Octyl hydroquinone

Quinones and Hydroqulnones. In the analysis of quin-ones and hydroqulnones, the use of two different dual detector systems was required. The retention data for hydroqulnones shows the normal behavior of hydroxyl groups associating with the solvent, THF. Thus octyl quinone and hydroquinone elute almost together. Similarly dioctylquinone and octyl hydroquinone elute together (Figure 7). The UV/RI response ratio for benzoquinone is 3.75. Hydroquinone and dioctylquinone show similar disparities in the UV/RI responses. This information provides a very good method for detecting impurities in dioctyl hydroquinone. 

Figure 7. Gel permeation chromatograms with dual detectors. Key top, dioctyl quinone ind bottom, octyl hydroquinone.

Antioxidants form only a minor group of cosmetic allergens. Examples are propyl gallate, octyl gallate,66 which may cross-react with other gallates and are also used as food additives, and t-butyl hydroquinone, a well-known allergen in the United Kingdom but not in continental Europe.2... 

The activity of the 2-alkylhydroquinones (la), 2,5-dialkyl-hydroquinones (lb), 2,6-dialkylhydroquinones (Ila), and of 2,5- and 2,6-dialkyl-4-alkoxyphenols (Ic and lib) was studied in isotactic polypropylene at 180 0.1° C. The values obtained were correlated with hydroquinone (Ari) and pyro-catechol (AT2). All compounds studied (la) except the tert-octyl derivative were inferior in activity to hydroquinone. Two alkyls of Types lb and Ha exerted further but nonadditive unfavorable effects, particularly the lb type. Despite over-all low values of Ari, a weak favorable steric effect of the tert-alkyls is apparent in Type la compounds. Etherification even as acetylation of one hydroxyl group (Ic, lib), has a strong favorable effect. These compounds were the most active antioxidants of the entire hydroquinone series studied nevertheless their activity did not reach that of pyrocatechol (At2 < 1). 

Phenol, styrenated antioxidant, ABS polymers Octyl diphenyl phosphite antioxidant, acetal resins N-(p-Ethoxycarbonylphenyl)-N -ethyl-N-phenylformamidine antioxidant, acrylic coatings Octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate antioxidant, acrylic food packaging Hydroquinone monomethyl ether Octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate Resorcinol benzoate antioxidant, acrylics Drometrizole Triisooctyl phosphite antioxidant, acrylics, ABS 2,2 -Methylenebis (4-ethyl-6-t-butylphenol) antioxidant, acrylonitrile Distearyl thiodipropionate antioxidant, adhesives... 

BHT 2,6-DI-t-butylphenol Hydroquinone monomethyl ether 2,2 -Methylenebis (6-t-butyl-4-methylphenol) 3-Naphthol Pentaerythrltyl tetrakis [3-(3, 5 -di-t-butyl-4-hydroxyphenyl) propionate] 2,6-Xylenol antioxidant, oils/fats Octyl gallate... 

Octyl phenol-formaldehyde resin 8. 2,5-di-/et7-amyl hydroquinone 5 1... 

Since pyrethrins are highly photolytic, antioxidants are often added to preparations to stabilize formulations antioxidants adjoin include pyrocatechol, pyrogal-lol, hydroquinone, and l-benzene-azo-2-naphthol. Practically, all pyrethrins and many pyrethroids are commonly combined to additives (including synergists), some formulations include additional insecticides, insect repellents, or both, and many contain hydrocarbon solvents [3] to enhance their insecticidal activity. Pyrethrin and pyrethroid sprays may also be water based or be alcohol or petroleum based, which increases the overall toxicity. It is known that concomitant use of pyrethrins and pyrethroids with synergists such as piperonyl butoxide, A -octyl bicycloheptene dicarboximide, sulfoxide, sesamin, sesame oil, sesamolin, isosafrole, and organophosphorus compounds or carbamates may increase toxicity by mechanisms involving inhibition of microsomal oxidation [4]. 

Other widely used type of food additives is the synthetic antioxidant group in which compounds such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), tertiary butyl hydroquinone (TBHQ), 2,4,5-trihydroxybutyrophenone (THBP), di-tertbutyl-4-hydroxymethylphenol (IONOX-100), propyl gallate (PG), octyl gallate (OG), nordihydroguaiaretic acid (NDGA), 4-hexylresorcinol (4HR), 2-naphthol (2NL), 4-phenylphenol (OPP), and 2,4-dichlorophenoxyacetic acid (2,4-DA) are included. 

Ascorbyl palmitate, benzylparaben, BHA, BHT, butylparaben, di-t-butyl hydroquinone, dodecyl gallate, ethylparaben, methylparaben, octyl gallate, propyl gallate, propylparaben, sorbic acid, t-butyl hydroquinone, tocopheryl acetate, triclosan Preservatives and antioxidants... 

Ionic Nature Nonionic Uses Lubricant, emuisifier for textiies Methoxy-PEG-7 rutinyl succinate Definition Ester of methoxy PEG-7 and rutinyl succinate Uses Surfactant in cosmetics, toners, and astringents Manuf/Distrib. Somerset Cosmetic Co. Variati 4-Methoxyphenol p-Methoxyphenol. See Hydroquinone monomethyl ether 3-(4-Methoxyphenyl)-2-propenoic acid, 2-ethylhexyl ester. See Octyl methoxy-cinnamate... 

Phenolic phosphate See Phenyl acid phosphate Phenol, liquefied. See Phenol Phenol, 4-methoxy-. See Hydroquinone monomethyl ether Phenol, p-nonyl-. See p-Nonyl phenol Phenol, octyl Phenol, (1,1,3,3-tetramethylbutyl)-. See Octylphenol Phenol, 4-(1,1,3,3-tetramethylbutyl)-, polymer with formaldehyde and oxirane See Tyloxapol... 

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