Month: September 2022

Lehotay, Steven J. published 《Comparison of analyte identification criteria and other aspects in triple quadrupole tandem mass spectrometry: Case study using UHPLC-MS/MS for regulatory analysis of veterinary drug residues in liquid and powdered eggs》 in 2022. The article was appeared in 《Analytical and Bioanalytical Chemistry》. They have made some progress in their research.Safety of 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide The article mentions the following:

Ultrahigh-performance liquid chromatog. (UHPLC) coupled with triple quadrupole tandem mass spectrometry (MS/MS) is one of the most powerful tools for the multiclass, multiresidue anal. of veterinary drugs, pesticides, mycotoxins, and other chem. contaminants in foods and other sample types. Until approx. 2010, com. MS/MS instruments using multiple reaction monitoring (MRM) were generally limited to min. dwell (and inter-dwell) times of 10 ms per ion transition. To achieve the needed accuracy and detection limits for hundreds of targeted analytes, older UHPLC-MS/MS methods typically acquired only two ion transitions per analyte (yielding only one ion ratio for qual. identification purposes), which is still the norm despite technol. advancements. Newer instruments permit as little as 1 ms (inter-)dwell times to afford monitoring of more MRMs/analyte with minimal sacrifices in accuracy and sensitivity. In this study, quantification and identification were assessed in the validation of 169 veterinary drugs in liquid and powd. eggs. Quant., an “extract-and-inject” sample preparation method yielded acceptable 70-120% recoveries and < 25% RSD for 139-141 (82-83%) of the 169 diverse drug analytes spiked into powd. and liquid eggs, resp., at three levels of regulatory interest. Qual., rates of false positives and negatives were compared when applying three different regulatory identification criteria in which two or three MRMs/drug were used in each case. Independent of the identification criteria, rates of false positives remained <10% for 95-99% of the drugs whether 2 or 3 ions were monitored, but the percent of drugs with >10% false negatives decreased from 25-45 to 10-12% when using 2 vs. 3 MRMs/analyte, resp. Use of a concentration threshold at 10% of the regulatory level as an identification criterion was also very useful to reduce rates of false positives independent of ion ratios. Based on these results, monitoring >2 ion transitions per analyte is advised when using MS/MS for anal., independent of SANTE/12682/2019, FDA/USDA, or 2002/657/EC identification criteria. (Quant)identification results using all three criteria were similar, but the SANTE criteria were advantageous in their greater simplicity and practical ease of use. And 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide (cas: 80-32-0) was used in the research process.

4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide(cas: 80-32-0) can be introduced in the drinking water to fabricate aqueous liquid formulations for combating bacterial and protozoal in animals.Safety of 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide Besides, sulfachloropyridazine associated to tripelennamine hydrocholoride has been demonstrated to function as an anti-stress agent in poultry after vaccinations.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Formula: C10H9ClN4O2S《Determination and occurrence of sulfonamide transformation products in surface waters》 was published in 2021. The authors were Cui, Hongyang;Chang, Hong;Zheng, Hongjin;Wan, Yi, and the article was included in《Science of the Total Environment》. The author mentioned the following in the article:

The transformation products of sulfonamides (SAs) have raised increasing environmental and health concerns in recent years, but information on their anal. and environmental fates remains limited. In this study, an anal. method using liquid chromatog. with tandem mass spectrometry (LC-MSMS) was optimized to simultaneously analyze 9 SA transformation products and 14 SAs in water samples. This method was applied to investigate the occurrence of antibiotics in three urban rivers in Beijing, and all of the target compounds were detected. N-acetylsulfamethoxazole, N-acetylsulfapyridine, and N-acetylsulfamethazine were found to be the predominant acetyl SAs in the aquatic environment, and high frequencies of hydroxylated SA (5-hydroxysulfapyridine) and glucuronide-conjugated SA (sulfamethoxazole β-D-glucuronide) were also detected. The SA transformation products accounted for 22-32% of the total concentrations of SAs and their transformation products in the water samples. The pollution levels of the compounds exerted only minor effects on the proportions of the SA transformation products. The compound-specific transformation of sulfamethoxazole, sulfapyridine, and sulfadiazine in the water samples was consistent with their acetylation efficiencies in metabolic processes in organisms, which suggests that the SA-acetylated products were derived mainly from biol. metabolism in humans or animals. This finding was supported by the fact that environmental degradation exerts a weak effect on SA profiles in the water samples. To complete the study, the researchers used 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide (cas: 80-32-0) .

4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide(cas: 80-32-0) is a sulfonamide antibiotic that is usually used as antibacterial anti-inflammatory drug, which has been applied in the treatment of acute urinary tract infections in childhood.Formula: C10H9ClN4O2SDue to its antibiotic activity, this chemical has been selected as an ingredient to prepare antibacterial composition.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of C10H9ClN4O2S《Occurrence and risk assessment of pharmaceuticals and personal care products (PPCPs) against COVID-19 in lakes and WWTP-river-estuary system in Wuhan, China》 was published in 2021. The authors were Chen, Xiangping;Lei, Lei;Liu, Sitian;Han, Jian;Li, Ruiwen;Men, Jun;Li, Lin;Wei, Lin;Sheng, Yaqi;Yang, Lihua;Zhou, Bingsheng;Zhu, Lizhong, and the article was included in《Science of the Total Environment》. The author mentioned the following in the article:

The consumption of pharmaceuticals and personal care products (PPCPs) for controlling and preventing the COVID-19 would have sharply increased during the pandemic. To evaluate their post-pandemic environmental impacts, 5 categories of drugs were detected in lakes and WWTP-river-estuary system near hospitals of Jinyintan, Huoshenshan, and Leishenshan in the 3 regions (Regions J, H and L) in Wuhan, China. The total amount of PPCPs (ranging 2.61-1122 ng/L in water and 0.11-164 ng/g dry weight in sediments) were comparable to historical reports in Yangtze River basin, whereas the detection frequency and concentrations of ribavirin and azithromycin were higher than those of historical studies. The distribution of concerned drugs varied with space, season, media, and water types: sampling sites located at WWTPs-river-estuary system around 2 hospitals (Regions L and J) usually had relatively high waterborne contamination levels, most of which declined in autumn; lakes had relatively low waterborne contamination levels in summer but increased in autumn. The potential risks of detected PPCPs were further evaluated using the multiple-level ecol. risk assessment (MLERA): sulfamethoxazole and azithromycin were found to pose potential risks to aquatic organisms according to a semi-probabilistic approach and classified as priority pollutants based on an optimized risk assessment. In general, the COVID-19 pandemic did not cause serious pollution in lakes and WWTPs-river-estuary system in Wuhan City. However, the increased occurrence of certain drugs and their potential ecol. risks need further attention. A strict source control policy and an advanced monitoring and risk warning system for emergency response and long-term risk control of PPCPs is urgent. To complete the study, the researchers used 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide (cas: 80-32-0) .

4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide(cas: 80-32-0) is a sulfonamide antibiotic that is usually used as antibacterial anti-inflammatory drug, which has been applied in the treatment of acute urinary tract infections in childhood.Synthetic Route of C10H9ClN4O2SDue to its antibiotic activity, this chemical has been selected as an ingredient to prepare antibacterial composition.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Hong, Songhee;Kwon, Namji;Kang, Hui-Seung;Jang, Eunyoung;Kim, Hyojeong;Han, Eunyoung published 《Simultaneous analysis of 21 sulfonamides, trimethoprim, ormetoprim, and dapsone in fish and shrimp samples by LC-MS/MS using the QuEChERS method》 in . The article was appeared in 《International Journal of Environmental Analytical Chemistry》. They have made some progress in their research.Related Products of 80-32-0 The article mentions the following:

Antibiotics and antibacterials, including sulfonamides, are components of the veterinary armamentarium used to prevent and treat diseases in seafood. However, the accumulation of veterinary drug residues in seafood can cause food safety concerns. This study aimed to verify the quant. anal. method for sulfonamides, trimethoprim, ormetoprim, and dapsone in seafood and to apply it to fish and shrimp distributed in Korean market. In the present study, three types of matrixes (shrimp, flatfish, and eels) were used to detect drugs (n = 25) (sulfonamides (n = 21), trimethoprim, ormetoprim, dapsone, and monoacetyldapsone). Matrixes were extracted with acetonitrile and mixed with 2 g of magnesium sulfate and 1 g of sodium acetate. After agitation, supernatants were mixed with 300 mg of C18 and centrifuged again. Then the supernatant was evaporated, dissolved in 50% methanol, and filtered through a PTFE filter. Extracts (5 μl) were then injected into the liquid chromatog.-tandem mass spectrometry system. The method was validated in terms of limit of detection, limit of quantitation, decision limit, decision capability, matrix effects, intra/inter-day accuracies, precisions, and stabilities and the method was applied to fish and shrimp sold in the Korean market. The validation results were found to be satisfactory. As a result of applying the validated method to fish and shrimp samples purchased from the Korean market, sulfacetamide, sulfadimethoxine, sulfamethoxazole, and sulfanilamide were detected in shrimp samples. The devised method for analyzing antibiotics in seafood samples enables antibiotic detection in fish samples distributed in the global market and should aid the adoption of preventative measures. To complete the study, the researchers used 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide (cas: 80-32-0) .

4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide(cas: 80-32-0) is a sulfonamide antibiotic that is usually used as antibacterial anti-inflammatory drug, which has been applied in the treatment of acute urinary tract infections in childhood.Related Products of 80-32-0Due to its antibiotic activity, this chemical has been selected as an ingredient to prepare antibacterial composition.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

HPLC of Formula: 80-32-0《Occurrence and removal of 25 antibiotics during sewage treatment processes and potential risk analysis》 was published in 2022. The authors were Wang, Xinting;Huang, Ning;Wang, Jin;Lu, Chunliu;Li, Guangying;Li, Fang;Hu, Zaoshi;Bi, Xiaoyu;Wu, Lieshan;Tian, Yan, and the article was included in《Water Science & Technology》. The author mentioned the following in the article:

The occurrence and removal of 25 antibiotics, including ten quinolones (QNs), four macrolides (MLs), four tetracyclines (TCs) and seven sulfonamides (SNs), were analyzed at two sewage treatment plants (STPs) with different treatment units in Guangxi Province, China. The results showed that 14 and 16 antibiotics were detected in the influent of the two STPs, with concentrations ranging from 13.7-4265.2 ng/L and 14.5-10761.7 ng/L, resp. Among the antibiotics, TCs were the main type in the study area, accounting for more than 79% of the total concentration of all antibiotics. The antibiotic removal efficiencies of the different process units ranged from 56.73% to 100.0%. It was found that the SN removal efficiency of the multistage composite mobile bed membrane bioreactor (MBBR) process was better than that of the continuous-flow Intermission biol. reactor (IBR) process, while the IBR process was better than the MBBR process in terms of removing TCs and MLs; however, there was no obvious difference in the QN removal efficiencies of these two processes. Redundancy anal. (RDA) showed a strong correlation between antibiotic concentration and COD (COD). Risk assessments indicated that algae, followed by invertebrates and fish, were the most sensitive aquatic organisms to the detected antibiotics. And 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide (cas: 80-32-0) was used in the research process.

4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide(cas: 80-32-0) can be introduced in the drinking water to fabricate aqueous liquid formulations for combating bacterial and protozoal in animals.HPLC of Formula: 80-32-0 Besides, sulfachloropyridazine associated to tripelennamine hydrocholoride has been demonstrated to function as an anti-stress agent in poultry after vaccinations.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Miguez-Suarez, Gabriel;Cardelle-Cobas, Alejandra;Sinisterra-Loaiza, Laura;Vazquez, Beatriz;Cepeda, Alberto;Nebot, Carolina published 《Development and Validation of Multi-Residue Method for Drugs Analysis in Human Feces by Liquid Chromatography-Tandem Mass Spectrometry》. The research results were published in《Molecules》 in 2022.Recommanded Product: 80-32-0 The article conveys some information:

The use of veterinary drugs in animal production is a common practice to secure animal and human health. However, residues of administrated drugs could be present in animal food products. Levels of drugs in food of animal origin are regulated within the European Union. In recent years, residues have been detected not only in food, but also in the environmental elements such as water or soil, meaning that humans are involuntarily exposed to these substances. This article presents a multiclass method for the anal. of various therapeutic groups of pharmaceuticals in human feces. Pharmaceuticals are extracted from feces with an acid extraction solvent, and after filtration the extract was analyzed by HPLC-MS/MS. A limit of detection of 10 ng/g was achieved for 9 pharmaceuticals, with linearity over 0.99 and repeatability and reproducibility lower than 20%. The method was satisfactorily applied in 25 feces samples of individuals that had declared not to be under medical treatment for the last two months. Results indicate the presence of six different compounds at concentration between 10 and 456 ng/g. This preliminary study showed the involuntary exposure of human gut microbiota to active substances such as pharmaceuticals. And 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide (cas: 80-32-0) was used in the research process.

4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide(cas: 80-32-0) can be introduced in the drinking water to fabricate aqueous liquid formulations for combating bacterial and protozoal in animals.Recommanded Product: 80-32-0 Besides, sulfachloropyridazine associated to tripelennamine hydrocholoride has been demonstrated to function as an anti-stress agent in poultry after vaccinations.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wang, Yu-Qing;Hu, Li-Xin;Zhao, Jia-Hui;Han, Yu;Liu, You-Sheng;Zhao, Jian-Liang;Yang, Bin;Ying, Guang-Guo published 《Suspect, non-target and target screening of pharmaceuticals and personal care products (PPCPs) in a drinking water system》 in 2022. The article was appeared in 《Science of the Total Environment》. They have made some progress in their research.Computed Properties of C10H9ClN4O2S The article mentions the following:

Drinking water quality and safety are very important in protecting human health. Chem. contaminants in drinking water system have become an increasing concern. Our knowledge about what chems. are present in drinking water is still limited. Here we screened chems. of emerging concern in a conventional drinking water system based on suspect, non-target screening and target anal., and assessed their variations in different seasons and different treatment units. Overall, 720 chems. were identified with HRMS databases from the suspect and non-target screening and 48 chems. in five categories were further confirmed with the high confidence level, with predominance of pharmaceuticals and personal care products (PPCPs) and pesticides. Four compounds are newly found in aquatic environment with no literature or chem. occurrence data record. Temporal variations and variable removals were observed for these chems. in the system. Target anal. of 110 PPCPs showed detection of 21, 19 and 22 compounds in the drinking water treatment plant with a concentration range of 0.11-844 ng/L in the three seasons, but only 8, 9 and 15 compounds detected in tap water (0.16-32.5 ng/L). The variations of the detected chems. were less obvious in tap water, with most having concentrations below 2 ng/L. The results indicated efficient removal for most PPCPs in the drinking water system. The findings from this study demonstrated the strong capability of combined non-target screening and target anal. in identifying and assessing various organic chems. in drinking water system. To complete the study, the researchers used 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide (cas: 80-32-0) .

4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide(cas: 80-32-0) can be introduced in the drinking water to fabricate aqueous liquid formulations for combating bacterial and protozoal in animals.Computed Properties of C10H9ClN4O2S Besides, sulfachloropyridazine associated to tripelennamine hydrocholoride has been demonstrated to function as an anti-stress agent in poultry after vaccinations.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 3-Cyanopyridine《Recyclable and Reusable Pd(OAc)₂/XPhos-SO₃Na/PEG-400/H₂O System for Cyanation of Aryl Chlorides with Potassium Ferrocyanide》 was published in 2022. The authors were Cai, Mingzhong;Liu, Rong;Xu, Caifeng;Huang, Bin, and the article was included in《Catalysis Letters》. The author mentioned the following in the article:

Pd(OAc)₂/XPhos-SO₃Na in a mixture of poly(ethylene glycol) (PEG-400) and water is shown to be a highly efficient catalyst for the cyanation of aryl chlorides with potassium ferrocyanide. The reaction proceeded smoothly at 100 or 120°C with K₂CO₃ or KOAc as base, delivering a variety of aromatic nitriles in good to excellent yields. The isolation of the crude products is facilely performed by extraction with cyclohexane and more importantly, both expensive Pd(OAc)₂ and XPhos-SO₃Na in PEG-400/H₂O system could be easily recycled and reused at least six times without any apparent loss of catalytic efficiency. To complete the study, the researchers used 3-Cyanopyridine (cas: 100-54-9) .

3-Cyanopyridine(cas: 100-54-9) also shows biological activity against autoimmune diseases, such as murine hepatitis, by inhibiting the proliferation of B cells and T cells.Reference of 3-Cyanopyridine This drug is not effective against cancer cells because it does not inhibit DNA synthesis or protein synthesis.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

SDS of cas: 100-54-9In 2021, Yuan, Feixiang;Xie, Shihua;Zhuo, Liang;Wang, Lei;Zhu, Hongjun published 《Metal-Free Synthesis of 2-Aryl Quinazolines via Tandem C-H/N-H Bond Functionalization》. 《ChemistrySelect》published the findings. The article contains the following contents:

The present work provides a facile and highly efficient strategy (ca. ∼92%) for the synthesis of quinazoline compounds e.g., I, which involves tandem C-H/N-H bond functionalization using metal-free conditions without the need for an external oxidant. Meanwhile, the reaction system exhibits good functional group tolerance and a wide substrate scope. Furthermore, corresponding isotope tracking experiments have shown that DMSO acts as a carbon source. Finally, this work affords a new strategy toward the further design and synthesis of heteroaromatic rings.3-Cyanopyridine (cas: 100-54-9) were involved in the experimental procedure.

3-Cyanopyridine(cas: 100-54-9) also shows biological activity against autoimmune diseases, such as murine hepatitis, by inhibiting the proliferation of B cells and T cells.SDS of cas: 100-54-9 This drug is not effective against cancer cells because it does not inhibit DNA synthesis or protein synthesis.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of C6H4N2《Silver-Promoted (4 + 1) Annulation of Isocyanoacetates with Alkylpyridinium Salts: Divergent Regioselective Synthesis of 1,2-Disubstituted Indolizines》 was published in 2021. The authors were Chen, Yan;Shatskiy, Andrey;Liu, Jian-Quan;Karkas, Markus D.;Wang, Xiang-Shan, and the article was included in《Organic Letters》. The author mentioned the following in the article:

An unprecedented silver-promoted regioselective (4 + 1) annulation of isocyanoacetates CNCH₂C(O)₂R (R = Me, Et) with pyridinium salts, e.g., 2-(2-oxo-2-phenylethyl)-isoquinolinium bromide is reported. The established protocol provides controlled, facile, and modular access to a range of synthetically useful N-fused heterocyclic scaffolds, e.g., I. A mechanistic pathway involving nucleophilic addition/protonation/elimination/cycloisomerization is proposed. The experimental procedure involved many compounds, such as 3-Cyanopyridine (cas: 100-54-9) .

3-Cyanopyridine(cas: 100-54-9) has been shown to have a number of pharmacological effects: it inhibits the production of prostaglandin E2 and nitric oxide in congestive heart failure patients; it prevents the formation of diazonium salt from benzene and nitrogen dioxide; it inhibits the growth of tumor cell lines; and it protects mice from radiation injury by scavenging reactive oxygen species. Electric Literature of C6H4N2

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem