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Oxygen scavengers or oxygen absorbers are added to enclosed packaging to help remove or decrease the level of oxygen in the package. They are used to help maintain product safety and extend shelf life. [1] There are many types of oxygen absorbers available to cover a wide array of applications. [2] [3]
Most lower pressure systems (lower than 650 psi (4,500 kPa)) use non-volatile treatment programs. The most commonly used oxygen scavenger for lower pressure systems is sodium sulfite (Na 2 SO 3). It is very effective and rapidly reacts with traces of oxygen to form sodium sulfate (Na 2 SO 4) which is non-scaling. Most higher pressure systems ...
In molecular laser isotope separation, methane is used as a scavenger gas for fluorine atoms. Hydrazine and ascorbic acid are used as oxygen scavenger corrosion inhibitors. Tocopherol and naringenin are bioactive free radical scavengers that act as antioxidants; synthetic catalytic scavengers are their synthetic counterparts
Sodium erythorbate is produced from sugars derived from different sources, such as beets, sugarcane, and corn.These sugars are converted to ordinary D-glucose.[10] [11] [12] The glucose is converted to a 2-keto sugar acid intermediate, most commonly 2-keto-D-gluconic acid, by Pseudomonas fluorescens bacteria.
It is a volatile oxygen scavenger [2] [3] and reacts in a ratio of 2.8/1 DEHA/O2. It is employed in high pressure (>70 bar) boiler systems due to a very low rate of reaction at low temperatures and pressures. Due to its volatility, it acts as an oxygen scavenger throughout the entire boiler system due to steam carryover.
Ascorbate peroxidase (or L-ascorbate peroxidase, APX or APEX) (EC 1.11.1.11) is an enzyme that catalyzes the chemical reaction. L-ascorbate + H 2 O 2 dehydroascorbate + 2 H 2 O. It is a member of the family of heme-containing peroxidases.
In enzymology, a L-ascorbate oxidase (EC 1.10.3.3) is an enzyme that catalyzes the chemical reaction 2 L-ascorbate + O 2 ⇌ {\displaystyle \rightleftharpoons } 2 dehydroascorbate + 2 H 2 O Thus, the two substrates of this enzyme are L- ascorbate and O 2 , whereas its two products are dehydroascorbate and H 2 O .
Ascorbate 2,3-dioxygenase (EC 1.13.11.13) is an enzyme that catalyzes the chemical reaction ascorbate + O 2 + H 2 O ⇌ {\displaystyle \rightleftharpoons } oxalate + threonate The 3 substrates of this enzyme are ascorbate , oxygen , and water , whereas its two products are oxalate and threonate .
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