Qhov sib txawv tseem ceeb ntawm citric acid thiab ascorbic acid yog tias ascorbic acid yog cov tshuaj nquag hauv qhov peb noj li vitamin C whereas citric acid yog siv hauv cov ntsiav tshuaj vitamin C tsuas yog muab cov saj.
Citric acid thiab ascorbic acid yog cov organic tebchaw, uas tuaj yeem ua cov kua qaub. Organic acids tseem ceeb muaj hydrogen thiab carbon nrog rau lwm yam. Lwm cov organic acids feem ntau yog acetic acid, formic acid, lactic acid, thiab lwm yam. Cov kua qaub no muaj ib pawg -COOH. Yog li ntawd, lawv tuaj yeem ua raws li cov neeg pub dawb proton. Ob qho tib si citric acid thiab ascorbic acid tshwm sim hauv cov txiv hmab txiv ntoo citrus, yog li muaj kev tsis sib haum xeeb ntawm ob. Txawm li cas los xij, lawv yog ob lub molecules txawv kiag li.
Citric Acid yog dab tsi?
Citric acid yog cov organic acid uas muaj nyob hauv cov txiv hmab txiv ntoo citrus. Piv txwv li, txiv qaub, txiv qaub, txiv kab ntxwv yog citrus txiv hmab txiv ntoo. Ib qho tshwj xeeb rau tag nrho cov txiv hmab txiv ntoo no yog lawv cov qaub saj, thiab citric acid yog lav ris rau qhov no. Raws li tus nqi tam sim no, cov kua qaub sib txawv ntawm txiv hmab txiv ntoo mus rau txiv hmab txiv ntoo.
Tsis tas li, cov kua qaub no muaj nyob hauv qee cov zaub. Qhov no yog ib qho tsis muaj zog acid txheeb ze rau cov inorganic acids xws li HCl los yog sulfuric acid, nrog rau cov tshuaj formula C6H8O7Nws zoo nkaus li dawb crystalline khoom, thiab thaum kev daws teeb meem hauv cov kua, nws ua raws li tus neeg pub dawb. Tsis tas li ntawd, nws yog soluble hauv dej. Citric acid muaj peb pawg -COOH, yog li ntawd, qhia cov khoom ntawm lwm cov carboxylic acids. Piv txwv li, thaum cua sov, nws decomposes los ntawm muab carbon dioxide thiab dej. Piv nrog rau lwm cov carboxylic acids, citric acid muaj zog dua vim tias cov anion tuaj yeem ruaj khov los ntawm kev sib koom ua ke ntawm intramolecular hydrogen.
Daim duab 01: Cov qauv kab ntawm Citric Acid
Ntawm ntau qhov kev siv, peb siv citric acid txhua hnub ua zaub mov ntxiv. Nws ntxiv tsw rau cov dej qab zib. Cov kua qaub no yog ib qho tshuaj ntxuav zoo. Yog li, nws muaj txiaj ntsig zoo rau cov khoom siv tu thiab cov khoom zoo nkauj. Lwm qhov laj thawj ntawm kev siv citric acid hauv cov khoom ntawm daim tawv nqaij yog nws lub peev xwm los ua antioxidant.
Ntxiv mus, citric acid yog ib tus neeg ua haujlwm zoo. Nws tuaj yeem khi nrog cov hlau thiab cov ntxhia. Yog li nws pab lub cev nqus thiab zom lawv yooj yim dua. Tsis tas li ntawd, cov kua qaub no yog qhov nruab nrab hauv lub voj voog citric acid; yog li ntawd, nws yog molecule nyob rau hauv tag nrho cov muaj sia.
YAscorbic Acid yog dab tsi?
Ascorbic acid kuj yog cov organic acid uas tshwm sim. L-ascorbic acid tseem hu ua vitamin C, thiab qhov no yog ib qho tseem ceeb rau tib neeg. Nws muaj cov mis mos molecular ntawm C6H8O6 Qhov no yog xim dawb tab sis qee zaum yuav tshwm hauv xim daj me ntsis thiab.
Daim duab 02: Cyclic Structure of Ascorbic Acid
Ascorbic acid yog soluble hauv dej thiab lwm yam polar organic solvents. Thaum ib tug xoob proton los ntawm ib pawg hydroxyl bonded rau vinyl carbon, lub molecule stabilizes los ntawm resonance stabilization. Qhov kev ruaj ntseg ntawm deprotonated conjugate puag ntawm ascorbic acid ua rau nws acidic ntau dua li lwm pawg hydroxyl. Ntxiv mus, ascorbic acid yog ib qho antioxidant zoo li citric acid.
Qhov txawv ntawm Citric Acid thiab Ascorbic Acid yog dab tsi?
Citric acid yog cov organic acid uas muaj nyob rau hauv cov txiv hmab txiv ntoo citrus thaum ascorbic acid yog cov organic acid uas peb hu ua vitamin C. Qhov sib txawv tseem ceeb ntawm citric acid thiab ascorbic acid yog ascorbic acid yog cov tshuaj nquag hauv qhov peb tau noj li vitamin C whereas citric acid yog siv hauv cov tshuaj vitamin C tsuas yog muab cov saj. Ntxiv mus, Ascorbic acid muaj cov qauv cyclic, tab sis citric acid muaj cov qauv linear.
Raws li lwm qhov sib txawv tseem ceeb ntawm citric acid thiab ascorbic acid, peb tuaj yeem hais tias citric acid muaj peb pawg carboxyl, thiab lawv tuaj yeem pub cov protons thaum ua cov kua qaub, tab sis hauv ascorbic acid, tsis muaj -COOH pawg. (yog tias lub nplhaib qhib tuaj yeem muaj -COOH). Kev pub dawb proton yog los ntawm pawg hydroxyl hauv cov molecule. Tsis tas li ntawd, ib qho sib txawv ntawm citric acid thiab ascorbic acid yog tias, nyob rau hauv citric acid, lub deprotonated ion yog stabilized los ntawm intramolecular hydrogen bonding whereas, nyob rau hauv ascorbic acid, lub deprotonated molecule yog stabilized los ntawm resonance..
Summary – Citric Acid vs Ascorbic Acid
Vitamin C ntsiav tshuaj muaj qaub saj; Qhov no tsis yog vim muaj ascorbic acid, tab sis vim yog citric acid. Yog li ntawd, qhov sib txawv tseem ceeb ntawm citric acid thiab ascorbic acid yog ascorbic acid yog cov khoom siv nyob rau hauv qhov uas peb noj li vitamin C whereas citric acid yog siv nyob rau hauv vitamin C ntsiav tshuaj tsuas yog muab cov saj.
