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1. A non-natural biosynthesis pathway toward 2-methylisoborneol

Author:
Binbin Gu; Jeroen S. Dickschat
Source:
Chemical communications 2022 v.58 no.27 pp. 4316-4319
ISSN:
1364-548X
Subject:
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. ...
DOI:
10.1039/d2cc00636g

2. Temperature affects growth, geosmin/2-methylisoborneol production, and gene expression in two cyanobacterial species

Author:
Qingyue Shen; Qian Wang; Hanchen Miao; Marie Shimada; Motoo Utsumi; Zhongfang Lei; Zhenya Zhang; Osamu Nishimura; Yasuhiro Asada; Naoshi Fujimoto; Hirokazu Takanashi; Michihiro Akiba; Kazuya Shimizu
Source:
Environmental science and pollution research 2022 v.29 no.8 pp. 12017-12026
ISSN:
0944-1344
Subject:
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 ...
DOI:
10.1007/s11356-021-16593-5

3. Benthic cyanobacteria: A utility-centred field study

Author:
Virginie Gaget; Husein Almuhtaram; Faith Kibuye; Peter Hobson; Arash Zamyadi; Eric Wert; Justin D. Brookes
Source:
Harmful algae 2022 v.113 pp. 102185
ISSN:
1568-9883
Subject:
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 ...
DOI:
10.1016/j.hal.2022.102185

4. Moderate pre-ozonation coupled with a post-peroxone process remove filamentous cyanobacteria and 2-MIB efficiently: From bench to pilot-scale study

Author:
Hangzhou Xu; Jing Zhang; Wenjuan Wang; Yizhen Li; Haiyan Pei
Source:
Journal of hazardous materials 2022 v.424 pp. 127530
ISSN:
0304-3894
Subject:
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 ...
DOI:
10.1016/j.jhazmat.2021.127530

5. Off-flavors and lipid components in rainbow trout (Oncorhynchus mykiss) reared in RAS: Differences in families of low and high lipid contents

Author:
P.C. Lindholm-Lehto; J. Koskela; H. Leskinen; J. Vielma; A. Kause
Source:
Aquaculture 2022 v.559 pp. 738418
ISSN:
0044-8486
Subject:
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 ...
DOI:
10.1016/j.aquaculture.2022.738418

6. Off-Flavors in Aquacultured Fish: Origins and Implications for Consumers

Author:
Jéssica A. Moretto; Paloma N. N. Freitas; Juliana P. Souza; Thalita M. Oliveira; Isabella Brites; Ernani Pinto
Source:
Fishes 2022 v.7 no.1 pp. -
ISSN:
2410-3888
Subject:
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 ...
DOI:
10.3390/fishes7010034

7. Desorption of micropollutant from superfine and normal powdered activated carbon in submerged-membrane system due to influent concentration change in the presence of natural organic matter: Experiments and two-component branched-pore kinetic model

Author:
Long Pan; Akiko Nakayama; Yoshihiko Matsui; Taku Matsushita; Nobutaka Shirasaki
Source:
Water research 2022 v.208 pp. 117872
ISSN:
0043-1354
Subject:
2-methylisoborneol,   etc   ; activated carbon; adsorption; coagulation; desorption; diffusivity; kinetics; liquids; microfiltration; models; organic matter; pollutants; research; risk; water;     Show all 15 Subjects
Abstract:
... 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 ...
DOI:
10.1016/j.watres.2021.117872

8. Seasonal dynamics of odor compounds concentration driven by phytoplankton succession in a subtropical drinking water reservoir, southeast China

Author:
Tianhao Wu; Guangwei Zhu; Zicong Wang; Mengyuan Zhu; Hai Xu
Source:
Journal of hazardous materials 2022 v.425 pp. 128056
ISSN:
0304-3894
Subject:
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 ...
DOI:
10.1016/j.jhazmat.2021.128056

9. Evaluation of the MIB-producing potential based on real-time qPCR in drinking water reservoirs

Author:
Md. Suruzzaman; Tengxin Cao; Jinping Lu; Yongjing Wang; Ming Su; Min Yang
Source:
Environmental research 2022 v.204 pp. 112308
ISSN:
0013-9351
Subject:
2-methylisoborneol,   etc   ; Cyanobacteria; databases; detection limit; genes; oligodeoxyribonucleotides; quantitative polymerase chain reaction; research; reverse transcription; risk assessment; secondary metabolites;     Show all 11 Subjects
Abstract:
... 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 ...
DOI:
10.1016/j.envres.2021.112308

10. Potential influence of overwintering benthic algae on water quality

Author:
Lefan Yao; Yuansheng Huang; Lei Chen; Yiliang He
Source:
Journal of environmental sciences (China) 2022 v.117 pp. 58-70
ISSN:
1001-0742
Subject:
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 ...
DOI:
10.1016/j.jes.2022.01.021

11. Developing a robust and sensitive analytical method to detect off-flavor compounds in fish

Author:
Petra Camilla Lindholm-Lehto
Source:
Environmental science and pollution research 2022 v.29 no.37 pp. 55866-55876
ISSN:
0944-1344
Subject:
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 ...
DOI:
10.1007/s11356-022-19738-2

12. Degradation of geosmin and 2-methylisoborneol in UV-based AOPs for photoreactors with reflective inner surfaces: Kinetics and transformation products

Author:
Tan Meng; Xiao Su; Peizhe Sun
Source:
Chemosphere 2022 v.306 pp. 135611
ISSN:
0045-6535
Subject:
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 ...
DOI:
10.1016/j.chemosphere.2022.135611

13. Occurrence and phylogenetic analysis of Pseudanabaena sp. producing 2‐methylisoborneol in drinking water source of South Korea

Author:
Jung Eun Lee; Mi Na Yu; Soonju Yu; Myeongseop Byeon
Source:
Environmental microbiology reports 2022 v.14 no.2 pp. 197-202
ISSN:
1758-2229
Subject:
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 ...
DOI:
10.1111/1758-2229.13031

14. Driving forces for the growth of MIB-producing Planktothricoides raciborskii in a low-latitude reservoir

Author:
Jinping Lu; Ming Su; Yuliang Su; Bin Wu; Tengxin Cao; Jiao Fang; Jianwei Yu; Honggang Zhang; Min Yang
Source:
Water research 2022 v.220 pp. 118670
ISSN:
0043-1354
Subject:
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 ...
DOI:
10.1016/j.watres.2022.118670

15. Ecological niche and in-situ control of MIB producers in source water

Author:
Ming Su; MD. Suruzzaman; Yiping Zhu; Jinping Lu; Jianwei Yu; Yu Zhang; Min Yang
Source:
Journal of environmental sciences (China) 2021 v.110 pp. 119-128
ISSN:
1001-0742
Subject:
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 ...
DOI:
10.1016/j.jes.2021.03.026

16. Variation and mitigation of musty, septic, chemical, grassy, fishy odors and corresponding odorants in a full-scale drinking water treatment plant with advanced treatments

Author:
Qingyuan Guo; Xiaohong Zhang; Xuan Li; Tianming Chen; Bairen Yang; Cheng Ding; Chunmiao Wang; Mei Pan; Weixing Ma; Jianwei Yu
Source:
Chemosphere 2021 v.269 pp. 128691
ISSN:
0045-6535
Subject:
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 ...
DOI:
10.1016/j.chemosphere.2020.128691

17. Impact of Diuron Applications to Commercial Catfish Ponds on Musty‐Odor Cyanobacteria, Musty Off‐Flavor Compound Concentrations, and Channel Catfish Fillet Flavor Quality

Author:
Schrader Kevin K.
Source:
North American journal of aquaculture 2022 v.84 no.2 pp. 149-155
ISSN:
1522-2055
Subject:
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 ...
Handle:
10113/7709619
DOI:
10.1002/naaq.10225

18. Occurrences of 2-methylisoborneol and geosmin –degrading bacteria in a eutrophic reservoir and the role of cell-bound versus dissolved fractions

Author:
Nicolas A. Clercin; Gregory K. Druschel; Mark Gray
Source:
Journal of environmental management 2021 v.297 pp. 113304
ISSN:
0301-4797
Subject:
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 ...
DOI:
10.1016/j.jenvman.2021.113304

19. Comparative assessment of the degradation of 2-methylisoborneol and geosmin in freshwater using advanced oxidation processes

Author:
Mariana Maria Gassen Berlt; Rosana de Cassia de Souza Schneider; Ênio Leandro Machado; Lourdes Teresinha Kist
Source:
Environmental technology 2021 v.42 no.24 pp. 3832-3839
ISSN:
1479-487X
Subject:
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 ...
DOI:
10.1080/09593330.2020.1743371

20. Mechanisms and application of the IAST-EBC model for predicting 2-MIB adsorption by PAC in authentic raw waters: Correlation between NOM competitiveness and water quality parameters

Author:
Junying Ren; Sihui Yang; Lei Li; Shuili Yu; Naiyun Gao
Source:
Journal of hazardous materials 2022 v.427 pp. 127904
ISSN:
0304-3894
Subject:
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 ...
DOI:
10.1016/j.jhazmat.2021.127904