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Journal articles on the topic 'Pentanedione'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Pejin, Jelena, Olgica Grujic, Sinisa Markov, Suncica-Tanackov Kocic, Dragoljub Cvetkovic, and Ilija Tanackov. "Fermentation temperature and wort composition influence on diacetyl and 2, 3-pentanedione contents in beer." Zbornik Matice srpske za prirodne nauke, no. 108 (2005): 229–38. http://dx.doi.org/10.2298/zmspn0508229p.

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Diacetyl and 2,3-pentanedione are important constituents of beer sensory properties. A new GC/MS method for diacetyl and 2,3-pentanedione content determination was developed. This method was applied for the determination of diacetyl and 2,3-pentanedione contents during beer fermentation (primary fermentation and maturation). Primary fermentations were carried out at different temperatures (8?C and 14?C). Primary fermentation temperature had a great influence on diacetyl and 2,3-pentanedione formation and reduction. Formation and reduction rates increased with the primary fermentation temperatu

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2

Ballantyne, B. "2,4-pentanedione." Journal of Applied Toxicology 21, no. 2 (2001): 165–71. http://dx.doi.org/10.1002/jat.739.

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3

Krishnankutty, K., P. Sayudevi, and Basheer Ummathur. "Metal complexes of Schiff’s bases derived from 3-(arylazo)-2,4- -pentanediones with 2-aminophenol and 2-aminothiophenol." Journal of the Serbian Chemical Society 72, no. 11 (2007): 1075–84. http://dx.doi.org/10.2298/jsc0711075k.

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Phenylazo- and thiazolylazo-2,4-pentanediones on reaction with 2-aminophenol and 2-aminothiophenol yielded a new series of polydentate Schiff?s base ligands. The structure and tautomeric nature of these compounds and their metal complexes were established on the basis of their IR, 1H-NMR and mass spectral data. The spectral and analytical data revealed the condensation of both carbonyl groups of 3-(2-thiazolylazo)- 2,4-pentanedione with 2-aminophenol to form an N2O2 tetradentate ligand. Details on the formation of its [ML] complexes with Ni(II), Cu(II) and Zn(II) and the nature of their bondin

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4

Pejin, Jelena, Olgica Grujic, Nikola Marjanovic, Djura Vujic, and Suncica Kocic-Tanackov. "Determina tion of diacetyl and 2,3-pentanedione in beer by gc/ms using solid-phase extraction columns." Acta Periodica Technologica, no. 33 (2002): 45–54. http://dx.doi.org/10.2298/apt0233045p.

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A new GC/MS method for the determination of diacetyl and 2,3-pentanedione was investigated. Diacetyl and 2,3-pentanedione were derivatized with 1,2-diaminobenzene to form 2,3-dimetylquinoxaline and 2-ethyl-3-methylquinoxaline. respectively. The amounts of formed 2.3-dimetylqu:inoxaline and 2-ethyl-3,.methylquinoxaline were proportional to the concentrations of diacetyl and 2,3-penianedione present in the sample. 2,3-Dimetylquinoxaline and 2-ethyl-3-methylquinoxaline were extracted by solid-phase extraction (SPE) columns and determined by gas chromatography using a mass selective detector. This

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5

Robinson, Gill. "Pentanedione on the brain." Food and Chemical Toxicology 25, no. 4 (1987): 341–42. http://dx.doi.org/10.1016/0278-6915(87)90138-4.

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6

Sykora, Richard E., Katrina Kalachnikova, and Greg T. Spyridis. "3-Triphenylmethyl-2,4-pentanedione." Acta Crystallographica Section E Structure Reports Online 63, no. 10 (2007): o4075. http://dx.doi.org/10.1107/s1600536807043619.

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7

Pengelly, Ian, and Veronica M. Brown. "A New Method for Workplace Monitoring of Airborne Diacetyl and 2,3-Pentanedione Using Thermal Desorption Tubes and Gas Chromatography-Mass Spectrometry." Annals of Work Exposures and Health 63, no. 4 (2019): 407–14. http://dx.doi.org/10.1093/annweh/wxz014.

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Abstract Diacetyl is a potentially harmful chemical that is used as an artificial flavouring in the food industry and may also be generated during processing of some natural products including coffee. In Europe, an 8-h time weighted average occupational exposure limit (TWA-OEL) of 20 ppb has been adopted for diacetyl, together with a short-term exposure limit (STEL) of 100 ppb. A sensitive new measurement method for diacetyl, and the related compound 2,3-pentanedione has been developed and evaluated. The new method uses Tenax TA sorbent tubes as the sampling media with analysis by thermal deso

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8

Hunter, Duncan H., Chantelle McRoberts, and Jagadese J. Vittal. "Article." Canadian Journal of Chemistry 76, no. 5 (1998): 522–24. http://dx.doi.org/10.1139/v98-066.

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Attempts to prepare 2,4-bisthiosemicarbamoylpentanediones 1 via literature precedent from 2,4-pentanedione and three different thiosemicarbazides resulted instead in the formation of cyclic pyrazolines 5. The preparation was attempted with thiosemicarbazide, 4-methylthiosemicarbazide, and 4-ethylthiosemicarbazide, respectively. A single-crystal X-ray structure study of the product from 4-methylthiosemicarbazide confirmed the pyrazoline structure. This observation serves to correct earlier misassignments of structure.Key words: pentanedione, bisthiosemicarbazone, pyrazoline, ethylenediamine.

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9

Mitkidou, Sophia, Julia Stephanidou-Stephanatou, and Helen Stephopoulou. "Reaction of 3-benzylidene-2,4-pentanedione and 3-methoxymethylene-2,4-pentanedione with aroylhydrazines." Journal of Heterocyclic Chemistry 30, no. 2 (1993): 441–44. http://dx.doi.org/10.1002/jhet.5570300227.

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10

Prlainovic, Nevena, Dejan Bezbradica, Zorica Knezevic-Jugovic, Dusan Velickovic, and Dusan Mijin. "Enzymatic synthesis of vitamin B6 precursor." Journal of the Serbian Chemical Society 78, no. 10 (2013): 1491–501. http://dx.doi.org/10.2298/jsc130322050p.

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3-Cyano-4-ethoxymethyl-6-methyl-2-pyridone is an important precursor in the synthesis of vitamin B6, obtained in the addition reaction between 2-cyanoacetamide and 1-ethoxy-2,4-pentanedione catalyzed by lipase from Candida rugosa (triacylglycerol ester hydrolases, EC 3.1.1.3). This work shows new experimental data and mathematical modeling of lipase catalyzed synthesis of 3-cyano-4-ethoxymethyl-6-methyl-2-pyridone, starting from 1-ethoxy-2,4-pentanedione and 2-cyanoacetamide. Kinetic measurements were done at 50 oC with enzyme concentration of 1.2 % w/v. Experimental results were fitted with t

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11

Gagula, Goran, Dragica Đurđević-Milošević, Thembekile Ncube, and Damir Magdić. "The effect of pasteurisation and storage on aroma compounds in lager." Journal of the Institute of Brewing 130, no. 2 (2024): 83–92. http://dx.doi.org/10.58430/jib.v130i2.52.

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Why was the work done: To investigate the impact of pasteurisation and storage in bottle on aroma compounds in pale lager beer. How was the work done: Pale lager beer was produced at an industrial scale with 100% pilsner malt and a bottom fermenting yeast. Samples were taken of unpasteurised beer from bright beer tank, after flash pasteurisation and six months after packaging in amber glass bottles. What are the main findings: Post pasteurisation, a marked increase was found in the concentration of 2,3-pentanedione (50%) and diacetyl (33%), presumably reflecting the decomposition by heat of pr

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12

Aakeröy, Christer B., Izhar Hussain, Safiyyah Forbes, and John Desper. "Versatile Ligands for the Construction of Layered Metal-Containing Networks." Australian Journal of Chemistry 62, no. 8 (2009): 899. http://dx.doi.org/10.1071/ch08440.

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The synthetic opportunities furnished by organic synthesis and the inherent structure-directing possibilities of coordination complexes have been combined in the assembly of a series of layered metal-containing hybrid materials. The supramolecular assembly relies on self-complementary non-covalent interactions, and in five of the six structures presented herein, N–H···O=C hydrogen bonds between acetamide moieties on neighbouring ligands provide the primary structure-direction tool as intended. The distances between metal ions are controlled by ligand···ligand hydrogen bonds and reside within a

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13

LeBouf, Ryan F., Brie Hawley, and Kristin J. Cummings. "Potential Hazards Not Communicated in Safety Data Sheets of Flavoring Formulations, Including Diacetyl and 2,3-Pentanedione." Annals of Work Exposures and Health 63, no. 1 (2018): 124–30. http://dx.doi.org/10.1093/annweh/wxy093.

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Abstract Objectives Workers using flavoring formulations containing diacetyl and 2,3-pentanedione may be at risk of inhalational exposure, as these volatile hazardous chemicals are emitted from the bulk material, especially at elevated temperatures. However, flavoring formulations that contain diacetyl and 2,3-pentanedione might not list these ingredients because they are generally recognized as safe to ingest, may be part of a proprietary mixture deemed a trade secret, or may not be required to be listed if they are present at &lt;1% composition. The objective of this study was to investi

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14

Mani Naidu, S., M. Krishnaiah, K. Sivakumar, and R. P. Sharma. "2,4-Pentanedione Bis(2,4-dinitrophenylhydrazone)." Acta Crystallographica Section C Crystal Structure Communications 52, no. 4 (1996): 1054–56. http://dx.doi.org/10.1107/s0108270195013874.

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15

Raviprasad, A., and K. Venkateswara Rao. "Vapour pressure of 2,4-pentanedione." Journal of Chemical Thermodynamics 17, no. 2 (1985): 117–21. http://dx.doi.org/10.1016/0021-9614(85)90063-1.

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16

Zieg, Harald, Wolfgang Pitsch, and Burkhard Koenig. "3(2,4-Dinitrobenzyl)-2,4-pentanedione." Molbank 2002, no. 1 (2003): M289. http://dx.doi.org/10.3390/m289.

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17

P., SHASHIDHARAN, and K. RAMACHANDRAN L. "Role of Amino Groups in the Biological Activity of Cardiotoxin II." Journal of Indian Chemical Society Vol. 62, Nov 1985 (1985): 920–24. https://doi.org/10.5281/zenodo.6326618.

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Department of Biochemistry, Osmania University, Hyderabad-500 007 The importance of free amino groups in the biological activity of cardiotoxin Il was assessed using 2,4-pentanedione as the modifying agent. The amino groups were modified to enamines by 2,4-pentanedione. The modification was completely reversed at low <em>p</em>H or on addition of hydroxyl-amine All ten amino groups, nine side chain and one α-amino group were modified by the reagent, as judged by spectro-photometric data. On modification of the amino groups of cardiotoxin II, there was progressive loss of both lethal

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18

Marchalín, Štefan, Dušan Ilavský, Jaroslav Kováč, and Milan Bruncko. "Synthesis and reactions of 5-acetyl-2-amino-3-cyano-4-(5-X-2-furyl)-6-methyl-4H-pyrans." Collection of Czechoslovak Chemical Communications 55, no. 3 (1990): 718–27. http://dx.doi.org/10.1135/cccc19900718.

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Substituted 2-amino-4-(5-X-2-furyl)-4H-pyrans IIIa-IIIe have been prepared by a cyclization reaction of 5-X-2-furylmethylenepropanedinitriles IIa-IIe with 2,4-pentanedione. In reaction of 3-(5-X-2-furyl)-methylene-2,4-pentanediones Ia-Ie with propanedinitrile the formation of 4H-pyrans IIIa-IIIe is accompanied, depending on the catalyst type, by the formation of 5-X-2-furylmethylenepropanedinitriles IIa-IIe. 2-(4-Methylbenzylideneamino)-4H-pyran (V), 2-formylamino-4H-pyran (VI), and 3H, 5H-pyrano[2,3-d]pyrimidine-4-one (VII) have been synthesized by functional modifications of the amino group

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19

MITKIDOU, S., J. STEPHANIDOU-STEPHANATOU, and H. STEPHOPOULOU. "ChemInform Abstract: Reaction of 3-Benzylidene-2,4-pentanedione and 3-Methoxymethylene-2,4- pentanedione with Aroylhydrazines." ChemInform 24, no. 38 (2010): no. http://dx.doi.org/10.1002/chin.199338171.

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20

Li, Xinli, Ju Zhang, Yunsheng Dai, Congming Tang, and Chenglong Yang. "Confined alkali metal ions in two-dimensional aluminum phosphate promoted activity for the condensation of lactic acid to 2,3-pentanedione." New Journal of Chemistry 45, no. 31 (2021): 13806–13. http://dx.doi.org/10.1039/d1nj02070f.

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21

Malik, Sofia, Komal Jakhar, Devender Singh, et al. "Optimizing white light emission in Dy(iii) complexes: impact of energy transfer from mono and bidentate ligands on luminescence." RSC Advances 14, no. 31 (2024): 22642–55. http://dx.doi.org/10.1039/d4ra03897e.

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22

Hunter, Duncan H., Chantelle McRoberts, and Jagadese J. Vittal. "Bisthiosemicarbazones of 2,4-pentanedione are pyrazolines." Canadian Journal of Chemistry 76, no. 5 (1998): 522–24. http://dx.doi.org/10.1139/cjc-76-5-522.

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23

Cativiela, C., F. Figueras, J. I. García, J. A. Mayoral, and M. M. Zurbano. "Hydrotalcite-Catalyzed Alkylation of 2,4-Pentanedione." Synthetic Communications 25, no. 11 (1995): 1745–50. http://dx.doi.org/10.1080/00397919508015859.

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24

Schutyser, Wouter, Steven-Friso Koelewijn, Michiel Dusselier, et al. "Regioselective synthesis of renewable bisphenols from 2,3-pentanedione and their application as plasticizers." Green Chem. 16, no. 4 (2014): 1999–2007. http://dx.doi.org/10.1039/c4gc00250d.

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25

Feng, Ruilin, Yanlong Qi, Shijun Liu, Long Cui, Quanquan Dai, and Chenxi Bai. "Production of renewable 1,3-pentadiene over LaPO4 via dehydration of 2,3-pentanediol derived from 2,3-pentanedione." Applied Catalysis A: General 633 (March 2022): 118514. http://dx.doi.org/10.1016/j.apcata.2022.118514.

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26

Morales-Cerón, Judith P., Verónica Salazar-Pereda, Daniel Mendoza-Espinosa, et al. "Synthesis of Ir(iii) complexes with TpMe2 and acac ligands and their reactivity with electrophiles." Dalton Transactions 44, no. 31 (2015): 13881–89. http://dx.doi.org/10.1039/c5dt01937k.

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27

Nishizawa, Kaori, Takeshi Miki, Kazuyuki Suzuki, and Kazumi Kato. "Photo-assisted crystallization of zirconia thin films prepared using chelate compounds." Journal of Materials Research 22, no. 9 (2007): 2608–16. http://dx.doi.org/10.1557/jmr.2007.0335.

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A highly crystallized and smooth-surfaced zirconia (ZrO2) thin film was prepared using a precursor solution with 2,4-pentanedione addition (molar ratio of 1:1 for zirconium alkoxide); the film was irradiated with ultraviolet (UV) light using an ultrahigh-pressure mercury lamp. This thin film was compared with another thin film, which prepared using a precursor solution without additives and UV irradiation. The crystallinity of ZrO2 thin films improved with increasing 2,4-pentanedione addition and UV irradiation time and changed according to the type of organic additives. These results occurred

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28

Yagi, Yasuhiko, Hiroshi Inomata, and Shozaburo Saito. "Tautomerization of 2,4-pentanedione in supercritical CO2." JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 26, no. 1 (1993): 116–18. http://dx.doi.org/10.1252/jcej.26.116.

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29

Vrábel, V., J. Lokaj, J. Sivý, D. Ilavský, and A. Bartovič. "3-[5-(2-Nitrophenyl)furfurylidene]-2,4-pentanedione." Acta Crystallographica Section C Crystal Structure Communications 50, no. 11 (1994): 1777–79. http://dx.doi.org/10.1107/s0108270193013277.

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30

Kremer, Marius, and Ulli Englert. "N Donor substituted acetylacetones – versatile ditopic ligands." Zeitschrift für Kristallographie - Crystalline Materials 233, no. 7 (2018): 437–52. http://dx.doi.org/10.1515/zkri-2017-2131.

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Abstract Acetylacetone (2,4-pentanedione) derivatives with N donor substituents represent ditopic ligands with coordination sites of distinctly different Pearson hardness. Deprotonation of the acetylacetone (Hacac) moiety leads to O,O′ chelating monoanionic (acac) ligands suitable for coordination to hard cations. The softer N donor site(s) preferably act as nucleophiles towards softer partners. When the organic molecules are employed as linkers and coordinate via either site, they are often selective and allow to synthesize well-ordered heterometallic solids. This review addresses the derivat

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31

Augusti, Rodinei, Xubin Zheng, M. Turowski, and R. Graham Cooks. "Kinetic Isotope and Collision Energy Effects in the Dissociation of Chloride and Bromide Adducts of Aliphatic Alcohols, Benzaldehyde, and 2,4-Pentanedione." Australian Journal of Chemistry 56, no. 5 (2003): 415. http://dx.doi.org/10.1071/ch02245.

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A tandem-in-space triple quadrupole mass spectrometer was used to measure kinetic isotopic effects (KIEs) for the dissociation of chloride and bromide adducts of several compounds that bind halide anions via either hydrogen bonds or by nucleophilic attachment. Two isotopomers of each adduct were simultaneously mass-selected in the first quadrupole and dissociated by collision with argon in the second quadrupole. The KIEs were measured by comparing the extents of dissociation of the lighter versus the heavier isotopomeric adducts. In most cases, lower collision energies and multiple collision c

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32

Guo, Huan Mei, Yun Chen Zhang, and Yu Feng Li. "Synthesis and Crystal Structure Studies on 3-(4-Fluorophenyl)-1,5-Bis(pyridyl)-1,5-Pentanedione." Advanced Materials Research 926-930 (May 2014): 300–303. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.300.

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3-(4-Fluorophenyl)-1,5-bis (pyridyl)-1,5-pentanedione has been synthesized and the crystal structure has been determined by means of single-crystal X-ray diffraction. In the moleculer structure,the phenyl ring and the two pyridine rings are almost perpendicular , and two pyridine rings are closed to coplane.

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33

Cadierno, Victorio. "(E)-1,1,1-Trifluoro-6,6-bis(4-methoxyphenyl)hexa-3,5-dien-2-one." Molbank 2020, no. 1 (2020): M1120. http://dx.doi.org/10.3390/m1120.

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The title compound was obtained in high yield (84%) via the deacetylation of 3-(3,3-bis(4-methoxyphenyl)allylidene)-1,1,1,5,5,5-hexafluoro-2,4-pentanedione with K2CO3 in refluxing methanol. This previously unreported compound has been fully characterized by 19F{1H}, 1H and 13C{1H} NMR, IR, UV-Vis, and HRMS.

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34

Krishnankutty, K., and Johns Michael. "Diazo Coupling of Metal Chelates of 2,4-Pentanedione." Journal of Coordination Chemistry 22, no. 4 (1990): 327–30. http://dx.doi.org/10.1080/00958979009408232.

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35

Lokaj, J., V. Vrábel, J. Sivý, D. Ilavský, and A. Koreňová. "3-[5-(3-Nitrophenyl)furfurylidene]-2,4-pentanedione, C16H13NO5." Acta Crystallographica Section C Crystal Structure Communications 50, no. 8 (1994): 1312–14. http://dx.doi.org/10.1107/s0108270194000594.

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36

Dowd, Michael K., and Edwin D. Stevens. "The (-)-gossypol-2,4-pentanedione (1:2) inclusion complex." Journal of Chemical Crystallography 34, no. 8 (2004): 559–64. http://dx.doi.org/10.1023/b:jocc.0000042026.45650.c5.

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37

Pei, Li-Xia, Xian-Zhang Bu, Lian-Quan Gu, and Seik Weng Ng. "3-[(4-Hydroxy-3-methoxyphenyl)methylene]-2,4-pentanedione." Acta Crystallographica Section E Structure Reports Online 61, no. 3 (2005): o541—o543. http://dx.doi.org/10.1107/s1600536805002941.

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38

CATIVIELA, C., F. FIGUERAS, J. I. GARCIA, J. A. MAYORAL, and M. M. ZURBANO. "ChemInform Abstract: Hydrotalcite-Catalyzed Alkylation of 2,4-Pentanedione." ChemInform 26, no. 36 (2010): no. http://dx.doi.org/10.1002/chin.199536086.

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39

Gruhn, Nadine E., Laura J. Michelsen, and Barry L. Westcott. "Photoelectron Spectroscopy of Bis(2,4-Pentanedione)−Oxovanadium(IV) [VO(acac)2] and Derivatives: Substituent Effects on the 2,4-Pentanedione Donor." Inorganic Chemistry 41, no. 22 (2002): 5907–11. http://dx.doi.org/10.1021/ic0256056.

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40

Messaadia, L., G. El Dib, A. Ferhati, and A. Chakir. "UV–visible spectra and gas-phase rate coefficients for the reaction of 2,3-pentanedione and 2,4-pentanedione with OH radicals." Chemical Physics Letters 626 (April 2015): 73–79. http://dx.doi.org/10.1016/j.cplett.2015.02.032.

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41

Milata, Viktor, Dušan Ilavský, Igor Goljer, and Ján Leško. "4-N-Benzazolylamino Derivatives of 3-Y-3-Buten-2-one." Collection of Czechoslovak Chemical Communications 57, no. 3 (1992): 531–39. http://dx.doi.org/10.1135/cccc19920531.

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Ethoxymethylene derivatives of 2,4-pentanedione (Ia), 3-oxobutanenitrile (Ib), methyl (Ic) or ethyl (Id) 3-oxobutanoate give with 4- or 5-aminobenzimidazole or benzotriazole, respectively, under mild conditions products of nucleophilic substitution II-V. Structure of these compounds was discussed on the basis of their spectral measurements - IR, UV, 1H, 13C NMR and mass spectra.

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42

Mishra, Lallan, Ajay K. Yadaw, Ratna S. Phadke, Chang S. Choi, and Koji Araki. "Studies on Some New Ru(III) Complexes Using aryl-azo Pentane- 2,4-dione and 2,6-bis (2'-Benzimidazolyl) Pyridine as Ligands: Synthesis, Spectroscopic, Luminescent, Electrochemical and Biological Activities." Metal-Based Drugs 8, no. 2 (2001): 65–71. http://dx.doi.org/10.1155/mbd.2001.65.

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Some ruthenium(III) complexes with aryl-azo 2,4-pentanedione as co-ligands (LH1-LH3) have been synthesized and characterized spectroscopically IR, H1 NMR, UV/Vis, ESR, conductimetric) along with elemental analysis and FAB-mass data. Their luminescent and redox properties have been studied. The antibacterial, anti-HIV and antitmnour activities have also been reported.

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43

Prasad, R. N., Mithlesh Agrawal та Sanjna Sharma. "Cobalt(II) complexes of tetraazamacrocycles derived from β-diketones and diaminoalkanes". Journal of the Serbian Chemical Society 70, № 4 (2005): 635–41. http://dx.doi.org/10.2298/jsc0504635p.

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Co(II) complexes of the type [Co(L)(NO3)2] (L = tetraazamacrocycle with 18 to 34-membered ring) were synthesized by the template condensation of ?-diketones, such as 2,4-pentanedione, 1-phenyl-1,3-butanedione or 1,3-diphenyl-1,3-propanedione, with diaminoalkanes. The complexes were characterized by elemental analyses, molar conductances and magnetic moments measurements, as well as infra red and electronic spectroscopy.

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44

BOWLES, BOBBY L., and ARTHUR J. MILLER. "Antibotulinal Properties of Selected Aromatic and Aliphatic Ketones." Journal of Food Protection 56, no. 9 (1993): 795–800. http://dx.doi.org/10.4315/0362-028x-56.9.795.

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Several aromatic and aliphatic ketones were tested for inhibitory activity against Clostridium botulinum spores and cells. Six-tenths mM 3-heptanone, 3-hexanone, or benzophenone delayed spore germination in botulinal assay medium (BAM) broth at 32°C. Sporicidal activity was observed for 1,250 mM 2,3-pentanedione, while 2-octanone, 3-octanone, or benzophenone were effective at 2,500 mM. In general, higher concentrations were required to inhibit vegetative cells than to prevent spore germination. Maximum activity against vegetative cells was observed at 25 mM acetanisole (4′-methoxyacetophenone)

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45

Zhao, Xiaoxin, Yuanyuan Ge, Xuejian Yu, et al. "Fermentation Characteristics of Fermented Milk with Streptococcus thermophilus CICC 6063 and Lactobacillus helveticus CICC 6064 and Volatile Compound Dynamic Profiles during Fermentation and Storage." Molecules 29, no. 6 (2024): 1257. http://dx.doi.org/10.3390/molecules29061257.

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The lactic acid bacteria Streptococcus thermophilus and Lactobacillus helveticus are commonly used as starter cultures in dairy product production. This study aimed to investigate the characteristics of fermented milk using different ratios of these strains and analyze the changes in volatile compounds during fermentation and storage. A 10:1 ratio of Streptococcus thermophilus CICC 6063 to Lactobacillus helveticus CICC 6064 showed optimal fermentation time (4.2 h), viable cell count (9.64 log10 colony-forming units/mL), and sensory evaluation score (79.1 points). In total, 56 volatile compound

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Calam, Eduard, Eva González-Roca, M. Rosario Fernández, et al. "Enantioselective Synthesis of Vicinal (R,R)-Diols by Saccharomyces cerevisiae Butanediol Dehydrogenase." Applied and Environmental Microbiology 82, no. 6 (2016): 1706–21. http://dx.doi.org/10.1128/aem.03717-15.

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ABSTRACTButanediol dehydrogenase (Bdh1p) fromSaccharomyces cerevisiaebelongs to the superfamily of the medium-chain dehydrogenases and reductases and converts reversiblyR-acetoin andS-acetoin to (2R,3R)-2,3-butanediol andmeso-2,3-butanediol, respectively. It is specific for NAD(H) as a coenzyme, and it is the main enzyme involved in the last metabolic step leading to (2R,3R)-2,3-butanediol in yeast. In this study, we have used the activity of Bdh1p in different forms—purified enzyme, yeast extracts, permeabilized yeast cells, and as a fusion protein (with yeast formate dehydrogenase, Fdh1p)—to

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Ballantyne, Bryan, Darol E. Dodd, Roy C. Myers, and Donald J. Nachreiner. "The Acute Toxicity and Primary Irritancy of 2,4-Pentanedione." Drug and Chemical Toxicology 9, no. 2 (1986): 133–46. http://dx.doi.org/10.3109/01480548608998271.

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Bellver, C., and A. López-Castro. "Structure of 3-phenyl-3-piperidino-2,4-pentanedione monooxime." Acta Crystallographica Section C Crystal Structure Communications 46, no. 10 (1990): 1848–50. http://dx.doi.org/10.1107/s010827018901320x.

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George, Mark A., Kris M. Young, Eric A. Robertson, Scott E. Beck, and George Voloshin. "Vapor Pressure and Viscosity of 1,1,1,5,5,5-Hexafluoro-2,4-pentanedione." Journal of Chemical & Engineering Data 43, no. 1 (1998): 60–64. http://dx.doi.org/10.1021/je9700941.

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Poisson, Lionel, Pascale Roubin, Stéphane Coussan, Benoît Soep, and Jean-Michel Mestdagh. "Ultrafast Dynamics of Acetylacetone (2,4-Pentanedione) in the S2State." Journal of the American Chemical Society 130, no. 10 (2008): 2974–83. http://dx.doi.org/10.1021/ja0730819.

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