Cov pa oxygen absorbents yog cov tshuaj lom neeg uas tuaj yeem tshem tawm cov pa oxygen los ntawm qhov chaw nyob ib puag ncig, thiab tau siv dav hauv kev khaws zaub mov, chaw muag tshuaj, kev tiv thaiv hluav taws xob, thiab kev txuag kev coj noj coj ua. Lawv lub hauv paus ntsiab lus tseem ceeb yog hloov cov pa oxygen hauv ib puag ncig mus rau hauv cov tebchaw ruaj khov los ntawm cov tshuaj tiv thaiv tshuaj, yog li txo cov pa oxygen concentration thiab ncua cov tshuaj tiv thaiv oxidation.
Tam sim no, cov txheej txheem tseem ceeb ntawm cov pa oxygen absorbent yog ua raws li cov txheej txheem tshuaj xws li hlau -raws li sulfite, thiab ascorbic acid. Ntawm cov no, hlau -raws li cov pa oxygen absorbents feem ntau thiab tus nqi - xaiv tau zoo. Lawv txoj hauv kev ua haujlwm suav nrog cov hmoov hlau ua haujlwm nrog cov pa oxygen hauv qhov chaw ntub dej kom tsim xeb (Fe₂O₃·nH₂O), yog li siv cov pa oxygen. Qhov zoo ntawm cov qauv no yog cov tshuaj tiv thaiv siab thiab tus nqi qis, tab sis nws yuav tsum muaj qee qhov av noo thiab tuaj yeem tsim cov khoom seem tom qab cov tshuaj tiv thaiv. Txhawm rau txhim kho kev ua tau zoo, cov hlau niaj hnub-raws li cov khoom nqus dej feem ntau ntxiv cov khoom siv xws li sodium chloride thiab cov pa roj carbon activated los txhim kho cov tshuaj tiv thaiv thiab kev nqus pa oxygen.
Sulfite-raws li oxygen absorbers react nrog oxygen ntawm sodium sulfite (Na₂SO₃) los yog sodium metabisulfite (Na₂S₂O₅) los tsim sulfates. Txoj kev no yog tsim rau ib puag ncig rhiab rau hlau corrosion, tab sis cov khoom siv tshuaj tiv thaiv yuav cuam tshuam rau kev ruaj ntseg ntawm qee cov khoom. Ascorbic acid (vitamin C) systems siv lawv cov khoom txo kom hnov mob ncaj qha nrog oxygen, ua rau lawv tsim nyog rau cov ntim khoom noj, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig uas yuav tsum tau nruj me ntsis rau cov tshuaj residues.
Hais txog kev siv tshuab, txoj kev encapsulation ntawm oxygen absorbers yog qhov tseem ceeb. Feem ntau, cov khoom siv zaj duab xis ua tsis taus pa tab sis tsis muaj dej tsis muaj dej (xws li polyethylene lossis polypropylene) yog siv los ntim cov khoom nqus dej, kom ntseeg tau tias cov pa tuaj yeem nkag tau thaum cov khoom ya raws thiab cov tshuaj tiv thaiv tsis xau. Tsis tas li ntawd, qee cov khoom siv siab- kawg siv ntau- txheej cov ntaub ntawv sib xyaw kom tswj tau cov pa nqus pa thiab txuas ntxiv lub voj voog tiv thaiv.
Nyob rau hauv xyoo tas los no, cov kws tshawb fawb kuj tau tsim cov thev naus laus zis tshiab oxygen nqus raws li cov enzyme catalysis lossis photocatalysis, xws li cov piam thaj oxidase system, uas tuaj yeem tshem tawm cov pa oxygen hauv qhov mob me me, tab sis nws cov nqi siab tau txwv nws cov ntawv thov dav. Nyob rau hauv lub neej yav tom ntej, nrog rau kev nce qib hauv cov ntaub ntawv tshawb fawb, cov pa oxygen absorbers yuav txhim kho mus rau kev ua tau zoo dua, kev phooj ywg ib puag ncig, thiab kev tswj kom tau raws li kev lag luam thiab kev xav tau ntawm pej xeem.
