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Journal articles on the topic '1-penten-3-one'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

O Dwyer, M. A., T. J. Carey, R. M. Healy, J. C. Wenger, B. Picquet-Varrault, and J. F. Doussin. "The Gas-phase Ozonolysis of 1-Penten-3-ol, (Z)-2-Penten-1-ol and 1-Penten-3-one: Kinetics, Products and Secondary Organic Aerosol Formation." Zeitschrift für Physikalische Chemie 224, no. 7-8 (2010): 1059–80. http://dx.doi.org/10.1524/zpch.2010.6141.

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2

Almirón, M. A., L. Camacho, E. Muñoz, J. L. Avila, and J. V. Sinisterra. "Electrochemical reduction of 4,4-dimethyl-1-phenyl-1-penten-3-one." Journal of Electroanalytical Chemistry and Interfacial Electrochemistry 241, no. 1-2 (1988): 297–308. http://dx.doi.org/10.1016/0022-0728(88)85133-7.

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3

Kurniadi, Toshinari H., Rachid Bel Rhlid, Marcel A. Juillerat, Martin Schüler, and Ralf G. Berger. "Enantiogenic synthesis of (R)-(−)-3-hydroxy-1-penten-4-one." Tetrahedron: Asymmetry 14, no. 3 (2003): 363–66. http://dx.doi.org/10.1016/s0957-4166(02)00800-5.

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4

Illmann, Niklas, Rodrigo Gastón Gibilisco, Iustinian Gabriel Bejan, Iulia Patroescu-Klotz та Peter Wiesen. "Atmospheric oxidation of <i>α</i>,<i>β</i>-unsaturated ketones: kinetics and mechanism of the OH radical reaction". Atmospheric Chemistry and Physics 21, № 17 (2021): 13667–86. http://dx.doi.org/10.5194/acp-21-13667-2021.

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Abstract. The OH-radical-initiated oxidation of 3-methyl-3-penten-2-one and 4-methyl-3-penten-2-one was investigated in two atmospheric simulation chambers at 298±3 K and 990±15 mbar using long-path FTIR spectroscopy. The rate coefficients of the reactions of 3-methyl-3-penten-2-one and 4-methyl-3-penten-2-one with OH radicals were determined to be (6.5±1.2)×10-11 and (8.1±1.3)×10-11 cm3molecule-1s-1, respectively. To enlarge the kinetics data pool the rate coefficients of the target species with Cl atoms were determined to be (2.8±0.4)×10-10 and (3.1±0.4)×10-10 cm3molecule-1s-1, respectively.

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5

Jiménez, Elena, Beatriz Lanza, María Antiñolo, and José Albaladejo. "Photooxidation of Leaf-Wound Oxygenated Compounds, 1-Penten-3-ol, (Z)-3-Hexen-1-ol, and 1-Penten-3-one, Initiated by OH Radicals and Sunlight." Environmental Science & Technology 43, no. 6 (2009): 1831–37. http://dx.doi.org/10.1021/es8027814.

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6

Patjens, Jan, and Paul Margaretha. "1-Amino- und 1-Alkylamino-4-hydroxy-4-methyl-1-penten-3-one aus 2,2-Dimethyl-3(2H)-furanon." Synthesis 1990, no. 06 (1990): 476–77. http://dx.doi.org/10.1055/s-1990-26909.

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7

Xie, Wan Cui, Xin Lian, Xi Hong Yang, Ya Dong Yang, and Dan Hui Mao. "Optimization of the SPME-GC-MS Techniques for Analyzing Headspace Volatiles in Shrimp Head of P. borealis." Advanced Materials Research 726-731 (August 2013): 416–19. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.416.

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To investigate the headspace volatiles in shrimp head P. borealis, optimized conditions were evaluated for solid-phase microextraction coupled to gas chromatography-mass spectrometry method. SPME fibers of 100-μm polydimetylsiloxane, 65-μm polydimetylsiloxane-divinylbenzene, 75-μm carboxen-polydimetylsiloxane, and 50/30-μm divinylbenzene-carboxen-polydimetylsiloxane (DVB/CAR/PDMS) were compared. The influence of several parameters such as type of fibers, volume of sample, extraction time, extraction temperature, and state of samples was systematically investigated. Suitable reproducibility and

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8

Kamar, Afaf, Alexander Baldwin Young, and Raymond Evans March. "Experimentally determined proton affinities of 4-methyl-3-penten-2-one, 2-propyl ethanoate, and 4-hydroxy-4-methyl-2-pentanone in the gas phase." Canadian Journal of Chemistry 64, no. 12 (1986): 2368–70. http://dx.doi.org/10.1139/v86-391.

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Proton affinities have been determined for 4-methyl-3-penten-2-one, 2-propyl ethanoate, and 4-hydroxy-4-methyl-2-pentanone in the gas phase at 333 K. A quadrupole ion store (QUISTOR) was employed to study mass spectrometrically the equilibrium between a species of known proton affinity and one of the above compounds; equilibrium between protonated species was monitored over an ion storage duration of 100 ms. The values of the proton affinities were found to be 870.5 ± 0.8 kJ mol−1 for 4-methyl-3-penten-2-one (mesityl oxide); 842.7 ± 0.6 kJ mol−1 for 2-propyl ethanoate; and 831.6 ± 0.8 kJ mol−1

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9

Håkansson, Mikael, Susan Jagner, and Martin Nilsson. "Synthesis and crystal structure of a polymeric complex between 1-penten-3-one and copper(1) chloride." Journal of Organometallic Chemistry 336, no. 1-2 (1987): 279–85. http://dx.doi.org/10.1016/0022-328x(87)87175-9.

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10

Wang, Jing, Li Zhou, Weigang Wang, and Maofa Ge. "Gas-phase reaction of two unsaturated ketones with atomic Cl and O3: kinetics and products." Physical Chemistry Chemical Physics 17, no. 18 (2015): 12000–12012. http://dx.doi.org/10.1039/c4cp05461j.

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The rate constants and products for the reactions of atomic Cl and O<sub>3</sub> molecule with 3-methyl-3-buten-2-one (MBO332) and 3-methyl-3-penten-2-one (MPO332) were determined in a 100 L Teflon chamber at 293 ± 1 K and atmospheric pressure.

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11

Botvinnik, E. V., A. N. Blandov, and M. A. Kuznetsov. "ChemInform Abstract: Reaction of 1,5-Diphenyl-1,4-pentadien-3-one and 1,5-Diphenyl-1-penten-4-yn-3-one with Monosubstituted Hydrazines." ChemInform 32, no. 40 (2010): no. http://dx.doi.org/10.1002/chin.200140118.

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12

Maul, Fernando, Steven A. Sargent, Murat O. Balaban, Elizabeth A. Baldwin, Donald J. Huber, and Charles A. Sims. "Aroma Volatile Profiles from Ripe Tomatoes are Influenced by Physiological Maturity at Harvest: An Application for Electronic Nose Technology." Journal of the American Society for Horticultural Science 123, no. 6 (1998): 1094–101. http://dx.doi.org/10.21273/jashs.123.6.1094.

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The effect of physiological maturity at harvest on ripe tomato (Lycopersicon esculentum Mill.) volatile profiles was studied using ripening response time (in days) to 100 μL·L-1 exogenous ethylene treatment as a tool to separate immature-green from mature-green fruit. Electronic nose (EN) sensor array and gas chromatography (GC) analyses were used to document volatile profile changes in tomatoes that required a 1-, 3-, or 5-day ethylene treatment to reach the breaker stage. EN output analysis using multivariate discriminant and canonical analyses classified intact tomato and whole tomato homog

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13

Tecle, H., D. J. Lauffer, R. E. Davis, et al. "(±)-1-Azabicyclo[2.2.1]heptan-3-one, O-(3-methyl-5-aryl-2-penten-4-ynyl) oximes: Potent muscarinic agonists." Bioorganic & Medicinal Chemistry Letters 5, no. 6 (1995): 637–42. http://dx.doi.org/10.1016/0960-894x(95)00087-a.

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14

Moretti, Celso L., Elizabeth A. Baldwin, Steven A. Sargent, and Donald J. Huber. "Internal Bruising Alters Aroma Volatile Profiles in Tomato Fruit Tissues." HortScience 37, no. 2 (2002): 378–82. http://dx.doi.org/10.21273/hortsci.37.2.378.

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Tomato (Lycopersicon esculentum Mill.) fruit, cv. Solar Set, were harvested at the mature-green stage and treated with 50 μL·L-1 ethylene at 20 °C. Individual fruits at the breaker stage (<10% red color) were dropped onto a solid surface to induce internal bruising. Dropped and undropped fruit were stored at 20 °C until red-ripe, at which time pericarp, placental, and locule tissues were excised. Tissues from dropped tomatoes were examined for evidence of internal bruising and all tissues were analyzed for selected volatile profiles via headspace analysis. Individual volatile profiles of th

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15

Buchbauer, Gerhard, Leopold Jirovetz, Michael Wasicky, and Alexej Nikiforov. "Headspace Constituents of Shellac." Zeitschrift für Naturforschung B 48, no. 2 (1993): 247–48. http://dx.doi.org/10.1515/znb-1993-0223.

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AbstractBy headspace analysis of the CO2-extract of shellac 4-methyl-3-penten-2-one (29.57%), 4-hydroxy-4-methyl-2-pentanone (16.66%) and 3-methyl-1-butanol (15.41%) could be identified as main constituents, as well as nearly forty hitherto unknown minor constituents (hydrocarbons, alcohols, aldehydes, ketones, acids and mainly C4-C8-esters). This investigation was carried out using GC-FID, GC-FTIR-MS and GC-Sniffing-Technique.

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16

DIMMOCK, J. R., P. KUMAR, M. CHEN, et al. "ChemInform Abstract: Synthesis and Cytotoxic Evaluation of Mesna Adducts of Some 1-Aryl-4,4- dimethyl-5-(1-piperidino)-1-penten-3-one Hydrochlorides." ChemInform 26, no. 44 (2010): no. http://dx.doi.org/10.1002/chin.199544147.

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17

Tokuno, K., M. Matsui, F. Miyoshi, Y. Asao, T. Ohashi, and K. Kihara. "Structures of the s-cis and s-trans conformers of (E)-5-methylthio-1,5-diphenyl-1-penten-3-one." Acta Crystallographica Section C Crystal Structure Communications 42, no. 1 (1986): 85–88. http://dx.doi.org/10.1107/s0108270186097226.

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18

Mall, Veronika, Ines Sellami, and Peter Schieberle. "New Degradation Pathways of the Key Aroma Compound 1-Penten-3-one during Storage of Not-from-Concentrate Orange Juice." Journal of Agricultural and Food Chemistry 66, no. 42 (2018): 11083–91. http://dx.doi.org/10.1021/acs.jafc.8b04334.

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19

Kuo, F., and P. L. Fuchs. "Use of 1-Penten-3-One-4- Phosphonate as a Kinetic Ethyl Vinyl Ketone Equivalent in the Robinson Annulation Reaction1." Synthetic Communications 16, no. 14 (1986): 1745–59. http://dx.doi.org/10.1080/00397918608057197.

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20

Kamar, Afaf, Alexander Baldwin Young, and Raymond Evans March. "A comparative ion chemistry study of acetone, diacetone alcohol, and mesityl oxide." Canadian Journal of Chemistry 64, no. 10 (1986): 1979–88. http://dx.doi.org/10.1139/v86-328.

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The evolution of ion species by unimolecular and bimolecular reactions, both concurrent and sequential, has been investigated for each of 2-propanone, d6-2-propanone, 4-hydroxy-4-methyl-2-pentanone, and 4-methyl-3-penten-2-one. Infrared multiphoton dissociation (IRMPD) has been used in order to differentiate between gaseous ionic isomers. It is concluded that the isomeric species, protonated 2-propanone dimer and protonated 4-hydroxy-4-methyl-2-pentanone, both of m/z 117, are of different structures. The ion species C6H11O+ of m/z 99, and its perdeuterated analogue, which is observed in all th

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21

Devkota, Hari Prasad, Khem Raj Joshi, Takashi Watanabe, and Shoji Yahara. "Chemical Constituents from the Roots, Stems and Leaves of Diplomorpha sikokiana." Natural Product Communications 11, no. 4 (2016): 1934578X1601100. http://dx.doi.org/10.1177/1934578x1601100413.

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Four diarylpentanoids (1–4), two phenylpropanoids (5–6), three biflavonoids (7–9), two lignans (10–11) and a coumarin (12) were isolated from the roots of Diplomorpha sikokiana (Franchet & Savatier) Honda (Family: Thymelaeaceae). Similarly, two phenylpropanoids (5–6), five biflavonoids (7–9, 13, 14), three lignans (11, 15, 16), a flavonoid (17) and two coumarins (12, 18) were isolated from the stems, and five flavonoids (17, 19–22) from the leaves. Among them, 1,5-diphenyl-1-pentanone (1), 1,5-diphenyl-2-penten-1-one (2), 3( S)-hydroxy-1,5-diphenylpentane (3), stelleranol (8), (-)-syringar

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22

Sexton, Daniel J., Jonathan R. Dimmock, and Bulent Mutus. "A spectrophotometric glutathione S-transferase assay displaying alpha-class selectivity utilizing l-p-chlorophenyl-4,4-dimethyl-5-diethylamino-l-penten-3-one hydrobromide." Biochemistry and Cell Biology 71, no. 1-2 (1993): 98–101. http://dx.doi.org/10.1139/o93-016.

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The conjugation of 1-p-chlorophenyl-4,4-dimethyl-5-diethylamino-1-penten-3-one hydrobromide (CDDP), a Mannich base of an α,β-unsaturated ketone, to glutathione is catalyzed selectively by alpha-class glutathione S-transferase. The reaction of CDDP with glutathione can be monitored continuously by following the conjugation-dependent decrease in absorbance of CDDP at 307 nm. The Km and Vmax for CDDP with alpha-class glutathione S-transferase from horse liver were determined to be 226 μM and 14.6 μmol/(min∙mg), respectively. CDDP is the first example of an alpha-class glutathione S-transferase se

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23

Gibilisco, Rodrigo Gastón, Ian Barnes, Iustinian Gabriel Bejan, and Peter Wiesen. "Atmospheric fate of two relevant unsaturated ketoethers: kinetics, products and mechanisms for the reaction of hydroxyl radicals with (<i>E</i>)-4-methoxy-3-buten-2-one and (1<i>E</i>)-1-methoxy-2-methyl-1-penten-3-one." Atmospheric Chemistry and Physics 20, no. 14 (2020): 8939–51. http://dx.doi.org/10.5194/acp-20-8939-2020.

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Abstract. The kinetics of the gas phase reactions of hydroxyl radicals with two unsaturated ketoethers (UKEs) at (298±3) K and 1 atm of synthetic air have been studied for the first time using the relative-rate technique in an environmental reaction chamber by in situ Fourier-transform infrared spectroscopy (FTIR). The rate coefficients obtained using propene and isobutene as reference compounds were (in units of 10−10 cm3 molecule−1 s−1) as follows: kTMBO (OH + (E)-4-methoxy-3-buten-2-one) = (1.41±0.11) and kMMPO (OH + (1E)-1-methoxy-2-methyl-1-penten-3-one) = (3.34±0.43). In addition, quanti

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24

Gu, Sai Qi, Na Wu, Xi Chang Wang, Jing Jing Zhang, and Si Ru Ji. "Analysis of Key Odor Compounds in Steamed Chinese Mitten Crab (Eriocheir sinensis)." Advanced Materials Research 941-944 (June 2014): 1026–35. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.1026.

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Key odor compounds in different edible parts (abdomen, claw, leg meat and gonad) of steamed female Chinese mitten crab (Eriocheir sinensis) were extracted by a new type of adsorbent (MonoTrap), identified by gas chromatography-mass spectrometry (GC-MS) and determined by gas chromatography-olfactometry (GC-O). Ninteen key odor compounds (odor intensity value≥3) were obtained in Chinese mitten crab, among which trimethylamine (fishy), (Z)-4-heptenal (fishy) and 2-ethylpyridine (roasted potato) were found in all four edible parts of Eriocheir sinensis. In addition, 8 KOCs (2-ethylfuran, benzaldeh

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25

Thammarat, Poowadol, Chadin Kulsing, Kanet Wongravee, Natchanun Leepipatpiboon, and Thumnoon Nhujak. "Identification of Volatile Compounds and Selection of Discriminant Markers for Elephant Dung Coffee Using Static Headspace Gas Chromatography—Mass Spectrometry and Chemometrics." Molecules 23, no. 8 (2018): 1910. http://dx.doi.org/10.3390/molecules23081910.

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Elephant dung coffee (Black Ivory Coffee) is a unique Thai coffee produced from Arabica coffee cherries consumed by Asian elephants and collected from their feces. In this work, elephant dung coffee and controls were analyzed using static headspace gas chromatography hyphenated with mass spectrometry (SHS GC-MS), and chemometric approaches were applied for multivariate analysis and the selection of marker compounds that are characteristic of the coffee. Seventy-eight volatile compounds belonging to 13 chemical classes were tentatively identified, including six alcohols, five aldehydes, one car

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26

Malik, Hermen, and Douglas D. Archbold. "Manipulating Primocane Architecture in Thornless Blackberry with Uniconazole, GA3, and BA." HortScience 27, no. 2 (1992): 116–18. http://dx.doi.org/10.21273/hortsci.27.2.116.

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The potential for plant growth regulator (PGR) manipulation of `Chester Thornless' blackberry (fibus spp.) primocane growth was evaluated. PGR treatments included combinations of soil-applied uniconazole at 1, 5, 25, and 125 mg/plant and GA, foliar-applied one or two times at 100 ppm 3 and 4 weeks after a 25-mg/plant uniconazole application. Also, GA and BA were applied at 100 ppm alone or in combination one, two, or three times. Increasing rates of uniconazole reduced primocane length, leaflet count, and leaf, cane, and root dry weights. GA, applications reduced primocane length and increased

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27

Schmid, Günter, and Wolfgang Meyer-Zaika. "Azaborolyl-Komplexe, 27 / Azaborolyl Complexes, 27." Zeitschrift für Naturforschung B 47, no. 5 (1992): 635–39. http://dx.doi.org/10.1515/znb-1992-0505.

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Alkenyl substituted 1H-1,2-azaborolyl (Ab) complexes are promising candidates for stereoselective reactions, due to the chirality of the AbM moiety and the intramolecular coordination of the alkenyl group to the metal atom. The synthesis of [1-tert-butyl-2-methy1-3-(4-penten- l -y1)-η5-1H-1,2-azaborolyl]-bis(triphenylphosphine)rhodium (3) is achieved by the reaction of AbLi (2) [from AbH (1)] with (Ph3P)3RhCl. In benzene solution one PPh3 ligand of 3 is substituted by the C=C group of the pentenyl substituent. Simultaneously the η5-coordination of the Ab ring changes to an allylic η3-coordinat

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28

Khiari, D., I. H. Suffet, and S. E. Barrett. "The determination of compounds causing fishy/swampy odors in drinking water supplies." Water Science and Technology 31, no. 11 (1995): 105–12. http://dx.doi.org/10.2166/wst.1995.0413.

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Two chemical isolation methods, closed-loop stripping analysis (CLSA) and simultaneous distillation/extraction (SDE) in combination with gas chromatography/mass spectroscopy (GC/MS) and two sensory methods, flavor profile analysis (FPA) and sensory GC analysis, were used to determine the compounds responsible for the fishy/swampy odors in potable water. Samples were collected during four different fishy/swampy odor episodes and analyzed. It was determined that the compounds should be extracted by the SDE method. The SDE method extracts more polar compounds than the CLSA method. The main compou

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29

Ke, Dangyang, and Michael Boersig. "Sensory and Chemical Analyses of Tomato Flavor." HortScience 31, no. 4 (1996): 599b—599. http://dx.doi.org/10.21273/hortsci.31.4.599b.

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Consumer acceptance of sensory quality was significantly correlated (P = 0.05) with overall eating quality of tomatoes (Lycopersicon esculentum Mill.) determined by a trained taste panel. The overall eating quality was partitioned into three flavor components (sweetness, sourness, and aroma) and internal texture. Relationships between the sensory flavor components and concentrations of several chemical compounds were analyzed in tomatoes of eleven varieties within a range of acceptable texture. Sweetness was significantly correlated with total sugar concentration and overall flavor at P = 0.01

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30

Baldwin, Elizabeth A., Myrna O. Nisperos-Carriedo, and Manuel G. Moshonas. "QUANTITATIVE ANALYSIS OF FLAVOR VOLATILES AND OTHER PARAMETERS IN TWO TOMATO VARIETIES DURING RIPENING." HortScience 25, no. 9 (1990): 1090d—1090. http://dx.doi.org/10.21273/hortsci.25.9.1090d.

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Whole tomato fruit (Lycopersicon esculentum Mill.), cvs. Sunny and Solarset, were analyzed at 5 different ripening stages for ethylene and CO2 production. Homogenates from the same fruit were prepared for determination of color, flavor volatiles, sugars and organic acids. Of the flavor volatiles measured, only eugenol decreased during ripening in both varieties and 1-penten-3-one in `Sunny' tomatoes. Ethanol, and trans-2-trans-4-decadienal levels showed no change or fluctuated as the fruit matured while all other volatiles measured (cis-3-hexenol, 2-methyl-3-butanol, vinyl guiacol, acetaldehyd

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31

Baldwin, E. A., J. W. Scott, and F. Maul. "Effect of Harvest Maturity and Ethylene Gassing on Tomato Flavor Volatile Concentrations." HortScience 33, no. 3 (1998): 490a—490. http://dx.doi.org/10.21273/hortsci.33.3.490a.

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Tomato fruit (Lycopersicon esculentum Mill.) cvs. Solar Set and Olympic were harvested at three maturity stages: green (stage 1, USDA color classification) gassed with 100 ppm ethylene, green not gassed, turning (stage 4), and red-ripe (stage 6). After ripening at 21 °C, the fruit were homogenized with CaCl2 and analyzed for important flavor volatile compounds. For `Solar Set', acetone, ethanol, 1-penten-3-one, hexanal, and trans-2-heptenal were significantly higher in red-harvested fruit, while 2+3-methylbutanol, and trans-2-hexenal were higher in green-harvested fruit. trans-2-Hexenal was at

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32

Mutus, Bulent, Jerome D. Wagner, Christopher J. Talpas, Jonathan R. Dimmock, Oludotun A. Phillips, and R. Stephen Reid. "1-p-Chlorophenyl-4,4-dimethyl-5-diethylamino-1-penten-3-one hydrobromide, a sulfhydryl-specific compound which reacts irreversibly with protein thiols but reversibly with small molecular weight thiols." Analytical Biochemistry 177, no. 2 (1989): 237–43. http://dx.doi.org/10.1016/0003-2697(89)90045-6.

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33

Cao, Simin, Yangyi Liu, Litao Zhao, et al. "Rapid, Wide-Range, and Low-Cost Determination of Formaldehyde Based on Porous Silica Gel Plate by Digital Image Colorimetry." Proceedings 42, no. 1 (2019): 13. http://dx.doi.org/10.3390/ecsa-6-06542.

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A porous silica gel plate impregnated with a colorimetric reagent, 4-amino-3-penten-2-one (Fluoral-P) has been fabricated for the first time to determinate formaldehyde. The reaction of formaldehyde and Fluoral-P produced a yellow product 3,5-diacetyl-1,4-dihydrolutidine (DDL), which was further photographed by a smartphone. A good linear relationship has been found between the intensity of blue component from the digital image and formaldehyde concentration in the range of 0–50 mg L−1 with low detection limit of 2.2 ± 0.1 mg L−1. A good precision in the range of 0.59–7.75%RSD and an accuracy

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34

Duhaime, Randy M., та Alan C. Weedon. "Direct observation of dienols produced by photochemical enolisation of α,β-unsaturated ketones: rates and activation parameters for dienol reketonisation via a 1,5-hydrogen shift". Canadian Journal of Chemistry 65, № 8 (1987): 1867–72. http://dx.doi.org/10.1139/v87-313.

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The production of stable solutions of Z-dienols by ultraviolet light irradiation of α,β-unsaturated ketones at low temperatures (ca. −76 °C) in d4-methanol is reported. The rates of reketonisation of the dienols via a 1,5-sigmatropic hydrogen shift were determined at various temperatures between −43 °C and + 2 °C by monitoring the proton nmr spectra of the dienols. From the data the activation parameters for the reaction were calculated. For the dienol Z-2-hydroxy-4-methyl-2,4-pentadiene, 2, derived from photoenolisation of 4-methyl-3-penten-2-one, 1, the activation energy from the Arrhenius p

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35

Kaškonienė, Vilma, Paulius Kaškonas, Audrius Maruška, and Loreta Kubilienė. "Chemometric analysis of volatiles of propolis from different regions using static headspace GC-MS." Open Chemistry 12, no. 6 (2014): 736–46. http://dx.doi.org/10.2478/s11532-014-0521-7.

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AbstractSix samples of propolis were analyzed in the paper: a sample from Brazil, Estonia, China and three samples from different locations of Uruguay. Static headspace technique coupled with gas chromatography-mass spectrometry analysis has been applied for the determination of the characteristic volatile profile with the aim to differentiate the propolis from different regions. Monoterpenes (α- and β-pinenes) were predominant in all samples, except the sample from China. This sample separated itself by the alcohols 3-methyl-3-buten-1-ol and 3-methyl-2-buten-1-ol, (40.33% and 11.57%, respecti

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36

Ramos, Arsenio, and Antonio Acedo Jr. "Morphological Effects of Paclobutrazol on the Regrowth of Rejuvenated Coffee (Coffea arabica L.) Trees." Science and Humanities Journal 10, no. 1 (2013): 36–53. http://dx.doi.org/10.47773/shj.1998.101.3.

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This study was conducted to determine the morphological response of the regrowth of rejuvenated coffee (Coffea arabica L.) to varying timing and levels of application of Paclobutrazol (PBZ) [2RS, 3RS)-1-4 (-chlorophenyl)-4,4-dimethyl-2-1, 2, 4-triazol-1-yl-penten-3-ol]. Plants applied with PBZ two months before cutting had delayed shoot emergence, were shorted and had bigger lateral brances but with comparable percent plant survival, vertical shoot stem characteristics, lateral branch morphology, leaf morphology and root volume and dry weight compared to those applied with PBZ one month before

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37

Raabe, Gerhard, Wolfgang Karl, Dieter Enders, and Jörg Fleischhauer. "Conformational Aspects of Substituents in Enamines. X-Ray Structure Analyses and Quantum Chemical Calculations." Zeitschrift für Naturforschung A 47, no. 7-8 (1992): 869–76. http://dx.doi.org/10.1515/zna-1992-7-812.

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Abstract X-ray structure determination of the enamine (Z)-4-(6'-t-butoxycarbonyl-2',2'-dimethyl-5'-phenyl- 3'-hexen-3'-yl)morpholine (1) reveals that certain bulky groups may enforce a relative orientation of the molecular subunits without conjugative interaction between the nitrogen lone pair and the olefinic double bond. According to the results of quantum chemical ab initio calculations the experimentally found arrangement would be the least favourable one in the absence of such substituents. A careful analysis of the molecular structure of 1 shows that this unusual arrangement is due to th

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38

Wang, Libin, Elizabeth A. Baldwin, Zhifang Yu, and Jinhe Bai. "The Impact of Kitchen and Food Service Preparation Practices on the Volatile Aroma Profile in Ripe Tomatoes: Effects of Refrigeration and Blanching." HortScience 50, no. 9 (2015): 1358–64. http://dx.doi.org/10.21273/hortsci.50.9.1358.

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Both refrigeration and blanching of red-stage tomatoes are common practices in Japan home kitchens and in food service operations. However, little is reported on the impact of such practices on aroma profiles in tomato fruits. In this study, ‘FL 47’ tomatoes at red stage were dipped in 50 °C hot water for 5 minutes or exposed to 5 °C for 4 days to simulate consumer handling of tomato in food service or home kitchens, respectively. Of the 42 volatile compounds detected, refrigeration generally suppressed production of aldehydes, alcohols, oxygen-containing heterocyclic compounds, and nitrogen-

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39

Alonso, A., R. García-Aliaga, S. García-Martínez, J. J. Ruiz, and A. A. Carbonell-Barrachina. "Characterization of Spanish Tomatoes using Aroma Composition and Discriminant Analysis." Food Science and Technology International 15, no. 1 (2009): 47–55. http://dx.doi.org/10.1177/1082013208102385.

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Nowadays, tomato breeders are trying to associate high fruit firmness, long shelf life, high disease resistance, and good flavor; however, breeding for sensory quality has been severely restricted up to date. In this study, a system specifically designed for the analysis of low amounts of material has been set up and tested to quantify the volatile aroma constituents of tomatoes. Ten volatile compounds with a major contribution to tomato aroma have been quantitatively determined in two traditional tomato types (Muchamiel and De la Pera) and one hybrid type (Odissea). Both traditional types pre

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40

Baldwin, E. A., M. O. Nisperos-Carriedo, and M. G. Moshonas. "Quantitative Analysis of Flavor and Other Volatiles and for Certain Constituents of Two Tomato Cultivars during Ripening." Journal of the American Society for Horticultural Science 116, no. 2 (1991): 265–69. http://dx.doi.org/10.21273/jashs.116.2.265.

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Tomato (Lycopersicon esculentum Mill.) fruit, cvs. Sunny and Solar Set, were analyzed at five ripening stages for ethylene and CO2 production. Homogenates from the same fruit were prepared for determination of color, flavor volatiles, sugars, and organic acids. Changes in the levels of these compounds were compared to the pattern of climacteric ethylene production. Of the flavor volatiles measured, only eugenol decreased during ripening in both cultivars and 1-penten-3-one in `Sunny' tomatoes. Ethanol and trans-2-trans- 4-decadienal levels showed no change or fluctuated as the fruit ripened wh

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41

Kim, Su-Jeong, Jun-Young Lee, Yun-Sang Choi, Jung-Min Sung, and Hae Won Jang. "Comparison of Different Types of SPME Arrow Sorbents to Analyze Volatile Compounds in Cirsium setidens Nakai." Foods 9, no. 6 (2020): 785. http://dx.doi.org/10.3390/foods9060785.

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Cirsium setidens Nakai is a perennial plant extensively used as food in Korea. Various reports have illustrated the presence of phytochemicals with antioxidant, anti-cancer, anti-tumor, and anti-inflammatory activities; however, little is known about the volatile compounds present in this plant. Here, a novel solid-phase microextraction (SPME) Arrow method was performed to extract and analyze volatile compounds from freeze-dried Cirsium setidens Nakai. Four types of SPME Arrows coated with films, such as carbon wide range/polydimethylsiloxane, divinylbenzene/polydimethylsiloxane, polydimethyls

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42

Liu, Hsing-Jang, Waiseng Martin Feng, Jeung Bea Kim, and Eric N. C. Browne. "Lewis acid catalyzed Diels–Alder reactions of two useful dienyl phosphate esters." Canadian Journal of Chemistry 72, no. 10 (1994): 2163–75. http://dx.doi.org/10.1139/v94-275.

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The Lewis acid catalyzed Diels–Alder reactions of dienyl phosphate esters 1 and 2 were examined. 2-Diethylphosphoryloxy-1,3-butadiene (1) was found to react with a variety of α,β-unsaturated carbonyl compounds under Lewis acid catalysis with excellent regioselectivity to give synthetically useful cyclohexene derivatives. The adducts were produced in accordance with the normal rules governing the Diels–Alder addition. In the presence of stannic chloride acyclic α,β-unsaturated ketones such as ethyl vinyl ketone and methyl vinyl ketone reacted rapidly with diene phosphate 1 to give exclusively t

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43

Scott, J. W., and E. A. Baldwin. "Flavor Analysis of rin/+ and Other Tomato hybrids and Inbreds Using Sensory and Chemical Methods." HortScience 33, no. 3 (1998): 471e—472. http://dx.doi.org/10.21273/hortsci.33.3.471e.

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Consumer dissatisfaction with commercial tomato (Lycopersicon esculentum Mill.) eating quality is well-known. An array of tomato cultivars were tested for overall flavor by experienced or trained taste panels over several seasons. Fruit were also analyzed for aromatic volatiles, soluble solids (SS), and titratable acidity (TA). `Solar Set' was the most consistent cultivar for overall flavor, always ranking in the most preferred statistical group. Cultivars that were bred for increased firmness, either by crossing firm lines (ultrafirms) or that were heterozygous for the ripening inhibitor (rin

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44

Kreiter, Cornelius G., та Wolfgang Conrad. "Gehinderte Ligandbewegungen in Übergangsmetallkomplexen, XLIV [1]: Photoreaktionen von Hexacarbonyl-μ-η5:5-fulvalen-dimolybdän mit Allen / Hindered Ligand Movements in Transition Metal Complexes, XLIV [1]: Photoreactions of Hexacarbonyl-μ-η5:5 -fulvalene-dimolybdenum with Allene". Zeitschrift für Naturforschung B 49, № 12 (1994): 1707–16. http://dx.doi.org/10.1515/znb-1994-1215.

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Hexacarbonyl-μ-η5:5-fulvalene-dimolybdenum (1) reacts photochemically with allene to η2-allene-pentacarbonyl-μ-η5:5-fulvalene-dimolybdenum (2), μ-η2:2-allene-tetracarbonyl- μ-η5:5-fulvalene-dimolybdenum (4), and dicarbonyl-μ-η5:5-fulvalene-μ-η1:2:3-2-methylene- 4-penten-1,4-diyl-dimolybdenum (5). Complex 2 rearranges readily at room temperature to pentacarbonyl-μ-η1:3-2-propen-1,2-diyl-μ-η5:5-fulvalene-dimolybdenum (3). Upon UV irradiation 4 yields with an excess of allene μ-η2:2-Allene-pentacarbonyl-μ-η5:5-fulvalene-dimolyb-denum (2) shows a hindered rotation of the allene ligand with an ener

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45

Canoles, Mauricio, Marisol Soto, and Randolph Beaudry. "Hydroperoxide Lyase Activity Necessary for Normal Aroma Volatile Biosynthesis of Tomato Fruit, Impacting Sensory Perception and Preference." HortScience 40, no. 4 (2005): 1130E—1131. http://dx.doi.org/10.21273/hortsci.40.4.1130e.

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The aldehydes cis-3-hexenal, hexanal, and trans-2-hexenal; the alcohols 1-hexanol, and cis-3-hexenol; and the ketone 1-penten-3-one are produced as a consequence of lipid degradation following tissue disruption and are among the most important volatile compounds in tomato (Lycopersicon esculentum Mill.) aroma. The biosynthesis of cis-3-hexenal and other volatiles noted involves the action of a sequence of enzymes including lipase, lipoxygenase (LOX), hydroperoxide lyase (HPL), isomerase, and alcohol dehydrogenase (ADH) on glycerolipids containing the fatty acids, linoleic acid (18:2) and linol

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46

He, Gong Xiu, Dang Quan Zhang, and Lin Lin Guo. "High-Grade Utilization of Recovering Wastewater from Cinnamomum Camphora Oil." Key Engineering Materials 480-481 (June 2011): 272–77. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.272.

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The production of noble Cinnamomum camphora oil from C. camphora leaves and twigs brings a mass of extracting wastewater which is pollutive to water environment. In order to better utilize and recover the productive wastewater from the Eucalyptus oil, we used GC/MS to analyze the possible top value-added components of benzene/ethanol extractives of leaves and twigs of C.camphora. The analytical result showed that only 15 compounds were identified from the benzene/ethanol extractive of C. camphora trigs, and 29 compounds from 30 peaks were identified from the benzene/ethanol extractive of C. ca

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47

Baldwin, E. A., J. W. Scott, M. A. Einstein, et al. "Relationship between Sensory and Instrumental Analysis for Tomato Flavor." Journal of the American Society for Horticultural Science 123, no. 5 (1998): 906–15. http://dx.doi.org/10.21273/jashs.123.5.906.

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The major components of flavor in tomato (Lycopersicon esculentum Mill.) and other fruit are thought to be sugars, acids, and flavor volatiles. Tomato overall acceptability, tomato-like flavor, sweetness, and sourness for six to nine tomato cultivars were analyzed by experienced panels using a nine-point scale and by trained descriptive analysis panels using a 15-cm line scale for sweetness, sourness, three to five aroma and three to seven taste descriptors in three seasons. Relationships between sensory data and instrumental analyses, including flavor volatiles, soluble solids (SS), individua

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48

Wang, Yin-Tung, and Tsung-Yao Hsu. "Flowering and Growth of Phalaenopsis Orchids following Growth Retardant Applications." HortScience 29, no. 4 (1994): 285–88. http://dx.doi.org/10.21273/hortsci.29.4.285.

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Bare-root, mature, hybrid Phalaenopsis seedlings were dipped in one of three growth retardant solutions for 5 seconds or sprayed with a growth retardant 4 weeks following planting during inflorescence elongation. Dipping the entire plant in daminozide (2500, 5000, or 7500 mg·liter-1) before planting delayed flowering by 5-13 days, whereas foliar applications had no effect. Paclobutrazol (50, 100, 200, or 400 mg·liter-1) or uniconazole (25, 50, 100, or 200 mg·liter-1) dips did not affect the bloom date but effectively restricted inflorescence growth below the first flower (stalk). Increasing co

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49

Meucci, Annalisa, Anton Shiriaev, Irene Rosellini, Fernando Malorgio, and Beatrice Pezzarossa. "Se-Enrichment Pattern, Composition, and Aroma Profile of Ripe Tomatoes after Sodium Selenate Foliar Spraying Performed at Different Plant Developmental Stages." Plants 10, no. 6 (2021): 1050. http://dx.doi.org/10.3390/plants10061050.

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Foliar spray with selenium salts can be used to fortify tomatoes, but the results vary in relation to the Se concentration and the plant developmental stage. The effects of foliar spraying with sodium selenate at concentrations of 0, 1, and 1.5 mg Se L−1 at flowering and fruit immature green stage on Se accumulation and quality traits of tomatoes at ripening were investigated. Selenium accumulated up to 0.95 µg 100 g FW−1, with no significant difference between the two concentrations used in fruit of the first truss. The treatment performed at the flowering stage resulted in a higher selenium

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Kil, Jin-Sang, Young Son, Yong-Kwan Cheong, et al. "Okanin, a chalcone found in the genus Bidens, and 3-penten-2-one inhibit inducible nitric oxide synthase expression via heme oxygenase-1 induction in RAW264.7 macrophages activated with lipopolysaccharide." Journal of Clinical Biochemistry and Nutrition 50, no. 1 (2011): 53–58. http://dx.doi.org/10.3164/jcbn.11-30.

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