Month: December 2022

Zou, Hongyan published the artcileUsing Chemical Benchmarking to Determine the Persistence of Chemicals in a Swedish Lake, Quality Control of 117-96-4, the main research area is chem benchmarking persistence compound Swedish lake.

Two approaches for measuring persistence in the field were compared: the chem. mass balance approach, and a novel chem. benchmarking approach. Ten pharmaceuticals, an x-ray contrast agent, and an artificial sweetener were studied in a Swedish lake. Acesulfame K was selected as a benchmark to quantify persistence using the chem. benchmarking approach. The 95% confidence intervals of the half-life for transformation in the lake system ranged from 780-5700 days for carbamazepine to <1-2 days for ketoprofen. The persistence estimates obtained using the benchmarking approach agreed well with those from the mass balance approach (1-21% difference), indicating that chem. benchmarking can be a valid and useful method to measure the persistence of chems. under field conditions. Compared to the mass balance approach, the benchmarking approach partially or completely eliminates the need to quantify mass flow of chems., so it is particularly advantageous when the quantification of mass flow of chems. is difficult. The benchmarking approach allows for ready comparison and ranking of the persistence of different chems. Environmental Science & Technology published new progress about Drugs. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Quality Control of 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Hernandez, Felix published the artcileLC-QTOF MS screening of more than 1000 licit and illicit drugs and their metabolites in wastewater and surface waters from the area of Bogota, Colombia, Name: Diatrizoic Acid, the main research area is LC QTOF MS screening licit illicit drug metabolite wastewater; screening licit illicit drug metabolite wastewater surface water Colombia.

A large screening of �000 emerging contaminants, focused on licit and illicit drugs and their metabolites, has been made in urban wastewaters (both influent and effluent) and surface waters from the area of Bogota, Colombia. After a simple generic solid-phase extraction (SPE) step with Oasis hydrophilic-lipophilic balanced (HLB) cartridges, analyses were made by ultra HPLC coupled to quadrupole time-of-flight mass spectrometry (UHPLC-QTOF MS) under MSE mode (sequential acquisition of mass spectra at low energy (LE) and high collision energy (HE)). Accurate mass measurements and the information provided by MSE on the presence of the (de)protonated mol. and fragment ions allowed the reliable identification of the compounds detected, even without reference standards being available in some cases (tentative identification). The compounds most frequently found were acetaminophen/paracetamol, carbamazepine and its dihydro-dihydroxylated metabolite, clarithromycin, diclofenac, ibuprofen, gemfibrozil, lincomycin, losartan, valsartan, the 2 metabolites of metamizole (4-acetamido-antipyrine and 4-formylamino-antipyrine), sucralose, and cocaine and its main metabolite benzoylecgonine. Caffeine, the sweetener saccharin, and 2 hydroxylated metabolites of losartan were tentatively identified in almost all samples analyzed. Pharmaceutical lidocaine was tentatively identified and subsequently confirmed with reference standard For the 1st time, a general overview of the occurrence of drugs and their metabolites in the aquatic environment of Colombia has been reported. In the near future, target methodologies, typically based on liquid chromatog. coupled to tandem mass spectrometry (LC-MS/MS), will need to be set up for accurate and sensitive quantification of the contaminants selected on the basis on the information provided here.

Analytical and Bioanalytical Chemistry published new progress about Drugs. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Name: Diatrizoic Acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Alves, Vinicius M. published the artcileAlarms about structural alerts, Product Details of C13H16O, the main research area is chem pharmaceutical safety assessment structural alert; quant structure activity relationship model chem pharmaceutical safety; QSAR; green chemistry; read-across; structural alerts; toxicity.

Structural alerts are widely accepted in chem. toxicol. and regulatory decision support as a simple, transparent means to flag potential chem. hazards or group compounds into categories for read-across. However, there is a growing concern that alerts disproportionally flag chems. as toxic, which questions their reliability as toxicity markers. Conversely, rigorously developed, properly validated statistical QSAR models can accurately, reliably predict the toxicity of a chem.; however, their use in regulatory toxicol. has been hampered by a lack of transparency and interpretability. This work demonstrated that contrary to the common perception of QSAR models as black boxes, they can identify statistically significant chem. substructures (QSAR-based alerts) which influence toxicity. The authors show using case studies, that the mere presence of structural alerts in a chem., irresp. of the derivation method (expert- or QSAR-based), should be perceived only as hypotheses of possible toxicol. effect. A new approach is proposed which synergistically integrates structural alerts and rigorously validated QSAR models for a more transparent, accurate safety assessment of new chems.

Green Chemistry published new progress about Drugs. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Product Details of C13H16O.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Peysson, William published the artcileDetermination of 136 pharmaceuticals and hormones in sewage sludge using quick, easy, cheap, effective, rugged and safe extraction followed by analysis with liquid chromatography-time-of-flight-mass spectrometry, Related Products of isoquinoline, the main research area is pharmaceutical hormone determination sewage sludge; extraction analysis liquid chromatog time flight mass spectrometry.

The aim was to develop an anal. method for the determination of a wide range of hormonal steroids and pharmaceutical compounds in sewage sludge. Thus, 136 substances were selected, including 119 pharmaceuticals and 17 hormonal steroids. An innovative sample preparation procedure based on the quick, easy, cheap, effective, rugged and safe (QuEChERS) method was developed. The anal. was then performed using liquid chromatog. coupled with time-of-flight mass spectrometry. This anal. procedure was validated by evaluating the specificity, quadratic curve fitting, recovery, reproducibility and limits of detection and quantification. The method allows the anal. of the majority of the target compounds with limits of detection 1-2500 ng/g, depending on the nature of the substance. The protocol was applied to various types of sludge (limed, digested, dried, liquid and composted) from several sewage works in France. Among the target compounds, 34 were quantified at levels �000 ng/g. Among the most commonly detected pharmaceuticals were the antiemetic domperidone (mean concentration 769 ng/g) and the antiepileptic lamotrigine (mean concentration 31 ng/g) whose presence had, to our knowledge, never been shown in sludge.

Journal of Chromatography A published new progress about Drugs. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Campos-Manas, Marina Celia published the artcileFast determination of pesticides and other contaminants of emerging concern in treated wastewater using direct injection coupled to highly sensitive ultra-high performance liquid chromatography-tandem mass spectrometry, Synthetic Route of 117-96-4, the main research area is pesticide pollutant wastewater direct injection UHPLC mass spectrometry; Contaminants of emerging concern (CECs); Direct injection; Liquid chromatography–mass spectrometry (LC–MS/MS); Microcontaminants; Multiresidue analysis; Treated wastewater.

It is well known that wastewater treatment plant (WWTP) effluents usually contain micropollutants such as pharmaceuticals (or their transformation products, TPs) or pesticides, which is a major issue when evaluating their possible reuse (e.g. for irrigation in agriculture). In search for an improved accuracy and simplicity, methods based on the direct injection of the sample (DI) represent a recent trend taking advantage of the increasing sensitivity of new mass spectrometry (MS) instruments. Thus, the present study shows the development and validation of a DI-based method by ultra-high-performance liquid chromatog. quadrupole-linear ion trap analyzer (UHPLC-QqLIT-MS/MS). The proposed method was applied to the monitoring of 115 organic microcontaminants (including pharmaceuticals, TPs and pesticides) at the ng L-1/μg L-1 level in wastewater effluents from urban WWTPs. Sample pre-treatment was reduced to acetonitrile addition and filtration of the mixture previous to LC-MS anal. Total anal. time was <15 min. A subsequent validation protocol was carried out in treated WW (TWW), following indications of SANTE and Eurachem Guidelines. Linearity and matrix effect were evaluated in the range of 10-1000 ng L-1. 70% of the analytes showed a moderate matrix effect (â‰?5%). Trueness (expressed as recovery) and precision (calculated as relative standard deviation, RSD) were evaluated at four concentration levels (20, 50, 500 and 1000 ng L-1) in TWW samples. The LODs ranged from 1 to 357 ng L-1 and the LOQs from 10 to 500 ng L-1. 92% of the compounds showed limits of quantification â‰?00 ng L-1. In most cases, mean recoveries were in the range 70-120%, and RSD values were â‰?0%. The validated method was successfully applied to the anal. of 10 TWW samples, demonstrating the occurrence of 67 target compounds at concentration levels from 26705 ng L-1 (4-aminoantipyrine) to 10 ng L-1 (tebuconazole and bezafibrate). Journal of Chromatography A published new progress about Drugs. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Synthetic Route of 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Singer, Heinz P. published the artcileRapid Screening for Exposure to “”Non-Target”” Pharmaceuticals from Wastewater Effluents by Combining HRMS-Based Suspect Screening and Exposure Modeling, Quality Control of 117-96-4, the main research area is rapid screening exposure nontarget pharmaceutical wastewater; liquid chromatog high resolution mass spectrometry suspect modeling.

Active pharmaceutical ingredients (APIs) have raised considerable concern over the past decade due to their widespread detection in water resources and their potential to affect ecosystem health. This triggered many attempts to prioritize the large number of known APIs to target monitoring efforts and testing of fate and effects. However, so far, a comprehensive approach to screen for their presence in surface waters has been missing. We explore a combination of an automated suspect screening approach based on liquid chromatog. coupled to high-resolution mass spectrometry and a model-based prioritization using consumption data, readily predictable fate properties and a generic mass balance model for activated sludge treatment to comprehensively detect APIs with relevant exposure in wastewater treatment plant effluents. The procedure afforded the detection of 27 APIs that had not been covered in our previous target method, which included 119 parent APIs. The newly detected APIs included 7 compounds with a high potential for bioaccumulation and persistence, and also 3 compounds that were suspected to stem from point sources rather than from consumption as medicines. Anal. suspect screening proved to be more selective than model-based prioritization, making it the method of choice for focusing anal. method development or fate and effect testing on those APIs most relevant to the aquatic environment. However, we found that state-of-the-practice exposure modeling used to predict potential high-exposure substances can be a useful complement to point toward oversights and known or suspected detection gaps in the anal. method, most of which were related to insufficient ionization.

Environmental Science & Technology published new progress about Drugs. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Quality Control of 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Locatelli, Marcello published the artcileFabric-Phase Sorptive Membrane Array As a Noninvasive In Vivo Sampling Device For Human Exposure To Different Compounds, Application of Diatrizoic Acid, the main research area is fabric sorption membrane array human exposure sampling device.

This study introduces an innovative device for the noninvasive sampling and chromatog. anal. of different compounds present in exhaled breath aerosol (EBA). The new sampling device, especially in light of the recent COVID-19 pandemic that forced many countries to impose mandatory facemasks, allows an easy monitoring of the subject′s exposure to different compounds they may come in contact with, actively or passively. The project combines the advantages of a fabric-phase sorptive membrane (FPSM) as an in vivo sampling device with a validated LC-MS/MS screening procedure able to monitor more than 739 chems. with an overall anal. time of 18 min. The project involves the noninvasive in vivo sampling of the EBA using an FPSM array inserted inside an FFP2 mask. The study involved 15 healthy volunteers, and no restrictions were imposed during or prior to the sampling process regarding the consumption of drinks, food, or drugs. The FPSM array-LC-MS/MS approach allowed us to effectively exploit the advantages of the two complementary procedures (the convenient sampling by an FPSM array and the rapid anal. by LC-MS/MS), obtaining a powerful and green tool to carry out rapid screening analyses for human exposure to different compounds The flexible fabric substrate, the sponge-like porous architecture of the high-efficiency sol-gel sorbent coating, the availability of a large cache of sorbent coatings, including polar, nonpolar, mixed mode, and zwitterionic phases, the easy installation into the facemask, and the possibility of sampling without interrupting regular activities provide FPSMs unparalleled advantages over other sampling techniques, and their applications are expected to expand to many other clin. or toxicol. studies.

Analytical Chemistry (Washington, DC, United States) published new progress about Drugs. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Application of Diatrizoic Acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

DiRico, Kenneth J. published the artcileUltra-High-Throughput Acoustic Droplet Ejection-Open Port Interface-Mass Spectrometry for Parallel Medicinal Chemistry, HPLC of Formula: 104-01-8, the main research area is preparation high throughput mass spectrometry.

High-throughput experimentation (HTE) has emerged as an important tool in drug discovery, providing a platform for preparing large compound libraries and enabling swift reaction screening over wide-ranging conditions. Recent advances in automated high-d., material-sparing HTE have necessitated the development of rapid analytics with sensitivity and resolution sufficient to identify products and/or assess reaction performance in a timely and data-rich manner. Combination of an ultra-throughput (UT) reader platform with Acoustic Droplet Ejection-Open Port Interface-Mass Spectrometry (ADE-OPI-MS) provides the requisite speed and sensitivity. Herein, the authors report the application of ADE-OPI-MS to HTE in the areas of parallel medicinal chem. and reaction screening.

ACS Medicinal Chemistry Letters published new progress about Drops. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, HPLC of Formula: 104-01-8.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Ono, Toshikazu published the artcileFlexible-color tuning and white-light emission in three-, four-, and five-component host/guest co-crystals by charge-transfer emissions as well as effective energy transfers, Product Details of C8H10O2, the main research area is host guest crystal charge energy transfer color tuning emission.

Three-, four-, and five-component host/guest crystals with multi-color and white light emission is described. Our strategy is based on the confinement of aromatic donor guests in supramol. acceptor hosts. The supramol. acceptor hosts (NDI-TPFB) were composed of N,N’-dipyrid-3-yl-1,4,5,8-naphthalenediimide (NDI) with two tris(pentafluorophenyl)borane (TPFB) linked by boron-nitrogen dative bonds as Lewis acid-base pairs, which spontaneously formed upon mixing the components. In the first part, a set of three-component crystals with 14 different aromatic guests were characterized to elucidate the structure-property relationships. In the latter part, a series of 17 types of four- and five-component crystals were formed with the use of binary or ternary guest inclusion systems, and their structural and photophys. properties were investigated. Among them, 14 types of crystals were formed effectively without destroying the crystal structure, as determined by X-ray diffraction and fluorescence microscopy. Notably, flexible color tuning, including white light emission, was realized by tuning the guest ratio and the combinations. Various intermol. interactions such as C-H···F interactions, π-π stacking, charge-transfer interactions, and inclusion phenomena were important for forming the crystals. This approach that yields a rational solution of multicomponent crystals could be potentially useful for obtaining novel photofunctional solid-state systems.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about Color. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Product Details of C8H10O2.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Nabipour, Hafezeh published the artcileFacile synthesis of a novel zinc-triazole complex for simultaneous improvement in fire safety and mechanical properties of epoxy resins, Safety of 3,5-Diamino-1,2,4-triazole, the main research area is epoxy resin zinc triazole complex mech property flame retardancy.

A novel zinc-triazole complex (ZTC) was synthesized by a co-precipitation method. The addition of 4 wt% of ZTC showed slight change in the thermal stability of the epoxy resin (EP) matrix, whereas the inclusion of 4 wt% of 3,5-diamino-1,2,4-triazole deteriorated the thermal stability. The glass transition temperature (Tg) of EP/ZTC-4% was dramatically enhanced to 162° from 150° for the unmodified epoxy, which could be ascribed to the increased crosslinking d. and the structural rigidity of ZTC. The flame-retardant property of EP/ZTC-4% was greatly improved, achieving UL-94 V-0 classification and a LOI value of 29.0%. The peak heat release rate, total heat release and smoke production rate of EP/ZTC-4% were dramatically declined by 72.9%, 86.0% and 73.8%, resp., compared to the unmodified EP. Such desirable features including high fire retardant efficiency and proper smoke suppression make zinc-triazole complex a promising candidate for high fire safety polymers.

Composites, Part A: Applied Science and Manufacturing published new progress about Chars. 1455-77-2 belongs to class isoquinoline, name is 3,5-Diamino-1,2,4-triazole, and the molecular formula is C2H5N5, Safety of 3,5-Diamino-1,2,4-triazole.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem