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2-methylisoborneol, etc ; biosynthesis; stereochemistry; stereoselectivity; Show all 4 Subjects
Abstract:
... The biosynthesis of 2-methylisoborneol was reconstituted by elongation of dimethylallyl diphosphate (DMAPP) with (S)- and (R)-2-methylisopentenyl diphosphate (2-Me-IPP) using farnesyl diphosphate synthase (FPPS), followed by terpene cyclisation. The stereochemical course of the FPPS reaction was studied in detail using stereoselectively deuterated 2-Me-IPP isotopomers. ...
2-methylisoborneol, etc ; Dolichospermum; Pseudanabaena; gene expression; genes; geosmin; odors; pollution; research; taste; temperature; Show all 11 Subjects
Abstract:
... Cyanobacterial blooms accompanied by taste and odor (T&O) compounds affect the recreational function and safe use of drinking water. Geosmin and 2-methylisoborneol (2-MIB) are the most common T&O compounds. In this study, we investigated the effect of temperature on geosmin and 2-MIB production in Dolichospermum smithii and Pseudanabaena foetida var. intermedia. More specifically, transcription of ...
2-methylisoborneol, etc ; Cyanobacteria; benthic organisms; biofilm; cylindrospermopsin; geosmin; microcystins; odors; risk; saxitoxins; secondary metabolites; taste; Show all 12 Subjects
Abstract:
... Although there is growing evidence that benthic cyanobacteria represent a significant source of toxins and taste and odour (T&O) compounds in water bodies globally, water utilities rarely monitor for them. Benthic cyanobacteria grow in an array of matrices such as sediments, biofilms, and floating mats, and they can detach and colonize treatment plants. The occurrence of compounds produced by bent ...
2-methylisoborneol, etc ; Cyanobacteria; cell viability; coagulation; disinfection; filtration; odors; oxidation; sand; water supply; water treatment; Show all 11 Subjects
Abstract:
... The increasing frequency and intensity of taste- and odour-producing cyanobacteria in water sources is a growing global issue. Odour events caused by 2-methylisoborneol (2-MIB) mainly arising from filamentous cyanobacteria have been a very common problem in water supply. Removal rates of filamentous cyanobacteria and 2-MIB by conventional water treatment, such as coagulation, and disinfection trea ...
2-methylisoborneol, etc ; Oncorhynchus mykiss; fish; fish production; geosmin; health promotion; lipid content; lipophilicity; nutritive value; off flavors; Show all 10 Subjects
Abstract:
... Recirculating aquaculture systems (RAS)s have become important in land-based fish production. Unfortunately, RAS-farmed fish accumulate off-flavors in their flesh. Off-flavor compounds geosmin (GSM) and 2-methylisoborneol (MIB) are lipophilic compounds and their concentrations need to be controlled in RAS. Therefore, a useful area of study would be the expected impact of total lipid contents and f ...
2-methylisoborneol, etc ; Cyanobacteria; consumer preferences; fish; fish production; geosmin; metabolites; off flavors; organic matter; phosphorus; phytoplankton; smell; toxicity; Show all 13 Subjects
Abstract:
... Off-flavors in fish and water are considered a worldwide problem. Several factors, such as the presence of phosphorus, micronutrients, and organic matter, contribute to phytoplankton proliferation and the production of off-flavors. Geosmin and 2-methylisoborneol are the most common off-flavors that confer the smell of earth or mold to water and fish. These metabolites are not considered toxic, but ...
... Submerged-membrane hybrid systems (SMHSs) that combine membrane filtration with powdered activated carbon (PAC) take advantage of PAC's ability to adsorb and remove contaminants dissolved in water. However, the risk of contaminant desorption due to temporal changes in the influent concentration of the contaminant has not been thoroughly explored. In this study, we used a SMHS with conventionally-s ...
2-methylisoborneol, etc ; Aphanizomenon; biomass; hydrometeorology; odors; phytoplankton; rain; spring; surface water temperature; water reservoirs; water utilities; wet season; China; Show all 13 Subjects
Abstract:
... Occurrences of odor compounds in drinking water reservoirs are considered as a nuisance by the water industry. Through the high-frequency monitoring of Tianmuhu Reservoir, a drinking water source for a city with a population of 700,000, we found that odor compounds seasonal dynamics were significantly related to phytoplankton succession, which was controlled by hydrometeorological process. 2-Methy ...
... Cyanobacteria release 2-methylisoborneol (MIB) as a secondary metabolite. Here, we propose a reverse transcription quantitative real-time PCR (RT-qPCR) based method to evaluate the MIB-producing potential in source water by detecting the MIB-synthesis gene (mic). A MIBQSF/R primer set was designed based on 35 mic gene sequences obtained from 12 pure-cultured MIB-producing strains and 23 sequences ...
2-methylisoborneol, etc ; Chlorophyta; Cryptomonas; Cyanobacteria; autumn; biomass; geosmin; iron; manganese; microcystins; overwintering; plankton; secondary metabolites; sediments; spring; water quality; winter; China; Show all 18 Subjects
Abstract:
... Overwintering benthic algae not only directly impact drinking water safety, but also affect the algae recruitment in warm spring seasons. Thus, understanding the characteristics of overwintering benthic algae can provide scientific references for formulating preventative strategies of reasonable water resource. However, they have received less attention. In this study, the spatiotemporal variation ...
2-methylisoborneol, etc ; Oncorhynchus mykiss; consumer acceptance; depuration; farmed fish; gas chromatography; geosmin; mass spectrometry; muscle tissues; muscles; off flavors; pollution; research; toxicity; Show all 14 Subjects
Abstract:
... In recirculating aquaculture systems (RAS), off-flavors that accumulate in fish muscle tissue can be problematic in terms of consumer acceptance and the reputation of farmed fish products. Although off-flavors are not toxic at low concentrations, they often give fish muscle earthy, muddy, or other unwanted flavors. Traditionally, muddy off-flavors caused by geosmin (GSM) and 2-methylisoborneol (MI ...
2-methylisoborneol, etc ; chlorine; dynamic models; geosmin; odors; oxidation; surface water; Show all 7 Subjects
Abstract:
... Geosmin (GSM) and 2-methylisoborneol (2-MIB) are representative musty/earthy odor compounds commonly present in surface water. In present study, the degradation of GSM and 2-MIB subject to different UV-based advanced oxidation processes (AOPs), including UV/H₂O₂, UV/S₂O₈²⁻, UV/chlorine, and UV/chloramine, in a phosphate-buffered saline (PBS) was conducted in a photoreactor with reflective inner su ...
2-methylisoborneol, etc ; Pseudanabaena; genes; microbiology; odors; phylogeny; rivers; South Korea; Show all 8 Subjects
Abstract:
... We investigated the abundance of Pseudanabaena species and the concentration of the monoterpene 2‐methylisoborneol (2‐MIB) from July to October at three sampling sites in South Korea. To identify the main cause of 2‐MIB occurrence in drinking water source, we characterized and performed a phylogenetic analysis of the 2‐MIB synthase gene. Pseudanabaena was the dominant cyanobacterium (68%–100%) amo ...
2-methylisoborneol, etc ; Aphanizomenon; latitude; light intensity; photons; research; water; water temperature; Show all 8 Subjects
Abstract:
... In comparison with the middle- and high-latitude regions, the low-latitude regions are less associated with the occurrence of 2-methylisoborneol (MIB) episodes, since most of the previously identified MIB producers favor moderate/low light/temperature conditions. Here, we report a serious MIB outbreak over the period from Jul. 2018 to Jun. 2019 in a low-latitude reservoir with a mean annual water ...
2-methylisoborneol, etc ; Microcystis; Oscillatoriales; activated carbon; niches; odor compounds; odors; risk; China; Show all 9 Subjects
Abstract:
... Odor problems in source water caused by 2-methylisoborneol (MIB) have been a common issue in China recently, posing a high risk to drinking water safety. The earthy-musty odorant MIB has an extremely low odor threshold (4–16 ng/L) and is hard to remove via conventional processes in drinking water plants (DWP), and therefore could easily provoke complaints from consumers. This compound is produced ...
2-methylisoborneol, etc ; activated carbon; cineole; dimethyl disulfide; geosmin; odor compounds; odors; ozonation; ozone; Show all 9 Subjects
Abstract:
... Ozone and biological activated carbon (BAC) are known to be effective at removing odors in drinking water. However, the specific variations in complex odors and odorants along the course of advanced treatments in full-scale drinking water treatment plants (DWTP) have remained unclear. In this paper, the migration of odors and odorants through pre-ozonation, sedimentation, post-ozonation, and BAC t ...
2-methylisoborneol, etc ; Ictalurus punctatus; Planktothrix perornata; algicides; aquaculture; catfish; cost effectiveness; diuron; off flavors; Show all 9 Subjects
Abstract:
... “Musty” off‐flavor in pond‐raised Channel Catfish Ictalurus punctatus can result in an unpalatable and unmarketable product for catfish farmers in the southern United States. Certain species of cyanobacteria (blue‐green algae) in the catfish ponds produce 2‐methylisoborneol (MIB), which accumulates in the Channel Catfish flesh and causes musty off‐flavor. One management approach available to Unite ...
2-methylisoborneol, etc ; Flavobacterium; Pseudomonas; Sphingomonas; autumn; biodegradation; environmental management; eutrophication; fractionation; geosmin; spring; surface water; Show all 12 Subjects
Abstract:
... As taste-and-odor outbreaks are common in surface waters worldwide, extensive studies have focused on the identification of microorganisms involved in the production of 2-methylisoborneol (MIB) and geosmin (GSM). However, fewer studies have tried to identify potential degraders in natural environments. Eagle Creek Reservoir, a temperate and eutrophic water body, experienced two major seasonal odor ...
2-methylisoborneol, etc ; environmental technology; freshwater; gas chromatography; geosmin; mass spectrometry; odors; oxidation; ozone; taste; ultraviolet radiation; Show all 11 Subjects
Abstract:
... Traditional methodologies of conventional drinking water treatment are unable to remove some chemical compounds, such as those that cause odor and taste in drinking water. The present work aims to evaluate the efficiency of advanced oxidations processes, using UV radiation, O₃ and O₃ + UV in the degradation of geosmin (GSM) and 2-methylisoborneol (2-MIB) in synthetic samples. The efficiency of the ...
2-methylisoborneol, etc ; activated carbon; adsorption; fluorescence; industrial wastewater; lakes; models; organic matter; prediction; rivers; water quality; Show all 11 Subjects
Abstract:
... Natural organic matter (NOM) exerts negative impacts on 2-methylisoborneol (2-MIB) removal by powdered activated carbon (PAC), thus adding to the difficulty in accurate PAC dose prediction. Our study investigated the application of the ideal adsorbed solution theory-equivalent background compound (IAST-EBC) model and its simplified version for PAC dose prediction. Four raw water samples were emplo ...