Tom qab cov nceb dej ntsev khaws cia rau ntau tshaj 3 lub hlis, cov kua qaub zaj duab xis (los yog fungus paj) yuav tshwm sim, txheej txheej ntawm nceb rots thiab tsw, thiab maj mam tig dub, tag nrho cov thoob ntawm nceb yuav waxy daj, kua txiv yog daj thiab. turbid, qaub thiab tsw. , ua rau poob.
(1) Acid zaj duab xis
Muaj ob hom kua qaub zaj duab xis, ib qho yog tawm-dawb los yog creamy daj nrog wrinkled zaj duab xis, uas yog tsim los ntawm kev loj hlob ntawm zaj duab xis-tsim poov xab thiab pseudo-pob poov rau saum npoo ntawm cov ntsev tov; lwm yam yog mis nyuj dawb thiab du
Membrane, uas yog tsim los ntawm hop poov xab. Cov no yog cov kab mob aerobic, ntsev thiab acid resistant microorganisms uas tuaj yeem oxidize qab zib, ethanol, acetic acid, thiab lactic acid los tsim cov pa roj carbon dioxide thiab dej, uas muaj kev cuam tshuam tsis zoo rau cov nceb dej ntsev.
Txhawm rau tswj kev loj hlob ntawm cov kab mob no, muaj ob txoj hauv kev:
1. Sau cov dej ntsev, ntswj lub hau kom nruj kom cais cov huab cua thiab tsim lub xeev tsis muaj oxygen.
2. Cov dej ntsev ntawm cov brine nce siab tshaj 22 Baume, thiab pH poob qis dua 2.5. Koj tuaj yeem ntxiv 0.1 feem pua cov tshuaj tua kab mob (xws li sodium benzoate)
(2) Rotten thiab ntxhiab tsw
Raws li cov nceb nce mus rau saum npoo ntawm cov kua thiab nkag mus rau hauv huab cua, cov kab mob ua rau muaj cov pa phem xws li indole, methyl indole, thiab hydrogen sulfide, uas ua rau lawv tsw ntxhiab. Txoj kev kom kov yeej nws yog siv xyoob curtains mus nias cov nceb hauv qab cov kua dej thiab ua kom cov nceb tawm ntawm cov kua.
(3) Cov nceb maj mam tig dub
Tyrosine tsim los ntawm proteolysis muaj nyob rau hauv cov ntaub so ntswg.
Nyob rau hauv qhov kev txiav txim ntawm tyrosinase nyob rau hauv lub cell, melanin (melanin) yog tsim los ntawm oxidation. Tsis tas li ntawd, kev sib cuam tshuam ntawm cov amino acids thiab txo cov suab thaj hauv cov hlwb tseem yuav tsim cov khoom dub, ua rau cov nceb dub. Txoj kev kov yeej nws yog ntxiv 0.4 feem pua citric acid los kho cov xim daj daj ntawm cov nceb.
(4) Cov nceb tig daj daj, turbid kua txiv, thiab qaub thiab saj. Qhov no tuaj yeem tshwm sim: ib qho yog ntau tshaj fermentation thaum lub sij hawm hloov xim (rau cov txheej txheem thib ob pickling), thiab lwm yam yog tias cov ntsev concentration tsawg dhau thaum lub sij hawm pickling thiab cov kab mob lactic acid, Heterogeneous lactic acid kab mob thiab cov kab mob ua haujlwm. Txoj hauv kev kom kov yeej nws yog ntxiv ntsev thiab pickle hauv lub sijhawm tom qab cov xim hloov, thiab xyuam xim rau kev tshuaj xyuas thaum lub sij hawm cia, thiab tswj nws kom siab tshaj 22 Baume.
