Qhov txawv ntawm BHA thiab BHT yog dab tsi

2024 Tus sau: Alex Aldridge | [email protected]. Kawg hloov kho: 2023-12-17 13:40

Qhov sib txawv tseem ceeb ntawm BHA thiab BHT yog BHA yog cov roj-soluble waxy khoom muaj E tooj E320, whereas BHT yog cov roj-soluble dawb hmoov uas muaj E tooj E321.

BHA thiab BHT yog cov tshuaj antioxidants tseem ceeb thiab cov khoom noj ntxiv. Cov ntsiab lus no sawv cev rau butylated hydroxyanisole thiab butylated hydroxytoluene, feem.

BHA (Butylated Hydroxyanisole) yog dab tsi?

BHA yog butylated hydroxyanisole. Nws yog ib qho antioxidant uas muaj kev sib xyaw ntawm ob lub isomeric organic tebchaw hu ua 2-tert-butyl-4-hydroxyanisole thiab 3-tert-butyl-4-hydroxyanisole. Peb tuaj yeem npaj nws los ntawm 4-methoxyphenol thiab isobutylene. Cov khoom siv no zoo li cov khoom siv quav ciab zoo li cov khoom noj ntxiv. Nws muaj tus lej E E320. Cov kev siv tseem ceeb ntawm cov tshuaj no suav nrog kev siv tshuaj tua kab mob antioxidant thiab khaws cia hauv cov khoom noj, ntim khoom noj, tsiaj pub, tshuaj pleev ib ce, roj hmab, thiab roj av. Nws kuj tseem muaj txiaj ntsig zoo hauv cov tshuaj, xws li cholecalciferol (vitamin D3), isotretinoin, iovastatin, thiab simvastatin.

Cov tshuaj formula ntawm cov tshuaj no yog C₁₁H₁₆O₂ Nws molar mass yog 180.24 g/mol. Nws zoo nkaus li cov khoom siv quav ciab nrog qhov ntom ntawm 1.05 g / cm^{3 Nws cov ntsiab lus melting yog 48 - 55 degrees Celsius thaum lub boiling point yog 264 - 270 degrees Celsius. Nws yog insoluble hauv dej thiab dawb soluble hauv ethanol, methanol, propylene glycol, rog, thiab roj.}

Thaum xav txog nws cov khoom antioxidant, nws tau ntxiv rau cov khoom noj muaj roj thiab cov zaub mov muaj roj vim nws cov khoom antioxidant thiab vim tias nws tuaj yeem tiv thaiv cov zaub mov rancidification. Rancidification tuaj yeem ua rau muaj ntxhiab tsw. Nws tuaj yeem siv nws lub nplhaib sib xyaw ua ke kom ruaj khov dawb radicals, sequestering lawv. Yog li ntawd, lawv tuaj yeem ua raws li cov dawb radical scavengers. Qhov no tuaj yeem tiv thaiv tsis muaj kev tawm tsam dawb radical ntxiv.

BHT (Butylated Hydroxytoluene) yog dab tsi?

BHT yog butylated hydroxytoluene. Nws yog lipophilic organic compound uas muaj cov tshuaj formula C₁₅H₂₄O. Cov molar mass ntawm no compound yog 220.35 g / mol. Nws zoo nkaus li cov hmoov dawb mus rau daj thiab muaj cov ntxhiab tsw phenolic me ntsis. Qhov ceev ntawm qhov sib xyaw no yog 1.048 g / cm^{3 Nws qhov taw qhia ntawm BHT yog 70 degrees Celsius, thiab nws qhov kub kub yog 265 degrees Celsius. Nws muaj tsis zoo solubility nyob rau hauv dej thiab yog flammable. Nws tuaj yeem piav qhia tias yog derivative ntawm phenol. Nws muaj txiaj ntsig zoo vim nws cov khoom antioxidant. Yog li, cov khoom siv no tau siv dav los tiv thaiv dawb radical-mediated oxidation hauv cov kua.}

Cov tshuaj synthesis ntawm BHT tuaj yeem ua tiav siv cov tshuaj tiv thaiv p-cresol nrog isobutylene. Lub catalyst rau cov tshuaj tiv thaiv no yog sulfuric acid. Raws li lwm txoj kev, BHT tuaj yeem npaj los ntawm 2, 6-di-tert-butylphenol ntawm hydroxymethylation.

Thaum xav txog cov ntawv thov ntawm BHT, nws yog siv los ua zaub mov ntxiv thiab ua antioxidant. Tebchaws Asmeskas tau muab faib ua qhov chaw nyab xeeb raws li kev tshawb fawb, thiab nws tau pom zoo los ntawm FD thiab. Raws li cov tshuaj tiv thaiv antioxidant, nws yog siv rau hauv cov dej ua haujlwm hlau, tshuaj pleev ib ce, tshuaj, roj hmab, roj transformer, thiab embalming kua. Hauv kev lag luam roj av, qhov sib xyaw no suav tias yog cov khoom siv roj ntxiv (AO-29) rau cov roj iav, roj turbine, cov kua dej hydraulic, thiab cov dav hlau dav hlau.

Dab tsi yog qhov zoo sib xws ntawm BHA thiab BHT?

1. BHA thiab BHT yog siv los ua zaub mov ntxiv.
2. Ob leeg muaj cov tshuaj antioxidant.
3. Lawv muaj tus lej E.
4. Ob leeg yog cov khoom siv butylated.
5. Lawv tuaj yeem ruaj khov dawb radicals, sequestering lawv siv lub nplhaib uas muaj ntxhiab.

Qhov txawv ntawm BHA thiab BHT yog dab tsi?

BHA thiab BHT yog cov khoom tseem ceeb antioxidant uas tuaj yeem siv los ua zaub mov ntxiv. Qhov sib txawv tseem ceeb ntawm BHA thiab BHT yog BHA yog cov roj-soluble waxy khoom muaj tus lej E E320, qhov BHT yog cov roj-soluble dawb hmoov uas muaj E tooj E321.

Cov hauv qab no qhia txog qhov sib txawv ntawm BHA thiab BHT hauv daim ntawv teev npe rau kev sib piv ntawm ib sab.

Summary – BHA vs BHT

BHA yog butylated hydroxyanisole, thaum BHT sawv cev rau butylated hydroxytoluene. Qhov sib txawv tseem ceeb ntawm BHA thiab BHT yog BHA yog cov roj-soluble waxy khoom muaj tus lej E E320, qhov BHT yog cov roj-soluble dawb hmoov uas muaj E tooj E321.