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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]
The 3 substrates of this enzyme are peptidylglycine, ascorbate, and O 2, whereas its 3 products are peptidyl(2-hydroxyglycine), dehydroascorbate, and H 2 O. This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need ...
A scavenger in chemistry is a chemical substance added to a mixture in order to remove or de-activate impurities and unwanted reaction products, for example oxygen, to make sure that they will not cause any unfavorable reactions. Their use is wide-ranged:
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 some species that synthesize ascorbate in the liver (including mammals and perching birds), the glucose is extracted from glycogen; ascorbate synthesis is a glycogenolysis-dependent process. [66] In humans and in animals that cannot synthesize vitamin C, the enzyme l -gulonolactone oxidase (GULO), which catalyzes the last step in the ...
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 .
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.