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1. Capillary electrophoresis of boron cluster compounds in aqueous and nonaqueous solvents

Author:
Valeri, Anna Lucia; Kremser, Leopold; Raggi, Maria Augusta; Grüner, Bohumir; Vespalec, Radim; Kenndler, Ernst
Source:
Electrophoresis 2008 v.29 no.8 pp. 1658-1666
ISSN:
0173-0835
Subject:
acetates; acetic acid; anions; boron; capillary electrophoresis; cobalt; hydrodynamics; ionic strength; methanol; pH; perchloric acid; solvents; viscosity
Abstract:
... The electrophoretic properties of boron cluster compounds were determined in water, methanol and ACN as solvents of the BGE and discussed based on the principles of ion migration. Two types of boron cluster compounds were investigated. One type consisted of derivatives of the nido-7,8-dicarbaundecaborate cluster, the other types are derivatized cobalt bis(dicarbollide) ions (COSANs) whose central ...
DOI:
10.1002/elps.200700815

2. Chemical changes in terpenes of sugi (Cryptomeria japonica) wood during steam drying in kiln at high temperature

Author:
Yoh-ichi Matsushita; Kazuhiro Sugamoto; Kenji Miyakubo; Chiaki Kurogi; Takanao Matsui; Hisato Oda; Hideto Fujimoto
Source:
Journal of wood science 2008 v.54 no.6 pp. 476-482
ISSN:
1435-0211
Subject:
Cryptomeria japonica; acetates; acetic acid; drying; gas chromatography; kilns; mass spectrometry; steam; temperature; terpenoids; wood; wood drying; wood extractives
Abstract:
... Sawdusts of sugi (Cryptomeria japonica) wood prepared before and after steam drying at 120°C in a kiln were extracted with n-hexane and ethyl acetate to give n-hexane extracts and ethyl acetate extracts. From gas chromatography-mass spectrometry analysis of the ethyl acetate extracts from woods before and after steam drying, the components of 4-epi-cubebol, cubebol, and 2,7(14),10-bis-abolatrien-1 ...
DOI:
10.1007/s10086-008-0980-6

3. Comparison of high performance TLC and HPLC for separation and quantification of chlorogenic acid in green coffee bean extracts

Author:
Urakova, Irina N.; Pozharitskaya, Olga N.; Shikov, Alexander N.; Kosman, Vera M.; Makarov, Valery G.
Source:
Journal of separation science 2008 v.31 no.2 pp. 237-241
ISSN:
1615-9306
Subject:
acetates; acetic acid; chlorogenic acid; coffee beans; densitometry; formic acid; high performance liquid chromatography; silica gel
Abstract:
... Two chromatographic methods, high-performance TLC (HPTLC) and HPLC, were developed and used for separation and quantitative determination of chlorogenic acid in green coffee bean extracts. For HPTLC silica gel Kieselgel 60 F 254 plates with ethyl acetate/dichlormethane/formic acid/acetic acid/water (100:25:10:10:11, v/v/v/v/v) as mobile phase were used. Densitometric determination of chlorogenic a ...
DOI:
10.1002/jssc.200700472
PubMed:
18183554

4. Critical evaluation of buffering solutions for pKa determination by capillary electrophoresis

Author:
Fuguet, Elisabet; Reta, Mario; Gibert, Carme; Rosés, Martí; Bosch, Elisabeth; Ràfols, Clara
Source:
Electrophoresis 2008 v.29 no.13 pp. 2841-2851
ISSN:
0173-0835
Subject:
acetates; acetic acid; amines; ammonia; boric acid; buffers; capillary electrophoresis; pH; phenols; pyridines
Abstract:
... The performance of the most common and also some other less common CE buffers has been tested for the pKa determination of several types of compounds (pyridine, amines, and phenols). The selected buffers cover a pH ranging from 3.7 to 11.8. Whereas some buffers, like acetic acid/acetate, BisTrisH⁺/BisTris, TrisH⁺/Tris, CHES/CHES⁻, and CAPS/CAPS⁻ can be used with all type of analytes, others like a ...
DOI:
10.1002/elps.200700869

5. Fermentation characteristics of Fusarium oxysporum grown on acetate

Author:
Panagiotou, Gianni; Pachidou, Fotini; Petroutsos, Dimitris; Olsson, Lisbeth; Christakopoulos, Paul
Source:
Bioresource technology 2008 v.99 no.15 pp. 7397-7401
ISSN:
0960-8524
Subject:
Fusarium oxysporum; NAD (coenzyme); acetates; acetic acid; fermentation; glucose; glyoxylate cycle; isocitrate lyase; minimum inhibitory concentration
Abstract:
... In this study, the growth characteristics of Fusarium oxysporum were evaluated in minimal medium using acetate or different mixtures of acetate and glucose as carbon source. The minimum inhibitory concentration (MIC) of acetic acid that F. oxysporum cells could tolerate was 0.8%w/v while glucose was consumed preferentially to acetate. The activity of isocitrate lyase was high when cells were grown ...
DOI:
10.1016/j.biortech.2008.01.017
PubMed:
18304808

6. Interannual and seasonal changes in the soil exchange rates of monoterpenes and other VOCs in a Mediterranean shrubland

Author:
Asensio, D.; Peñuelas, J.; Prieto, P.; Estiarte, M.; Filella, I.; Llusià, J.
Source:
European journal of soil science 2008 v.59 no.5 pp. 878-891
ISSN:
1351-0754
Subject:
acetaldehyde; acetates; acetic acid; acetone; drought; emissions; foliar uptake; inventories; methanol; monoterpenoids; phenology; roots; seasonal variation; shrublands; soil ecology; soil temperature; soil water; volatile organic compounds
Abstract:
... Information about soil VOC inventories and exchange rates in different soils is very scarce. Seasonality of soil VOC exchange rates is also largely unknown, despite the increasing interest in some soil volatile compounds, such as monoterpenes, because of their important role in soil ecology. We aimed to explore and quantify soil VOC exchange rates in a Mediterranean shrubland and their seasonality ...
DOI:
10.1111/j.1365-2389.2008.01057.x

7. Kinetics of syntrophic acetogenesis in a saline medium

Author:
Huiliñir, César; Roa, Erick; Vargas, Daniela; Roeckel, Marlene; Aspé, Estrella
Source:
Journal of chemical technology and biotechnology 2008 v.83 no.10 pp. 1433-1440
ISSN:
0268-2575
Subject:
acetates; acetic acid; equations; pH; sodium chloride; volatile fatty acids
Abstract:
... BACKGROUND: The anaerobic degradation kinetics of volatile fatty acids (VFA) in a saline (24 g NaCl dm⁻³) and mesophilic (37 °C) medium was studied under batch test conditions. The acetate production kinetics without inhibition by propionic, butyric and valeric acids was determined. The inhibition of acetate production during syntrophic acetogenesis by VFA and pH was studied. The acetogenesis with ...
DOI:
10.1002/jctb.1967

8. Monitoring of fosinopril sodium impurities by liquid chromatography-mass spectrometry including the neural networks in method evaluation

Author:
Jančić, B.; Medenica, M.; Ivanović, D.; Janković, S.; Malenović, A.
Source:
Journal of chromatography 2008 v.1189 no.1-2 pp. 366-373
ISSN:
0021-9673
Subject:
acetates; acetic acid; algorithms; ammonium acetate; chemical structure; drugs; experimental design; liquid chromatography; mass spectrometry; methanol; monitoring; neural networks; neurons; particle size; screening; sodium; system optimization; topology
Abstract:
... In this paper, the mass spectrometry (MS) detection has been applied for screening of fosinopril sodium impurities which arise during forced stress study. Before MS analysis, liquid chromatographic method with suitable mobile phase composition was developed. The separation was done on SunFire 100mmx4.6mm 3.5μm particle size column. The mobile phases which consisted of methanol-ammonium acetate buf ...
DOI:
10.1016/j.chroma.2007.11.076

9. Separation of acylglycerols, FAME and FFA in biodiesel by size exclusion chromatography

Author:
Kittirattanapiboon, Kanisa; Krisnangkura, Kanit
Source:
European journal of lipid science and technology 2008 v.110 no.5 pp. 422-427
ISSN:
1438-7697
Subject:
acetone; acetic acid; acetates; detection limit; vegetable oil; diacylglycerols; free fatty acids; methylene chloride; monoacylglycerols; triacylglycerols; solutes; gel chromatography; animal fats and oils; biodiesel; toluene; molecular weight
Abstract:
... Size-exclusion chromatography separates solutes according to their molecular sizes. Free fatty acids (FFA), fatty acid methyl esters (FAME) and monoacylglycerols (MG) of vegetable oils or animal fats have very close molecular sizes and they cannot be baseline-separated on a single Phenogel column (100 Å, 300 mm x 7.8 mm ID, 5 μm) by using tetrahydrofuran (THF) as the mobile phase. When toluene is ...
DOI:
10.1002/ejlt.200700164

10. The effect of replacing brewers' grains with barley tea grounds in total mixed ration silage on feed intake, digestibility and ruminal fermentation in wethers

Author:
XU, Chuncheng; CAI, Yimin; FUKASAWA, Michiru; MATSUYAMA, Hiroki; MORIYA, Naoko
Source:
Animal science journal = 2008 v.79 no.5 pp. 575-581
ISSN:
1344-3941
Subject:
acetates; acetic acid; alfalfa hay; ammonium nitrogen; barley; beet pulp; brewers grains; butyrates; corn; crude protein; diet; digestibility; digestible energy; fatty acid composition; feed intake; lactic acid; neutral detergent fiber; nitrogen; nitrogen balance; oats; pH; propionic acid; rumen fermentation; silage; soybean meal; tea; total mixed rations; volatile fatty acids; wethers
Abstract:
... Four wethers were used in a 4 x 4 Latin square to study the feed intake, apparent digestibility, nitrogen balance and ruminal fermentation characteristics when fed total mixed ration (TMR) silages which included wet barley tea grounds (WBTG). The TMR silages were prepared using compound feed including wet brewers' grains (WBG), corn, oat hay, alfalfa hay, dried beet pulp, salt and vitamin-mineral ...
DOI:
10.1111/j.1740-0929.2008.00566.x

11. Virgin grape seed oil: Is it really a nutritional highlight

Author:
Matthäus, Bertrand
Source:
European journal of lipid science and technology 2008 v.110 no.7 pp. 645-650
ISSN:
1438-7697
Subject:
acetates; acetic acid; ethanol; grape juice; grapeseed oil; linoleic acid; lipid content; nutrition; odors; oilseed cakes; phenolic compounds; pressing; raisins; raw materials; seeds; smell; taste; tocopherols; tocotrienols; water content
Abstract:
... In comparison to refined grape seed oil which is neutral in taste and smell, the virgin oil is characterized by a pleasant vinous and fruity aroma, which also reminds of raisins if high-quality raw material is used for the production. Difficulties arise from the susceptibility of the raw material to microbial and enzymatic deterioration as a result of the high moisture content after pressing the j ...
DOI:
10.1002/ejlt.200700276

12. Volatile and Color Composition of Young and Model-Aged Shiraz Wines As Affected by Diammonium Phosphate Supplementation Before Alcoholic Fermentation

Author:
Ugliano, Maurizio; Siebert, Tracey; Mercurio, Meagan; Capone, Dimitra; Henschke, Paul A.
Source:
Journal of agricultural and food chemistry 2008 v.56 no.19 pp. 9175-9182
ISSN:
0021-8561
Subject:
fatty acids; acetates; food composition; odors; sulfur; sugars; chemical concentration; model food systems; volatile compounds; flavor; ethanol; red wines; chemical composition; acetic acid; diammonium phosphate; monoterpenoids; alcoholic fermentation; wine aging; color; grape must
Abstract:
... A Shiraz must with low yeast assimilable nitrogen (YAN) was supplemented with two concentrations of diammonium phosphate (DAP) and then fermented with maceration on grape skins. The nonvolatile, volatile, and color composition of the final wines were investigated. Ethanol and residual sugars were not affected by DAP supplementation, while glycerol, SO2, and residual YAN increased and acetic acid d ...
DOI:
10.1021/jf801273k
PubMed:
18788746