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Kinetic study of catalase adsorption on disperse carbonaceous matrices

100%
Horozova E., Dimcheva N.
Open Chemistry
|
2004
|
vol. 2
|
issue 4
627-637
EN
The effect of the main factors known to govern the kinetic regularities of enzyme adsorption, such as enzyme solution concentration, temperature, pH, specific surface of the adsorbent, etc., were studied. Two kinds of disperse carbonaceous materials-activated carbon NORIT and carbon black PM-100, were used as matrices for enzyme immobilization. For both immobilization matrices studied, the amount of the adsorbed enzyme was found to reach saturation at catalase (CAT) enzyme concentrations exceeding 20 mg·mL−1 (∼100 μM). The pH of the solution affected the adsorption capacities of the selected immobilization matrices; larger amounts of CAT adsorbed were estimated in neutral and alkaline solutions than under acidic conditions for enzyme immobilization. UV-spectrophotometry was employed as a basic analytical approach in this study.
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Antioxidant Enzyme Mechanism of Cluster Bean (Cyamopsis tetragonaloba (L.) Taub). Under Cobalt Stress

88%
Jayakumar K.
World News of Natural Sciences
|
2019
|
vol. 24
64-70
EN
The research work has been carried out to estimate the low level cobalt application enhance antioxidant enzyme activities of cluster bean plants. The experiments were conducted in earthen pots containing 3 kg of air dried soil. The inner surface of pots was lined with polythene sheet. Cluster bean plants were raised in soil amended with different concentration of cobalt (0, 50, 100, 150, 200 and 250 mg/kg). The antioxidant enzyme activities were analysed at 30, 60, and 90 days after sowing (DAS). There found a significant enhance antioxidant enzyme activities at 50 mg/kg cobalt application in the soil in all the sampling days when compared to control. Further increase in the cobalt level (100-250 mg/kg) in the soil decreased antioxidant enzyme activities of cluster bean plants in all the sampling days.
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