Components contributing to beef flavor. Volatile compounds produced by the reaction of 4-hydroxy-5-methyl-3(2H)-furanone and its thio analog with hydrogen sulfide

1975 ◽  
Vol 23 (3) ◽  
pp. 501-505 ◽  
Author(s):  
Godefridus A. M. Van den Ouweland ◽  
Henricus G. Peer
Keyword(s):  
Hydrogen Sulfide ◽  
Volatile Compounds ◽  
Beef Flavor ◽  
Thio Analog

Characterization of New Volatile Compounds in the Neutral Fraction of Roasted Beef Flavor

1982 ◽  
Vol 47 (6) ◽  
pp. 2068-2069 ◽  
Author(s):  
CHEN-MING HSU ◽  
ROBERT J. PETERSON ◽  
QI ZHANG JIN ◽  
CHI-TANG HO ◽  
STEPHEN S. CHANG
Keyword(s):  
Volatile Compounds ◽  
Neutral Fraction ◽  
Beef Flavor

scholarly journals IDENTIFICATION OFVOLATILE COMPOUNDS RESPONSIBLE FOR OFF-ODORS PRODUCED BY BROCCOLI STORED IN ANAEROBIC CONDITIONS

HortScience ◽  
1991 ◽  
Vol 26 (6) ◽  
pp. 700G-701
Author(s):  
Charles F. Forney ◽  
James P. Mattheis ◽  
Rodney K. Austin
Keyword(s):  
Gas Chromatography ◽  
Hydrogen Sulfide ◽  
Ethyl Acetate ◽  
Volatile Compounds ◽  
Brassica Oleracea ◽  
Oxygen Concentration ◽  
Dimethyl Disulfide ◽  
Modified Atmosphere ◽  
Anaerobic Conditions ◽  
Primary Compound

Broccoli (Brassica oleracea L., ltalica Group) produces severe off-odors when it is stored under anaerobic conditions which can develop in modified atmosphere packages. The compounds responsible for these off-odors, which render the broccoli unmarketable, were produced after sealing 50 g of fresh broccoli florets in glass pint jars held at 15C. Twenty-four hours after sealing oxygen concentration dropped to around 0.5% and remained at this concentration for 6 days. Volatile compounds found in the head space of the jars were identified using gas chromatography with flame photometric and mass spectroscopic detection. Volatile compounds produced were identified as methanethiol, hydrogen sulfide, dimethyl disulfide, acetaldehyde, acetone, ethanol, and ethyl acetate. Methanethiol was detected 48 hours after sealing and appears through olfactory evaluation to be the primary compound responsible for the objectionable odor.

Odorous Compounds in Wastewater Reservoir Used for Irrigation

1999 ◽  
Vol 40 (6) ◽  
pp. 65-71 ◽  
Author(s):  
B. Ginzburg ◽  
I. Dor ◽  
O. Lev
Keyword(s):  
Gas Chromatography ◽  
Hydrogen Sulfide ◽  
Volatile Compounds ◽  
Organic Nitrogen ◽  
Late Summer ◽  
Physicochemical Characteristics ◽  
Reservoir Water ◽  
Volatile Organic ◽  
Odorous Compounds ◽  
Chromatographic Fingerprinting

The objective of this study was to investigate the odor and physicochemical characteristics of a model deep wastewater reservoir (the Na'an reservoir). Depth sampling of the reservoir revealed depletion of oxygen and increase of hydrogen sulfide and organic nitrogen and sulfur odorous compounds at deeper levels of the reservoir. TOC, TON, BOD5 and chromatographic fingerprinting by MSD and Olfactory/GC of the semi-volatile organic compounds in the reservoir were found to be season dependent. Late summer was found to be the most odorous period and the richest in semi-volatile compounds. A list of volatile compounds, which were identified by gas chromatography, in the reservoir water and in the surrounding atmosphere was compiled.

Endogenous hydrogen sulfide sulfhydrates IKKβ at cysteine 179 to control pulmonary artery endothelial cell inflammation

2019 ◽  
Vol 133 (20) ◽  
pp. 2045-2059 ◽  
Author(s):  
Da Zhang ◽  
Xiuli Wang ◽  
Siyao Chen ◽  
Selena Chen ◽  
Wen Yu ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Endothelial Cell ◽  
Pulmonary Artery ◽  
Cell Model ◽  
Site Directed Mutagenesis ◽  
Critical Event ◽  
Hypertensive Rats ◽  
Pulmonary Artery Endothelial Cell

Abstract Background: Pulmonary artery endothelial cell (PAEC) inflammation is a critical event in the development of pulmonary arterial hypertension (PAH). However, the pathogenesis of PAEC inflammation remains unclear. Methods: Purified recombinant human inhibitor of κB kinase subunit β (IKKβ) protein, human PAECs and monocrotaline-induced pulmonary hypertensive rats were employed in the study. Site-directed mutagenesis, gene knockdown or overexpression were conducted to manipulate the expression or activity of a target protein. Results: We showed that hydrogen sulfide (H2S) inhibited IKKβ activation in the cell model of human PAEC inflammation induced by monocrotaline pyrrole-stimulation or knockdown of cystathionine γ-lyase (CSE), an H2S generating enzyme. Mechanistically, H2S was proved to inhibit IKKβ activity directly via sulfhydrating IKKβ at cysteinyl residue 179 (C179) in purified recombinant IKKβ protein in vitro, whereas thiol reductant dithiothreitol (DTT) reversed H2S-induced IKKβ inactivation. Furthermore, to demonstrate the significance of IKKβ sulfhydration by H2S in the development of PAEC inflammation, we mutated C179 to serine (C179S) in IKKβ. In purified IKKβ protein, C179S mutation of IKKβ abolished H2S-induced IKKβ sulfhydration and the subsequent IKKβ inactivation. In human PAECs, C179S mutation of IKKβ blocked H2S-inhibited IKKβ activation and PAEC inflammatory response. In pulmonary hypertensive rats, C179S mutation of IKKβ abolished the inhibitory effect of H2S on IKKβ activation and pulmonary vascular inflammation and remodeling. Conclusion: Collectively, our in vivo and in vitro findings demonstrated, for the first time, that endogenous H2S directly inactivated IKKβ via sulfhydrating IKKβ at Cys179 to inhibit nuclear factor-κB (NF-κB) pathway activation and thereby control PAEC inflammation in PAH.

Limnological characteristics, community metabolism and management strategies of a coastal sinkhole in Cuba (Cenote Jennifer)

2020 ◽  
Vol 56 ◽  
pp. 24
Author(s):  
Roberto González-De Zayas ◽  
Liosban Lantigua Ponce de León ◽  
Liezel Guerra Rodríguez ◽  
Felipe Matos Pupo ◽  
Leslie Hernández-Fernández
Keyword(s):  
Hydrogen Sulfide ◽  
Primary Productivity ◽  
Major Ions ◽  
Saline Water ◽  
Management Strategies ◽  
Tourist Destination ◽  
Community Metabolism ◽  
Morphological Studies ◽  
Made In ◽  
Limnological Parameters

The Cenote Jennifer is an important and unique aquatic sinkhole in Cayo Coco (Jardines del Rey Tourist Destination) that has brackish to saline water. Two samplings were made in 1998 and 2009, and 4 metabolism community experiments in 2009. Some limnological parameters were measured in both samplings (temperature, salinity, pH, dissolved oxygen major ions, hydrogen sulfide, nutrients and others). Community metabolism was measured through incubated oxygen concentration in clear and dark oxygen bottles. Results showed that the sinkhole limnology depends on rainfall and light incidence year, with some stratification episodes, due to halocline or oxycline presence, rather than thermocline. The sinkhole water was oligotrophic (total nitrogen of 41.5 ± 22.2 μmol l−1 and total phosphorus of 0.3 ± 0.2 μmol l−1) and with low productivity (gross primary productivity of 63.0 mg C m−2 d−1). Anoxia and hypoxia were present at the bottom with higher levels of hydrogen sulfide, lower pH and restricted influence of the adjacent sea (2 km away). To protect the Cenote Jennifer, tourist exploitation should be avoided and more resources to ecological and morphological studies should be allocated, and eventually use this aquatic system only for specialized diving. For conservation purposes, illegal garbage disposal in the surrounding forest should end.

Antioxidant profile and HS-SPME/GC-MS-TOF analysis of volatile compounds of Alnus acuminata Ssp. Arguta bark

Planta Medica ◽  
2015 ◽  
Vol 81 (11) ◽  
Author(s):  
MI Aguilar ◽  
JF Rivero-Cruz ◽  
G Duarte-Lisci ◽  
C Alvarado-López
Keyword(s):  
Volatile Compounds ◽  
Antioxidant Profile ◽  
Alnus Acuminata

Anti-biofilm potential of some plant volatile compounds against Proteus mirabilis

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
JAA do Nascimento Júnior ◽  
BS dos Santos ◽  
LCA de Araújo ◽  
AVA Lima ◽  
TD da Silva ◽  
...  
Keyword(s):  
Volatile Compounds ◽  
Proteus Mirabilis ◽  
Plant Volatile ◽  
Plant Volatile Compounds
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