Hav nyob ntawd! Raws li tus neeg muag khoom emulsifier, kuv feem ntau tau nug txog HLB qhov tseem ceeb ntawm cov emulsifiers sib txawv. Yog li, cia peb dhia dej mus rau hauv nws thiab saib seb cov emulsifiers sib txawv yeej muaj qhov sib txawv HLB.
First off, HLB yog dab tsi? HLB stands for Hydrophilic - Lipophilic Balance. Nws yog qhov ntsuas uas pab peb nkag siab tias tus emulsifier coj li cas hauv kev sib xyaw ntawm dej thiab roj. The HLB scale ranges from 0 to 20. A low HLB value (0 - 3) means the emulsifier is more lipophilic (oil - loving), hos a high HLB value (17 - 20) indicator it's more hydrophilic (dej - loving).
Tam sim no, thaum nws los txog rau cov emulsifiers sib txawv, cov lus teb yog qhov tseeb, lawv muaj qhov sib txawv HLB qhov tseem ceeb. Thiab qhov no yog qhov tseem ceeb heev vim tias HLB tus nqi ntawm emulsifier tuaj yeem txiav txim siab nws cov txiaj ntsig hauv kev siv sib txawv.
Cia peb saib qee cov emulsifiers thiab lawv cov nqi HLB. Ib qho zoo tshaj plaws - paub emulsifiers yog Span 20. Nws muaj HLB tus nqi nyob ib ncig ntawm 8.6. Span 20 yog lipophilic ntau dua, uas ua rau nws zoo rau kev tsim dej - hauv - roj (W/O) emulsions. Cov hom emulsions no feem ntau yog siv rau hauv cov khoom xws li cream thiab tshuaj pleev ib ce uas koj xav kom cov roj ua ntu ntu.
Ntawm qhov tod tes, peb muaj Tween 80. Tween 80 muaj HLB tus nqi ntawm 15. Nws yog hydrophilic ntau dua, yog li nws zoo meej rau kev ua roj - hauv - dej (O / W) emulsions. O / W emulsions feem ntau pom muaj nyob rau hauv cov khoom xws li cov khaub ncaws hnav khaub ncaws thiab mis nyuj, qhov twg cov dej yog qhov txuas mus ntxiv.
Yog vim li cas cov emulsifiers sib txawv muaj qhov sib txawv HLB qhov tseem ceeb boils mus rau lawv cov qauv tshuaj. Emulsifiers yog tsim los ntawm ob qho tib si hydrophilic thiab lipophilic qhov chaw. Qhov piv ntawm ob qhov no txiav txim siab tus nqi HLB. Piv txwv li, ib qho emulsifier nrog ib pawg hydrophilic loj thiab ib pawg lipophilic me me yuav muaj HLB tus nqi siab, thaum ib qho nrog cov pab pawg lipophilic loj thiab pawg me me hydrophilic yuav muaj HLB tus nqi qis.
Tab sis vim li cas nws tseem ceeb tias cov emulsifiers sib txawv muaj qhov sib txawv ntawm HLB? Zoo, yog tias koj tab tom tsim cov khoom lag luam, koj yuav tsum xaiv cov emulsifier txoj cai nrog tus nqi HLB tsim nyog rau koj cov kev xav tau tshwj xeeb. Wb hais tias koj tab tom ua tshuaj pleev thaiv hnub. Sunscreens feem ntau muaj ob qho tib si dej thiab roj. Koj xav tau lub emulsifier nrog tus nqi HLB uas tuaj yeem tsim qhov ruaj khov O / W emulsion kom cov tshuaj pleev thaiv hnub kis tau yooj yim ntawm daim tawv nqaij thiab tsis sib cais. Yog tias koj xaiv lub emulsifier nrog tus nqi HLB tsis raug, lub emulsion yuav tawg, thiab koj cov khoom yuav tsis ua haujlwm raws li qhov xav tau.
Lwm qhov yuav tsum tau xav txog yog tias qee zaum, koj yuav tsum tau siv cov khoom sib xyaw ntawm emulsifiers kom ua tiav qhov xav tau HLB tus nqi. Qhov no yog hu ua emulsifier system. Los ntawm kev sib txuas ob lossis ntau dua emulsifiers nrog HLB qhov sib txawv, koj tuaj yeem ua kom zoo - kho tag nrho HLB ntawm lub system. Piv txwv li, yog tias koj xav tau ib qho emulsifier nrog HLB tus nqi ntawm 10, thiab koj muaj ib qho emulsifier nrog HLB ntawm 8 thiab lwm qhov nrog HLB ntawm 12, koj tuaj yeem sib tov rau hauv qhov sib npaug kom tau qhov xav tau.
Tam sim no, kuv xav hais txog cov peev txheej nthuav dav uas tuaj yeem muab rau koj ntau dua hauv - cov ntaub ntawv tob txog emulsifiers thiab lawv qhov kev sim. Koj tuaj yeem tshawb xyuas4-testsdfgsdfg ua. Nws tau txais qee cov ntaub ntawv zoo thiab kev nkag siab uas tuaj yeem pab koj nkag siab emulsifiers zoo dua.
Raws li tus neeg muag khoom emulsifier, kuv tau pom ua ntej tias nws tseem ceeb npaum li cas los xaiv tus emulsifier txoj cai nrog tus nqi HLB raug. Peb muab ntau hom emulsifiers nrog cov nqi sib txawv ntawm HLB kom tau raws li kev xav tau ntawm peb cov neeg siv khoom. Txawm hais tias koj nyob hauv kev lag luam khoom noj, tshuaj pleev ib ce, lossis lwm qhov chaw uas yuav tsum tau emulsions, peb tau txais koj them.
Yog tias koj tam sim no nyob rau hauv tus txheej txheem ntawm kev tsim cov khoom tshiab los yog nrhiav kev txhim kho ib qho uas twb muaj lawm, tau txais txoj cai emulsifier yog qhov tseem ceeb heev. Thiab qhov ntawd yog qhov uas peb tuaj txog. Peb pab pawg kws tshaj lij tuaj yeem pab koj xaiv qhov zoo tshaj plaws emulsifier raws li koj cov kev xav tau tshwj xeeb. Peb nkag siab tias txhua yam khoom yog qhov tshwj xeeb, thiab peb tau cog lus tias yuav muab koj qhov zoo tshaj plaws - emulsifiers uas yuav ua kom koj cov formulations ua tiav.
Yog li, yog tias koj xav kawm ntxiv txog peb cov emulsifiers lossis muaj lus nug txog HLB qhov tseem ceeb thiab cov emulsifier twg yog qhov zoo rau koj, tsis txhob yig tiv tauj. Peb nyob ntawm no kom muaj kev sib tham, teb koj cov lus nug, thiab pab koj nrhiav cov tshuaj emulsifier zoo meej. Txawm hais tias koj yog tus tsim khoom me me - nplai lossis cov chaw tsim khoom loj -, peb tuaj yeem ua haujlwm nrog koj kom tau raws li koj cov kev xav tau emulsifier.
Hauv kev xaus, cov emulsifiers sib txawv muaj qhov sib txawv HLB qhov tseem ceeb, thiab cov txiaj ntsig no ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm emulsions hauv ntau yam khoom. Los ntawm kev nkag siab txog HLB lub tswv yim thiab xaiv txoj cai emulsifier, koj tuaj yeem tsim ruaj khov, siab - cov khoom zoo. Thiab raws li koj tus neeg muag khoom ntseeg siab emulsifier, peb npaj txhij los txhawb koj txhua kauj ruam ntawm txoj kev. Yog li, cia peb pib txoj kev taug kev no ua ke thiab ua kom koj cov khoom zoo tshaj plaws uas nws tuaj yeem ua tau!
Cov ntaub ntawv:
- McClements, DJ (2015). Khoom noj khoom haus Emulsions: Cov ntsiab lus, xyaum, thiab cov txuj ci. CRC Xovxwm.
- Becher, P. (1965). Emulsions: Kev xav thiab kev xyaum. Reinhold Publishing Corporation.