scholarly journals MASS SPECTROMETRIC STUDIES OF THE COMPOSITION OF VOLATILE ORGANIC COMPOUNDS RELEASED BY VARIOUS FUNGAL SPECIES OF GENUS LECANICILLIUM

2021 ◽  
Vol 31 (4) ◽  
pp. 71-78
Author(s):  
A. G. Kuzmin ◽  
Keyword(s):  
Acetic Acid ◽  
Volatile Organic Compounds ◽  
Gas Phase ◽  
Organic Compounds ◽  
Plant Protection ◽  
Fungal Species ◽  
Quadrupole Mass ◽  
Volatile Organic ◽  
First Time ◽  
Chemical Pesticides

For the first time, the quantitative and qualitative composition of volatile organic compounds (VOCs), released by strains of various species of entomopathogenic fungi (EF) of the genus Lecanicillium, was studied using a quadrupole mass spectrometer. Lecanicillium fungi are used as an alternative to chemical pesticides for plant protection. The main detected components of the gas phase over the EF mycelium on the 10th day of growing on the agar Czapek's medium were carbon dioxide (5–20%), oxygen (0.1–15%), acetone (0.2–12 ppm), pentane (up to 0.5 ppm), acetic acid (up to 0.15 ppm). Acetone and pentane were found in the VOCs of all studied strains, acetic acid — in 5 strains belonging to different species, in other strains it appeared after a longer period of time, or was absent completely. Among the VOCs of some strains, substances such as hexyl acetate, sulfur dioxide were found in small quantities. These substances may be responsible for the pathogenic and repellent properties of the studied fungi with respect to phytophages.

The rate of photocatalytic oxidation of aromatic volatile organic compounds in the gas-phase

2008 ◽  
Vol 42 (34) ◽  
pp. 7844-7850 ◽  
Author(s):  
Aikaterini K. Boulamanti ◽  
Christos A. Korologos ◽  
Constantine J. Philippopoulos
Keyword(s):  
Volatile Organic Compounds ◽  
Gas Phase ◽  
Organic Compounds ◽  
Photocatalytic Oxidation ◽  
Volatile Organic

scholarly journals Exposure Studies of Different Kinds of Volatile Organic Compounds in Vapour Phase with a Narrow-gap Cell Containing CuxS Modified Carbon Microdisc Electrode

2018 ◽  
Vol 63 (1) ◽  
pp. 170-178 ◽  
Author(s):  
László Kiss
Keyword(s):  
Acetic Acid ◽  
Volatile Organic Compounds ◽  
Ethyl Acetate ◽  
Organic Compounds ◽  
Modified Electrode ◽  
Vapour Phase ◽  
Narrow Gap ◽  
Current Increase ◽  
Interelectrode Gap ◽  
Volatile Organic

In this article, the feasibility of the CuxS modified carbon microdisc electrode was examined by exposure to four different volatile organic compounds (2-propanol, acetic acid, ethyl acetate and n-butylamine) directly in their vapour phase using cyclic voltammetry and amperometry. The performance of the modified microdisc was compared with the bare carbon microdisc (30 μm in diameter) which was involved in a narrow-gap cell. By using both methods high current increase was observed for 2-propanol with the modified electrode and its sensitivity was sufficiently higher than with the bare electrode. The modified electrode showed lower current signals in case of acetic acid and n-butylamine. The latter formed a condensation layer at the interelectrode gap. Neither the bare nor the modified electrode was sensitive to ethyl acetate.

Optimisation of secondary electrospray ionisation (SESI) for the trace determination of gas-phase volatile organic compounds

The Analyst ◽  
2010 ◽  
Vol 135 (2) ◽  
pp. 306 ◽  
Author(s):  
Leonard A. Dillon ◽  
Victoria N. Stone ◽  
Laura A. Croasdell ◽  
Peter R. Fielden ◽  
Nicholas J. Goddard ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Gas Phase ◽  
Organic Compounds ◽  
Trace Determination ◽  
Electrospray Ionisation ◽  
Volatile Organic

scholarly journals Aerosol mass yields of selected biogenic volatile organic compounds – a theoretical study with nearly explicit gas-phase chemistry

2019 ◽  
Vol 19 (22) ◽  
pp. 13741-13758
Author(s):  
Carlton Xavier ◽  
Anton Rusanen ◽  
Putian Zhou ◽  
Chen Dean ◽  
Lukas Pichelstorfer ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Gas Phase ◽  
Organic Compounds ◽  
Chemical Mechanism ◽  
Biogenic Volatile Organic Compounds ◽  
Gas Phase Chemistry ◽  
Mass Load ◽  
Volatile Organic ◽  
Phase Chemistry ◽  
Good Agreement

Abstract. In this study we modeled secondary organic aerosol (SOA) mass loadings from the oxidation (by O3, OH and NO3) of five representative biogenic volatile organic compounds (BVOCs): isoprene, endocyclic bond-containing monoterpenes (α-pinene and limonene), exocyclic double-bond compound (β-pinene) and a sesquiterpene (β-caryophyllene). The simulations were designed to replicate an idealized smog chamber and oxidative flow reactors (OFRs). The Master Chemical Mechanism (MCM) together with the peroxy radical autoxidation mechanism (PRAM) were used to simulate the gas-phase chemistry. The aim of this study was to compare the potency of MCM and MCM + PRAM in predicting SOA formation. SOA yields were in good agreement with experimental values for chamber simulations when MCM + PRAM was applied, while a stand-alone MCM underpredicted the SOA yields. Compared to experimental yields, the OFR simulations using MCM + PRAM yields were in good agreement for BVOCs oxidized by both O3 and OH. On the other hand, a stand-alone MCM underpredicted the SOA mass yields. SOA yields increased with decreasing temperatures and NO concentrations and vice versa. This highlights the limitations posed when using fixed SOA yields in a majority of global and regional models. Few compounds that play a crucial role (>95 % of mass load) in contributing to SOA mass increase (using MCM + PRAM) are identified. The results further emphasized that incorporating PRAM in conjunction with MCM does improve SOA mass yield estimation.

A rationally designed vapoluminescent compound with adsorptive channels and responsive luminophores for volatile organic compounds (VOCs)

2019 ◽  
Vol 48 (4) ◽  
pp. 1179-1183 ◽  
Author(s):  
Mingxue Yang ◽  
Xiao-Ning Li ◽  
Ji-Hui Jia ◽  
Xu-Lin Chen ◽  
Can-Zhong Lu
Keyword(s):  
Volatile Organic Compounds ◽  
Solvent Effect ◽  
Organic Compounds ◽  
Organic Molecules ◽  
Volatile Organic ◽  
First Time

We designed a sensor compound which for the first time combines the solvent effect of ICT organic molecules with large channels adsorbing VOCs.

scholarly journals Importance of biogenic volatile organic compounds to acyl peroxy nitrates (APN) production in the southeastern US during SOAS 2013

2019 ◽  
Vol 19 (3) ◽  
pp. 1867-1880 ◽  
Author(s):  
Shino Toma ◽  
Steve Bertman ◽  
Christopher Groff ◽  
Fulizi Xiong ◽  
Paul B. Shepson ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Gas Phase ◽  
Organic Compounds ◽  
Model Simulation ◽  
Statistical Correlation ◽  
Organic Nitrates ◽  
Biogenic Volatile Organic Compounds ◽  
The North ◽  
Southeastern Us ◽  
Volatile Organic

Abstract. Gas-phase atmospheric concentrations of peroxyacetyl nitrate (PAN), peroxypropionyl nitrate (PPN), and peroxymethacryloyl nitrate (MPAN) were measured on the ground using a gas chromatograph electron capture detector (GC-ECD) during the Southern Oxidants and Aerosols Study (SOAS) 2013 campaign (1 June to 15 July 2013) in Centreville, Alabama, in order to study biosphere–atmosphere interactions. Average levels of PAN, PPN, and MPAN were 169, 5, and 9 pptv, respectively, and the sum accounts for an average of 16 % of NOy during the daytime (10:00 to 16:00 local time). Higher concentrations were seen on average in air that came to the site from the urban NOx sources to the north. PAN levels were the lowest observed in ground measurements over the past two decades in the southeastern US. A multiple regression analysis indicates that biogenic volatile organic compounds (VOCs) account for 66 % of PAN formation during this study. Comparison of this value with a 0-D model simulation of peroxyacetyl radical production indicates that at least 50 % of PAN formation is due to isoprene oxidation. MPAN has a statistical correlation with isoprene hydroxynitrates (IN). Organic aerosol mass increases with gas-phase MPAN and IN concentrations, but the mass of organic nitrates in particles is largely unrelated to MPAN.

scholarly journals Fast and selective detection of volatile organic compounds using a novel pseudo spin-ladder compound CaCu2O3

2020 ◽  
Vol 1 (7) ◽  
pp. 2368-2379
Author(s):  
N. Lavanya ◽  
G. Veerapandi ◽  
S. G. Leonardi ◽  
N. Donato ◽  
G. Neri ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Volatile Organic Compounds ◽  
Gas Sensor ◽  
Organic Compounds ◽  
Spin Ladder ◽  
Selective Detection ◽  
Volatile Organic ◽  
First Time

A novel pseudo spin-ladder CaCu2O3 compound (2-leg) based conductometric gas sensor has been proposed, for the first time, for the detection of volatile organic compounds (VOCs); (a) the proposed reaction mechanism in air, and (b) in the presence of acetone and ethanol.

scholarly journals Plant Growth Regulators Improve the Production of Volatile Organic Compounds in Two Rose Varieties

Plants ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 35 ◽  
Author(s):  
Mohammed Ibrahim ◽  
Manjree Agarwal ◽  
Jeong Oh Yang ◽  
Muslim Abdulhussein ◽  
Xin Du ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Volatile Organic Compounds ◽  
Plant Growth ◽  
Plant Growth Regulators ◽  
Organic Compounds ◽  
Growth Regulators ◽  
Naphthalene Acetic Acid ◽  
Flame Ionization ◽  
Three Phase ◽  
Volatile Organic

The study focused on the influence of the plant growth regulators (PGRs) benzyladenine (BA) and naphthalene acetic acid (NAA) on the production of volatile organic compounds (VOCs) from the flowers of two modern rose varieties, Hybrid Tea and Floribunda. Thirty-six plants of Hybrid Tea and Floribunda were tested. Benzyladenine and naphthalene acetic acid were applied at 0, 100 and 200 mg/L to both rose varieties. Gas chromatography, coupled with flame ionization detection and mass spectrometry, was used to analyze and identify the volatile organic compounds from the flowers. A three-phase fiber 50/30 µm divinylbenzene/carboxen/polydimethylsiloxane was used to capture VOCs, at 2, 4 and 8 weeks, and 4 weeks was selected as it had the highest peak area. In total, 81 and 76 VOCs were detected after treatment of both rose varieties with BA and NAA, respectively. In addition, 20 compounds, which had significant differences between different treatments, were identified from both rose varieties. The majority of VOCs were extracted after the application of 200 mg (BA and NAA) /L of formulation, and four important compounds, cis-muurola-4(141)5-diene, y-candinene, y-muurolene and prenyl acetate, increased significantly compared to the controls. These compounds are commercially important aroma chemicals. This study used the rapid and solvent-free SPME method to show that BA and NAA treatments can result in significant VOC production in the flowers of two rose varieties, enhancing the aromatic value of the flowers. This method has the potential to be applied to other valuable aromatic floricultural plant species.

Sign in / Sign up

Export Citation Format

Share Document