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Superoxide Dismutase (SOD) Detection Kit
Colorimetric  Detection Kit
Key Benefits:
 
  • 100% Inhibition by Super Oxide Dismutase (SOD)
  • Can detect low concentrations of SOD
  • Highly water-soluble formazan dye.
  • Applications: colorimetric detection.
Introduction:
       Superoxide dismutase (SOD) are metalloenzymes that catalyze the dismutation of superoxide radical into hydrogen peroxide (H2O2) + molecular oxygen (O2) and consequently provide an important defense mechanism against superoxide radical toxicity (1).
       Oxidative stress dependent upon superoxide radical can account for a number of acute and chronic disease states, which include inflammation and ischemia-reperfusion (2,3). SOD protects murine peritoneal macrophages from apoptosis induces by adriamycine (4). Furthermore, over expression of SOD in fibrosarcome cells, protects against apoptosis and promotes cell differentiation (5). 
Assay Principle:
To determine SOD activity, several direct and indirect methods have been developed. A common and convenient indirect method utilizes nitroblue tetrazolium (NBT) conversion to NBT-diformazan (formazan dye) via superoxide radical. However, there are several disadvantages to the NBT method, such as poor water solubility of the formazan dye and the interaction with the reduced form of xanthine oxidase. Though cytochrome C is also commonly used for SOD activity detection, its reactivity with superoxide is too high to determine low levels of SOD activity.

Cell Technology’s SOD kit utilizes a water-soluble tetrazolium salt, WST-1 (2-(4-Iodophenyl)- 3-(4-nitrophenyl)-5-(2,4-disulfophenyl)- 2H-tetrazolium, monosodium salt) that produces a highly water-soluble formazan dye upon reduction with a superoxide anion (6). The rate of the reduction with O2.- is linearly related to the xanthine oxidase (XO) activity, and is inhibited by SOD, as shown in Figure 1. Therefore, the IC 50 (50% inhibition activity of SOD or SOD-like materials) can be determined by this colorimetric method. Absorbance can be measured at 440nm.

SOD Inhibition Curve

Figure 1 - Inhibition Curve Prepared Using SOD from Bovine Liver

SOD Assay Kit-WST

Figure 2 -  SOD ASSAY Reaction

The following kits are available:
Catalog 
 
Contents Size Price
CSOD 100-2
 
See Below* 100 Tests  €225