The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
B W Brooks - One of the best experts on this subject based on the ideXlab platform.
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kinetic studies of aqueous polymerization of acrylic acid initiated using Potassium Bromate sodium metabisulphite redox pair
Polymer International, 1998Co-Authors: B W BrooksAbstract:Aqueous polymerization of acrylic acid was conducted using Potassium Bromate/sodium metabisulphite redox initiators under isothermal conditions. The initial polymerization rates were determined with variation in temperature and in the initial concentrations of acrylic acid, Potassium Bromate and sodium metabisulphite. The effect of pH on polymerization was also investigated. An overall activation energy of 28·62kJmol-1 was obtained over the temperature range 13–43°C. The polymerization is initiated by free radicals and terminated by a combination of monomolecular and bimolecular modes. The cage effect and chain transfer to bisulphite anion are probably both significant. © 1998 SCI.
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Kinetic studies of aqueous polymerization of acrylic acid initiated using Potassium Bromate/sodium metabisulphite redox pair
Polymer International, 1998Co-Authors: Zuifang Liu, B W BrooksAbstract:Aqueous polymerization of acrylic acid was conducted using Potassium Bromate/sodium metabisulphite redox initiators under isothermal conditions. The initial polymerization rates were determined with variation in temperature and in the initial concentrations of acrylic acid, Potassium Bromate and sodium metabisulphite. The effect of pH on polymerization was also investigated. An overall activation energy of 28·62kJmol-1 was obtained over the temperature range 13–43°C. The polymerization is initiated by free radicals and terminated by a combination of monomolecular and bimolecular modes. The cage effect and chain transfer to bisulphite anion are probably both significant. © 1998 SCI.
Zuifang Liu - One of the best experts on this subject based on the ideXlab platform.
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Kinetic studies of aqueous polymerization of acrylic acid initiated using Potassium Bromate/sodium metabisulphite redox pair
Polymer International, 1998Co-Authors: Zuifang Liu, B W BrooksAbstract:Aqueous polymerization of acrylic acid was conducted using Potassium Bromate/sodium metabisulphite redox initiators under isothermal conditions. The initial polymerization rates were determined with variation in temperature and in the initial concentrations of acrylic acid, Potassium Bromate and sodium metabisulphite. The effect of pH on polymerization was also investigated. An overall activation energy of 28·62kJmol-1 was obtained over the temperature range 13–43°C. The polymerization is initiated by free radicals and terminated by a combination of monomolecular and bimolecular modes. The cage effect and chain transfer to bisulphite anion are probably both significant. © 1998 SCI.
R.c. Agu - One of the best experts on this subject based on the ideXlab platform.
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Influence of Potassium Bromate on some malting properties of Nigerian sorghum (sorghum bicolor)
Process Biochemistry, 1995Co-Authors: R.c. AguAbstract:Abstract The effect of various concentrations of Potassium Bromate (a malting additive) was studied on malting sorghum. Potassium Bromate at concentrations of 50–125 mg/litre sprinkled on germinating sorghum (28°C ± 1°C) at steep out increased the filtration rate and cold and hot extract values after four days of germination. There was no significant decrease in malting loss at the low concentrations (50–125 mg/litre) of the additive. A higher dose, of 150 mg/litre, decreased the malting loss, while at a concentration of 125 mg/litre a significant increase was observed for the diastatic power after four days of germination.
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Combined mashing of millet (Pennisetum maiwa) malts prepared with Potassium Bromate and gibberellic acid (GA3) as additives
Process Biochemistry, 1993Co-Authors: R.c. Agu, J.c. EzeanolueAbstract:Abstract Millet, Pennisetum maiwa , was malted using 125 mg/litre Potassium Bromate, 0·20 mg/litre gibberellic acid and a combination of both solutions in equal volumes as additives by sprinkling the solutions at steep out. Germination which lasted for 5 days was carried out at 28°C. Both Potassium Bromate and gibberellic acid improved the values of the parameters analysed, but the influence was more pronounced with malt prepared using Potassium Bromate than with gibberillic acid. The influence of the combined additive on the properties of the wort was lower than those of the respective additives, but it was better than with water control.
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effect of Potassium Bromate on diastase cellulase and hemicellulase development in nigerian malted millet pennisetum maiwa
Process Biochemistry, 1992Co-Authors: R.c. Agu, Benedict C. OkekeAbstract:Abstract The influence of varying concentrations (0–150 mg/litre) of Potassium Bromate on enzyme development in Nigerian millet ( Pennisetum maiwa ) during sprouting and growth was assessed. Optimum diastatic, cellulolytic and hemicellulolytic activities were observed on the fifth day of germination at 28°C when 125 mg/litre of Potassium Bromate was applied.
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Studies on the effect of Potassium Bromate on some malting properties of nigerian millet (Pennisetum maiwa)
Process Biochemistry, 1991Co-Authors: R.c. Agu, Benedict C. OkekeAbstract:Abstract Nigerian millet, Pennisetum maiwa , was malted for 5 days at 28 °C with different concentrations of Potassium Bromate as additive. The cold water and hot water extracts generally increased from the third day to the fifth day for all the concentrations of the additive, with the highest value being obtained when 125 mg/litre was used. The values decreased with higher concentrations of Potassium Bromate. The additive have no significant effect on the diastatic power in the third and fourth days of germination, but a rapid increase was observed on the fifth day when 125 mg/litre of additive was used. The malting loss increased with days of germination but decreased with increased concentration of Potassium Bromate. A concentration of 125 mg/litre of Potassium Bromate after 5 days of germination seemed optimal in the present study.
S. A. Brown - One of the best experts on this subject based on the ideXlab platform.
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Assessment of bread safety in Nigeria: Quantitative determination of Potassium Bromate and lead
African Journal of Food Science, 2010Co-Authors: Martins Emeje, Sabinus I. Ofoefule, A. C. Nnaji, A. U. Ofoefule, S. A. BrownAbstract:Potassium Bromate is an additive widely employed by bread makers to improve bread quality. On account of its deleterious effect and carcinogenicity in humans, certain levels of Potassium Bromate are not allowed in bread. Use of Potassium Bromate in bread is banned in many countries including Nigeria. The present evaluation was carried out in eastern part of Nigeria where consumption of bread is high. Twenty-three different brands of breads were sampled. Quality assessment shows that, all the brands contained Potassium Bromate in a quantity that exceeded the minimum allowed by the FDA. In addition, all the sampled breads contained trace amount of lead, a substance which is harmful to health. On the basis of these, all twenty three bread brands sampled were considered unsafe for human consumption and bread makers should be discouraged from using Potassium Bromate as bread improver. Key words:
Yukiko Morii - One of the best experts on this subject based on the ideXlab platform.
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Polymerization of acrylamide in aqueous medium initiated with a redox system composed of cysteine and Potassium Bromate
Macromolecular Chemistry and Physics, 1997Co-Authors: Takuji Okaya, Kenji Kikuchi, Yukiko MoriiAbstract:Aqueous polymerization of acrylamide initiated with a redox initiator system composed of cysteine and Potassium Bromate was investigated as a model of the redox initiator system composed of poly(vinyl alcohol) having a thiol groups at one end and Potassium Bromate. The rate of polymerization was proportional to almost the square root of cysteine and Potassium Bromate concentration, indicating the initiation system is a usual free radical polymerization initiator. On the other hand, the rate was proportional to the 1.8th power of the monomer concentration. The activation energy of the rate of polymerization was about 5 kcal. mol -1 , indicating also a typical redox initiation system. Chain transfer constant of polyacrylamide radical to cysteine was calculated to be 0.4. From these results, it is concluded that cysteine exerts two important roles: (1) as a reductant of the redox initiation and (2) as a powerful chain transfer reagent.