Relevant bibliographies by topics / Thermal hydrolysis-methylation

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Thermal hydrolysis-methylation'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Thermal hydrolysis-methylation"

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Hendricker, Alan D., and Kent J. Voorhees. "Amino acid and oligopeptide analysis using Curie-point pyrolysis mass spectrometry with in-situ thermal hydrolysis and methylation: mechanistic considerations." Journal of Analytical and Applied Pyrolysis 48, no. 1 (November 1998): 17–33. http://dx.doi.org/10.1016/s0165-2370(98)00100-4.

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Watanabe, Atsushi, Chu Watanabe, Robert Freeman, Mari Nakajima, Norio Teramae, and Hajime Ohtani. "QUANTITATIVE ANALYSIS OF FATTY ACIDS IN VULCANIZED STYRENE–BUTADIENE RUBBER BY THERMAL DESORPTION AND THERMALLY ASSISTED HYDROLYSIS AND METHYLATION-GC/MS." Rubber Chemistry and Technology 87, no. 3 (September 1, 2014): 516–25. http://dx.doi.org/10.5254/rct.14.86941.

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ABSTRACT Determination of stearic acid in rubber is very important from the viewpoint of quality control of products. In place of the conventional liquid-phase extraction procedures for the analysis of additives in rubber, stearic and palmitic acids in vulcanized styrene–butadiene rubber (SBR) samples were directly analyzed in the solid state by thermal desorption (TD)–gas chromatography (GC)/mass spectrometry (MS) and thermally assisted hydrolysis and methylation (THM)–GC/MS. It was found that the precision of analytical data was only fair in the TD-GC/MS analysis, with 7.8% relative standard deviation (RSD), because of the interaction between the polar fatty acids and basic sites in the GC chromatographic system. On the other hand, THM-GC/MS, in which the fatty acids are derivatized to the methyl esters using tetramethylammonium hydroxide, can overcome this problem. Under the optimized measurement conditions of this study for THM-GC/MS, the average determined value (0.62 wt%) of total fatty acids in the SBR samples was found to agree well with the compounded amount (0.64 wt%) used in the preparation stage of the SBR samples, and the RSD was 3.2%.
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Purvis, Graham, Naoko Sano, Cees van der Land, Anders Barlow, Elisa Lopez-Capel, Peter Cumpson, James Hood, Jake Sheriff, and Neil Gray. "Combining thermal hydrolysis and methylation-gas chromatography/mass spectrometry with X-ray photoelectron spectroscopy to characterise complex organic assemblages in geological material." MethodsX 6 (2019): 2646–55. http://dx.doi.org/10.1016/j.mex.2019.10.034.

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Akoto, Lawrence, René J. J. Vreuls, Hubertus Irth, Virgilio Floris, Hans Hoogveld, and Roel Pel. "Determination of the carbon isotopic composition of whole/intact biological specimens using at-line direct thermal desorption to effect thermally assisted hydrolysis/methylation." Journal of Chromatography A 1186, no. 1-2 (April 2008): 372–79. http://dx.doi.org/10.1016/j.chroma.2007.08.082.

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Xu, M. "Repeatability and pattern recognition of bacterial fatty acid profiles generated by direct mass spectrometric analysis of in situ thermal hydrolysis/methylation of whole cells." Talanta 59, no. 3 (March 1, 2003): 577–89. http://dx.doi.org/10.1016/s0039-9140(02)00566-0.

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Madonna, Angelo J., Kent J. Voorhees, and Ted L. Hadfield. "Rapid detection of taxonomically important fatty acid methyl ester and steroid biomarkers using in situ thermal hydrolysis/methylation mass spectrometry (THM-MS): implications for bioaerosol detection." Journal of Analytical and Applied Pyrolysis 61, no. 1-2 (November 2001): 65–89. http://dx.doi.org/10.1016/s0165-2370(01)00136-x.

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Kim, Tae-Jip, Myo-Jeong Kim, Byung-Cheon Kim, Jae-Cherl Kim, Tae-Kyou Cheong, Jung-Wan Kim, and Kwan-Hwa Park. "Modes of Action of Acarbose Hydrolysis and Transglycosylation Catalyzed by a Thermostable Maltogenic Amylase, the Gene for Which Was Cloned from a ThermusStrain." Applied and Environmental Microbiology 65, no. 4 (April 1, 1999): 1644–51. http://dx.doi.org/10.1128/aem.65.4.1644-1651.1999.

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ABSTRACT A maltogenic amylase gene was cloned in Escherichia coli from a gram-negative thermophilic bacterium,Thermus strain IM6501. The gene encoded an enzyme (ThMA) with a molecular mass of 68 kDa which was expressed by the expression vector p6xHis119. The optimal temperature of ThMA was 60°C, which was higher than those of other maltogenic amylases reported so far. Thermal inactivation kinetic analysis of ThMA indicated that it was stabilized in the presence of 10 mM EDTA. ThMA harbored both hydrolysis and transglycosylation activities. It hydrolyzed β-cyclodextrin and starch mainly to maltose and pullulan to panose. ThMA not only hydrolyzed acarbose, an amylase inhibitor, to glucose and pseudotrisaccharide (PTS) but also transferred PTS to 17 sugar acceptors, including glucose, fructose, maltose, cellobiose, etc. Structural analysis of acarbose transfer products by using methylation, thin-layer chromatography, high-performance ion chromatography, and nuclear magnetic resonance indicated that PTS was transferred primarily to the C-6 of the acceptors and at lower degrees to the C-3 and/or C-4. The transglycosylation of sugar tomethyl-α-d-glucopyranoside by forming an α-(1,3)-glycosidic linkage was demonstrated for the first time by using acarbose and ThMA. Kinetic analysis of the acarbose transfer products showed that the C-4 transfer product formed most rapidly but readily hydrolyzed, while the C-6 transfer product was stable and accumulated in the reaction mixture as the main product.
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Xu, Ming, Franco Basile, and Kent J. Voorhees. "Differentiation and classification of user-specified bacterial groups by in situ thermal hydrolysis and methylation of whole bacterial cells with tert -butyl bromide chemical ionization ion trap mass spectrometry." Analytica Chimica Acta 418, no. 2 (August 2000): 119–28. http://dx.doi.org/10.1016/s0003-2670(00)00952-1.

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Hendricker, Alan D., Christy Abbas-Hawks, Franco Basile, Kent J. Voorhees, and Ted L. Hadfield. "Rapid chemotaxonomy of pathogenic bacteria using in situ thermal hydrolysis and methylation as a sample preparation step coupled with a field–portable membrane-inlet quadrupole ion trap mass spectrometer." International Journal of Mass Spectrometry 190-191 (August 1999): 331–42. http://dx.doi.org/10.1016/s1387-3806(98)14266-5.

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Leide, Jana, Klaas G. J. Nierop, Ann-Christin Deininger, Simona Staiger, Markus Riederer, and Jan W. de Leeuw. "Leaf cuticle analyses: implications for the existence of cutan/non-ester cutin and its biosynthetic origin." Annals of Botany 126, no. 1 (March 28, 2020): 141–62. http://dx.doi.org/10.1093/aob/mcaa056.

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Abstract Background and Aims The cuticle of a limited number of plant species contains cutan, a chemically highly resistant biopolymer. As yet, the biosynthesis of cutan is not fully understood. Attempting to further unravel the origin of cutan, we analysed the chemical composition of enzymatically isolated cuticular membranes of Agave americana leaves. Methods Cuticular waxes were extracted with organic solvents. Subsequently, the dewaxed cuticular membrane was depolymerized by acid-catalysed transesterification yielding cutin monomers and cutan, a non-hydrolysable, cuticular membrane residue. The cutan matrix was analysed by thermal extraction, flash pyrolysis and thermally assisted hydrolysis and methylation to elucidate the monomeric composition and deduce a putative biosynthetic origin. Key Results According to gas chromatography–mass spectrometry analyses, the cuticular waxes of A. americana contained primarily very-long-chain alkanoic acids and primary alkanols dominated by C32, whereas the cutin biopolyester of A. americana mainly consisted of 9,10-epoxy ω-hydroxy and 9,10,ω-trihydroxy C18 alkanoic acids. The main aliphatic cutan monomers were alkanoic acids, primary alkanols, ω-hydroxy alkanoic acids and alkane-α,ω-diols ranging predominantly from C28 to C34 and maximizing at C32. Minor contributions of benzene-1,3,5-triol and derivatives suggested that these aromatic moieties form the polymeric core of cutan, to which the aliphatic moieties are linked via ester and possibly ether bonds. Conclusions High similarity of aliphatic moieties in the cutan and the cuticular wax component indicated a common biosynthetic origin. In order to exclude species-specific peculiarities of A. americana and to place our results in a broader context, cuticular waxes, cutin and cutan of Clivia miniata, Ficus elastica and Prunus laurocerasus leaves were also investigated. A detailed comparison showed compositional and structural differences, indicated that cutan was only found in leaves of perennial evergreen A. americana and C. miniata, and made clear that the phenomenon of cutan is possibly less present in plant species than suggested in the literature.
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Dissertations / Theses on the topic "Thermal hydrolysis-methylation"

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Smith, Phillip R. "Generation of Biomarkers from Anthrax Spores by Catalysis and Analytical Pyrolysis." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1005.pdf.

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Book chapters on the topic "Thermal hydrolysis-methylation"

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Ohtani, Hajime, and Shin Tsuge. "Characterization of Condensation Polymers by Thermally Assisted Hydrolysis and Methylation-GC." In Analytical Pyrolysis Handbook, 219–38. 3rd ed. Third edition. | Boca Raton : CRC Press, 2021. | Revised edition of: Applied pyrolysis handbook / edited by Thomas P. Wampler. 2nd ed. c2007.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429201202-11-11.

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