Acid orang

Vanillin is known to cause allergic reactions in people previously sensiti2ed to balsam of Pern, ben2oic acid, orange peel, cinnamon, and clove, but vanillin itself is not an allergic sensiti2er. 

Alkaline Coupling Process. Orange II [633-96-5] (21) (Cl Acid Orange 7 Cl 15510) a monoazo dye discovered ia 1876, serves as an example of the production of an azo dye by alkaline coupling. A suspension of diazotized sulfanilic acid (0.1 mol) is added to a solution (cooled to about 3°C) of 14.4 g 2-naphthol dissolved ia 15 g 30% sodium hydroxide, 25 g sodium carbonate, and 200 mL of water. The temperature should not be allowed to rise above 5°C. The reaction is heated until solution occurs and the dye is precipitated with 100 g sodium chloride. The mixture is cooled and filtered, and the product is dried. 

With Orange I [574-69-6] (34) (Cl Acid Orange 20 Cl 14600) the naphthalene moiety was iatroduced to azo chemistry. Basacid Red 340 [1658-56-6] (35) (Cl Acid Red 88 Cl 15620) the first red azo dye of technical value was discovered by BASF ia 1876. Its previous name was Fast Red AV and it is stiU produced ia large amounts ia the United States because of its low cost and good dyeiag and fastness properties. This dye became the prototype of a large number of red azo dyes that were developed simultaneously with the iatroduction of new derivatives of naphthalene. 

Of these dyes, Acid Yellow 151 (37) still has the greatest market among the yellows. As reported by USITC, production had increased to 1989 tons in 1985 from 706 tons in 1975. It is produced by coupling diazotized 2-amino-l-phenol-4-sulfonamide to acetoacetanilide followed by metallizing with cobalt to obtain a 1 2 cobalt complex. Acid Orange 24 (38), which is sulfanilic acid coupled to resorcinol to which diazotized mixed xyUdines have been coupled, is an unsymmetrical primary diasazo dye with a bihinctional coupling component. 

Orange B (9) Cl Acid Orange 137 [15139-76-1] 19235 sausage and frankfurter casings or surfaces only 150 ppm max, based on the weight of the finished product... 

Orange RO acid orange 8, l,8-[bis(4-n-propyl-3-sulfopbenyl-l-amino)]antbra-9,10-quinone di-Na salt] [5850-86-2] M 364.4, Cl 15575, Xmax 490nm. Salted out three times with sodium acetate, then repeatedly extracted with EtOH. 

Note The dipping solution, which can also be used as a spray solution, can be employed with silica gel, kieselguhr, cellulose, RP, NH2 and CN phases. Sugars (exceptions include, for example, fructose, melezitose and raffinose) yield brilliantly colored zones on an almost colorless background when the spray solution is employed. Aldohexoses appear brown, aldopentoses bright red and hexuronic acids orange in color [3]. The detection limit differs for different substances it ranges from 10 ng (pyridoxal) over 100 ng (cinnamaldehyde) up to 2 pg (citral). 

Compression-molded devices of poly(N-palmitoyl hydroxyproline ester) (side chain length 16 carbons), poly(N-decanoylhydroxy-proline ester) (side chain length 10 carbons), and poly(JN-hexanoyl-hydrox roline ester) (side chain length 6 carbons) were prepared with dye contents of 1,5,10, and 20% of either -nitroaniline or acid orange. Release curves were obtained by placing the loaded devices into phospate buffer (pH 7.4) at 37 C. The amount of released dye was followed spectrophotometrically in the usual fashion. 

As surfactants are often used in textile processing, it is important to note that anionic or cationic surfactants can inhibit the action of enzymes, as has been reported in the case of cellulases used for the treatment of cotton [140]. Dyes can also inhibit enzyme activity for example, Cl Direct Red 28 has been shown to have a much greater inhibitory effect than Cl Acid Orange 7 [141]. 

Ji, P., Zhang, J., Chen, F., and Anpo, M. (2009) Study of adsorption and degradation of Acid Orange 7 on the surface of Ce02 under visible light irradiation. Applied Catalysis B Environmental, 85 (3-4), 148-154. 

Sastry et al. [42] reported the use of an extractive spectrophotometric method for the determination of primaquine and other antimalarial agents using Fast Green FCF (C.I. Food Green 3) or Orange II (C.I. Acid Orange 7). Sample solution... 

Various industrial sectors related to textiles, paper, and photography use dyes of synthetic origin with a complex aromatic molecular structure, which are frequently discharged in industrial effluents. One solution to these environmental problems is to use oxidative enzymes that destroy colored compounds and that may be of practical interest for the decolorization of synthetic dyes. Enzymes such as LiPX and MnPX are involved in the decolorization of synthetic azo dyes, such as Acid Orange II. 

Aeromonas caviae, Proteus mirabilis, Rhodococcus sp. Acid Orange 7 More than 90% decolorization of the dye was achieved in 16 h [58]... 

Bacillus fusiformis Disperse Blue 79, Acid Orange 10 The dyes were completely mineralized within 48 h [60]... 

Shewanella J18 143 Remazol Black B, Acid Orange 7 Anaerobic cultures of Shewanella strain J18 143 rapidly removed color from the azo dye Remazol Black B in the growth medium to produce an absorbance at 597 nm of less than 1 in under 40 min [86]... 

Dye contaminated soil and sludge Acid Orange-7, yeast extract Consortium consisting of Aeromonas caviae, Proteus mirabilis and Rhodococcus globerulus [58]... 

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