Qhov sib txawv tseem ceeb ntawm methyl paraben thiab propyl paraben yog tias methyl paraben tsis muaj tshuaj lom tsawg dua piv rau propyl paraben.
Methyl paraben thiab propyl paraben yog cov khoom xyaw tseem ceeb uas siv rau hauv kev tsim cov khoom kom zoo nkauj. Txawm li cas los xij, cov khoom xyaw no tuaj yeem ua rau qee yam tshuaj lom rau ntawm daim tawv nqaij thiab tuaj yeem ua rau qee qhov tawv nqaij khaus. Propylparaben yog tshuaj lom me ntsis piv rau methylparaben.
YMethyl Paraben yog dab tsi?
Methyl paraben lossis methylparaben yog ib hom tshuaj paraben uas muaj cov tshuaj formula CH3(C6H4 (OH)COO). Nws yog ib qho tseem ceeb preservative thiab yog methyl ester ntawm p-hydroxybenzoic acid. Qhov nyiam IUPAC lub npe ntawm cov tshuaj no yog methyl 4-hydroxybenzoate. Nws cov molar loj yog 152.15 g / mol, thiab nws tshwm sim raws li cov xim tsis muaj xim lossis dawb crystalline hmoov.
Ntxiv mus, methylparaben tuaj yeem ua pheromone rau cov kab sib txawv. Nws kuj yog ib feem ntawm poj huab tais mandibular pheromone. Ntxiv mus, no pheromone yog tsim nyob rau hauv hma thaum lub sij hawm estrus txuam nrog tus cwj pwm ntawm alpha txiv neej hma. Qhov no tiv thaiv lwm tus txiv neej los ntawm mounting poj niam nyob rau hauv tshav kub.
Dhau li ntawm, methyl paraben tuaj yeem ua tus neeg sawv cev tiv thaiv kab mob uas feem ntau muaj txiaj ntsig zoo hauv ntau yam tshuaj pleev ib ce thiab cov khoom tu tus kheej. Tsis tas li ntawd, nws tseem muaj txiaj ntsig zoo li cov khoom noj khoom haus nrog tus lej E E218. Qee cov tshuaj paraben muaj xws li ethylparaben, propylparaben, thiab butylparaben.
Vim nws cov haujlwm tiv thaiv kab mob, peb tuaj yeem siv methyl paraben ua cov tshuaj tua kab mob rau Drosophila zaub mov ntawm 0.1%. Cov tshuaj no yog tshuaj lom rau Drosophila thaum nws tshwm sim hauv ntau dua. Nws tuaj yeem ua rau cov nyhuv estrogenic uas ua rau cov tshuaj estrogen hauv cov nas thiab muaj cov tshuaj tiv thaiv androgenic. Tsis tas li ntawd, nws tuaj yeem txo qis qhov kev loj hlob ntawm cov menyuam yaus thiab cov menyuam yaus theem ntawm 0.2%.
Feem ntau, methylparaben tau nkag mus rau hauv plab hnyuv. Nws tuaj yeem nqus tau los ntawm daim tawv nqaij thiab. Tom qab ntawd, cov tshuaj no tau txais hydrolyzed rau p-hydroxybenzoic acid. Tom qab ntawd nws tau tawm sai sai hauv cov zis thiab tsis sib sau hauv lub cev. Yog li ntawd, cov kev tshawb fawb hais txog mob toxicity tshwm sim los ntawm methyl paraben lub xeev tias methyl paraben yog xyaum tsis muaj tshuaj lom los ntawm qhov ncauj los yog parenteral tswj nyob rau hauv cov tsiaj.
YPropyl Paraben yog dab tsi?
Propyl paraben yog hom tshuaj paraben uas muaj cov tshuaj formula C10H12O3. Cov molar loj ntawm cov khoom no yog 180.2 g / mol. Qhov ceev ntawm propyl paraben yog 1.06 g / cm3,thiab nws cov ntsiab lus melting ntawm 96 txog 99 degrees Celsius. Peb tuaj yeem hu ua propyl paraben hauv IUPAC nomenclature li propyl 4-hydroxybenzoate. Nws yog n-propyl ester ntawm p-hydroxybenzoic acid. Nws tshwm sim nyob rau hauv cov nroj tsuag thiab ib co kab. Txawm li cas los xij, nws tuaj yeem tsim khoom siv hluavtaws los siv rau hauv kev lag luam tshuaj pleev ib ce, kev lag luam tshuaj, thiab kev lag luam khoom noj. Qhov no yog vim nws tuaj yeem ua raws li kev khaws cia rau ntau yam khoom.
Cov propyl paraben compound muaj cov tshuaj tiv thaiv kab mob thiab cov tshuaj tua kab mob thiab tuaj yeem siv tau ntau yam tshuaj pleev ib ce dej thiab cov khoom tu tus kheej vim cov cuab yeej no. Ntxiv mus, peb tuaj yeem siv cov tshuaj no ua cov khoom noj ntxiv, thiab nws muaj tus lej E E216. Tsis tas li ntawd, propyl paraben yog tus qauv tshuaj ua xua, thiab nws yog ib qho tseem ceeb hauv kev sim tshuaj allergenic.
Dab tsi zoo sib xws ntawm Methyl Paraben thiab Propyl Paraben?
- Methyl paraben thiab propyl paraben yog cov tshuaj paraben.
- Ob leeg siv los ua cov khoom xyaw hauv cov tshuaj pleev ib ce thiab cov khoom tu tus kheej.
- Lawv tseem ceeb ua cov tshuaj tiv thaiv kab mob thiab tshuaj tua kab mob.
- Ob leeg yog siv hauv kev lag luam khoom noj ua khoom noj.
Qhov txawv ntawm Methyl Paraben thiab Propyl Paraben yog dab tsi?
Methyl paraben thiab propyl paraben yog cov tshuaj tseem ceeb uas tuaj yeem siv los tsim cov tshuaj pleev ib ce thiab lwm yam khoom siv tu tus kheej. Qhov sib txawv tseem ceeb ntawm methyl paraben thiab propyl paraben yog tias methylparaben tsis muaj tshuaj lom dua li propylparaben.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm methyl paraben thiab propyl paraben hauv daim ntawv tabular rau kev sib piv ntawm ib sab..
Summary – Methyl Paraben vs Propyl Paraben
Methylparaben los yog methylparaben yog ib hom tshuaj paraben uas muaj cov tshuaj formula CH3(C6H4 (OH)COO). Propylparaben yog ib hom paraben uas muaj cov tshuaj formula C10H12O3 Qhov sib txawv tseem ceeb ntawm methyl Paraben thiab propyl paraben yog tias methylparaben tsis muaj tshuaj lom dua li propylparaben.
