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1. Overview of Biochemical Assays in Lipidic Cubic Phase

Author:
Lan, Zhu; Lee, Ming-Yue; Chun, Eugene; Liu, Bin; Liu, Wei
Source:
Trends in biochemical sciences 2019 v.44 no.4 pp. 295-299
ISSN:
0968-0004
Subject:
chemical analysis,   etc   ; lipids; membrane proteins;     Show all 3 Subjects
Abstract:
... The development of novel biochemical methods to efficiently characterize membrane protein (MP) properties in lipidic cubic phase (LCP) is important for studying complicated MPs and their multimeric complexes. Here, we summarize recent LCP-related assays and provide an outlook on their applications in structure and function studies of MPs. ...
DOI:
10.1016/j.tibs.2018.08.008

2. Continuous online process analytics with multiplexing gas chromatography by using calibrated convolution matrices

Author:
Wunsch, Marco R.; Reiter, Alexander M.C.; Schuster, Felix S.; Lehnig, Rudolf; Trapp, Oliver
Source:
Journal of chromatography 2019 v.1595 pp. 180-189
ISSN:
0021-9673
Subject:
chemical analysis,   etc   ; calibration; gas chromatography; quantitative analysis;     Show all 4 Subjects
Abstract:
... The development of fast and precise measurement techniques for process analytical technology is important to operate chemical processes safely and efficiently. For quantitative measurements of multiple components at a trace level, often gas chromatographic methods are used which have a response time of several minutes or of up to one hour. For fast changing processes, this can be too slow for effi ...
DOI:
10.1016/j.chroma.2019.02.034

3. The development of a future chemical compatibility standard for energetic materials

Author:
Bouma, Richard H.B.; Griffiths, Trevor T.; Tuukkanen, Irmeli M.
Source:
Thermochimica acta 2019 v.676 pp. 13-19
ISSN:
0040-6031
Subject:
chemical analysis,   etc   ; calorimetry; explosives; heat flow; temperature;     Show all 5 Subjects
Abstract:
... To ensure safety and reliability, it is important that the explosives and other materials used in munitions do not interact adversely either physically or chemically. Data obtained by heat flow calorimetry on nitrocellulose-based propellants have been reviewed with the aim of identifying improved chemical compatibility assessment criteria.It was shown that relative and absolute assessment techniqu ...
DOI:
10.1016/j.tca.2019.03.012

4. Analytical reliability of simple, rapid, minuturizated, direct analytical processes: A call to arms

Author:
Soriano, María Laura; Zougagh, Mohammed; Ríos, Ángel; Valcárcel, Miguel
Source:
Trends in analytical chemistry 2019 v.114 pp. 98-107
ISSN:
0165-9936
Subject:
chemical analysis,   etc   ; chemical reactions; rapid methods;     Show all 3 Subjects
Abstract:
... There is an urgent need to assure the quality of the results provided by rapid, simple and direct analytical processes, ordinary not involving sample preparation steps. These analytical systems, sometimes called “tests methods”, which are of increasing importance in the production of data, information and knowledge, are outlined here. To support this goal, an analytical property named “reliability ...
DOI:
10.1016/j.trac.2019.03.005

5. Heterogeneous photocatalysts: an overview of classic and modern approaches for optical, electronic, and charge dynamics evaluation

Author:
TanPresent address: Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan. E-mail: hui.ling.tan.291@m.kyushu-u.ac.jp, Hui Ling; Abdi, Fatwa F.; Ng, Yun Hau
Source:
Chemical Society reviews 2019 v.48 no.5 pp. 1255-1271
ISSN:
1460-4744
Subject:
chemical analysis,   etc   ; electrodes; electrons; photocatalysts; semiconductors;     Show all 5 Subjects
Abstract:
... The functionality of a photoactive semiconductor (i.e., photocatalysts, photoelectrodes, etc.) is largely dictated by three key aspects: (i) band gap; (ii) absolute potentials of the conduction band minimum and the valence band maximum; and (iii) bulk and surface charge carrier dynamics. Their relevance to governing the energetics and the photo(electro)chemical mechanisms of the semiconductor has ...
DOI:
10.1039/c8cs00882e

6. Metal applications of liquid-phase microextraction

Author:
Aguirre, Miguel Ángel; Baile, Paola; Vidal, Lorena; Canals, Antonio
Source:
Trends in analytical chemistry 2019 v.112 pp. 241-247
ISSN:
0165-9936
Subject:
chemical analysis,   etc   ; automation; liquid-phase microextraction; metals;     Show all 4 Subjects
Abstract:
... This review focuses on the combination of elemental detection techniques with liquid-phase microextraction (LPME), namely, single drop microextraction, hollow fiber based liquid-phase microextraction, dispersive liquid-liquid microextraction, and related techniques. General features of different microextraction procedures, historical overview and automation of LPME are described and compared, alon ...
DOI:
10.1016/j.trac.2018.11.032

7. Some theoretical considerations on preparative separation with orthogonal pressurised planar electrochromatography

Author:
Gajos, Rafał; Polak, Beata; Dzido, Tadeusz H.
Source:
Journal of separation science 2019 v.42 no.4 pp. 933-946
ISSN:
1615-9306
Subject:
chemical analysis,   etc   ; electrochromatography; simulation models; theoretical models;     Show all 4 Subjects
Abstract:
... In this work, separation of multicomponent mixtures containing components with the same and different electrophoretic mobility by using orthogonal pressurised planar electrochromatography is studied theoretically. Additionally, a simple way for determination of a maximum amount of mixture causing volume overload of flat/planar columns used in this technique is presented. In the next stage, effects ...
DOI:
10.1002/jssc.201800720

8. Tannins extraction: A key point for their valorization and cleaner production

Author:
de Hoyos-Martínez, Pedro L.; Merle, Juliette; Labidi, Jalel; Charrier – El Bouhtoury, Fatima
Source:
Journal of cleaner production 2019 v.206 pp. 1138-1155
ISSN:
0959-6526
Subject:
chemical analysis,   etc   ; extraction; feedstocks; industrial applications; tannins;     Show all 5 Subjects
Abstract:
... Tannins are phenolic compounds with considerable abundance in nature. They have attracted significant attention lately owing to their huge variety of potential applications. Accordingly, the tannin-related activity in terms of research has undergone a great boost, especially as green feedstock for materials in several fields. Nevertheless, the extraction process remains as the main bottleneck for ...
DOI:
10.1016/j.jclepro.2018.09.243

9. Threshold-Based Quantification in a Multiline Lateral Flow Assay via Computationally Designed Capture Efficiency

Author:
Gasperino, David J.; Leon, Daniel; Lutz, Barry; Cate, David M.; Nichols, Kevin P.; Bell, David; Weigl, Bernhard H.
Source:
Analytical chemistry 2018 v.90 no.11 pp. 6643-6650
ISSN:
1520-6882
Subject:
chemical analysis,   etc   ; models; prediction;     Show all 3 Subjects
Abstract:
... Lateral flow assays (LFAs) are widely used for yes/no detection of analytes, but they are not well-suited for quantification. We show that the sensitivity of the test line in a lateral flow assay can be tuned to appear at a specific sample concentration by varying the density of capture molecules at the test line and that when test lines tuned for different responses are combined into a single tes ...
DOI:
10.1021/acs.analchem.8b00440

10. A New Isoflavane from Suaeda glauca

Author:
Wang, Qizhi; Qiu, Ping; Guan, Fuqin; Shan, Yu; Yin, Min; Feng, Xu; Liu, Fei
Source:
Chemistry of natural compounds 2018 v.54 no.1 pp. 38-40
ISSN:
0009-3130
Subject:
chemical analysis,   etc   ; Suaeda; isoflavans;     Show all 3 Subjects
Abstract:
... A new isoflavane, 6,2′-dihydroxy-5,7-dimethoxyisoavanone (1), was isolated from the herb Suaeda glauca (Bunge) Bunge (Chenopodiaceae), in addition to six known compounds (2–7). The structures of the compounds were determined using chemical and spectral methods. ...
DOI:
10.1007/s10600-018-2254-x

11. Benchmarking machine learning methods for comprehensive chemical fingerprinting and pattern recognition

Author:
Reichenbach, Stephen E.; Zini, Claudia A.; Nicolli, Karine P.; Welke, Juliane E.; Cordero, Chiara; Tao, Qingping
Source:
Journal of chromatography 2019 v.1595 pp. 158-167
ISSN:
0021-9673
Subject:
chemical analysis,   etc   ; artificial intelligence; chromatography; data collection; wine industry; wines;     Show all 6 Subjects
Abstract:
... Machine learning (ML) has been used previously to recognize particular patterns of constituent compounds. Here, ML is used with comprehensive chemical fingerprints that capture the distribution of all constituent compounds to flexibly perform various pattern recognition tasks. Such pattern recognition requires a sequence of chemical analysis, data analysis, and pattern analysis. Chemical analysis ...
DOI:
10.1016/j.chroma.2019.02.027

12. The beginning of faience in China: A review and new evidence

Author:
Lin, Yi-Xian; Rehren, Thilo; Wang, Hui; Ren, Xiao-Yan; Ma, Jian
Source:
Journal of archaeological science 2019 v.105 pp. 97-115
ISSN:
0305-4403
Subject:
chemical analysis,   etc   ; archaeology; pastoralism; steppes; Caucasus region; China;     Show all 6 Subjects
Abstract:
... Despite decades of research into faience artefacts in China, many questions remain about how, where and by whom this technology began. This study combines published and new results of chemical analysis, morphology and chronology of the earliest faience beads uncovered from Xinjiang, Qinghai, Gansu, Shaanxi and Shanxi to suggest that at the latest in the mid-second millennium BC faience was first i ...
DOI:
10.1016/j.jas.2019.03.007

13. Design and reactivity of pentapyridyl metal complexes for ammonia oxidation

Author:
Johnson, Samantha I.; Heins, Spencer P.; Klug, Christina M.; Wiedner, Eric S.; Bullock, R. Morris; Raugei, Simone
Source:
Chemical communications 2019 v.55 no.35 pp. 5083-5086
ISSN:
1364-548X
Subject:
chemical analysis,   etc   ; ammonia; hydrogen; molybdenum; nitrogen; oxidation; quantum mechanics;     Show all 7 Subjects
Abstract:
... Oxidation of NH₃ to N₂ by pentapyridyl metal complexes via hydrogen atom abstraction was investigated computationally. Quantum chemical analysis reveals insights on orbital symmetry requirements for efficient NH₃ oxidation. The most promising complex, [(PY5)Mo(NH₃)]²⁺, was studied experimentally. It shows conversion of NH₃ to N₂ upon treatment with 2,4,6-tri-tert-butylphenoxyl radical. ...
DOI:
10.1039/c9cc01249d

14. The oldest osseous mining tools in Europe? New discoveries from the chocolate flint mine in Orońsko, site 2 (southern Poland)

Author:
Osipowicz, Grzegorz; Kerneder-Gubała, Katarzyna; Bosiak, Mariusz; Makowiecki, Daniel; Orłowska, Justyna
Source:
Quaternary international 2019 v.512 pp. 82-98
ISSN:
1040-6182
Subject:
chemical analysis,   etc   ; chocolate; limestone; mining; raw materials; Poland;     Show all 6 Subjects
Abstract:
... This article presents the results of the traceological, experimental, physico-chemical and archaeozoological analyses undertaken on bone artefacts from one of the oldest known flint mines, i.e. the chocolate flint mine in Orońsko, Site 2, Poland. Based on typological and 11 radiocarbon measurements, the mine dates to the end of the Alleröd period and the early Younger Dryas. The results of the tra ...
DOI:
10.1016/j.quaint.2019.02.005

15. Local Li-ion conductivity changes within Al stabilized Li₇La₃Zr₂O₁₂ and their relationship to three-dimensional variations of the bulk composition

Author:
Smetaczek, Stefan; Wachter-Welzl, Andreas; Wagner, Reinhard; Rettenwander, Daniel; Amthauer, Georg; Andrejs, Lukas; Taibl, Stefanie; Limbeck, Andreas; Fleig, Jürgen
Source:
Journal of materials chemistry A 2019 v.7 no.12 pp. 6818-6831
ISSN:
2050-7496
Subject:
chemical analysis,   etc   ; aluminum; cations; chemical composition; electrochemistry; oxygen; spectroscopy; stoichiometry;     Show all 8 Subjects
Abstract:
... The attractiveness of cubic Li₇La₃Zr₂O₁₂ (LLZO) based garnets lies in their high ionic conductivity and the combination of thermal and electrochemical stability. However, relationships between the exact chemical composition and ionic conductivity are still not well understood and samples of very similar composition and processing may show very different properties. In this contribution, we investi ...
DOI:
10.1039/c9ta00356h

16. A Portable Atomic Emission Spectrometer Based on a Drop-Spark Discharge for Analyzing Solutions

Author:
Yagov, V. V.; Korotkov, A. S.; Zhirkov, A. A.; Pogonin, V. I.; Zuev, B. K.
Source:
Journal of analytical chemistry 2019 v.74 no.3 pp. 270-275
ISSN:
1061-9348
Subject:
chemical analysis,   etc   ; atomic absorption spectrometry; portable equipment; spectrometers;     Show all 4 Subjects
Abstract:
... A portable instrument for analysis of solutions by atomic emission spectrometry is described based on recording the emission spectrum of a drop-spark discharge using a Maya 2000 Pro spectrometer (Ocean Optics, United States). ...
DOI:
10.1134/S1061934819030122

17. Long and short-term magma differentiation at Mt. Etna as revealed by Sr-Nd isotopes and geochemical data

Author:
Di Renzo, V.; Corsaro, R.A.; Miraglia, L.; Pompilio, M.; Civetta, L.
Source:
Earth-science reviews 2019 v.190 pp. 112-130
ISSN:
0012-8252
Subject:
chemical analysis,   etc   ; data collection; isotopes; mixing; strontium; Italy; Sicily;     Show all 7 Subjects
Abstract:
... Mt. Etna, in Sicily (Italy), produces effusive and explosive eruptions from summit craters and flanks. Petrology of erupted products has proved fundamental to explore the relationship between magma dynamics within the plumbing system and eruptive styles. Data of SrNd isotopes are quite scarce if compared with the great number of chemical analyses carried out in products of last decades. We measure ...
DOI:
10.1016/j.earscirev.2018.12.008

18. Investigation of handheld laser induced breakdown spectroscopy (HH LIBS) for the analysis of beryllium on swipe surfaces

Author:
Manard, Benjamin T.; Schappert, Michael F.; Wylie, E. Miller; McMath, Garrett E.
Source:
Analytical methods 2019 v.11 no.6 pp. 752-759
ISSN:
1759-9679
Subject:
chemical analysis,   etc   ; atomic absorption spectrometry; beryllium; fluorescence emission spectroscopy; hygiene;     Show all 5 Subjects
Abstract:
... Handheld laser induced breakdown spectroscopy (HH LIBS) was explored for its feasibility to perform rapid, semi-quantitative analysis of beryllium (Be) on fibrous swipe materials which could prove to be impactful for industrial hygiene (IH) based applications. Here, the HH LIBS methodology was compared to established methods including inductively coupled plasma-optical emission spectroscopy and fl ...
DOI:
10.1039/c8ay02473a

19. Chemical Imaging in Vivo: Photoacoustic-Based 4-Dimensional Chemical Analysis

Author:
Lee, Chang H.; Folz, Jeff; Tan, Joel W. Y.; Jo, Janggun; Wang, Xueding; Kopelman, Raoul
Source:
Analytical chemistry 2019 v.91 no.4 pp. 2561-2569
ISSN:
1520-6882
Subject:
chemical analysis,   etc   ; drug therapy; image analysis; immunotherapy; neoplasms; patients;     Show all 6 Subjects
Abstract:
... We describe how 4-dimensional in vivo biochemical analysis can be performed using photoacoustic contrast nanoagents that have been designed to probe both structural and chemical information in vivo, enabling noninvasive, real time, spatially resolved chemical imaging. Early chemical imaging of a patient’s tumor can inform the decision of effective treatment, regarding choices of chemotherapy, radi ...
DOI:
10.1021/acs.analchem.8b04797

20. From lignin to valuable products–strategies, challenges, and prospects

Author:
Wang, Hongliang; Pu, Yunqiao; Ragauskas, Arthur; Yang, Bin
Source:
Bioresource technology 2019 v.271 pp. 449-461
ISSN:
0960-8524
Subject:
chemical analysis,   etc   ; biomass; biorefining; carbon; lignin; mineral resources; profitability;     Show all 7 Subjects
Abstract:
... The exploration of effective approaches for the valorization of lignin to valuable products attracts broad interests of a growing scientific community. By fully unlocking the potential of the world’s most abundant resource of bio-aromatics, it could improve the profitability and carbon efficiency of the entire biorefinery process, thus accelerate the replacement of fossil resources with bioresourc ...
DOI:
10.1016/j.biortech.2018.09.072