Lub tshuab ua noj ua hmoov yog feem ntau hu ua cov khoom tshwj xeeb uas siv los ua qee yam khoom zoo nkauj thiab khov. Feem ntau, cov khoom xyaw no yog siv los ua ntau hom khob noom cookie.
Ci cov hmoov ci tau paub kom nce qhov ntim ntawm cov khob noom cookie cov khoom los ntawm kev tso tawm cov roj tshwj xeeb. Feem ntau nws yog hais txog carbon dioxide. Cov hmoov ci ci yog ntxiv rau ua khob noom cookie lossis hmoov nplej. Cov kab mob ua rau cov poov xab sib txawv txawv ntawm cov poov xab. Cov qub tuaj yeem ua haujlwm nyob rau hauv cov khob noom hauv cov qab zib, cov raisins lossis cov txiv ntoo. Hauv qhov no, koj tsis tas yuav tswj kom muaj qhov kub tshwj xeeb.
Feem ntau, qhov sib txawv yog tsim nyob nruab nrab ntawm tus neeg ci cov hmoov thiab cov hmoov ci tshwj xeeb. Kev cais tawm ntawm cov neeg ib leeg suav nrog cov tshuaj sib txuas uas tsim cov pa roj carbon dioxide thaum rhuab. Ammonium phosphates feem ntau tuaj yeem siv los ua kev sib cais. Raws li cov hmoov ci ci txhawj xeeb, feem ntau lawv muaj peb ntu, ib qho yog cov khoom siv roj carbon dioxide. Cov pa nkev tawm los ntawm cov hmoov ci thaum raug cov kub thiab noo noo.
Lwm hom kab mob leavening suav nrog tus neeg ua mov ci ntawm cov poov xab. Cov no yog cov nceb uas muaj peev xwm tso cov pa roj carbon dioxide rau hauv lub khob noom cookie thaum lub sijhawm fermentation. Poov txawv ntawm lwm cov neeg muaj keeb ua rau lawv tso cov tshuaj uas cuam tshuam rau saj ntawm cov zaub mov. Cov tshuaj tua kab mob ua rau muaj txiaj ntsig tshwj xeeb tshaj yog thaum ua mov ci tsis muaj poov xab, muffins thiab lwm yam khoom siv zais cia.
Kev ci dej qab zib yog cov ci hauv nws txoj cai. Ntawm rau caum degrees, nws tawg rau hauv dej, carbon dioxide thiab sodium carbonate. Los ntawm txoj kev, sis dej qab zib nquag tso carbon dioxide thaum sib tham nrog cov kua qaub. Feem ntau ua khob noom cookie muaj acidity tsawg, uas yog tshwm sim los ntawm cov khoom noj siv mis. Yog li txhawm rau txhim kho qhov tshwj xeeb xoob nyhuv, hmoov nplej feem ntau tov nrog citric acid los yog tartaric acid ntxiv rau cov kua.
Tsis zoo li baking sis dej qab zib, ammonium carbonate ntuag tag nrho rau hauv cov khoom muaj roj. Hauv qhov no, tsis muaj cov ntsev ntxhia pob zeb hauv av thiab cov saj ntawm cov ci yuav tsis hloov. Yog li nws pom zoo kom siv nws nyob hauv qhov chaw muab tshuaj lax. Muaj tseeb, ammonium carbonate kuj tseem muaj qhov tsis zoo li kev ruaj khov thaum lub sijhawm ntev cia. Cov hmoov ci no tau pom nyob hauv ntau hom hmoov av ci. Hloov lwm txoj, ci hmoov tuaj yeem npaj los ntawm koj tus kheej.
Baking hmoov siv tshwj xeeb tshaj yog siv rau hauv kev tsim khoom ntawm bakery thiab hmoov nplej, pies, muffins thiab lwm yam khoom ci hauv tsev.
