    Analytical and bioanalytical chemistry

    2018  Volume 410, Issue 26, Page(s) 6881–6889

    Abstract: Desmosine (Des) and isodesmosine (Isodes), cross-linking amino acids in the biomolecule elastin, may be used as biomarkers for various pathological conditions associated with elastin degradation. The current study presents a novel approach to quantify ... ...

    Abstract Desmosine (Des) and isodesmosine (Isodes), cross-linking amino acids in the biomolecule elastin, may be used as biomarkers for various pathological conditions associated with elastin degradation. The current study presents a novel approach to quantify Des and Isodes using matrix-assisted laser desorption ionization (MALDI)-tandem mass spectrometry (MS
    MeSH term(s) Desmosine/analysis ; Desmosine/blood ; Desmosine/chemistry ; Desmosine/urine ; Humans ; Limit of Detection ; Reference Standards ; Reproducibility of Results ; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization/methods ; Tandem Mass Spectrometry/methods
    Chemical Substances Desmosine (11003-57-9)
    Language English
    Publishing date 2018-07-31
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 201093-8
    ISSN 1618-2650 ; 0016-1152 ; 0372-7920
    ISSN (online) 1618-2650
    ISSN 0016-1152 ; 0372-7920
    DOI 10.1007/s00216-018-1288-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 69/97: Show issues
    Archiv 3: Show issues
    Z 9.4: Show issues

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  5. Article ; Online: The photo-Favorskii reaction of p-hydroxyphenacyl compounds is initiated by water-assisted, adiabatic extrusion of a triplet biradical.

    Givens, Richard S / Heger, Dominik / Hellrung, Bruno / Kamdzhilov, Yavor / Mac, Marek / Conrad, Peter G / Cope, Elizabeth / Lee, Jong I / Mata-Segreda, Julio F / Schowen, Richard L / Wirz, Jakob

    Journal of the American Chemical Society

    2008  Volume 130, Issue 11, Page(s) 3307–3309

    MeSH term(s) Benzyl Alcohols/chemical synthesis ; Benzyl Alcohols/chemistry ; Free Radicals/chemistry ; Free Radicals/radiation effects ; Molecular Structure ; Phenylacetates/chemical synthesis ; Phenylacetates/chemistry ; Phenylacetates/radiation effects ; Photochemistry ; Quantum Theory ; Ultraviolet Rays ; Water/chemistry
    Chemical Substances Benzyl Alcohols ; Free Radicals ; Phenylacetates ; Water (059QF0KO0R) ; 4-hydroxybenzyl alcohol (1A3AH1FP1B) ; 4-hydroxyphenylacetic acid (3J9SHG0RCN)
    Language English
    Publishing date 2008-02-22
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/ja7109579
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 55/32: Show issues
    Z 7.3: Show issues

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