Tus nqi ntawm cov kab mob acetic acid
Tus nqi ntawm cov kab mob acetic acid
Anonim

Ntau tus neeg tsim khoom lag luam tau paub txog qhov xwm txheej thaum, vim huab cua nkag mus rau hauv lub nkoj, ib zaj duab xis tsim rau ntawm qhov dej haus. Cov txheej txheem no ua rau cov saj thiab cov khoom ntawm cov cawv, ua rau nws tsis haum rau kev noj, thiab nws yog provoked los ntawm cov kab mob ntawm acetic acid fermentation. Los ntawm lawv tus kheej, cov kab mob no tsis txaus ntshai thiab ib txwm pom hauv cawv thiab npias, lawv pib ua rau muaj kev phom sij tsuas yog thaum lawv nkag mus rau hauv huab cua.

Cov kab mob acetic fermentation
Cov kab mob acetic fermentation

Tab sis hnub no txawm tias qhov khoom zoo li no tsis zoo heev yog siv los pab tib neeg hauv qee qhov kev lag luam.

Dab tsi yog kab mob

Qhov piv txwv zoo tshaj plaws ntawm kev ua haujlwm ntawm cov kab mob acetic acid yog cov kua dej cawv tsawg. Qhov tshwm sim no tau paub nyob rau hauv ancient sij hawm, tab sis ib tug scientific piav qhia ntawm tus txheej txheem tsuas yog muab nyob rau hauv lub 60s ntawm lub xyoo pua xeem los ntawm Fabkis microbiologist Louis Pasteur. Nws yog nws uas nrhiav tau cov neeg ua hauj lwm ntawm cov tsos ntawm ib tug huab zaj duab xis nyob rau saum npoo ntawm cov cawu cub, uas ua rau nws tig qaub, nyob rau hauv lwm yam lus, tig mus rau hauv vinegar.

Lub ntsiab lus ntawm cov kab mob acetic acid
Lub ntsiab lus ntawm cov kab mob acetic acid

Qhov no yog yam ntxwv ntawm cov dej qab zib tsawg,sab laug hauv cov hlab ntsha qhib tsis tiav nrog kev nkag mus rau huab cua dawb. Raws li kev tshawb fawb ntxiv, nws tau pom tias "cov kab mob vinegar" pom los ntawm kws tshuaj yog qhov tseeb tag nrho cov kab mob ntau yam.

Kev muaj peev xwm ntawm cov kab mob

Acetic acid cov kab mob tau koom nrog hauv cov txheej txheem tsis yog ntawm cov kua txiv hmab txiv ntoo xwb. Lawv muaj peev xwm oxidize cawv xws li ethyl, propyl thiab butyl, tsim los ntawm lawv acetic, propionic thiab butyric acids, feem. Ntawd yog, txhua yam dej haus uas muaj xws li cawv tuaj yeem ua rau lwj vim qhov tseem ceeb ntawm cov kab mob. Tsis txhob ntshai tsuas yog cov kua uas muaj methyl thiab cov cawv ntau dua, vim lawv tsim cov khoom muaj tshuaj lom rau cov kab mob thaum oxidized.

txheej txheem nta

Tus kheej-oxidation ntawm cawv nyob rau hauv tus ntawm cov kab mob acetic acid yog dehydrogenation. Tag nrho cov txheej txheem tuaj yeem nthuav tawm hauv cov qauv tshuaj, qhov twg ethyl cawv tau pib noj, uas tau hloov pauv raws li cov pa oxygen rau hauv acetic acid, dej thiab lub zog tso tawm:

CH3CH2OH + O2=CH 3COOH + H2O + zog

Yog tias muaj cawv ntau dhau ntawm qhov nruab nrab, qhov tshwm sim ntawm cov txheej txheem yuav yog qhov tsim ntawm cov kua qaub thiab tso tawm tsawg kawg ntawm lub zog, uas tsis txaus rau lub neej ntxiv ntawm cov kab mob. Tias yog vim li cas lawv yuav tsum tau oxidize cawv ntau npaum li sai tau, uas coj oxidation los ze zog mus rau lwm yam txheej txheem anaerobic, tab sis cia nws tus kheej nyob rau hauv tej yam ntxwv.

Ntse

Ib yam tshwj xeeb ntawm kev ua ntawm cov kab mob acetic acid yog ib txwm tsim cov yeeb yaj kiab ntawm qhov chaw ntawm substrate.

Lub luag haujlwm ntawm cov kab mob acetic acid
Lub luag haujlwm ntawm cov kab mob acetic acid

Kev ua haujlwm ntawm cov kab mob acetic acid thiab lawv cov khoom nyob ntawm ntau yam kab mob thiab tuaj yeem hloov xim, tuab, lub zog thiab lwm yam ntxwv. Txog rau tam sim no, ntau hom tsiaj ntawm cov aerobes zoo li no twb tau pom lawm. Tag nrho cov ntawm lawv muaj peev xwm muab tau sai heev, tshwj xeeb tshaj yog thaum tiav lawm acetic acid yog ntxiv rau thawj cov kua, uas ua rau kom cov txheej txheem ntawm tau txais vinegar nyob rau hauv ntau lawm. Hauv lub neej, cov kab mob acetic acid muaj nyob hauv huab cua, av, txhua yam khoom fermentation, ntawm cov txiv hmab txiv ntoo thiab txiv hmab txiv ntoo, dej, thiab lwm yam.

External Description

Nyob rau hauv cov xwm txheej zoo, cov hlwb yog luv luv thiab tsis tsim spores. Nyob ntawm lub hnub nyoog, qhov chaw nyob thiab ntau qhov laj thawj thib ob, cov duab thiab qhov loj ntawm cov kab mob tuaj yeem hloov pauv. Cov xwm txheej tsis zoo ua rau cov hlwb loj hlob thiab qee zaum ua cov hnoos qeev. Hauv cov neeg coob, lawv tsim cov hnoos qeev.

Cov kab mob acetic acid
Cov kab mob acetic acid

Kub muaj qhov tshwj xeeb cuam tshuam rau kev ua haujlwm tseem ceeb ntawm cov hlwb. Yog tias nws qhov ntsuas qis dua 15 degrees, tom qab ntawd kev loj hlob yuav qeeb, thiab sab nraud cov kab mob yuav luv thiab tuab. Ntawm qhov taw qhia txog li 34 degrees, ib puag ncig yog suav tias yog qhov zoo tshaj plaws, thiab lub hlwb xav zoo. Nrog kev nce ntxiv, tsim ntau yam deformities hauv daim ntawv yog ua tau.

khoom muaj txiaj ntsig

Ntxiv rau qhov tseeb tias cov haujlwm tseem ceeb ntawm cov kab mobua mob winemaking, muaj ntau cov piv txwv ntawm kev vam meej tib neeg siv cov yam ntxwv ntawm cov kab mob.

Yog li, lub luag haujlwm tseem ceeb ntawm cov kab mob acetic acid tau muab rau hauv kev tsim thiab tsim cov rooj vinegar los ntawm cawv lossis dej cawv. Qhov no ua rau hnub no ua ob txoj hauv kev.

Cov kab mob acetic acid lawv cov khoom
Cov kab mob acetic acid lawv cov khoom

Thawj yog qhov qeeb qeeb tab sis cov txheej txheem ntau dua hu ua Orleans lossis Fab Kis xwb. Rau nws, nws yog ib qhov tsim nyog los npaj wine, yav tas los acidified los yog diluted nrog dej. Muab nws tso rau hauv cov thawv uas npaj ua kom lub ntsej muag ntawm kev sib cuag nrog huab cua yog qhov siab tshaj plaws, thiab tso cov khoom ntawm cov yeeb yaj kiab yav dhau los ntawm Acetobacter orleanense rau hauv cov kua. Nws yog xim daj thiab muaj qhov zoo nkauj zoo nkauj kom cov kua hauv qab pob tshab.

Tom qab qhov kawg ntawm fermentation, ib feem ntawm lub substrate yog ua tib zoo tshem tawm ntawm lub thawv thiab hloov nrog tib tus nqi ntawm diluted caw, tom qab uas cov txheej txheem rov pib dua.

Txoj kev thib ob yog sai dua thiab siv tau rau oxidation ntawm dilute cawv. Ua li no, nws tau dhau los ntawm cov ntim tshwj xeeb nrog beech shavings txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nws, nws raug nquahu kom siv cov khoom sib xyaw tshwj xeeb nrog beech shavings. Nyob rau tib lub sijhawm, cov thawv ntim khoom yuav tsum tau nruab nrog cov hauv qab tsis tseeb nrog lub peev xwm kom dhau huab cua los ntawm lawv. Yog li, cov dej cawv txau nrog cua ntws los ntawm cov chips thiab oxidizes, tom qab ntawd nws tau muab los ntawm lub nkoj los ntawm hauv qab, thiab ib qho tshiab substrate yog ntxiv los ntawm saum toj no.

Dhau li ntawm no, tawb yog siv rau:

  • tso zistxiv apples nrog poov xab;
  • ascorbic acid ntau lawm;
  • cultivating kombucha;
  • Ymaking kefir.

Feem ntau, kev sib xyaw ua ke yog pom nyob rau hauv kev tsim cov khoom lag luam lactic acid kiag li, uas yog, cov kab mob lactic thiab acetic acid ua ke kom pom cov khoom ua kua mis hauv daim ntawv peb tau siv.

Neegative properties

Txawm hais tias qhov txiaj ntsig zoo no, cov kab mob acetic acid kuj ua rau muaj kev phom sij rau qee yam kev lag luam. Yog li, nyob rau hauv winemaking, cov kab mob yog suav hais tias yog pathogenic, txij li thaum lawv muaj peev xwm mus provoke lub fermentation txheej txheem, txawm lub fact tias lawv yuav luag ib txwm pom nyob rau hauv npias thiab cawv. Yuav kom deactivate lawv, dej qab zib yuav tsum tau ua tib zoo kaw los ntawm kev sib cuag nrog huab cua, vim hais tias nws yog tus provokes qhov pib ntawm fermentation. Cov acetic acid tau los ntawm cov kua txiv hmab txiv ntoo ib txwm khaws rau hauv qab, los ntawm qhov chaw uas nws tuaj yeem sau tau, tab sis qhov saj thiab aroma ntawm cov dej haus uas tseem tshuav yuav ua rau lwj mus ib txhis.

Lactic acid thiab acetic acid kab mob
Lactic acid thiab acetic acid kab mob

Yog cov txheej txheem uas tau pib tsis quav ntsej, ces tag nrho cov ntsiab lus ntawm lub thawv yuav tig mus rau hauv cov cawv txiv hmab zoo tib yam.

Ib yam li ntawd, cov kab mob tuaj yeem ua rau cov txiv hmab txiv ntoo qhuav los yog cov zaub nyoos.

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