Preservation time and relative rectification factor of hydroquinone,tert-butyl hydroquinone and 2,5-di-tert-butyl hydroquinone were determined. The recoveries are 100.3%,98.2%and 101.8% respectively.
Objective To investigate the protective effect of tert-butylhydroquinone (tBHQ) on cytotoxicity to bone marrow cells induced by benzene in vitro with comet assay.
For instance, three food-antioxidants (i.e. propy gallate (PG), 2,4,5-trihydroxybutyryl benzene (THBP) and tert-butylhydroquinone (TBHQ)) are determined simultaneously by this method satisfactorily.
Most of the chemical additives previously used in food were synthetic phenolic compounds, such as tert-Butylhydroquinone(TBHQ), Butylated hydroxyanisole(BHA), Butylated hydroxtoluene (BHT) and Tocopherol (AH2) and so on.
Preservation time and relative rectification factor of hydroquinone,tert-butyl hydroquinone and 2,5-di-tert-butyl hydroquinone were determined. The recoveries are 100.3%,98.2%and 101.8% respectively.
Objective To investigate the protective effect of tert-butylhydroquinone (tBHQ) on cytotoxicity to bone marrow cells induced by benzene in vitro with comet assay.
For instance, three food-antioxidants (i.e. propy gallate (PG), 2,4,5-trihydroxybutyryl benzene (THBP) and tert-butylhydroquinone (TBHQ)) are determined simultaneously by this method satisfactorily.
Most of the chemical additives previously used in food were synthetic phenolic compounds, such as tert-Butylhydroquinone(TBHQ), Butylated hydroxyanisole(BHA), Butylated hydroxtoluene (BHT) and Tocopherol (AH2) and so on.
The six antioxidants were butylated hydroxyanisol (BHA), butylated hydroxytoluene (BHT), tert-butyl hydroquinone (TBHQ), tocophenol (VE), tea polyphenol (TPP) and lycopene (LP). It was shown that the antioxidant effect on DG product was as follows: TBHQ>TPP>LP>BHT>VE>BHA.
Analogous processes accompany redox transformations of 2,6-di-tert-butylhydroquinone, 2,6-diphenyl-para-benzoquinone, and 2,4,6-tri-tert-butylphenol adsorbed on silica gel.
Addition of tert-butylhydroquinone, a compound which generates reactive oxygen species through redox cycling, also reduced expression of the NADH-cytochrome b5 reductase.
It is found that the catalytic activity correlates well with the amount of medium-strong acid sites on the surface of the catalysts, and the selectivity towards 2-tert-Butylhydroquinone has some connection with the pore size of the catalysts.
tert Butylhydroquinone (TBHQ) and higher alcohols were used to synthesize a derivative of THBQ——2 teriary butyl 5 octadecyl 1,4 hydroquionone(DTBHQ).Its melting point is 147.5-149.5 ℃ and LD 50 is 4000 mg/kg.DTBHQ has good heat resistance and obvious antioxygenic activity.Its antioxygenic activity is stronger than BHA,BHT,TBHQ and V\-E.After adding DTBHQ,the oxidation stability of lard increased 6.46(100 ℃),4.13(120 ℃) and 1.71(140 ℃) times when w (DTBHQ)=0.02%,and 9.20(100 ℃),...
The titled compound was synthesized from hydroquinone and tert-butanol under catalysis of solid acid. The effects such as reaction time,reaction temperature, and solvents on the yield of tert-butylhydroquinone were also examined. In mixed organic solvents,the selectivity of tert-butylhydro-quinone was higher than that reported in the literature. Because of its high selectivity and mild condi-tions, this method is useful for preparing tert-butylhydroquinone and is promisin...
Synthesis of 2,5di tert butylhydroquinone by alkylation of hydroquinone with methyl tert butyl ether (MTBE) was studied. The effects of reaction time, reaction temperature and solvents on the yield of 2,5di tertbutylhydroquinone were also investigated. Under the optimum conditions: the reaction temperature about 80 ℃, the reaction time 7~8 h, n(MTBE)∶n(hydroquinone)=3∶1, m(catalyst)∶m(hydroquinone)=0.6∶1, the content of 2,5ditertbutylhydroquinone in the product reached 91.9%. ...