2 edition of Studies on auxochromic derivatives of diphenylhexatriene. found in the catalog.
Studies on auxochromic derivatives of diphenylhexatriene.
I. D. Johnson
PhD thesis, Biochemistry.
The mechanism of gelatine staining with four selected fluorone derivative dyes (eosin y, ethyl eosin, methyl eosin, uranin) was investigated. Gelatine films were stained in dye-buffer-ethanol solutions at varying pH and in the presence of NaCl and urea. Dye binding was recorded spectrophotometrically. Ionization constants of auxochromic phenolic groups were determined from pH-absorbance curves. W. M. McClain, Excited state symmetry assignment through polarized two-photon absorption studies of fluids, J. Chem. Phys. 55, – (). Google Scholar
• Glycosated (sugar) derivatives of anthocyanidin • 6 anthocyanidins and anthocyanins identified in plants • Shade changes with –OH /-OCH3 substitution (auxochromic effect) • Significant effect of pH on colour Images: Ananga et al “Production of Anthocyanins in Grape Cell ultures” in “The Mediterranean Genetic Code -. In the most general terms, the concept of membrane fluidity comprises a number of the motional characteristics of membrane components. It includes the translational and rotational motions of proteins.
Recently, synthesis, photophysical and photochemical study of some new furan and benzofuran derivatives have been realized [21,27 28 In the case of 2,3-distyryl benzofurans 1 (Scheme 1. Fluorescence properties of two new potential antitumoral tetracyclic thieno[3,2-b]pyridine derivatives were studied in solution and in liposomes of DPPC (dipalmitoyl phosphatidylcholine), egg lecithin (phosphatidylcholine from egg yolk; Egg-PC) and DODAB (dioctadecyldimethylammonium bromide). Compound 1, pyrido[2',3':3,2]thieno[4,5-d]pyrido[1,2-a]pyrimidinone, exhibits reasonably .
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The average membrane location of a series of diphenylhexatriene (DPH)-derived membrane probes was analyzed by measuring the quenching of DPH fluorescence with a series of nitroxide-labeled lipids in which the depth of the nitroxide group is varied.
All DPH derivatives were located deeply within the bilayer. Some derivatives were anchored at a shallower depth than free Cited by: Studies on auxochromic derivatives of diphenylhexatriene Author: Johnson, I. Awarding Body: University of Salford Current Institution: University of Salford Date of Award: Availability of Full Text.
Abstract. We have utilized both fluorescent and nitroxide derivatives of stearic acid as probes of membrane structural heterogeneity in phospholipid vesicles under physiological conditions, as well as conditions of varying ionic strengths and temperatures where spectral heterogeneity has been previously observed and attributed to multiple ionization states of the by: 5.
Planar 1-(2-hydroxyphenyl)pyrazole derivatives presented a strong hydrogen bond between the OH group and the nitrogen. The 2-methoxy analogue was twisted (92JA).The importance of an intramolecular hydrogen bond was also revealed in 1-pyridylaminopyrazoles.
1-pyridylpyrazole and 1-(3′ or 4′-pyridyl)aminopyrazoles were nonplanar while in 1-(2′-pyridyl)aminopyrazole. The use of diphenylhexatriene (DPH) quenching to study the permeation of phloretin through red cell and phosphatidylcholine (PC) iiposome membranes.
In the upper trace, nM diphenylhexa- triene was equilibrated with a solution of human red blood cells at a % final by: CONTROL OF INTERACTIONS OF 9-AMINO ACRIDINE DERIVATIVES WITH BEEF HEART SUBMITOCHONDRIAL MEMBRANES.
, DOI: /B William R. Veatch, Lubert Stryer. Effect of cholesterol on the rotational mobility of diphenylhexatriene in liposomes: A nanosecond fluorescence anisotropy study. 1. Introduction. In the model membranes, the effect of cholesterol on phosphatidylcholine bilayers has a long standing problem, to know (i) what is the effect of cholesterol on the main phase transition of pure phosphatidylcholine bilayers.
The main phase transition at T m is the transition which takes the bilayer from a crystalline solid (gel) phase with conformationally ordered acyl chains. Fluorescence spectroscopic studies on the multicomponent system coumarin 1/fluorescein/rhodamine B in ethanol.
Pihong Zhao, Silvio Rodriguez Article OriginalPaper. Three-photon-induced fluorescence of diphenylhexatriene in solvents and lipid bilayers.
Henryk Malak 5-substituted derivatives of l,3,5-triarylpyrazoline. Bile salt DPPC vesicle fluorescence anisotropy 1,6-diphenylhexatriene This is a preview of subscription content, log in to Effect of sodium deoxycholate and sodium cholate on DPPC vesicles: A fluorescence anisotropy study with diphenylhexatriene.
of diphenylhexatriene (DPH) as a tool. It was found that the variation of r ss is sensitive enough to monitor different stages. The synthesis of methylene blue typically involves the oxidative preparation of a quinoneimine from two aniline derivatives.
If one of the aromatic rings contains suitable sulfur functionality adjacent to the quinine bridge, cyclisation to the phenothiazine system is possible, and further oxidation leads to the coloured phenothiazinium chromophore, as shown in Fig.
The spectral locations of the low energy triplet-triplet (T-T) and singlet-singlet (S-S) maxima of coumarin, 6-methyl, 7-methoxy, 7-hydroxy, 7-hydroxymethyl, 7-aminomethyl, 7-ethylamino-4,6-dimethyl, 7-dimethylaminomethyl, 7-diethylaminomethyl coumarin, coumarin and LD were spectral location of the fluorescence maxima of all the auxochromic.
The presence of a phenyl group in a compound can be ascertained with a fair degree of certainty from its infrared spectrum.
For example, in Figure we see the infrared spectra of methylbenzene, and of 1,2- 1,3- and 1,4-dimethylbenzene. That each spectrum is of a benzene derivative is apparent from certain common features. Bilayer interaction and localization of cell penetrating peptides with model membranes: A comparative study of a human calcitonin (hCT)-derived peptide with pVEC and pAntp(43–58).
Biochimica et Biophysica Acta (BBA) - Biomembranes, DOI: / The synthesis of conjugated hydrocarbons that display interesting fluorescence properties remains an important area of research.
For example, compounds such as diphenylhexatriene (DPH, 1), DiSC 3+ (5) (2), and CTMPA (3) (Figure 1), play key roles as fluorescent probes in biological studies. 1 Of these, DPH is exceptionally noteworthy as it can be utilized in an array of applications, such as.
The synthesized thiazolidinone derivatives exhibiting antimicrobial properties and possessing several auxochromic and chromophoric groups reactive with synthetic (cellulose) and natural (protein) fabrics tempted us to evaluate their dyeing potentials with silk, wool, cotton, and polyester fabrics with simultaneous antimicrobial finishing of the.
Root decoctions of anthraquinone-containing plants are often taken as postpartum tonic and aphrodisiac. Anthraquinones are known for their diverse biological activities, especially antioxidant and anticancer. A series of 35 anthraquinones was generated by isolation from Rubiaceae plants and synthesis.
Their UV/vis spectrum depends on the nature and relative positions of auxochromic. Download Citation | [2+2] Photodimerization and photopolymerization of diphenylhexatriene crystals utilizing perfluorophenyl–phenyl stacking interactions | Irradiation of the crystal of 1.
Iioka H, Moriyama I, Akazaki M, Oku M, Itoh K, Hino K, Okamura Y, Itani Y, Katoh Y, Ichijo M. [The study on human placental DHA-S transport mechanism (using placental microvillous membrane vesicles)]. Nihon Sanka Fujinka Gakkai Zasshi. Oct; 39 (10)– Overall, a few interesting and ingenious approaches toward ‘total synthesis’ of chlorins were proposed, reaching total yields on the level of %.
Some derivatives with auxochromic groups were prepared, which allowed the study of the relationship between structure and spectroscopic properties. Temperature-dependence studies of the fluorescence polarization of diphenylhexatriene and anthroylstearate demonstrate a phase transition in microvillus membranes and in liposomes prepared from their lipid extracts at approximately 26+/-2 degrees C.
Ambient pH influences markedly the diphenylhexatriene fluorescence polarization in microvillus. Complex formation of two calixarene derivatives - containing two ethoxycarbonylmethoxy groups or a bridge including two carboxamide moieties in the coordination sphere - with aliphatic amines.This probe could not be used satisfactorily with intact cells, because it did not present any specificity for a particular type of membrane and labelled all the hydrophobic regions of the cell.
We have recently focussed our attention on the cationic derivative of DPH, trimethylamino-diphenylhexatriene .In the present study, we report the interaction of this antibiotic labelled at its amine group with 7-nitrobenzoxa-1,3-diazole (NBD-Nys) with sterol-free and ergosterol- and cholesterol.