Superoxide Dismutase[2]
Overview
Superoxide Dismutase (SOD) is an enzyme that plays a pivotal role in cellular defense against oxidative stress by catalyzing the conversion of superoxide radicals into less harmful oxygen and hydrogen peroxide. It is found in nearly all aerobic organisms and is critical for mitigating damage caused by reactive oxygen species (ROS). SOD exists in multiple isoforms, including Cu/Zn-SOD (cytoplasmic), Mn-SOD (mitochondrial), and Fe-SOD (bacterial). Each variant has distinct metal cofactors and localization, but all share the common function of protecting cells from oxidative damage. Its applications span medicine, cosmetics, and industrial processes.
Physical and Chemical Properties
SOD is a metalloenzyme with a protein structure that varies by isoform. The Cu/Zn-SOD, for example, is a dimer with copper and zinc ions at its active site, while Mn-SOD and Fe-SOD are typically tetramers. The enzyme is sensitive to pH and temperature, with optimal activity around neutral pH and rapid denaturation above 60°C. Its solubility in aqueous solutions makes it suitable for formulations in liquid or lyophilized forms. The enzyme's activity is measured in units (U), with commercial grades ranging from 3,000 to 10,000 U/mg. Stability is enhanced by lyophilization and storage at low temperatures.
Main Applications
In medicine, SOD is investigated for its anti-inflammatory and neuroprotective effects, particularly in conditions like arthritis and ischemic reperfusion injury. It is also used in topical formulations to reduce UV-induced skin damage. The cosmetics industry leverages SOD's antioxidant properties to combat aging and improve skin elasticity. In food production, SOD extends shelf life by preventing lipid oxidation. Agricultural applications include enhancing crop resistance to environmental stress.
Safety and Storage
SOD is non-toxic and classified as GRAS for specific uses. However, powdered forms may irritate respiratory membranes, requiring handling in ventilated areas. Storage at -20°C in airtight containers preserves activity, with lyophilized forms stable for years under proper conditions. For lab or industrial use, avoid contamination with proteases or heavy metals, which can degrade the enzyme. Reconstituted solutions should be used promptly or stored at 4°C for short-term use.
B2B Procurement Guide
When procuring SOD, prioritize suppliers providing certificates of analysis (CoA) detailing activity, purity (e.g., ≥95%), and endotoxin levels (<0.1 EU/mg for injectables). Bulk purchases may offer cost savings, but verify scalability of production. Consider isoform-specific needs (e.g., Cu/Zn-SOD for cosmetic applications) and whether recombinant (lower cost) or native (higher specificity) forms are required. Lead times vary; specialized grades may require 4-8 weeks for custom production.
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