Dab tsi yog txheej txheem ntawm fermentation?
Fermentation yog txheej txheem ntuj tsim thiab nyuaj uas tau siv los ntawm tib neeg rau ntau txhiab xyoo los tsim ntau yam zaub mov thiab dej haus. Nws koom nrog kev hloov pauv ntawm cov khoom siv organic, xws li carbohydrates, rau hauv cov tebchaw yooj yim los ntawm kev ua ntawm cov kab mob. Cov txheej txheem no yog siv dav hauv kev tsim cov khob cij, npias, cawv, cheese, yogurt, thiab ntau lwm yam khoom noj. Nyob rau hauv tsab xov xwm no, peb yuav delve rau hauv lub ntiaj teb fascinating ntawm fermentation thiab tshawb nws txawv theem, hom, thiab kev siv.
Taw qhia rau Fermentation
Fermentation yog txheej txheem anaerobic, uas txhais tau hais tias nws tshwm sim thaum tsis muaj oxygen. Nws yog feem ntau ua los ntawm cov kab mob xws li kab mob, cov poov xab, thiab pwm. Cov kab mob no rhuav tshem cov molecules nyuaj thaum tsis muaj oxygen kom tso tawm lub zog thiab tsim ntau yam khoom siv. Fermentation yog qhov tseem ceeb rau kev ciaj sia ntawm ntau cov kab mob vim nws muab lawv lub zog rau hauv daim ntawv ntawm ATP (adenosine triphosphate).
Cov theem ntawm fermentation
Cov txheej txheem ntawm fermentation tuaj yeem muab faib ua peb theem tseem ceeb: pib, kev loj hlob, thiab kev txiav tawm. Txhua theem ua lub luag haujlwm tseem ceeb hauv cov txheej txheem tag nrho thiab xav tau cov xwm txheej tshwj xeeb rau cov kab mob kom muaj kev vam meej.
1. Kev pib: Cov theem no muaj kev qhia txog cov kab mob mus rau hauv lub substrate, uas yog nruab nrab uas muaj cov organic khoom yuav tsum tau fermented. Cov kab mob no tuaj yeem tshwm sim los yog ntxiv dag zog, xws li hauv rooj plaub ntawm kev ua mov ci lossis brewing npias. Thaum lub sijhawm no, cov kab mob me me pib hloov mus rau ib puag ncig thiab npaj rau theem tom ntej.
2. Kev loj hlob: Thaum cov kab mob kis tau mus rau hauv lub substrate, lawv pib proliferating thiab siv cov khoom muaj nqis. Lawv rhuav tshem cov molecules nyuaj, xws li cov suab thaj thiab cov hmoov txhuv nplej siab, ua cov sib xyaw yooj yim xws li cawv, kua qaub, thiab carbon dioxide. Cov theem no yog tus cwj pwm los ntawm kev ua haujlwm metabolic thiab tso tawm lub zog hauv daim ntawv ntawm ATP.
3. Kev txiav txim: Lub sij hawm txiav tawm yog qhov kawg ntawm cov txheej txheem fermentation. Nws tshwm sim thaum lub substrate yog metabolized kiag li, los yog thaum cov kev mob tsis zoo rau cov kab mob mus txuas ntxiv loj hlob. Lub sijhawm txiav tawm kuj tuaj yeem raug ntxias dag los ntawm kev hloov pauv ib puag ncig, xws li pH, kub, lossis qib oxygen.
Hom Fermentation
Fermentation tuaj yeem muab faib ua ntau hom raws li qhov kawg-cov khoom tsim. Feem ntau hom fermentation muaj xws li:
1. Alcoholic Fermentation: Hom fermentation no feem ntau cuam tshuam nrog kev hloov cov suab thaj, xws li qabzib, rau hauv cawv, feem ntau ethanol, thiab carbon dioxide. Nws yog dav siv hauv kev tsim cov dej cawv xws li npias, cawv, thiab dab. Cov poov xab yog cov kab mob tseem ceeb hauv lub luag haujlwm rau cawv fermentation.
2. Lactic Acid Fermentation: Lactic acid fermentation yog hloov cov suab thaj, feem ntau yog lactose, rau hauv lactic acid. Nws yog feem ntau ua haujlwm hauv kev tsim cov khoom siv mis nyuj xws li yogurt, cheese, thiab qaub cream. Cov kab mob lactic acid, xws li Lactobacillus thiab Streptococcus, yog cov kab mob tseem ceeb koom nrog hauv hom fermentation.
3. Acetic acid fermentation: Acetic acid fermentation, tseem hu ua acetous fermentation, yog kev hloov ntawm ethanol rau hauv acetic acid. Nws yog siv nyob rau hauv zus tau tej cov vinegar. Acetobacter, ib hom kab mob, yog lub luag haujlwm rau cov txheej txheem fermentation no.
4. Propionic Acid Fermentation: Propionic acid fermentation yog tsuas yog siv nyob rau hauv zus tau tej cov Swiss cheese, qhov twg nws pab mus tsim cov yam ntxwv qhov (qhov muag) nyob rau hauv lub cheese. Cov txheej txheem fermentation no suav nrog kev hloov pauv ntawm lactic acid rau hauv propionic acid thiab carbon dioxide. Propionibacterium freudenreichii, kab mob, yog lub luag haujlwm rau qhov fermentation no.
Kev siv ntawm fermentation
Fermentation muaj ntau daim ntawv thov hauv ntau yam lag luam, suav nrog zaub mov thiab dej haus, tshuaj, thiab biofuel ntau lawm. Nov yog qee qhov piv txwv tseem ceeb:
1. Kev lag luam zaub mov thiab dej haus: Fermentation yog dav siv hauv kev tsim cov khoom noj tseem ceeb xws li qhob cij, cheese, yogurt, sauerkraut, kua ntses, thiab pickles. Nws txhim kho qhov tsw, kev ntxhib los mos, thiab khoom noj muaj txiaj ntsig ntawm cov khoom no. Cov dej cawv xws li npias, cawv, thiab champagne cia siab rau fermentation rau lawv cov khoom.
2. Kev lag luam kws tshuaj: Kev lag luam kws tshuaj feem ntau siv fermentation los tsim tshuaj tua kab mob, tshuaj tiv thaiv, thiab kho cov proteins. Microorganisms yog genetic engineered los tsim cov molecules tshwj xeeb los ntawm fermentation, ua rau cov synthesis ntawm cov tshuaj tebchaw ntawm ib tug loj scale.
3. Biofuel Production: Fermentation plays lub luag haujlwm tseem ceeb hauv kev tsim cov biofuels xws li ethanol thiab butanol. Cov kab mob no yog siv los hloov cov ntaub ntawv cog qoob loo, xws li pob kws lossis qab zib, rau hauv biofuels los ntawm fermentation. Qhov kev ua kom ruaj khov no pab txo qis kev vam khom ntawm fossil fuels thiab txo qis cov pa roj carbon monoxide emissions.
4. Kev Tswj Pov Hwm: Fermentation kuj yog siv los tswj cov khoom pov tseg. Nws tuaj yeem ua haujlwm los rhuav tshem cov khoom pov tseg, xws li cov khoom ua liaj ua teb thiab cov khoom noj khoom haus, rau hauv cov khoom muaj txiaj ntsig zoo li biogas (methane) lossis cov chiv organic. Qhov no tsis yog tsuas yog txo cov pov tseg xwb tab sis kuj tseem ua rau lub zog tauj dua tshiab.
Hauv kev xaus, fermentation yog txheej txheem txaus nyiam uas tau siv los ntawm tib neeg rau ntau pua xyoo. Nws yog lub luag haujlwm rau kev tsim khoom ntawm ntau yam khoom noj, dej haus, tshuaj, thiab biofuels. Los ntawm kev nkag siab txog cov theem sib txawv thiab hom fermentation, peb tuaj yeem txaus siab rau lub luag haujlwm tseem ceeb uas nws ua haujlwm hauv ntau qhov kev lag luam thiab nws qhov tseem ceeb hauv peb lub neej niaj hnub. Yog li, lwm zaus koj saj ib daim ntawm cheese los yog txaus siab rau ib khob ntawm caw, nco ntsoov cov txheej txheem intricate fermentation qab nws!