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You searched for: Publication Year 2015 Remove constraint Publication Year: 2015 Subject cellulose Remove constraint Subject: cellulose Subject ionization Remove constraint Subject: ionization
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1. Effective evaluation of catalytic deoxygenation for in situ catalytic fast pyrolysis using gas chromatography–high resolution mass spectrometry

Author:
D. Paul Cole; Young Jin Lee
Source:
Journal of analytical and applied pyrolysis 2015 v.112 pp. 129-134
ISSN:
0165-2370
Subject:
atmospheric pressure; biofuels; catalysts; catalytic activity; cellulose; chemical composition; commercialization; databases; gas chromatography; ionization; mass spectrometry; pyrolysis
Abstract:
... Effective deoxygenation in catalytic fast pyrolysis (CFP) is crucial for bio-oil stabilization and its successful commercialization. Herein, we utilize a new analytical platform that couples gas chromatography (GC) to dopant-assisted atmospheric pressure chemical ionization (dAPCI) time-of-flight mass spectrometry (TOF MS) to evaluate catalytic deoxygenation of cellulose pyrolysis. Soft ionization ...
DOI:
10.1016/j.jaap.2015.02.008

2. Homogeneous benzoylation of cellulose in 1-allyl-3-methylimidazolium chloride: Hammett correlation, mechanism and regioselectivity

Author:
Weiwei Chen; Ye Feng; Mei Zhang; Jin Wu; Jinming Zhang; Xia Gao; Jiasong He; Jun Zhang
Source:
RSC advances 2015 v.5 no.72 pp. 58536-58542
ISSN:
2046-2069
Subject:
cellulose; chlorides; esters; ionic liquids; ionization; nuclear magnetic resonance spectroscopy; organochlorine compounds; reaction mechanisms; regioselectivity; synergism
Abstract:
... Homogeneous benzoylation of cellulose with a series of substituted benzoyl chlorides, in which substituents varied from electron donating to electron withdrawing groups, was investigated in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl). The electronic effect of substituents had a considerable effect on the reaction. A plot of Hammett parameters of substituents vs. degree of substit ...
DOI:
10.1039/c5ra08911e

3. Personalized monitoring of therapeutic salicylic acid in dried blood spots using a three-layer setup and desorption electrospray ionization mass spectrometry

Author:
Markus Siebenhaar; Kai Küllmer; Nuno Miguel de Barros Fernandes; Volker Hüllen; Carsten Hopf
Source:
Analytical and bioanalytical chemistry 2015 v.407 no.23 pp. 7229-7238
ISSN:
1618-2642
Subject:
aspirin; blood; cellulose; desorption; detection limit; electrospray ionization mass spectrometry; ionization; monitoring; patients; pharmacokinetics; salicylic acid; volunteers
Abstract:
... Desorption electrospray ionization (DESI) mass spectrometry is an emerging technology for direct therapeutic drug monitoring in dried blood spots (DBS). Current DBS methods require manual application of small molecules as internal standards for absolute drug quantification. With industrial standardization in mind, we superseded the manual addition of standard and built a three-layer setup for robu ...
DOI:
10.1007/s00216-015-8887-8

4. Phenolic composition and antioxidant activity of kenaf leaves

Author:
Andreia Pascoal; Rosa Quirantes-Piné; Ana Luisa Fernando; Efi Alexopoulou; Antonio Segura-Carretero
Source:
Industrial crops and products 2015 v.78 pp. 116-123
ISSN:
0926-6690
Subject:
Hibiscus cannabinus; antioxidants; biopharmaceuticals; cellulose; chemical composition; chlorogenic acid; functional foods; herbaceous plants; high performance liquid chromatography; ionization; kaempferol; kenaf; leaf extracts; leaves; mass spectrometry; oxygen radical absorbance capacity; phenolic compounds; quercetin; seeds; Portugal
Abstract:
... Kenaf (Hibiscus cannabinus L.) is a short day, annual, herbaceous plant producing high quality cellulose. Kenaf is a valuable fiber crop that is cultivated for its fibrous stem. Recently, seeds and leaves have been also considered as a source of industrial products, such as biopharmaceuticals. However, their pharmacological effects and chemical composition are still poorly studied.In this context, ...
DOI:
10.1016/j.indcrop.2015.10.028

5. Subcritical Water: A Method for Green Production of Cellulose Nanocrystals

Author:
Novo Lísias P.; Bras Julien; García Araceli; Belgacem Naceur; Curvelo Antonio A. S.
Source:
ACS sustainable chemistry 2015 v.3 no.11 pp. 2839-2846
ISSN:
2168-0485
Subject:
X-ray diffraction; acids; cellulose; corrosion; crystal structure; extrusion; heat tolerance; hemicellulose; hydrolysis; industrialization; ionization; nanocrystals; temperature; thermal stability; washing
Abstract:
... In the present study, an innovative method to produce cellulose nanocrystals is proposed. The conventional production of nanocrystals uses concentrated solutions of strong acids to promote the hydrolysis of cellulose amorphous regions and hemicelluloses. However, in the conventional method, long duration washing steps and the nanocrystals low temperature resistance still limit their larger industr ...
DOI:
10.1021/acssuschemeng.5b00762

6. A novel solid-state fractionation of naphthenic acid fraction components from oil sands process-affected water

Author:
Mohamed H. Mohamed; Lee D. Wilson; Jaimin R. Shah; Jon Bailey; Kerry M. Peru; John V. Headley
Source:
Chemosphere 2015 v.136 pp. 252-258
ISSN:
0045-6535
Subject:
Acacia; activated carbon; atomic absorption spectrometry; biochar; biomass; cellulose; cost effectiveness; electrospray ionization mass spectrometry; fractionation; goethite; ionization; leaching; magnetite; methanol; naphthenates; oil sands; oils; potassium; rice hulls; solvents; temperature
Abstract:
... Various sorbent materials were evaluated for the fractionation of naphthenic acid fraction components (NAFCs) from oil sand process-affected water (OSPW). The solid phase materials include activated carbon (AC), cellulose, iron oxides (magnetite and goethite), polyaniline (PANI) and three types of biochar derived from biomass (BC-1; rice husks, BC-2; acacia low temperature and BC-3; acacia high te ...
DOI:
10.1016/j.chemosphere.2015.05.029

7. Anticodeine aptamer immobilized on a Whatman cellulose paper for thin-film microextraction of codeine from urine followed by electrospray ionization ion mobility spectrometry

Author:
Zahra Hashemian; Taghi Khayamian; Mohammad Saraji
Source:
Analytical and bioanalytical chemistry 2015 v.407 no.6 pp. 1615-1623
ISSN:
1618-2642
Subject:
cellulose; codeine; detection limit; high performance liquid chromatography; infrared spectroscopy; ionization; microextraction; oligonucleotides; paper; solvents; temperature; urine
Abstract:
... A combination of thin-film microextaction based on an aptamer immobilized on modified Whatman cellulose paper followed by electrospray ionization ion mobility spectrometry has been developed for the analysis of codeine in urine samples. The immobilization is based on the covalent linking of an amino-modified anticodeine aptamer to aldehyde groups of the oxidized cellulose paper. The covalent bonds ...
DOI:
10.1007/s00216-014-8392-5

8. Influence of atmospheric pressure plasma treatments on the surface properties of ligno-cellulosic substrates

Author:
William P. Lekobou; Karl R. Englund; Marie-Pierre Laborie; Patrick D. Pedrow
Source:
Holzforschung 2015 v.70 no.1 pp. 55-61
ISSN:
1437-434X
Subject:
Betula; Pinus; acetylene; argon (noble gases); atmospheric pressure; capillarity; cellulose; coatings; electrodes; equations; hydrophilicity; hydrophobicity; ionization; paper; topography; wettability; wood flour
Abstract:
... The paper aims at the investigation of atmospheric pressure weakly ionized plasmas with argon and acetylene to deposit plasma-polymerized coatings on wood veneers (birch, maple), cellulose paper, and pine wood flour to modify their surface properties, in particular their topography and wettability. The treatment was performed in a reactor containing an array of high-voltage needles and a grounded ...
DOI:
10.1515/hf-2014-0211

9. Isolation and identification of a whey protein-sourced calcium-binding tripeptide Tyr-Asp-Thr

Author:
Lina Zhao; Xixi Cai; Shunli Huang; Shaoyun Wang; Yifan Huang; Jing Hong; Pingfan Rao
Source:
International dairy journal 2015 v.40 pp. 16-23
ISSN:
0958-6946
Subject:
amino acid sequences; anion exchange chromatography; binding sites; calcium; cellulose; chelates; dietary supplements; gel chromatography; high performance liquid chromatography; hydrolysates; ionization; mass spectrometry; molecular weight; oxygen; protein hydrolysates; whey; whey protein
Abstract:
... A tripeptide peptide with strong calcium-binding capacity was isolated and purified from whey protein hydrolysates using diethylaminoethyl cellulose anion-exchange chromatography, Sephadex G-25 gel filtration, semi-preparative reversed-phase (RP) high-performance liquid chromatography (HPLC) and analytical HPLC. It was identified using liquid chromatography-electrospray ionisation mass spectrometr ...
DOI:
10.1016/j.idairyj.2014.08.013

10. Mass Spectrometry and Nuclear Magnetic Resonance Spectroscopy Study of Carbohydrate Decomposition by Hydrothermal Liquefaction Treatment: A Modeling Approach on Bio-oil Production from Organic Wastes

Author:
Croce Annamaria; Battistel Ezio; Chiaberge Stefano; Spera Silvia; Reale Samantha; De Angelis Francesco
Source:
Energy & Fuels 2015 v.29 no.9 pp. 5847-5856
ISSN:
1520-5029
Subject:
atmospheric pressure; biofuels; cellulose; decarboxylation; furfural; gas chromatography-mass spectrometry; gases; glucose; ionization; liquefaction; models; nuclear magnetic resonance spectroscopy; organic wastes; oxidation; polymerization; stable isotopes
Abstract:
... Glucose and cellulose as model compounds were treated under hydrothermal liquefaction (HTL) conditions to describe the main reaction pathways that are involved in the process. The HTL-derived phases (gas phase, bio-oil, aqueous phase, and solid residue) were fully characterized by a combination of analytical techniques [i.e., elemental analysis (EA), gas chromatography–mass spectrometry (GC–MS), e ...
DOI:
10.1021/acs.energyfuels.5b01204

11. Miniature Flow-Through Low-Temperature Plasma Ionization Source for Ambient Ionization of Gases and Aerosols

Author:
Spencer Sandra E.; Santiago Brandon G.; Glish Gary L.
Source:
Analytical chemistry 2015 v.87 no.23 pp. 11887-11892
ISSN:
1520-6882
Subject:
aerosols; caffeine; cellulose; gases; ionization; ions; pyrolysis
Abstract:
... The design and operation of an inexpensive, miniature low-temperature plasma ion source is detailed. The miniature low-temperature plasma ion source is operated in a “flow-through” configuration, wherein the gaseous or aerosolized analyte, caffeine or pyrolyzed ethyl cellulose, in a carrier gas is used as the plasma gas. In this flow-through configuration, the sensitivity for the caffeine standard ...
DOI:
10.1021/acs.analchem.5b03447

12. A critique on the structural analysis of lignins and application of novel tandem mass spectrometric strategies to determine lignin sequencing

Author:
Joseph Banoub; Guo‐Hua Delmas Jr.; Nicolas Joly; Grahame Mackenzie; Nadja Cachet; Bouchra Benjelloun‐Mlayah; Michel Delmas
Source:
Journal of mass spectrometry 2015 v.50 no.1 pp. 5-48
ISSN:
1076-5174
Subject:
atmospheric pressure; biomass; cellulose; cellulosic fibers; chemical structure; chemical treatment; desorption; enzymatic hydrolysis; hemicellulose; hydrolysis; ionization; lignin; lignocellulose; mass spectrometry; molecular weight; vegetables
Abstract:
... This review is devoted to the application of MS using soft ionization methods with a special emphasis on electrospray ionization, atmospheric pressure photoionization and matrix‐assisted laser desorption/ionization MS and tandem MS (MS/MS) for the elucidation of the chemical structure of native and modified lignins. We describe and critically evaluate how these soft ionization methods have contrib ...
DOI:
10.1002/jms.3541