beta-ionone and 2-isobutyl-3-methoxypyrazine

beta-ionone has been researched along with 2-isobutyl-3-methoxypyrazine* in 2 studies

Other Studies

2 other study(ies) available for beta-ionone and 2-isobutyl-3-methoxypyrazine

ArticleYear
A systematic study on spatial and seasonal patterns of eight taste and odor compounds with relation to various biotic and abiotic parameters in Gonghu Bay of Lake Taihu, China.
    The Science of the total environment, 2010, Dec-15, Volume: 409, Issue:2

    A systematic study was conducted on seasonal and spatial patterns of taste and odor (T&O) compounds with relation to biotic and abiotic parameters at fifteen sites in Gonghu Bay of Lake Taihu in 2008. We developed a sensitive and automated method to simultaneously analyze eight T&O compounds (boiling points ranging from 38°C to 239°C) by using Purge-and-Trap (P&T) coupled with GC/MS. Maximum particulate dimethyl trisulfide (DMTS, 69.6 ng/L) exceeded its odor threshold concentrations (OTC, 10 ng/L) and maximum dissolved DMTS was 6.1 ng/L, but still far below concentration in the drinking water pollution incident of Wuxi City in 2007 when DMTS reached 1768-11,399 ng/L. Geosmin (GEO), 2-methylisoborneol (MIB), β-cyclocitral, β-ionone and 2-isobutyl-3-methoxypyrazine (IBMP) occasionally or frequently exceeded their OTCs, whereas 2-isopropyl-3-methoxypyrazine (IPMP) and dimethyl sulfide (DMS) did not. We found for the first time significant correlations between particulate β-cyclocitral and β-ionon concentrations and intracellular and extracellular microcystin concentrations. Spatially, Nanquan Waterworks faced more risk by T&O contamination than Xidong Waterworks. High concentrations of NO(3)-N, TDN and TN could be risky signs of taste and odor events by DMS, DMTS, IPMP, IBMP and GEO.

    Topics: Aldehydes; Camphanes; China; Diterpenes; Environmental Monitoring; Fresh Water; Microcystins; Naphthols; Norisoprenoids; Odorants; Phytoplankton; Pyrazines; Seasons; Sulfides; Taste; Water Pollutants, Chemical; Water Supply

2010
Occurrence of dissolved and particle-bound taste and odor compounds in Swiss lake waters.
    Water research, 2009, Volume: 43, Issue:8

    The occurrence of algal taste and odor (T&O) compounds was investigated in three Swiss lakes which exhibit different nutrient levels from eutrophic to oligotrophic (Lake Greifensee, Lake Zurich and Lake Lucerne). Apart from dissolved T&O compounds, the study also encompassed particle-bound compounds, i.e., compounds that can be released from damaged algal cells during drinking water treatment. A combined instrumental (SPME-GC-MS) and sensory method was applied that allowed to detect and quantify T&O compounds in natural waters in the sub ppt to low ppt-range. In addition to the prominent T&O compounds geosmin and 2-methyl-isoborneol (MIB), four other T&O compounds could be detected in the lake waters, though all at relatively low concentrations (maximum concentrations of geosmin 19 ng L(-1), MIB 3 ng L(-1), beta-ionone 27 ng L(-1), beta-cyclocitral 7 ng L(-1), 2-isobutyl-3-methoxypyrazine 2 ng L(-1), 2-isopropyl-3-methoxypyrazine 16 ng L(-1)). The concentration peaks typically occurred in the epilimnion during summer concurrent with a high phytoplankton biomass. Consistently, the concentration levels for most of the compounds varied substantially between the three lakes and generally decreased in the order eutrophic Lake Greifensee>mesotrophic Lake Zurich>oligotrophic Lake Lucerne. Furthermore, our data revealed that the occurrence of beta-ionone was largely influenced by Planktothrix rubescens. This is the first time that a correlation between beta-ionone and this cyanobacterium has been reported for natural waters.

    Topics: Camphanes; Fresh Water; Gas Chromatography-Mass Spectrometry; Naphthols; Norisoprenoids; Odorants; Organic Chemicals; Particulate Matter; Phytoplankton; Pyrazines; Reproducibility of Results; Solubility; Switzerland; Taste

2009