Tag: 300-400

Improvement of chemical analysis of antibiotics. XX Basic study on high-performance liquid chromatographic determination of four polyether antibiotics pre-derivatized with 1-bromoacetylpyrene was written by Asukabe, Hirohiko;Murata, Hideaki;Harada, Ken-Ichi;Suzuki, Makoto;Oka, Hisao;Ikai, Yoshitomo. And the article was included in Journal of Chromatography A in 1993.Synthetic Route of C18H11BrO The following contents are mentioned in the article:

A high-performance liquid chromatog. method for the determination of the polyether antibiotics (PEs), salinomycin (SL), monensin (MN), lasalocid (LA) and narasin (NA), based on a precolumn reaction system using 1-bromoacetylpyrene (1-BAP) as a fluorescence reagent, was established. Six standards of 1-pyrenacyl esters (PEs-PYs) including two of 1-pyrenacyl esters of internal standards, 18,19-dihydrosalinomycin (DSL) and 18,19-dihydro-20-ketosalinomycin (DKSL), were separated within 30 min on a Develosil 5C₁₈ (5 μm) column (250×4.6 mm I.D.) with methanol-water (97:3) as the mobile phase at a flow-rate of 1.0 mL/min and were detected at λ_ex 360 nm, λ_em 420 nm. This system was also effective for the separation between unused 1-BAP and PEs-PYs and the simultaneous determination of SL, MN, LA and NA was achieved at concentrations from 0.2 to 100 μg/mL. At concentrations of less than 10 μg/mL a silica gel cartridge was effective in eliminating the excess of unused reagents. Four calibration graphs with the internal standard method were linear between 20 and 100 μg/mL, 2 and 10 μg/mL and 0.2 and 1.0 μg/mL. The method is applicable to feed and residue analyses. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Synthetic Route of C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Synthetic Route of C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Copolymerization of n-butyl acrylate with methyl methacrylate by a novel photoinitiator, 1-(bromoacetyl)pyrene was written by Mishra, Anuradha;Daswal, Swati. And the article was included in International Journal of Chemical Kinetics in 2007.Synthetic Route of C18H11BrO The following contents are mentioned in the article:

The photopolymerization efficiency of pyrene (Py), 1-acetylpyrene (AP), and 1-(bromoacetyl)pyrene (BP) for copolymerization of n-butylacrylate (BA) with methylmethacrylate (MMA) was compared. A kinetic study of solution copolymerization in DMSO at 30 ± 0.2° showed that the Py could not initiate copolymerization even after 20 h, whereas with AP as initiator, less than 1% conversion was observed However, introduction of a Br in α-Me group of AP significantly enhanced the percent conversion. The kinetics and mechanism of copolymerization of BA with MMA using BP as photoinitiator have been studied in detail. The system follows nonideal kinetics (R_p α |BP|^0.67|BA|¹|MMA|^0.98), and degradative solvent transfer reasonably explains these kinetic nonidealities. The monomer reactivity ratios (MRRs) of MMA and BA have been estimated by the Finemann-Ross and Kelen-Tudos methods, by analyzing copolymer compositions determined by ¹H-NMR spectra. The values of r₁ (MMA) and r₂ (BA) were found to be 2.17 and 0.44, resp., which suggested the high concentration of alternating sequences in the random copolymers obtained. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Synthetic Route of C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Synthetic Route of C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

High-performance liquid chromatographic-fluorescence determination of human fecal bile acids was written by Ikawa, Shiro;Miyake, Mariko;Mura, Tetsuo;Ikeguchi, Masahide. And the article was included in Journal of Chromatography in 1987.COA of Formula: C18H11BrO The following contents are mentioned in the article:

A HPLC method with fluorescence detection was developed for the determination of human fecal bile acids, especially free fecal bile acids. Fecal bile acids were extracted by using an Amberlite XAD-2 column and then fractionated into 4 groups (free, glycine-conjugated, taurine-conjugated, and sulfated bile acids) on a piperidinohydroxypropyl-Sephadex LH 20 column. The free bile acid fraction and free bile acids obtained after enzymic hydrolysis and/or solvolysis of the 3 other fractions were derivatized with 1-bromoacetylpyrene and dicyclohexyl-18-crown-6-ether. The derivatized bile acids were separated stepwise on a Shim-pack CLC-ODS column with MeCN-MeOH-H₂O (100:50:30) (A), (100:50:20) (B), and (100:50:0) (C) as mobile phases while changing automatically from A to C by using a solvent changer. Calibration curves of bile acid standards were linear in the range 20-400 pmol when monitored at 370 nm (excitation) and 440 nm (emission). Percent recoveries of bile acids from human feces samples were 80-95%. The method is applicable clin. and is sensitive, reliable, and useful for the detailed determination of human fecal bile acids, especially of free bile acids. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5COA of Formula: C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). The principal reactions for organobromides include dehydrobromination, Grignard reactions, reductive coupling, and nucleophilic substitution.COA of Formula: C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Nucleophilicity and solvent effects on the kinetics of 4-(pyren-1-yl)thiazol-2-amine interaction with 4,6-dinitrobenzofuroxan was written by El Guesmi, Nizar;Hussein, Essam M.;Asghar, Basim H.;Obaid, Rami J.;Jassas, Rabab S.;Alharbi, Ahmed;Altass, Hatem M.;Althagafi, Ismail I.;Morad, Moataz;Moussa, Ziad;Ahmed, Saleh A.. And the article was included in Arabian Journal of Chemistry in 2020.Computed Properties of C18H11BrO The following contents are mentioned in the article:

A multistep synthesis of novel pyrene-based thiazole moiety been has been realized following some synthetic challenges and complications. The chem. structure of the synthesized compound has been established on the basis of both spectroscopic and anal. tools. Its nucleophilic reactivity with 4,6-dinitrobenzofuroxan (DNBF) has been successfully studied in solution A kinetic study of the covalent electrophile/nucleophile combination of dinitrobenzofuroxan (DNBF, electrophile) and 4-(pyren-1-yl)thiazol-2-amine (nucleophile) resulting in the formation of the corresponding σ-adduct in solution is reported. The rate constant (k₁) of the second-order relating to the C-C bond forming step of this complexation process has been found to fit into the linear correlation log k = s_N (N + E), thereby permitting the evaluation of the nucleophilicity parameter (N) of the 4-(pyren-1-yl)thiazol-2-amine. 4-(Pyren-1-yl)thiazol-2-amine has been subsequently ranked according to its reactivity profile on the general nucleophilicity scale developed recently by Mayr et al., leading to an interesting and direct comparison over a large domain of π-, σ-, and n-nucleophiles. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Computed Properties of C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Computed Properties of C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Reaction with organic halides as a general method for the covalent functionalization of nanosheets of 2D chalcogenides and related materials was written by Manjunatha, S.;Rajesh, S.;Vishnoi, Pratap;Rao, C. N. R.. And the article was included in Journal of Materials Research in 2017.Name: 2-Bromo-1-(pyren-1-yl)ethanone The following contents are mentioned in the article:

Prompted by the success in functionalizing 2D sheets of MoS₂ and MoSe₂ by their reaction with organic halides, we have investigated the functionalization of layered tungsten chalcogenides, WS₂, WSe₂, and WTe₂, by their reaction with substituted iodobenzenes as well as fluorophores based on pyrene and coumarin. Carbon-chalcogenide bonds are formed readily in the case of metallic chalcogenides while there is need for the Pd(0) catalysts in the case of insulating chalcogenides. Thus, the formation of carbon-chalcogen (S, Se, and Te) bonds is accomplished with the metallic 1T as well as the semiconducting 2H phases of the tungsten chalcogenides. Functionalization in the case of substituted iodobenzenes is favored by the electron withdrawing groups in the benzene ring. Interestingly, functionalization has been successful with other insulating layered chalcogenides such as GaS and GaSe. Reaction with organic halides emerges as a general method for the covalent functionalization of chalcogenide nanosheets, suggesting the possible use of this strategy to functionalize various chalcogenide structures. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Name: 2-Bromo-1-(pyren-1-yl)ethanone).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). The principal reactions for organobromides include dehydrobromination, Grignard reactions, reductive coupling, and nucleophilic substitution.Name: 2-Bromo-1-(pyren-1-yl)ethanone

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

1-(Bromoacetyl)pyrene, a novel photoinitiator for the copolymerization of styrene and methyl methacrylate was written by Mishra, Anuradha;Daswal, Swati. And the article was included in Radiation Physics and Chemistry in 2006.Formula: C18H11BrO The following contents are mentioned in the article:

The photopolymerization of styrene (Sty) with Me methacrylate (MMA) induced by pyrene (Py), 1-acetylpyrene (APy) and 1-(bromoacetyl)pyrene (BrPy) was studied. Py was completely ineffective while APy could just initiate the copolymerization in 15 h. Introduction of a Br in α-Me group of APy significantly enhanced the polymerization efficiencies. The kinetics and mechanism of bulk copolymerization of Sty with MMA (Sty-co-MMA) using BrPy as a sole photoinitiator was studied in detail. The kinetic data, inhibiting effect of benzoquinone and ESR studies suggest that the polymerization proceeds via a free radical mechanism. The system follows non-ideal kinetics (R_p α[BrPy]^0·7[Sty]¹[MMA]^1·04) and degradative solvent transfer reasonably explains these kinetic non-idealities. The co-monomer reactivity ratios calculated by using the Finemann-Ross and Kelen-Tudos models were r₁ (MMA)=0.48 and r₂ (Sty)=0.52. The value of k²_p/k_t for the present system is 2.28 × 10^-5 l/mol/s. IR and NMR anal. confirms the random structure of the copolymer. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Formula: C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. Many of the alkyl bromine derivatives are excellent alkylating agents since bromides are good leaving groups. Tribromides, like tetrabutylammonium tribromide, are used as a solid source of bromine. N-bromosuccimide (NBS) is used for the selective bromination of allylic bonds.Formula: C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Carbon nanotube – protamine hybrid: evaluation of DNA cell penetration was written by Caoduro, Cecile;Kacem, Raoudha;Boukari, Khaoula;Picaud, Fabien;Brachais, Claire-Helene;Monchaud, David;Borg, Christophe;Boulahdour, Hatem;Gharbi, Tijani;Delage-Mourroux, Regis;Hervouet, Eric;Pudlo, Marc. And the article was included in Carbon in 2016.COA of Formula: C18H11BrO The following contents are mentioned in the article:

Carbon nanotubes (CNTs) represent a class of nanomaterials with important potential for biomedical and biotechnol. applications. CNT based vectorization is an emerging approach to the transport of nucleic acid through cell membrane but limited by detachment of DNA and degradation process. To increase DNA internalization, it was proved that cationic functionalized CNT was essential. In such a way, protamine efficiently used in several transfection processes is a cationic protein which was never associated to CNT. We propose here a novel nanovector based on single-walled carbon nanotubes (SWCNT) functionalized by protamine. Our results based on qPCR methods clearly indicate that protamine-SWCNT/DNA hybrids were much more successful than ammonium-SWCNT/DNA hybrids to cross cell membrane and penetrate into cells. We also studied the cellular internalization mechanism of our complexes and showed that endocytosis was strongly involved. Finally, we proposed mol. dynamic simulations to understand the formation of the protamine-SWCNT/DNA complex and to extract the interaction responsible for its deliverance upon cell membrane. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5COA of Formula: C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). Bromine-containing agents predominate because not only are they more efficient than similar chlorine-containing species, but also the high atomic weight of bromine ensures that it is present in a high mass fraction within most organobromine compounds.COA of Formula: C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Fluorescence high-performance liquid chromatographic determination of free and conjugated bile acids in serum and bile using 1-bromoacetylpyrene as a prelabeling reagent was written by Kamada, Satoru;Maeda, Masako;Tsuji, Akio. And the article was included in Journal of Chromatography, Biomedical Applications in 1983.Application of 80480-15-5 The following contents are mentioned in the article:

Free and conjugated bile acids are extracted from serum or bile by using a Sep-Pak C₁₈ cartridge and then fractionated on a piperidinohydroxypropyl-Sephadex LH 20 column. Free and glycine-conjugated bile acids are labeled with 1-bromoacetylpyrene in MeCN with dicyclohexyl-18-crown-6-ether as catalyst. Taurine-conjugated bile acids are hydrolyzed by cholylglycine hydrolase and then derivatized by the same reagent. Derivatized bile acids are separated stepwise on a reversed-phase column (Radial Pak A) using MeCN-MeOH-H₂O (100:50:40) and (100:50:20) as mobile phases. The eluate is monitored by a fluorometer at 370 nm (excitation) and 440 nm (emission). Linearities of fluorescence intensities (peak heights) with the amounts of free and conjugated bile acids were obtained between 50 and 200 pmol for free bile acids and between 25 and 100 pmol for glycine-conjugated bile acids, resp. Recoveries from serum and bile samples are ≥90%. This method is sensitive, reliable, and useful for the simultaneous determination of free and conjugated bile acids in serum and bile. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Application of 80480-15-5).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals. Organobromine compounds have fallen under increased scrutiny for their environmental impact. Bromine-containing agents predominate because not only are they more efficient than similar chlorine-containing species, but also the high atomic weight of bromine ensures that it is present in a high mass fraction within most organobromine compounds.Application of 80480-15-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

1-(Bromoacetyl)pyrene, a novel photoinitiator for the copolymerization of styrene and acrylonitrile was written by Mishra, Anuradha;Daswal, Swati. And the article was included in Colloid and Polymer Science in 2007.SDS of cas: 80480-15-5 The following contents are mentioned in the article:

A comparative study on photoinitiated solution copolymerization of Styrene (Sty), with acrylonitrile (AN) using pyrene, 1-acetylpyrene, and 1-(bromoacetyl)pyrene (BrPy) as initiators, showed that the introduction of a chromophoric moiety, bromoacetyl (-COCH₂Br), significantly increased the photoinitiating ability of pyrene. The kinetics and mechanism of copolymerization of Sty with AN (Sty-co-AN) using BrPy as photoinitiator has been studied in detail. The kinetic data, inhibiting effect of benzoquinone, and ESR (ESR) studies suggest that the polymerization proceeds via a free radical mechanism. The system followed non-ideal kinetics (R_pα[BrPy]^0.7[Sty]^1.09[AN]^1.01) and degradative solvent transfer reasonably explained these kinetic non-idealities. The co-monomer reactivity ratios calculated by using the Finemann-Ross and Kelen-Tudos models were r₁ (Sty) = 0.39 and r₂ (AN) = 0.05. The reactivity ratios strongly indicate that the 2 monomers enter in almost alternating arrangement along the copolymer chain. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5SDS of cas: 80480-15-5).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals. Organobromine compounds have fallen under increased scrutiny for their environmental impact. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.SDS of cas: 80480-15-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Improvement of chemical analysis of antibiotics. XI. Simultaneous fluorodensitometric determination of polyether antibiotics was written by Asukabe, Hirohiko;Yoneyama, Hiromi;Mori, Yuji;Harada, Kenichi;Suzuki, Makoto;Oka, Hisao. And the article was included in Journal of Chromatography in 1987.Computed Properties of C18H11BrO The following contents are mentioned in the article:

A simultaneous determination of three polyether antibiotics, salinomycin, monensin and lasalocid, was established by silica gel and RP-18 high-performance TLC (HPTLC) using 18,19-dihydrosalinomycin and 18,19-dihydro-20-ketosalinomycin as internal standards Fluorescent derivatives of the polyethers were prepared by reaction of their Na salts with 1-bromoacetylpyrene and Kryptofix 222 in MeCN. A silica gel HPTLC plate with CCl₄-EtOAc-MeCN (50:5:10) as a solvent system and a RP-18 HPTLC plate with EtOAc-MeCN-acetone-MeCN (15:2:1:55) gave satisfactory separations of the 5 pyrenacyl esters of salinomycin, monensin, lasalocid, 18,19-dihydrosalinomycin and 18,19-dihydro-20-ketosalinomycin. Under these conditions, the internal standard 18,19-dihydrosalinomycin was suitable for the simultaneous stimulation determination of salinomycin and monensin, and 18,19-dihydro-20-ketosalinomycin for lasalocid. A linear relationship was obtained between the fluorescence intensity and the amount of each antibiotic in the range 2-14 pg. The detection limit of the 3 antibiotics was 100 pg. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Computed Properties of C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Most of the natural organobromine compounds are produced by marine organisms, and several brominated metabolites with antibacterial, antitumor, antiviral, and antifungal activity have been isolated from seaweed, sponges, corals, molluscs, and others. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Computed Properties of C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary