Ethyl-p-hydroxybenzoate
CAS Nr.: 120-47-8
Lub cev thiab tshuaj muaj zog
Tsis muaj xim, zoo siv lead ua los yog crystalline hmoov, yuav luag tsis muaj ntxhiab, me ntsis astringent, ruaj khov rau lub teeb thiab kub, tsis muaj hygroscopicity, melting point 115 ~ 118 degree. Insoluble hauv dej (0.001g/100ml), soluble hauv propylene glycol thiab txiv laum huab xeeb.
Toxicological hauv paus
① LD50: mob qhov ncauj 5g / kg (BW) hauv nas.
② ADI: 0 ~ 10 mg/kg (BW) ( xam los ntawm tag nrho cov nyiaj ntawm methyl p-hydroxybenzoate, ethyl ester, thiab propyl ester, FAO / WHO, 1994).
Daim ntawv thov
Ethyl p-hydroxybenzoate, ua ib qho tshuaj preservative siv hauv kev ua zaub mov, tuaj yeem siv los khaws cov txiv hmab txiv ntoo tshiab thiab zaub tom qab kho qhov chaw.
Cov tshuaj lom ntawm p-hydroxybenzoic acid esters qis dua li ntawm benzoic acid. Nws cov nyhuv antibacterial tsis muaj dab tsi cuam tshuam nrog pH. Txawm li cas los xij, cov khoom no muaj cov dej solubility tsawg. Nrog rau qhov nce ntawm cov ester saw, cov roj solubility ntawm p-hydroxybenzoic acid esters nce, nws toxicity txo, thiab nws cov kev ua haujlwm tiv thaiv corrosion nce. Cov tshuaj tua kab mob thiab tshuaj tua kab mob ntawm p-hydroxybenzoic acid esters muaj zog dua li benzoic acid thiab sorbic acid thiab muaj cov txiaj ntsig zoo nyob rau hauv thaj tsam ntawm pH=4 ~ 8. Vim tias cov khoom noj ntxiv nrog p-hydroxybenzoate qee zaum ua rau cov ntxhiab tsw tsw qab. kub los yog acidity siab, nws yuav tsum tau hais tias qhov sib ntxiv ntawm cov zaub mov yuav tsum tsis txhob ntau tshaj 0.5g/kg. Thaum siv nyob rau hauv lub aqueous theem system, vim nws tsis tshua muaj solubility, nws yuav yaj nrog ib tug tsim nyog tus nqi ntawm ethanol los yog sodium carbonate tov. Txawm li cas los xij, tsis txhob siv cov alkali muaj zog, kom tsis txhob decompose nws thiab txo nws cov kev ua haujlwm ntawm cov kab mob.
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