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P-Methyl red

The uniformity of these hyperbranched PAA grafts on PE films was studied by forming derivatives with visible and fluorescent dyes. These hyperbranched films were modified by treating an activated 3-PAA/PE film with an amine terminated p-methyl red dye (MR) 9 or with a dansyl amine 10 to form MR/3-PAA/PE or dansyl/3-PAA/PE films, respectively. Visual inspection under a light or fluorescence microscope showed that the methyl red-labeled and fluorescently labeled films were uniform in color and fluorescence. The methyl red/3-PAA/PE film derivafive showed a responsive color change wifh change in pH. The MR labeled 3-PAA/PE film was red after immersion in an acidic ethanol solution and yellow after treatment with a basic ethanol solution. [Pg.21]

The hetero-dimerization behavior of dye-modified -cyclodextrins with native CDs was investigated by means of absorption and induced circular dichroism spectroscopy in aqueous solution [43], Three types of azo dye-modified /i-CDs show different association behavior, depending on the positional difference and the electronic character of substituent connected to the CD unit in the dye moiety. p-Methyl Red-modified fi-CD (1), which has a 4-(dimethylamino)azobenzene moiety connected to the CD unit at the 4 position by an amido linkage, forms an intramolecular self-complex, inserting the dye moiety in its / -CD cavity (Figure 13). 1 also associates with native a-CD by inserting the dye residue into the a-CD cavity. The association constants for such hetero-dimerization are 198 M"1 at pH 1.00 and 305 M 1 at pH 6.59, which are larger than the association constants of 1 for / -CD (43 M 1 at pH 1.00). [Pg.211]

Z -> E isomerization of 4-dimethylamino-azobenzene and its o - and p -carboxylated derivatives (o- and p-methyl red) in the alkaline realm, with a warning about the interpretation of results when the rate of isomerization is measured in organized media if the pH is not appropriately controlled, ... [Pg.30]

Electrochemical indication makes use either of redox labels, which are bound chemically to DNA strands, or of redox active intercalators . The latter are flat molecules able to intercalate the windings of DNA helix. It has been shown, that the well known, commercially available fluorescence quenching agent dabcyl (p-methyl red) is useful also for hybridisation detection with heated electrodes [51]. It was found that osmium tetroxide in different forms is a most powerful redox label for hybridisation detection, especially at heated electrodes [42, 52-55]. OSO4 has been used as bipyridyl complex and also botmd to a heated gold electrode surface via thiol bridges. [Pg.111]

Cresol red Crystal Violet Malachite Green Methanil Yellow Thymol Blue Orange IV -2,4-Dinitrophenol -Erythrosin, Na2 salt -Dimethyl Yellow Cl 11020 Bromophenol Blue Congo Red Cl 22120 Methyl Orange Bromocresol Green Alizarin Red S Cl 42750 Methyl Red Cl 13020 -Bromocresol Purple Chlorophenol Red p-Nitrophenol Alizarin Bromothymol Blue Brillant Yellow Phenol Red Neutral Red Cl 50040 -m-NItrophenol -Cresol Red Metacresol Purple Phenolphthalein -Thymolphthalein -P-Naphthyl Violet Alizarin Yellow R 2,4,6-T rinitrotoluene... [Pg.200]

Methyl -propyl ketone, 340 Methyl pyridines, purification of, 177-179 N-Methylpyrrole, 837, 838 Methyl red, 621, 625 sodium salt of, 626 Methyl salicylate, 780,782 Methyl sulphite, 304 2-Methylthiophene, 836 Methyl p-toluenesulphonate, 825 Methylurea, 968, 969 Methylene bromide, 300 Methylene chloride, purification of, 176 3 4-Methylenedioxycinnamic acid, 711, 719... [Pg.1180]

Equivalent e point Methyl red cl color in this p ranges H range. ... [Pg.685]

Method II. P ipette 25 ml sample in 400 ml beaker. Add 50 ml distd w and 4-5 drops of methyl red indicator. If the soln is alkaline, neutralize it with N/10 HNO,. Titrate with std Na sulfite soln (prepd by dissolving 18g of CP anhyd NaaSO, in a mixt of 900 ml distd w and 100 mi methanol or ethanoi and stored in the dark) to faint, but definite yel end-point. The wh ppt forming during the titration is an aid in observing the end-point... [Pg.565]

Oxidation of toluene-o-sulphonamide to saccharin. In a 600-ml beaker, mounted on an electric hot plate and provided with a mechanical stirrer, place 12 g (0.07 mol) of toluene-o-sulphonamide, 200 ml of water and 3g of pure sodium hydroxide. Stir the mixture and warm to 34-40 °C until nearly all has passed into solution (about 30 minutes). Introduce 19g (0.32 mol) of finely powdered potassium permanganate in small portions at intervals of 10-15 minutes into the well-stirred liquid. At first the permanganate is rapidly reduced, but towards the end of the reaction complete reduction of the permanganate is not attained. The addition occupies 4 hours. Continue the stirring for a further 2-3 hours, and then allow the mixture to stand overnight. Filter off the precipitated manganese dioxide at the pump and decolourise the filtrate by the addition of a little sodium metabisulphite solution. Exactly neutralise the solution with dilute hydrochloric acid (use methyl orange or methyl red as external indicator). Filter off any o-sulphonamidobenzoic acid (and/or toluene-o-sulphonamide) which separates at this point. Treat the filtrate with concentrated hydrochloric acid until the precipitation of the saccharin is complete. Cool, filter at the pump and wash with a little cold water. Recrystallise from hot water. The yield of pure saccharin, m.p. 228 °C, is 7.5 g (58%). [Pg.881]

Heat over a free flame or an electric heater until the solution has attained a clear blue color and the walls of the flask are free from carbonized material. Cautiously add 20 mL of water, cool, then add through a funnel 30 mL of a 2 5 solution of sodium hydroxide, and rinse the funnel with 10 mL of water. Connect the flask to a steam distillation apparatus, and immediately begin the distillation with steam. Collect the distillate in 15 mL of a 1 25 solution of boric acid to which has been added 3 drops of methyl red-methylene blue TS and enough water to cover the end of the condensing tube. Continue passing the steam until 80 to 100 mL of distillate has been collected, then remove the absorption flask, rinse the end of the condenser tube with a small quantity of water, and titrate with 0.01 N sulfuric acid. Each milliliter of 0.01 N acid is equivalent to 140 p.g of nitrogen. [Pg.889]

EJAcidity. Dissolve a 100 g sample in 400 ml of distd w, filter and titrate the filtrate with N/lONaOH soln using methyl red indicator. Run a blank detn on the same amt of distd w and methyl red. Calc acidity as %-age of nitric acid (Ref 8, p 4)... [Pg.371]

SYNS C.1.13020 C.I. ACID RED 2 p-piMETHYLAMINO)AZOBENZENE-o-CARBOXYLIC ACID 4 -DIMETHYLAMIN0AZ0BENZENE-2-CARBOXYLIC ACID o-((p-(DIMETHYLAMINO)-PHENYL)AZ0)BENZ0IC ACID 2-((4-DIMETHYL-AiMINO)PHENYLAZO)BENZOIC ACID METHYL RED... [Pg.292]


See other pages where P-Methyl red is mentioned: [Pg.233]    [Pg.528]    [Pg.147]    [Pg.212]    [Pg.233]    [Pg.528]    [Pg.147]    [Pg.212]    [Pg.261]    [Pg.626]    [Pg.824]    [Pg.1193]    [Pg.76]    [Pg.216]    [Pg.1308]    [Pg.626]    [Pg.824]    [Pg.9]    [Pg.363]    [Pg.241]    [Pg.303]    [Pg.371]    [Pg.626]    [Pg.824]    [Pg.779]    [Pg.553]    [Pg.303]    [Pg.371]    [Pg.2340]    [Pg.179]    [Pg.528]    [Pg.32]    [Pg.1219]    [Pg.303]    [Pg.371]    [Pg.76]   
See also in sourсe #XX -- [ Pg.147 ]




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Methyl red

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