Artykuły w czasopismach: „Organic compounds – Analysis”

1

Ewinger, H. P., J. Goschnick i H. J. Ache. "Analysis of organic compounds with SNMS". Fresenius' Journal of Analytical Chemistry 341, nr 1-2 (1991): 17–19. http://dx.doi.org/10.1007/bf00322099.

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Dodson, R. E., J. I. Levy, J. P. Shine, J. D. Spengler i D. H. Bennett. "Indoor Source Analysis of Volatile Organic Compounds". Epidemiology 17, Suppl (listopad 2006): S352—S353. http://dx.doi.org/10.1097/00001648-200611001-00935.

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Mercader, Andrew G., Pablo R. Duchowicz, Miguel A. Sanservino, Francisco M. Fernández i Eduardo A. Castro. "QSPR analysis of fluorophilicity for organic compounds". Journal of Fluorine Chemistry 128, nr 5 (maj 2007): 484–92. http://dx.doi.org/10.1016/j.jfluchem.2006.12.011.

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Reeves, Eoghan P., i Jens Fiebig. "Abiotic Synthesis of Methane and Organic Compounds in Earth’s Lithosphere". Elements 16, nr 1 (1.02.2020): 25–31. http://dx.doi.org/10.2138/gselements.16.1.25.

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Accumulation of molecular hydrogen in geologic systems can create conditions energetically favorable to transform inorganic carbon into methane and other organic compounds. Although hydrocarbons with a potentially abiotic origin have been proposed to form in a number of crustal settings, the ubiquitous presence of organic compounds derived from biological organic matter presents a challenge for unambiguously identifying abiotic organic molecules. In recent years, extensive analysis of methane and other organics in diverse geologic fluids, combined with novel isotope analyses and laboratory simulations, have, however, yielded insights into the distribution of specific abiotic organic molecules in Earth’s lithosphere and the likely conditions and pathways under which they form.

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SOBOLEVA, E. A., Ya A. VISURKHANOVA, N. M. IVANOVA, М. Е. BEISENBEKOVA i S. O. KENZHETAEVA. "ULTRAFINECOPPER AND NICKEL POWDERS INTHE ELECTRO-CATALYTICHYDROGENATIONOF ORGANIC COMPOUNDS". Chemical Journal of Kazakhstan 74, nr 2 (30.06.2021): 32–48. http://dx.doi.org/10.51580/2021-1/2710-1185.26.

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Ultrafine copper and nickel powders are synthesized by a chemical reduction of the metal cations from their salts in an aqueous ethanol solution without and with the addition of a polymer stabilizer (polyvinylpyrrolidone and polyvinyl alcohol). The structure and morphological features of the prepared metal powders were investigated by X-ray phase analysis and electron microscopy. The electrocatalytic properties of the Cu and Ni powders have been studied in the electrohydrogenation of acetophenone, nitrobenzene, p-nitroaniline, and cyclohexanone. A higher electrocatalytic activity of Cu powders, as well as skeletal copper, was established in the electrohydrogenation of the first three of the listed compounds in comparison with nickel powders, which is explained by the ability of copper cations to be reduced from its oxides in the electrochemical system under investigation. It is shown that the use of polymer stabilizers in the synthesis of Cu and Ni powders contributes to reducing metal particle sizes, but does not increase the electrocatalytic activity of the corresponding metal powders.

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Ren, Shijun, Arima Das i Eric Lien. "QSAR analysis of membrane permeability to organic compounds". Journal of Drug Targeting 4, nr 2 (styczeń 1996): 103–7. http://dx.doi.org/10.3109/10611869609046268.

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Hušák, M., i J. Had. "Quantitative Analysis of Organic Compounds by Rietveld Method". Materials Science Forum 166-169 (lipiec 1994): 745–48. http://dx.doi.org/10.4028/www.scientific.net/msf.166-169.745.

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Mishima, Satoko, i Tsutomu Nakagawa. "Analysis of Hydrophilic Volatile Organic Compounds by Pervaporation." membrane 25, nr 3 (2000): 130–34. http://dx.doi.org/10.5360/membrane.25.130.

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Aragón, P., J. Atienza i M. D. Climent. "Analysis of Organic Compounds in Air: A Review". Critical Reviews in Analytical Chemistry 30, nr 2-3 (kwiecień 2000): 121–51. http://dx.doi.org/10.1080/10408340091164207.

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Mestres, M., O. Busto i J. Guasch. "Analysis of organic sulfur compounds in wine aroma". Journal of Chromatography A 881, nr 1-2 (czerwiec 2000): 569–81. http://dx.doi.org/10.1016/s0021-9673(00)00220-x.

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Dewulf, Jo, Herman Van Langenhove i Gyula Wittmann. "Analysis of volatile organic compounds using gas chromatography". TrAC Trends in Analytical Chemistry 21, nr 9-10 (wrzesień 2002): 637–46. http://dx.doi.org/10.1016/s0165-9936(02)00804-x.

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12

Brauch, H. J. "The analysis of polar organic compounds in water". Fresenius' Journal of Analytical Chemistry 343, nr 1 (1992): 6–7. http://dx.doi.org/10.1007/bf00331935.

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Ferrey, Mark L., i Rex E. Lovrien. "Microbial calorimetric analysis (MCA) of aqueous organic compounds". Talanta 40, nr 2 (luty 1993): 127–34. http://dx.doi.org/10.1016/0039-9140(93)80311-e.

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Lewis, T. E., A. B. Crockett i R. L. Siegrist. "Soil sampling and analysis for volatile organic compounds". Environmental Monitoring and Assessment 30, nr 3 (maj 1994): 213–46. http://dx.doi.org/10.1007/bf00546202.

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Snethlage, H. C. S. "Oxidimetric analysis of binary mixtures of organic compounds". Recueil des Travaux Chimiques des Pays-Bas 55, nr 1 (3.09.2010): 58–60. http://dx.doi.org/10.1002/recl.19360550109.

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Spokas, Kurt A., Jeffrey M. Novak, Catherine E. Stewart, Keri B. Cantrell, Minori Uchimiya, Martin G. DuSaire i Kyoung S. Ro. "Qualitative analysis of volatile organic compounds on biochar". Chemosphere 85, nr 5 (październik 2011): 869–82. http://dx.doi.org/10.1016/j.chemosphere.2011.06.108.

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Gruenheid, S., U. Huebner i M. Jekel. "Impact of temperature on biodegradation of bulk and trace organics during soil passage in an indirect reuse system". Water Science and Technology 57, nr 7 (1.04.2008): 987–94. http://dx.doi.org/10.2166/wst.2008.207.

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Investigations on the behavior of bulk organics and trace organic compounds in a temperature controlled soil column system are reported. Objective of the research was to assess the importance of temperature for the degradation of bulk and trace organics. The analysis of the bulk organic behavior showed a fast mineralization of easily degradable organic carbon in the first few centimetres of the columns, which does not seem to be temperature-dependent. Along the further infiltration path an influence of the different temperatures on the bioactivity was clearly visible. However, a significant increase of mineralization potential of bulk organic compounds with increasing temperature was shown. The monitoring of the single organic pollutants Iopromide, Sulfamethoxazole and naphthalenedisulfonic acids showed that temperature has an influence on the degradation behavior of the monitored compounds. In most cases higher temperatures increased the mineralization potential.

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Suzuki, Norimichi, Hiroko Nakaoka, Masamichi Hanazato, Yoshitake Nakayama, Kayo Tsumura, Kazunari Takaya, Emiko Todaka i Chisato Mori. "Indoor Air Quality Analysis of Newly Built Houses". International Journal of Environmental Research and Public Health 16, nr 21 (28.10.2019): 4142. http://dx.doi.org/10.3390/ijerph16214142.

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Recently, people have become increasingly aware of potential health issues related to indoor environments. In this study, we measure the concentrations of various volatile organic compounds, carbonyl compounds, and semi-volatile organic compounds, as well as the ventilation rates, in 49 new houses with light-gauge steel structures one week after completion. The proper indoor air quality of new residential environments can be ensured by characterizing people’s exposure to certain chemicals and assessing future risks. Our results show that the concentrations of the measured compounds were lower than the guideline values set by the Ministry of Health, Labour and Welfare of Japan, and would continue to decrease. However, we observed that unregulated compounds, assumed to be substitutes for regulated solvents, contributed substantially to the total volatile organic compounds. To reduce indoor chemical exposure risks, the concentrations of these unregulated compounds should also be minimized. In addition, their sources need to be identified, and manufacture and use must be monitored. We believe it is important to select low-emission building materials for reducing residents’ exposure to indoor chemicals.

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Apriyanto, Donni Kis, i Mitrayana Mitrayana. "SERAPAN SENYAWA ORGANIK VOLATIL SEBAGAI BIOMARKER PENYAKIT KANKER PARU: SUATU MINI REVIEW". Biomedika 12, nr 2 (30.08.2020): 58–64. http://dx.doi.org/10.23917/biomedika.v12i2.10114.

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ABSTRAKUlasan ini merupakan hasil studi literatur yang memberikan tinjauan umum serapan senyawa-senyawa organik volatil yang dianggap sebagai biomarker kanker paru. Senyawa-senyawa ini dapat menyerap pada panjang gelombang tertentu. Senyawa-senyawa organik volatil yang teridentifikasi didaftar dan dijabarkan panjang gelombang yang dapat mereka serap. Studi literatur ini menyajikan kelompok senyawa-senyawa organik volatil dapat menyerap pada rentang panjang gelombang inframerah. Hasil ulasan ini mungkin dapat bermanfaat untuk pengembangan skrinning kanker paru dengan menggunakan alat spektroskopi fotoakustik yang menggunakan sumber laser pada rentang panjang gelombang inframerah atau ultraviolet dengan memanfaatkan serapan panjang gelombang oleh senyawa-senyawa tertentu.Keyword: Biomarker Kanker Paru,Senyawa Organik Volatil, Spektroskopi ABSTRACTThis review is the result of a literature study that provides a general collection of volatile organic compounds (VOC) which are considered as markers for lung cancer. These compounds can absorb certain long waves. The volatile organic compounds identified are listed and described in wavelengths that they can absorb. Literature studies that produce volatile organic compounds in the analysis wavelength range. The results of this review may be useful for the development of lung cancer screening by photoacoustic spectroscopic devices that use laser sources in the range of infrared or ultraviolet wavelengths by utilizing wavelength absorb by certain compounds.Keyword: Lung Cancer Biomarker, Volatile Organic Compounds, Spectroscopy

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20

Duan, Shengnan, Xiaoyan Tang, Wusun Li i Xinyuan Huang. "Analysis of the Differences in Volatile Organic Compounds in Different Muscles of Pork by GC-IMS". Molecules 28, nr 4 (11.02.2023): 1726. http://dx.doi.org/10.3390/molecules28041726.

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As the main consumed meat of Chinese residents, pork has a unique flavor, but the internal volatile organic compounds that cause the flavor differences between pork muscles are not clear at present. In this study, four muscles of Duroc × (Landrace × Yorkshire) pigs (loin, ham, shoulder and belly) were used as experimental subjects. Through the analysis of volatile organic compounds in four muscles of pork, the internal volatile organic compounds of different muscles of pork were discussed. Gas chromatography-ion mobility spectrometry was employed to analyze the four muscles, and volatile organic compounds in these muscles were analyzed and identified. A total of 65 volatile organic compound peaks were obtained by gas chromatography-ion mobility spectrometry. From the qualitative database, a total of 49 volatile organic compounds were identified, including aldehydes, alcohols and ketones. With the variable importance for the projection greater than 1 and significance level less than 0.05 as the criterion, the organic compounds with significant differences were screened by partial least squares-discriminant analysis and significance difference analysis. It was determined that 2-pentylfuran, 2-butanone (M), pentanal (M), butanal (D), (E)-2-hexenal, (E)-2-heptenal (D), 1,2-propanediol and 2-methylpropanal were the differential organic compounds that distinguish the four pork muscles.

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WONGLEE, S., H. FUKUDA, J. HASEGAWA i Y. OGURI. "CHEMICAL SPECIATION OF CHLORINE PRESENT IN PARTICULATE COMBUSTION PRODUCTS OF ORGANIC CHLORINE COMPOUNDS BY EMPLOYING HIGH-RESOLUTION PIXE ANALYSIS". International Journal of PIXE 21, nr 01n02 (styczeń 2011): 55–62. http://dx.doi.org/10.1142/s0129083511002161.

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The chemical speciation of chlorine ( Cl ) in particulate matter samples produced by the laboratory burning of organic Cl compounds was tested by employing the high-resolution measurement of K β X-rays based on a wavelength-dispersive proton-induced X-ray emission (WD-PIXE) technique. Targets for proton irradiation were prepared by depositing particulate burning products on aluminum foils placed on a simple barrel burner. Standard inorganic ( NaCl , MgCl 2, CaCl 2, NH 4 Cl , and AlCl 3) and organic (polyvinyl chloride and polyvinylidene chloride) Cl compounds were prepared for spectral comparison. We found that the Cl - K β1 peak energies for these organic compounds are higher by approximately 1 eV than those for inorganic compounds. For burning products of these organic compounds, the peak energies were found to be located between those for organic and inorganic compounds. This result indicates that the organic Cl compounds were decomposed to smaller molecules during the burning process but these fragments still existed in the organic form.

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Farzaliyev, V. M., i M. N. Aliyeva. "Feature analysis of vapor-phase chromatography of high boiler organic compounds". Azerbaijan Oil Industry, nr 4 (15.04.2020): 40–47. http://dx.doi.org/10.37474/0365-8554/2020-4-40-47.

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The paper presents the physical-chemical features of the vapor-phase chromatography method for the analysis of polar high boiler organic compounds. The application conditions of vapor-phase chromatography for the research of petrochemical synthesis products are analyzed. The mechanism of chromatographic seperation of compounds in the vapor-liquid-solid phase system is reviewed. The physical-chemical parameters of application of vapor-phase chromatography are provided. It is shown that liquid crystals can be used for the efficiency increase of the analysis of high boiler organic compounds as hard carriers. Thus, isomer compounds in the flow of water steam may be seperated. The usage of water-formamide mixture as a gas carrier enables the analysis of high boiler amine-based organic compounds. Natural, modified zeolite-containing tuff, diatoms and zeolites can be used as adsorbents and hard carriers in the separation of high boiler products of petrochemical synthesis.

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Mecca, Marisabel, Rocco Racioppi, Vito Antonio Romano, Licia Viggiani, Richard Lorenz i Maurizio D’Auria. "Volatile Organic Compounds in Dactylorhiza Species". Compounds 2, nr 2 (12.04.2022): 121–30. http://dx.doi.org/10.3390/compounds2020009.

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HS-SPME-GC–MS analysis of the scent of Dactylorhiza viridis revealed the presence of verbenone (28.86%), caryophyllene (25.67%), β-terpineol (9.48%), and δ-cadinene (6.94%). In the scent of Dactylorhiza romana β-ocimene (18.69%), pentadecane (18.40%), α-farnesene (14.65%), and isopropyl 14-methylpentadecanoate (14.32%) were found. Dactylorhiza incarnata contained tetradecane (11.07%), pentadecane (28.40%), hexadecane (19.53%), heptadecane (17.33%), and α-cubenene (11.48%). Analysis of Dactylorhiza saccifera showed the presence of caryophyllene (17.38%), pentadecane (6.43%), hexadecane (6.13%), and heptadecane (5.08%). Finally, the aroma components found in Dactylorhiza sambucina were caryophyllene (12.90%), β-sesquiphellandrene (32.16%), 4,5-di-epi-aristolochene (10.18%).

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24

Rae, Ian D. "Elemental Micro-analysis of Organic Compounds: the Australian Experience". Historical Records of Australian Science 27, nr 2 (2016): 116. http://dx.doi.org/10.1071/hr16017.

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Combustion methods for elemental analysis developed in Europewere adopted by Australian chemists, some of whom undertook training in the Pregl laboratory in Graz, the centre of microanalytical expertise. Microanalytical services developed slowly at the Universities of Sydney and Melbourne. After World War 2 the University of Melbourne and Australia's Council for Scientific and Industrial Research combined to bring German experts to Australia. One of them, Dr K. W. Zimmermann, headed the Australian Microanalytical Service in Melbourne that met the needs of Australian chemists and some overseas customers for four decades. Zimmermann also trained a chemist from Singapore, Mrs Tong Hee Keong, who returned to establish a microanalytical service there. Smaller facilities continued at some Australian universities but most of these closed as the need for micro analyses waned. Simple analyses could be conducted with modern auto-analyzers, but the use of mass spectroscopy to determine accurate molecular masses could obviate the need for combustion analysis. Two university services remain, and a microanalytical service in New Zealand has served Australian customers in recent years.

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Dyshlyuk, Lyubov, Anastasia Dmitrieva, Svetlana Ivanova, Yuliya Golubtsova i Lev Ostroumov. "Panax ginseng callus, suspension, and root cultures: extraction and qualitative analysis". Foods and Raw Materials 8, nr 2 (30.09.2020): 369–76. http://dx.doi.org/10.21603/2308-4057-2020-2-369-376.

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Introduction. In recent years, scientists have been actively searching for medicinal plants containing biologically active substances with geroprotective properties to treat diseases of old age, in particular cancer, diabetes, cardiovascular diseases, and others. Ginseng (Panax ginseng L.) is a promising source of geroprotective compounds. We aimed to select optimal parameters for extracting organic compounds from ginseng callus, suspension, and root cultures and analyze their qualitative composition. Study objects and methods. We studied ginseng callus, suspension, and root cultures, as well as their extracts. Biologically active substances were extracted with 30 to 70% ethanol. Organic compounds were determined by thin-layer chromatography. The results for each plant were archived and analyzed for the presence of quercetin, mangiferin, luteolin, rutin, quercetin-2-D-glucoside, malvidin, as well as caffeic, cinnamic, ferulic, and sinapinic acids. Results and discussion. We developed a procedure for screening solvents and performed a fractional qualitative analysis of biologically active substances extracted from ginseng. As a result, we established the optimal parameters for extracting biologically active substances from the dried biomass of ginseng cultures. In all cases, temperature and the ratio of solvent to biomass were the same (50°C, 1:5). However, the extraction time and ethanol concentration differed, amounting to 60 min and 50% for callus cultures, 30 min and 60% for suspension cultures, and 60 min and 70% for root cultures. The qualitative analysis of organic compounds showed the presence of rutin (0.25), quercetin (0.75), and mangiferin (0.57), as well as caffeic and sinapinic acids in the extracts. Conclusion. Our set of experiments to isolate biologically active substances from ginseng callus, suspension, and root cultures resulted in selecting the optimal extraction parameters and analyzing the extracts for the presence of organic compounds.

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Lukovtsev, V. P., N. V. Lukovtseva i V. A. Semenova. "Electrochemical Test System for Analysis of Sulfur-Containing Organic Substances". Herald of the Bauman Moscow State Technical University. Series Natural Sciences, nr 82 (2019): 88–95. http://dx.doi.org/10.18698/1812-3368-2019-1-88-95.

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The paper discusses selection of a set of metals for an electrochemical test system used for the detection of sulfur-containing organic substances. Analytical studies of organic sulfur compounds are very important since these compounds are widely used in medicine, biology, oil refining industry, etc. Quantitative determination and identification of sulfur-containing substances is essential for solving environmental problems. The electrochemical test system for analysis of organic substances is a solution containing a set of cations of various metals that have the ability to form complex compounds with analytes. Thereby, a single electrode can be used to carry out electrochemical multisensory analysis because metal cations play the role of sensors. Thus, there is no need to use a set of several working (indicator) electrodes, the number of which determines the number of informative parameters. Since sets of metals for test systems may slightly differ from each other, we need to select an optimal set for a specific problem. According to the study results, a set of metals for sulfur-containing organic substances consists of zinc, gallium and copper. The test system composed of these metals gives reliable results of electroanalytical determination of organic compounds of this class. The expediency of using such a test system is confirmed by comparative estimation of the Euclidean distances between the vector representations of the analytes and sulfur-containing organic compounds presented in the previously created database. Software for experimental data processing, visualization, and comparative analysis of the vector representations and the database components is developed.

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Sun, Chuang, A. Khalid, H. M. Usman, A. Ahmad, M. K. Siddiqui i S. A. Fufa. "On Neighborhood Degree-Based Topological Analysis of Polyphenylene Network". Mathematical Problems in Engineering 2022 (21.02.2022): 1–14. http://dx.doi.org/10.1155/2022/1951226.

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Organic compounds such as polyphenylene are very important and useful for the synthesis of many new organic compounds due to their physio-chemical properties. To ascertain these properties, one can use QSPR/QSAR methods which necessitate the computation of topological indices. The topological indices based on two newly introduced abstract notions of ev-degree and ve-degree are in practice to model numerous chemical properties as well as physical properties of organic, inorganic, hybrid, and biological compounds. In this study, we computed a certain number of topological indices for the chemical graph of polyphenylene network which will help to model some of its physio-chemical properties.

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Oshima, Naohiro, Maiko Tahara, Shinobu Sakai i Yoshiaki Ikarashi. "Analysis of Volatile Organic Compounds Emitted from Bedding Products". BPB Reports 4, nr 6 (2021): 182–92. http://dx.doi.org/10.1248/bpbreports.4.6_182.

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Long, Jimiao, Lei Deng i Defu Che. "Analysis on organic compounds in water leachate from biomass". Renewable Energy 155 (sierpień 2020): 1070–78. http://dx.doi.org/10.1016/j.renene.2020.04.033.

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Polzin, Gregory M., Rachel E. Kosa-Maines, David L. Ashley i Clifford H. Watson. "Analysis of Volatile Organic Compounds in Mainstream Cigarette Smoke". Environmental Science & Technology 41, nr 4 (luty 2007): 1297–302. http://dx.doi.org/10.1021/es060609l.

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Lee, Joon-Woo, i In-Hyeong Yeo. "Integrated pulsed amperometry for the analysis of organic compounds". Microchemical Journal 70, nr 3 (grudzień 2001): 173–77. http://dx.doi.org/10.1016/s0026-265x(01)00127-8.

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Ghaoui, Labib. "Analysis of semivolatile organic compounds by headspace gas chromatography". Journal of Chromatography A 642, nr 1-2 (lipiec 1993): 389–94. http://dx.doi.org/10.1016/0021-9673(93)80103-f.

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Först, C., L. Stieglitz, W. Roth i S. Kuhnmünch. "Quantitative Analysis of Volatile Organic Compounds in Landfill Leachates". International Journal of Environmental Analytical Chemistry 37, nr 4 (grudzień 1989): 287–93. http://dx.doi.org/10.1080/03067318908026905.

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Lopes, Thomas J., James D. Fallon i Terry L. Maluk. "Compositing Water Samples for Analysis of Volatile Organic Compounds". Journal of Environmental Engineering 126, nr 8 (sierpień 2000): 769–73. http://dx.doi.org/10.1061/(asce)0733-9372(2000)126:8(769).

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Pyrzyńska, Krystyna. "Speciation analysis of some organic selenium compounds. A review". Analyst 121, nr 8 (1996): 77R—83R. http://dx.doi.org/10.1039/an996210077r.

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Coughlan, Rebecca, Kieran Kilcawley, Iwona Skibinska, Siobhán Moane i Tracey Larkin. "Analysis of volatile organic compounds in Irish rapeseed oils". Current Research in Food Science 6 (2023): 100417. http://dx.doi.org/10.1016/j.crfs.2022.100417.

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Holzapfel, W., i K. Budde. "Ultratrace analysis of volatile organic compounds in semiconductor industry". Fresenius' Journal of Analytical Chemistry 343, nr 9-10 (1992): 769–70. http://dx.doi.org/10.1007/bf00633563.

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Zhang, GuoJuan, XiaoXi Guo, ShuLing Wang, XueLan Wang, YanPing Zhou i Hui Xu. "New graphene fiber coating for volatile organic compounds analysis". Journal of Chromatography B 969 (październik 2014): 128–31. http://dx.doi.org/10.1016/j.jchromb.2014.08.016.

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Roeraade, J., i S. Blomberg. "New methodologies in trace analysis of volatile organic compounds". Journal of High Resolution Chromatography 12, nr 3 (marzec 1989): 138–41. http://dx.doi.org/10.1002/jhrc.1240120305.

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Bui, Quang Minh, Huynh Nhat Minh Nguyen, Van Nhan Le, Thanh Thao Nguyen, Ngoc Minh Truong, Ngoc Tung Nguyen, Quang Huong Le i Quang Trung Nguyen. "AIQS-DB: Revolutionizing the Simultaneous Analysis of Organic Compounds". Applied Sciences 13, nr 14 (10.07.2023): 8031. http://dx.doi.org/10.3390/app13148031.

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This paper reports a database, namely, the Automated Identification and Quantification Database System (AIQS-DB), which consists of three components, including retention times, mass data, and calibration curves, without the requirement to analyze standard substances. The AIQS-DB that are pre-registered in the database are used as the replacement for the process of measuring chemical standards. Both the target and unknown substances in the real samples were determined by the same conditions of GC-MS as those used for the initial database register in the AIQS-DB system. The article provides a comprehensive overview of the wide-ranging applications of AIQS-DB in various fields and highlights its usefulness as a tool for the simultaneous analysis of organic compounds in different matrixes such as water, soil, sediment and air, etc. It could be considered as the basis in further applications of the AIQS-DB method in determining organic compounds in other fields, specifically biology, food, agriculture, medicine, etc., allowing assessment and reflection on the quality and status of the studied products quickly and cost-effectively.

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Gong, Gui Zhen, Ji Ming Chu, Xian Yong Wei i Zhi Min Zong. "Analysis of Extraction of Coal Oxidation Residue in NaOCl". Advanced Materials Research 724-725 (sierpień 2013): 1103–6. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.1103.

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Sequential extraction of four coal oxidation residues (COR) from aqueous NaOCl solution with petroleum ether (PE), carbon disulfide (CS2), acetone and methanol were investigated. The results suggest that methanol is an effective extraction solvent, giving the highest extraction yields for four COR. The extraction fractions were analyzed by GC/MS. It is found that no compounds, except for F1 of HL and XL , F2 of four COR, were detected. In total, 89 organic compounds were detected in F1 of HL and XL, 23 organic compounds in F2 from four COR. Most of which were arenes (As), normal alkanes (NAs) and oxygen-containing compounds (OCCs).

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Albert, M., C. Demesmay i J. L. Rocca. "Analysis of organic and non-organic arsenious or selenious compounds by capillary electrophoresis". Fresenius' Journal of Analytical Chemistry 351, nr 4-5 (1995): 426–32. http://dx.doi.org/10.1007/bf00322913.

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Biemann, K. "Analytical techniques for trace organic compounds-III: Mass spectrometry in trace organic analysis". Pure and Applied Chemistry 63, nr 11 (1.01.1991): 1637–46. http://dx.doi.org/10.1351/pac199163111637.

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Zhou, Shiqi, Duo Feng, Yaxi Zhou, Hao Duan, Yue He, Yongjun Jiang i Wenjie Yan. "Characteristic Volatile Organic Compound Analysis of Different Cistanches Based on HS-GC-IMS". Molecules 27, nr 20 (11.10.2022): 6789. http://dx.doi.org/10.3390/molecules27206789.

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Cistanche is a medicinal and food homologous substance with a long history of consumption and medicinal use in China. In order to further understand the volatile organic compound differences between different cistanches, this study selected oil cistanche, blood cistanche and cistanche tubulosa in Xinjiang for HS-GC-IMS volatile organic compounds, and established the characteristic fingerprints of different cistanches for organic content and characteristic organic compound analysis. PCA and cluster analysis were used to study the similarity between different cistanches. After qualitative analysis, a total of 32 volatile organic compounds were identified, covering aldehydes (17), ketones (5), furans (1), alcohols (5), lactones (1) and esters (3), and the volatile organic compounds between samples a, b and c could be significantly distinguished, affecting the flavor of cistanche itself. It provides a basic theoretical basis for the study of cistanche flavor.

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Urra, J., P. Poirrier, R. Chamy, J. Segovia i Y. Lesty. "Analysis of the methodology to determine anaerobic toxicity: evaluation of main compounds present in wastewater treatment plants (WWTPs)". Water Science and Technology 57, nr 6 (1.03.2008): 857–62. http://dx.doi.org/10.2166/wst.2008.105.

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The influence of the concentration of biomass on the level of inhibition and anaerobic degradation kinetics in batch systems was studied with toxic compounds that can generate destabilization in the operation of sludge anaerobic digesters. The compounds were grouped in four families; long chain fatty acids, polycyclic aromatic hydrocarbons, linear alkylbenzene sulphonates and organic acids. For the organic acids, there is no effect due to the biomass concentration variation, therefore it is a competitive inhibition; but that doesn't happen with the remaining compounds, where there is a dependence on the complexity of their structure, becoming a non-competitive inhibition. In addition, it was observed that the degradation kinetics is affected, whether diminishing the methane production (polycyclic aromatic hydrocarbons, linear alkylbenzene sulphonates, organics acids) or increasing the initial latency time (long chain fatty acids) without this becoming an obstacle to obtain the maximum methane productions for the latter ones.

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Dundek, Peter, Ladislav Holík, Tomáš Rohlík, Ladislav Hromádko, Valerie Vranová, Klement Rejšek i Pavel Formánek. "Methods of plant root exudates analysis: a review". Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 59, nr 3 (2011): 241–46. http://dx.doi.org/10.11118/actaun201159030241.

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The aim of this review is to summarise current knowledge on methods being used to determine individual compounds and properties of water-soluble plant root exudates. These compounds include amino acids, organic acids and simple sugars, as well as polysaccharides, proteins and organic substances. Qualitative composition of water-soluble root exudates and exudation rate are commonly measured with the aim of consequent synthetic preparation of plant root exudates to be supplied to soil to create artificial rhizosphere for different experimental purposes. Root exudates collection usually requires consequent filtration or centrifugation to remove solids, root detritus and microbial cell debris, and consequent concentration using an evaporator, lyophilizator or ultrafiltration. Methods used for analysis of total groups of compounds (total proteins and total carbohydrates) and total organic carbon are simple. On the other hand, HPLC or GS/MS are commonly used to analyse individual low molecular weight organic molecules (sugars, organic acids and amino acids) with separation using different columns. Other properties such as pH, conductivity or activity of different enzymes as well as gel electrophoresis of proteins are sometimes assessed. All of these methods are discussed in this work.

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Khoddami, Ali, Meredith Wilkes i Thomas Roberts. "Techniques for Analysis of Plant Phenolic Compounds". Molecules 18, nr 2 (19.02.2013): 2328–75. http://dx.doi.org/10.3390/molecules18022328.

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Naraoka, Hashiguchi, Sato i Hamase. "New Applications of High-Resolution Analytical Methods to Study Trace Organic Compounds in Extraterrestrial Materials". Life 9, nr 3 (26.07.2019): 62. http://dx.doi.org/10.3390/life9030062.

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Organic compounds are present as complex mixtures in extraterrestrial materials including meteorites, which may have played important roles in the origin of life on the primitive Earth. However, the distribution and formation mechanisms of meteoritic organic compounds are not well understood, because conventional analytical methods have limited resolution and sensitivity to resolve their molecular complexity. In this study, advanced instrumental development and analyses are proposed in order to study the trace organic compounds of extraterrestrial materials: (1) a clean room environment to avoid organic contamination during analysis; (2) high-mass-resolution analysis (up to ~150,000 m/m) coupled with high-performance liquid chromatography (HPLC) in order to determine the elemental composition using exact mass for inferring the chemical structure; (3) superior chromatographic separation using a two-dimensional system in order to determine the structural and optical isomers of amino acids; and (4) in situ organic compound analysis and molecular imaging of the sample surface. This approach revealed a higher complexity of organic compounds with a heterogeneous distribution in meteorites. These new methods can be applied to study the chemical evolution of meteoritic organic compounds as well as the molecular occurrence in very-low-mass extraterrestrial materials such as asteroid-returned samples.

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Wang, Xiaohua, i Xin He. "Cluster Analysis of Soluble Organic Fractions in Two Low-Rank Coals". Applied Sciences 12, nr 22 (14.11.2022): 11562. http://dx.doi.org/10.3390/app122211562.

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A brief overview of the composition and structure of soluble organic compounds as well as organic macromolecules in coal is sufficient to support the development of the coal chemical industry and realize the clean, effective, and high value-added exploitation of coal. In this study, 14 groups of extracts were analyzed by a gas chromatograph-mass spectrometer; seven stages of solvent-graded extraction were carried out on two typical low-rank coals, and the extracted substance spectrum data were processed by principal component analysis and cluster analysis to investigate the molecular makeup and structure of the soluble organic compounds in the two coals. CS2 had a better extraction effect on aromatic hydrocarbons, and methanol was better for the enrichment and separation of oxygenated compounds. Hexane and petroleum ethers have a good extraction effect for aliphatic hydrocarbons; benzene has a good effect for the extraction of nitrogenous compounds; acetone has a greater extraction rate for alcohols; tetrahydrofuran has a more obvious extraction effect for ketones; the mixed solvent of tetrahydrofuran and methanol has a greater extraction rate for esters.

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Mounia Zine, Mounia Zine, Amel Bouakkadia Amel Bouakkadia i Leila Lourici and Djelloul Messadi Leila Lourici and Djelloul Messadi. "Modeling and Prediction of Gas Chromatography Relative Retention Times of Volatile Organic Compounds". Journal of the chemical society of pakistan 42, nr 3 (2020): 447. http://dx.doi.org/10.52568/000645.

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The theme of this paper is to foresee relative retention time of 122 volatile organic compounds. QSRR analysis was accomplished on a serial of 122 VOCs. Multiple Linear Regression (MLR) and support vector machine (SVM) methods were used to build linear and nonlinear (QSRR) models, respectively, which correlate the (RTT) values of these chemical substance to their structural descriptors. At first, the data set was separated using Kennard and Stone algorithm into a training set (92 chemicals) and a test set (30 chemicals) for statistical external validation. The five-dimensional models were developed using as independent variables the theoretical descriptors derived from the DRAGON software during the application of the procedure GA (genetic algorithm) - VSS (Variable Subset Selection). The robustness and the predictive performance of the MLR model have been demonstrated by inside and outer statistical validation. Non-linear technique leads to the best QSRR model with good internal and external predictive abilities. It is based on support vector machines using the RBF function for the optimal parameters values. The values of and were 17, 0.2, 0.2, respectively.

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