Relevant bibliographies by topics / 3-nitrophenylhydrazine

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  2. Dissertations / Theses

Academic literature on the topic '3-nitrophenylhydrazine'

Author: Grafiati
Published: 6 August 2021
Last updated: 27 July 2025

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Journal articles on the topic "3-nitrophenylhydrazine"

1

Erdem, Ahmet, Hasan Genc, Nejdet Sen, Rafet Kilincarslan, and Emin Erdem. "The Synthesis and Reactions of Novel Pyrazole Derivatives by 4-phenylcarbonyl-5-phenyl-2,3-dihydro-2,3-furandione Reacted with Some Hydrazones." Revista de Chimie 68, no. 1 (2017): 143–46. http://dx.doi.org/10.37358/rc.17.1.5407.

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We report some novel pyrazole derivatives taking 4-phenylcarbonyl-5-phenyl-2,3-dihydro-2,3-furandione, 1. For this, 4-phenylcarbonyl-5-phenyl-2,3-dihydro-2,3-furandione, 1 was reacted with benzaldehyde(2- or 4-fluorophenyl)hydrazone to give 4-benzoyl-1-(2- or 4-fluorophenyl)-5-phenyl-1H-pyrazole-3-carboxylic acid 2a,b. Pyrazol derivative containing 2-fluorophenyl group 2a was converted into carboxylic chloride derivative 3a by thionyl chloride and then the compound 4a was obtained from reaction ammonia with compound 3a. In the next step, 4-benzoyl-1-(2-fluorophenyl)-5-phenyl-1H-pyrazole-3-carb
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2

Raju, R. V. Prabhakara, and R. Raghava Naidu. "Spectrophotometric Determination of Decamethrin and Its Residues in Insecticidal Formulations and in Water." Journal of AOAC INTERNATIONAL 77, no. 3 (1994): 748–51. http://dx.doi.org/10.1093/jaoac/77.3.748.

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Abstract Three spectrophotometric methods were developed for the microdetermination of decamethrin in insecticidal formulations and in water. The methods are based on the hydrolysis of decamethrin with methanolic KOH to 3-phenoxybenzaldehyde; condensation of the hydrolysis product with 2,4- dinitrophenylhydrazine (2,4-DNPH), 4-nitrophenylhydrazine (4-NPH), or 2,4,6-trinitrophenylhydrazine (2,4,6-TNPH) under alkaline conditions; and measurement of the condensates at the absorption maxima of 444,535, and 480 nm, respectively. The relationship between absorbance and concentration was linear in th
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3

PRATIMA, VERMA, and K. GUPTA V. "A New Sensitive Method for Determination of 4-Nitrophenylhydrazine using a New Reagent System." Journal of Indian Chemical Society Vol. 63, Aug 1986 (1986): 767–68. https://doi.org/10.5281/zenodo.6297552.

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Department of Chemistry, Ravishankar University, Raipur-492 010 <em>Manuscript received 3 February 1984, revised 29 July 2986, accepted 12 August 1986</em> A new sensitive method for the determination of 4-nitrophenylbydrazine has been proposed. The method is based on the oxidation of 4-nitrophenylhydrazine to 4-nitro&shy;phenyldiazonium chloride with selenious acid in strong HCl&nbsp;medium. The diazonium salt is then coupled with <em>N</em>-(1-naphthyDethylenediamine (NEDA) in HCl medium. Violet dye formed is measured at 545 nm against reagent blank. The reaction is fast, sensitive, and repr
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4

Amann, Laura Sophie, Oliver Frank, Corinna Dawid, and Thomas Frank Hofmann. "The Sensory-Directed Elucidation of the Key Tastants and Odorants in Sourdough Bread Crumb." Foods 11, no. 15 (2022): 2325. http://dx.doi.org/10.3390/foods11152325.

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Sourdough bread is highly enjoyed for its exceptional flavor. In contrast to bread crust, which has been investigated intensively, the knowledge on bread crumb is rather fragmentary. In this study, the taste-active compounds of sourdough bread crumb were identified and quantified. By means of recombination experiments and omission tests, the authentic flavor signature of sourdough rye bread crumb was decoded and recreated with ten key tastants and eleven key odorants. Based on the final taste and aroma recombinants, a fast and sensitive ultra-high-performance liquid chromatography-tandem mass
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5

Liu, Zhiqian, S. Richard O. Williams, Joe L. Jacobs, Aodan S. O. Neachtain, and Simone Rochfort. "A Chiral-LC-MS Method for the Simultaneous Quantification of Short-Chain Fatty Acids and D/L-Lactate in the Ruminal Fluid of Dairy Cows." Molecules 29, no. 6 (2024): 1398. http://dx.doi.org/10.3390/molecules29061398.

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Short-chain fatty acids (SCFA) and lactate in ruminal fluid are products resulting from the microbial fermentation of substrates and can be used to reflect the composition and activity of the ruminal microbiome. Determination of SCFA and D-/L-lactate in ruminal fluid currently requires two separate protocols, which is time-consuming and costly. In this study, we have optimised and validated a simple and unified 3-nitrophenylhydrazine (3-NPH) derivatisation protocol and a 20 min chiral-LC-MS method for the simultaneous quantification of all SCFA and D- and L-lactate in ruminal fluid. This metho
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6

Mótyán, Gergő, Barnabás Molnár, János Wölfling, and Éva Frank. "Microwave-Assisted Stereoselective Heterocyclization to Novel Ring d-fused Arylpyrazolines in the Estrone Series." Molecules 24, no. 3 (2019): 569. http://dx.doi.org/10.3390/molecules24030569.

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Microwave-assisted syntheses of novel ring d-condensed 2-pyrazolines in the estrone series were efficiently carried out from steroidal ,-enones and hydrazine derivatives. The ring-closure reaction of 16-benzylidene estrone 3-methyl ether with hydrazine in acetic acid resulted in a 2:1 diastereomeric mixture of two 16,17-cis fused pyrazolines, which is contrary to the former literature data for both stereoselectivity and product structure. However, the cyclization reactions of a mestranol-derived unsaturated ketone with different arylhydrazines in acidic ethanol furnished the heterocyclic produ
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7

Utz, Florian, Andrea Spaccasassi, Johanna Kreissl, et al. "Sensomics-Assisted Aroma Decoding of Pea Protein Isolates (Pisum sativum L.)." Foods 11, no. 3 (2022): 412. http://dx.doi.org/10.3390/foods11030412.

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The aroma of pea protein (Pisum sativum L.) was decrypted for knowledge-based flavor optimization of new food products containing pea protein. Sensomics helped to determine several volatiles via ultra-high performance liquid chromatography tandem mass spectrometry and 3-nitrophenylhydrazine derivatization. Among the investigated volatiles, representatives of aldehydes, ketones, and acids were reported in literature as especially important in pea and pea-related matrices. After validation of the method and quantitation of the corresponding analytes, sensory reconstitution as well as omission st
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8

Li, Cheng, Zhiqian Liu, Carolyn Bath, Leah Marett, Jennie Pryce, and Simone Rochfort. "Optimised Method for Short-Chain Fatty Acid Profiling of Bovine Milk and Serum." Molecules 27, no. 2 (2022): 436. http://dx.doi.org/10.3390/molecules27020436.

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Short-chain fatty acids (SCFA, C2-C5) in milk and serum are derived from rumen bacterial fermentation and, thus, have the potential to be used as biomarkers for the health status of dairy cows. Currently, there is no comprehensive and validated method that can be used to analyse all SCFAs in both bovine serum and milk. This paper reports an optimised protocol, combining 3-nitrophenylhydrazine (3-NPH) derivatisation and liquid chromatography-mass spectrometry (LC-MS) analysis for quantification of SCFA and β-hydroxybutyric acid (BHBA) in both bovine milk and bovine serum. This method is sensiti
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9

Alam, M. Mahmud, M. T. Uddin, Mohammed M. Rahman, Abdullah M. Asiri, and M. A. Islam. "A reliable electrochemical sensor developed based on ZnO/SnO₂ nanoparticles modified glassy carbon electrode." Advances in Biochips 2, no. 1 (2021): 24–34. http://dx.doi.org/10.25082/ab.2021.01.002.

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The 4-NPHyd (4-nitrophenylhydrazine) electrochemical sensor assembled using wet-chemically prepared ZnO/SnO2 nanoparticle (NPs) decorated a glassy carbon electrode (GCE) with conductive Nafion binder. The synthesized NPs characterized by XPS, ESEM, EDS, and XRD analysis. The calibration of the proposed sensor obtained from current versus concentration of 4-NPHyd found linear over a concentration (0.1 nM ~ 0.01 mM) of 4-NPHyd, which denoted as the dynamic range (LDR) for detection of 4-NPHyd. The 4-NPHyd sensor sensitivity calculated using the LDR slope considering the active surface of GCE (0.
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10

Sukumar, Chatterjee, K. Pillai Ajai, and K. Gupta V. "A simple and sensitive spectrophotometric determination of vanadium(v) in various environmental samples." Journal of Indian Chemical Society Vol. 78, Sep 2001 (2001): 479–81. https://doi.org/10.5281/zenodo.5902592.

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School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, India <em>Manuscript received 19 September 2000, revised</em><em>&nbsp;26 March&nbsp;2001, accepted 31 March&nbsp;2001</em> A simple and sensitive spectrophotometric method is proposed for the determination of vanadium in traces, which is based on the oxidation of 4-nitrophenylhydrazine to 4-nitrophenyldiazoniumchloride with vanadium(v) in strong hydrochloric acid medium. The diazonium salt is subsequently coupled with phloroglucinol to give a reddish orange coloured dye having maximum absorption at 440 nm. Beer
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Dissertations / Theses on the topic "3-nitrophenylhydrazine"

1

Levisson, Renée. "Implementation of a straightforward derivatizationmethod for the simultaneous analysis of short chainfatty acids and tricarboxylic acid cycle metabolitesby LC-qToF-MS." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-93417.

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Short-chain fatty acids (SCFAs) and the tricarboxylic acid (TCA) cycle metabolites aresmall hydrophilic compounds that play crucial roles in biological species ranging fromenergy metabolism, immune homeostasis to cellular signalling. There is a need for reliableand precise quantification of these metabolites in biological matrices as they can providecrucial information of metabolic status and potentially be used as diagnostic biomarkersfor different pathological and physiological conditions. However, their retention andseparation in traditional reversed-phase system, without chemical derivatiz
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