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Showing 1 to 12 of 20 entries
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A study of the competitive multiple hydrogen bonding effect and its associated excited-state proton transfer tautomerism.

Physical chemistry chemical physics : PCCP

Chen YT, Wu PJ, Peng CY, Shen JY, Tsai CC, Hu WP, Chou PT.
PMID: 29058008
Phys Chem Chem Phys. 2017 Nov 01;19(42):28641-28646. doi: 10.1039/c7cp05002j.

1,8-Dihydroxynaphthalene-2,7-dicarbaldehyde (DHDA) has been strategically designed and synthesized with the aim to study the competitive multiple hydrogen bonding (H-bonding) effect and the associated excited-state intramolecular proton transfer reaction (ESIPT). In nonpolar solvents such as cyclohexane, equilibrium exists between the...

Kinetics of the reaction of U(VI) with benzene-1,2-diphosphonic acid.

Dalton transactions (Cambridge, England : 2003)

Hall H, Sullivan JC, Rickert PG, Nash KL.
PMID: 15909052
Dalton Trans. 2005 Jun 07;(11):2011-6. doi: 10.1039/b503601a. Epub 2005 May 06.

The kinetics of the reaction between dioxouranium(VI) and benzene-1,2-diphosphonic acid (BzDPA) has been investigated by stopped-flow spectrophotometry. The rate of reaction of uranyl ions with Arsenazo III (2,7-bis(2,2'-arsonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid) in 50:50 methanol-water solutions was also determined. Both formation and...

Microbial melanin: Recent advances in biosynthesis, extraction, characterization, and applications.

Biotechnology advances

Singh S, Nimse SB, Mathew DE, Dhimmar A, Sahastrabudhe H, Gajjar A, Ghadge VA, Kumar P, Shinde PB.
PMID: 34022328
Biotechnol Adv. 2021 Dec;53:107773. doi: 10.1016/j.biotechadv.2021.107773. Epub 2021 May 20.

Melanin is a common name for a group of biopolymers with the dominance of potential applications in medical sciences, cosmeceutical, bioremediation, and bioelectronic applications. The broad distribution of these pigments suggests their role to combat abiotic and biotic stresses...

High-Energy Proton-Beam-Induced Polymerization/Oxygenation of Hydroxynaphthalenes on Meteorites and Nitrogen Transfer from Urea: Modeling Insoluble Organic Matter?.

Chemistry (Weinheim an der Bergstrasse, Germany)

Bizzarri BM, Manini P, Lino V, d'Ischia M, Kapralov M, Krasavin E, Mráziková K, Šponer J, Šponer JE, Di Mauro E, Saladino R.
PMID: 32846019
Chemistry. 2020 Nov 20;26(65):14919-14928. doi: 10.1002/chem.202002318. Epub 2020 Oct 16.

Formation and structural modification of oxygenated polycyclic aromatic hydrocarbons (oxyPAHs) by UV irradiation on minerals have recently been proposed as a possible channel of PAH transformation in astrochemical and prebiotic scenarios of possible relevance for the origin of life....

The Protective Role of 1,8-Dihydroxynaphthalene-Melanin on Conidia of the Opportunistic Human Pathogen Aspergillus fumigatus Revisited: No Role in Protection against Hydrogen Peroxide and Superoxides.

mSphere

Keizer EM, Valdes ID, McCann BL, Bignell EM, Wösten HAB, de Cock H.
PMID: 34986316
mSphere. 2022 Jan 05;e0087421. doi: 10.1128/msphere.00874-21. Epub 2022 Jan 05.

Previously, 1,8-dihydroxynaphthalene (DHN)-melanin was described to protect Aspergillus fumigatus against hydrogen peroxide (H

A Robust Fungal Allomelanin Mimic: An Antioxidant and Potent π-Electron Donor with Free-Radical Properties that can be Tuned by Ionic Liquids.

ChemPlusChem

Manini P, Lino V, Franchi P, Gentile G, Sibillano T, Giannini C, Picardi E, Napolitano A, Valgimigli L, Chiappe C, d'Ischia M.
PMID: 31944050
Chempluschem. 2019 Sep;84(9):1331-1337. doi: 10.1002/cplu.201900195. Epub 2019 Jun 06.

Developing effective strategies to increase the chemical stability and to fine-tune the physico-chemical properties of melanin biopolymers by rational control of π-electron conjugation is an important goal in materials science for biomedical and technological applications. Herein we report that...

The Protective Role of 1,8-Dihydroxynaphthalene-Melanin on Conidia of the Opportunistic Human Pathogen Aspergillus fumigatus Revisited: No Role in Protection against Hydrogen Peroxide and Superoxides.

mSphere

Keizer EM, Valdes ID, McCann BL, Bignell EM, Wösten HAB, de Cock H.
PMID: 34986316
mSphere. 2022 Jan 05;e0087421. doi: 10.1128/msphere.00874-21. Epub 2022 Jan 05.

Previously, 1,8-dihydroxynaphthalene (DHN)-melanin was described to protect Aspergillus fumigatus against hydrogen peroxide (H

Synthesis of Spiromamakone A Benzo Analogues via Double Oxa-Michael Addition of 1,8-Dihydroxynaphthalene.

Organic letters

Tsukamoto H, Hanada S, Kumasaka K, Kagaya N, Izumikawa M, Shin-Ya K, Doi T.
PMID: 27648608
Org Lett. 2016 Oct 07;18(19):4848-4851. doi: 10.1021/acs.orglett.6b02328. Epub 2016 Sep 20.

Two benzo analogues of cytotoxic spiromamakone A, comprising carbon atoms with the same oxidation state and unsaturation degree as those of the natural products, are synthesized and biologically evaluated. Substitution of α,α'-dioxoketene dithioacetals, derived from 1,3-cyclopentanediones with protected (2-formylphenyl)magnesium...

Spectrophotometric determination of zirconium with 2-(1-hydroxy-4,6-dinitro-2-phenylazo)-1,8-dihydroxynaphthalene-3,6-disulphonate (picramine ca) as chromogenic reagent.

Talanta

Goyal SS, Tandon JP.
PMID: 18960383
Talanta. 1968 Sep;15(9):895-9. doi: 10.1016/0039-9140(68)80089-x.

The title compound has been used as a selective reagent for the micro-determination of zirconium in acidic medium (0.5MHCl) and found to be better than Picramine R. Spectrophotometric studies show the formation of a 2:1 (ligand:Zr) water-soluble complex and...

A Melanin-like Nanoenzyme for Acute Lung Injury Therapy via Suppressing Oxidative and Endoplasmic Reticulum Stress Response.

Pharmaceutics

Lou XF, Wang C, Zhang JC, Du YZ, Xu XL.
PMID: 34834263
Pharmaceutics. 2021 Nov 03;13(11). doi: 10.3390/pharmaceutics13111850.

Nanoenzyme-mediated catalytic activity is emerging as a novel strategy for reactive oxygen species (ROS) scavenging in acute lung injury (ALI) treatment. However, one of the main hurdles for these metal-containing nanoenzymes is their potential toxicity and single therapeutic mechanism....

Spectrophotometric determination of the total amount of rare-earth elements in agricultural samples with p-chloro-chlorophosphonazo.

Talanta

Li S, Li S, Zhang Y.
PMID: 18965483
Talanta. 1992 Aug;39(8):987-91. doi: 10.1016/0039-9140(92)80283-j.

A simple, sensitive and accurate spectrophotometric method for determination of the total amount of rare-earth elements in agricultural samples with p-chloro-chlorophosphonazo [pCCPA, i.e., 2-(4'-chloro-2'-phosphon-benzylazo)-7-(4''-chlorophenyl)-1,8-dihydroxynaphthalene-3,6-disulphonic acid] in sulphuric acid medium has been developed. The apparent molar absorptivity of RExOy (the...

Spectrophotometric determination of the protolytic dissociation constants of the new chromogenic reagent "PALLADIAZO"-II Study of the protonation processequals, single dot aboves undergone by the azo-groups of the reagent in sulphuric acid media.

Talanta

Pérez-Bustamante JA, Burriel-Martí F.
PMID: 18960935
Talanta. 1971 Jul;18(7):717-32. doi: 10.1016/0039-9140(71)80113-3.

The protonation of the reagent 1,8-dihydroxynaphthalene-3,6-disulphonic-2,7-bis(azophenyl-p-arsonic) acid ("palladiazo") has been investigated by a spectrophotometric method in 0.25-18M sulphuric acid media. Graphical assessment of the experimental results points to the protonation of only one azo-group, although a two-stage protonation process...

Showing 1 to 12 of 20 entries