Txhawm rau txhawm rau ua kom lub neej txee thiab khaws cov khoom noj kom zoo, kev lag luam ntim tau hloov mus rau qhov ntsiag to tab sis muaj zog tus neeg saib xyuas: cov ntawv ntim oxygen absorber. Cov hnab me me no ua lub luag haujlwm tseem ceeb hauv kev tawm tsam ob qho kev ua txhaum ntawm cov zaub mov tsis zoo: pwm kev loj hlob thiab oxidation- ua rau lwj, ua kom cov khoom xws li nplej, pastries, nqaij qhuav, thiab txuj lom mus txog cov neeg siv khoom zoo. Kev nkag siab txog yuav ua li cas cov absorbers no ua haujlwm, technically thiab xyaum, yog qhov tseem ceeb rau cov neeg tsim khoom thiab cov neeg siv khoom.
Molecular oxygen yog tus antagonist loj hauv kev sib ntaus sib tua rau kev khaws zaub mov. Thaum cov pa oxygen muaj nyob rau hauv cov khoom ntim khoom noj, nws ua rau muaj ntau yam kev puas tsuaj uas txo cov txee lub neej. Rau qhov pib, nws txhawb kev loj hlob ntawm cov kab mob aerobic xws li pwm thiab kab mob, uas ua rau cov pa oxygen- nplua nuj thiab tuaj yeem ua rau cov zaub mov tsis zoo. Qhov thib ob, oxygen txhawb cov tshuaj tiv thaiv xws li roj rancidity, vitamin tawg, thiab pigment oxidation, uas ua rau tsis kaj siab tsw, as-ham poob, thiab discoloration. Piv txwv li, cov vitamins tuaj yeem degrade, thiab cov xim ci ntsa iab ntawm ntau cov zaub mov qhuav yuav ploj mus. Ib txwm hoover ntim minimises, tab sis tsis eradicate, residual oxygen. Qhov no yog thaum cov pa oxygen absorbers nkag mus rau hauv qhov sib txawv tseem ceeb.
Oxygen absorber packets, tseem hu ua scavengers, yog tsim los ntawm cov khoom xyaw uas muaj tshuaj lom neeg thiab cov pa oxygen dawb nyob rau hauv ib lub hnab ntim khoom noj. Daim ntawv nquag thiab siv tau zoo tshaj plaws yog ua raws cov hmoov hlau, qee zaum hu ua hlau -raws li deoxidiser. Thaum muab ntim rau hauv ib lub pob, cov hmoov hlau pib cov tshuaj tiv thaiv oxidation sai, siv cov pa oxygen thiab tsim cov hlau oxide (xeb). Cov tshuaj tiv thaiv no ua tau zoo heev, thiab nws tuaj yeem txo qis cov pa oxygen hauv lub thawv ntim. Qhov tseeb, cov hlau niaj hnub no-raws li absorbers tuaj yeem txo cov pa oxygen kom tsawg dua 0.01% nyob rau lub sijhawm luv luv, ua rau thiab txhawb nqa qhov ze ntawm -zoo meej, ntev -lub sij hawm oxygen-dawb. Lub absorber tam sim ntawd tshem tawm oxygen, uas yuav tsum tau rau pwm spores kom germinate thiab aerobic spoilage kab mob kom loj hlob. Yog li ntawd, qhov pib ntawm pwm thiab microbial spoilage yog txo qis.
Ntxiv nrog rau kev tiv thaiv kev puas tsuaj lom, cov pob ntawv no tiv thaiv cov tshuaj lom neeg thiab kev ntseeg siab ntawm cov zaub mov. Lawv pab khaws cov khoom qub saj, aroma, thiab xim los ntawm kev khaws cov pa oxygen nyob ib puag ncig - dawb. Piv txwv li, oxidation, uas ua rau cov txiv ntoo kom tau rancid lossis hmoov sib tov kom poob lawv cov txiaj ntsig, yog qhov zoo. Qhov tseem ceeb, cov scavengers no khiav ntawm nws tus kheej ntawm cov zaub mov nws tus kheej, thiab vim hais tias lawv nyob rau hauv ib tug ntxeem tau tab sis ruaj ntseg pob ntawv, tsis muaj peev xwm ntawm cov active tshuaj yuav kis tau cov khoom noj, kom zoo meej kev nyab xeeb rau noj.
Txawm hais tias hlau-raws li cov tshuab tseem ceeb, thev naus laus zis muaj ntau haiv neeg. Lwm cov ntaub ntawv pov tseg muaj xws li cov tshuab enzymatic xws li qabzib oxidase. Qhov no enzyme catalyses lub oxidation ntawm qabzib nyob rau hauv lub xub ntiag ntawm oxygen, ua rau gluconic acid thiab hydrogen peroxide. Lwm cov enzyme, catalase, rhuav tshem cov kev puas tsuaj hydrogen peroxide rau hauv dej thiab oxygen, ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv kev puas tsuaj oxidative. Cov txheej txheem enzymatic no qhia txog biochemistry siab heev uas yuav siv tau los khaws zaub mov. Hauv kev siv cov tswv yim, cov pa oxygen absorbers yog tsim los ua ntau yam thiab sib xws nrog ntau hom kev ntim khoom, nrog rau cov hnab me me rau cov neeg siv khoom, PET lub raj mis, cov tais yas, yas corks, thiab cov yeeb yaj kiab rau dej haus thiab lwm yam khoom noj.
Rau cov neeg tsim khoom noj khoom haus qhuav, koom nrog cov pa oxygen absorbers rau hauv lawv lub tswv yim ntim khoom yog ib qho kev nqis peev zoo hauv cov khoom zoo thiab kev nyab xeeb. Lawv muab cov txiaj ntsig zoo, qis -ko taw taw, thiab tus nqi- daws teeb meem zoo rau qhov teeb meem tsis tu ncua. Qhov kawg tshwm sim yog lub neej txee ntev dua uas txo qis cov khoom noj pov tseg, txhim kho lub koob npe nrov los ntawm kev xa cov khoom zoo ib yam, thiab ua kom cov neeg siv khoom xav tau ntau ntxiv rau kev huv huv - cov txheej txheem khaws cia.
Hauv cov ntsiab lus, cov pob ntawv oxygen absorber yog ib qho tseem ceeb ntawm cov khoom noj qhuav qhuav niaj hnub. Lawv siv cov chemistry yooj yim tab sis muaj zog, xws li hlau oxidation cov tshuaj tiv thaiv lossis cov txheej txheem enzymatic siab heev, los tsim kom muaj kev sib haum xeeb rau cov kab mob spoilage xws li pwm thiab tiv thaiv kev puas tsuaj oxidation. Cov pob ntawv yooj yim no muab kev tiv thaiv zoo heev, ua kom lub ntsej muag ntawm lub cracker nrog rau qhov tsw ntawm cov taum kas fes hwm. Raws li kev lag luam khoom noj siv zog ua kom muaj kev ruaj khov thiab zoo dua qub, kev siv cov pa oxygen- nqus cov cuab yeej tseem ceeb heev los xyuas kom meej tias cov khoom noj qhuav tsis yog tsuas yog muaj kev nyab xeeb thiab ntev- kav ntev, tab sis kuj qab thiab noj qab haus huv los ntawm kev ntim khoom rau pantry txee.
