Qhov sib txawv tseem ceeb ntawm cov kab mob homofermentative thiab heterofermentative yog cov kab mob homofermentative yog ib hom kab mob lactic acid uas tsim cov lactic acid tsuas yog cov khoom lag luam hauv cov piam thaj fermentation, thaum cov kab mob heterofermentative yog hom kab mob lactic acid. tsim ethanol/acetic acid thiab CO 2 lwm yam tsis yog lactic acid raws li cov khoom lag luam hauv qabzib fermentation.
Cov kab mob Lactic acid (LAB) muaj nyob hauv kev lag luam mis nyuj. Cov kab mob lactic acid tsim cov lactic acid ua cov khoom tseem ceeb ntawm cov piam thaj fermentation. Lawv yog gram-zoo thiab qws los yog cocci zoo li tus. Cov kab mob no tiv taus cov pH tsawg dua li lwm cov kab mob uas cuam tshuam nrog kev lag luam mis nyuj. Lawv feem ntau siv nyob rau hauv cov kab lis kev cai pib thiab cov khoom noj fermentation. Cov kab mob lactic acid ua rau cov kua mis qaub. Ntxiv mus, cov kab mob no raug cais raws li homofermentative thiab heterofermentative kab mob raws li lawv cov khoom los ntawm cov khoom qab zib fermentation.
Homofermentative Bacteria yog dab tsi?
Cov kab mob Homofermentative yog ib hom kab mob lactic acid uas tsim cov lactic acid nkaus xwb uas yog cov khoom lag luam tseem ceeb hauv cov piam thaj fermentation. Hauv biochemistry, cov kab mob homofermentative hloov cov piam thaj molecules rau hauv ob lub lactic acid molecules. Lawv siv cov tshuaj tiv thaiv no los ua ob lub ATP molecules los ntawm substrate-theem phosphorylation. Homofermentative kab mob muaj xws li Lactococcus hom, uas yog siv nyob rau hauv cov mis nyuj pib kab lis kev cai kom sai-ua lactic acid nyob rau hauv txo pH tej yam kev mob. Hauv kev lag luam khoom noj siv mis, Lactococcus hom tuaj yeem siv rau hauv cov kab lis kev cai ib leeg lossis hauv cov kab lis kev cai sib xyaw nrog lwm cov kab mob lactic acid xws li Lactobacillus thiab Streptococcus.
Daim duab 01: Homofermentative Bacteria
Homofermentative Bacteria Produce
Lactococcus hom feem ntau yog siv los ua cov khoom noj siv mis fermented xws li cheeses. Txawm li cas los xij, lub xeev homofermentative ntawm Lactococcus tuaj yeem hloov kho los ntawm kev hloov pauv ib puag ncig xws li pH, qabzib concentration thiab kev txwv tsis pub noj. Thermophilic strains ntawm Lactobacillus helveticus kuj tseem siv rau hauv kev tsim cheese. Cov kab mob homofermentative siv hauv kev lag luam yogurt muaj xws li Lactobacillus delbruckii, Lactobacillus acidophilus thiab Streptococcus salivarius. Tsis tas li ntawd, Sterptococcus spp., Enterococcus, Pediococcus, thiab Aerococcus yog lwm cov kab mob homofermentative siv hauv kev lag luam mis nyuj, tab sis lawv tsis tshua siv los ua kab lis kev cai pib.
Cov kab mob Heterofermentative yog dab tsi?
Cov kab mob Heterofermentative yog ib hom kab mob lactic acid uas tsim ethanol / acetic acid thiab CO 2ntxiv rau lactic acid raws li cov khoom lag luam hauv qabzib fermentation. Hauv cov kab mob heterofermentative, tsis yog cov lactic acid ua cov khoom tseem ceeb kawg, ib qho tseem ceeb ntawm ib lossis ntau cov metabolites (ethanol / acetic acid, CO 2) kuj tsim nyob rau hauv cov piam thaj fermentation. Hauv biochemistry, cov kab mob heterofermentative tsim ib qho lactic acid thiab ib qho ATP, ua ke nrog CO2 hauv qabzib fermentation. Tab sis lawv kuj yuav tsim tau ob peb lwm yam khoom kawg xws li ethanol, acetic acid, propionic acid, acetaldehyde, los yog diacetyl.
Daim duab 02: Heterofermentative Bacteria
Kev kuaj cov kab mob heterofermentative cuam tshuam nrog kev kuaj pom CO 2 roj. Txawm hais tias lawv tsis tshua muaj tshwm sim hauv kev lag luam mis nyuj thiab mis nyuj, lawv tsis tshua siv los ua cov kab lis kev cai pib hauv kev lag luam mis nyuj. Qee zaum, yog tias lawv tso cai rau kev loj hlob ntawm tus lej tseem ceeb, cov kab mob heterofermentative tuaj yeem ua rau muaj qhov tsis xws luag xws li slits hauv cov cheese nyuaj thiab ntim ntim hauv lwm cov khoom siv mis nyuj. Cov kab mob heterofermentative muaj xws li Leuconostoc spp., Lactobacillus brevis, Lactobacillus fermentum, Lactobacillus reuteri, Lactobacillus plantarium, Lactobacillus casei, thiab Lactobacillus curvatus.
Dab tsi zoo sib xws ntawm Homofermentative thiab Heterofermentative Bacteria?
- Homofermentative thiab heterofermentative kab mob yog hom kab mob lactic acid.
- Ob leeg yog gram-zoo thiab pas nrig lossis cocci zoo li.
- Lawv tsim lactic acid hauv qabzib fermentation.
- Lawv tsim ATP hauv qabzib fermentation.
- Ob leeg siv rau hauv kev lag luam mis nyuj.
Qhov txawv ntawm Homofermentative thiab Heterofermentative Bacteria yog dab tsi?
Cov kab mob Homofermentative yog ib hom kab mob lactic acid uas tsim cov lactic acid nkaus xwb uas yog cov khoom lag luam tseem ceeb hauv cov piam thaj fermentation. Ntawm qhov tod tes, cov kab mob heterofermentative yog ib hom kab mob lactic acid uas tsim ethanol / acetic acid thiab CO 2lwm yam tsis yog lactic acid raws li cov khoom lag luam hauv qabzib fermentation. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm homofermentative thiab heterofermentative kab mob. Ntxiv mus, cov kab mob homofermentative feem ntau yog siv los ua kab lis kev cai pib hauv kev lag luam mis nyuj. Hauv qhov sib piv, cov kab mob heterofermentative tsis tshua siv los ua kab lis kev cai pib hauv kev lag luam mis nyuj.
Cov lus qhia hauv qab no qhia txog qhov sib txawv ntawm homofermentative thiab heterofermentative kab mob hauv daim ntawv tabular.
Summary – Homofermentative vs Heterofermentative Bacteria
Lactic acid bacteria (LAB) yog ib pawg ntawm cov kab mob heterogeneous uas ua lub luag haujlwm tseem ceeb hauv ntau yam txheej txheem fermentation. Lawv ferment carbohydrates nyob rau hauv cov zaub mov thiab tsim lactic acid raws li lub ntsiab by-product. Cov kab mob no tau muab cais ua homofermentative thiab heterofermentative kab mob raws li lawv cov khoom los ntawm cov khoom qab zib fermentation. Cov kab mob homofermentative yog ib hom kab mob lactic acid uas tsim cov lactic acid nkaus xwb los ntawm cov khoom lag luam hauv qabzib fermentation. Ntawm qhov tod tes, cov kab mob heterofermentative yog ib hom kab mob lactic acid uas tsim ethanol / acetic acid thiab CO 2lwm yam tsis yog lactic acid li cov khoom lag luam hauv qabzib fermentation. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm homofermentative thiab heterofermentative kab mob.
