Muaj ntau tus tau hnov ntau dua ib zaug txog lub tswv yim xws li pH (nruab nrab, acidic lossis alkaline). Qhov no yog qhov taw qhia ntawm hydrogen, thiab nws tuaj yeem pom ob qho tib si ntawm lub raj ntawm cov tshuaj nplaum thiab ntawm tus kws kho mob dermatologist. Cov ntaub ntawv hais txog pH ntawm daim tawv nqaij yog qhov tseem ceeb heev. Qhov ntsuas no yog dab tsi? Wb sim saib seb.
me ntsis txog tus qauv ntawm daim tawv nqaij
Raws li koj paub, stratum corneum, nyob rau hauv daim tawv nqaij epidermis, ua haujlwm ntawm kev tiv thaiv. Nws muaj cov dej-lipid matrix uas muaj cov rog rog thiab cov kua qaub ntawm Marchionini. Ntau tus neeg ntseeg tias nws cov pH yog nruab nrab - txog 7, tab sis qhov no yog kev xav tsis zoo. Npog nrog xws li pH yuav qhuav thiab nruj. Cov tawv nqaij muaj lactic thiab citric organic acids nyob rau hauv nws muaj pes tsawg leeg, uas txhais tau hais tias nws tshuav nyiaj li cas yuav tsum tsis txhob mus dhau lub qaub. Yog tias muaj kev cuam tshuam lossis kev hloov pauv tshwm sim hauv dermis, tom qab ntawd pH ntawm epidermis pib hloov pauv ntau heev. Qhov no tej zaum yuav tshwm sim los ntawm ib qho mob hnyav, lossis tshwm sim ntawm kev tu tawv nqaij tsis raug.
PH Scale
ThawjUa ntej tshaj plaws, koj yuav tsum nco ntsoov tias lub tswv yim ntawm "pH nruab nrab" siv tshwj xeeb rau ib puag ncig hauv nqe lus nug. Hais txog ntawm daim tawv nqaij, nws tus nqi yog 5, 2-5, 7, kua muag - 7, 4, thiab nyob rau hauv cov tshuaj tov, qhov nruab nrab pH yog 7 units (piv txwv li, dej).
Los ntawm chemistry zaj lus qhia peb paub tias cov kua qaub-puag ntsuas thaj tsam li ntawm 0 txog 14. Cov pH nruab nrab yog ib nrab, txhua yam qis dua yog acidic, txhua yam siab dua yog alkaline. Raws li cov ntsiab lus hauv cosmetology, "pH nruab nrab" txhais tau hais tias qhov ntsuas acid-puag yog qhov zoo tshaj plaws rau txhua daim tawv nqaij.
Ntxiv rau, cov tawv nqaij oily kuj txiav txim siab los ntawm qhov ntsuas no. Cov tawv nqaij qhuav muaj pH ntawm 5.7 txog 7, cov tawv nqaij ib txwm muaj pH ntawm 5.2 txog 5.7, thiab cov tawv nqaij oily muaj pH ntawm 4 txog 5.2.
Teeb meem ntawm daim tawv nqaij: lub voj voog vicious
Peb twb paub lawm tias pH yog dab tsi, thiab tam sim no cia peb tham txog cov teeb meem cuam tshuam nrog qhov ntsuas no. Cov tawv nqaij oily yog ib qho teeb meem rau ntau tus neeg. Tshwj xeeb tshaj yog thaum hluas. Yuav luag txhua tus me nyuam inevitably tsim pob txuv thiab pob txuv. Tau kawg, qhov no yog qhov tshwm sim ntawm qhov tsis ua haujlwm ib ntus hauv keeb kwm hormonal. Txawm li cas los xij, nws yog lub sijhawm no uas kev saib xyuas ntawm lub ntsej muag yog qhov tseem ceeb heev.
Cov niam txiv qhia li cas rau qhov no? Ntxuav ntau zaus? Tus tub hluas ua li ntawd, tab sis pob txuv tsuas yog mob zuj zus xwb. Yog vim li cas? Cov xab npum yog alkaline thiab nws cov pH ntawm 6 txog 11. Nws nquag siv ua rau lub fact tias nws ntxuav tawm sab saum toj txheej ntawm lub ntsej muag nrog ib tug acidic ib puag ncig. Kev tiv thaiv kev ua haujlwm ntawm stratum corneum ua haujlwm hauv txoj hauv kev uas cov kab mob tsis tshua muaj txiaj ntsig acidic tam sim no nyob rau hauv cov nroj tsuag ntawm lub ntsej muag ntawm daim tawv nqaij, ntau nws tsim cov roj subcutaneous. Ntawm no yog lub voj voog vicious: qhov ntau peb ntxuav, ntau oily daim tawv nqaij ua. Ib lo lus nug ntuj tshwm sim: "Yuav ua li cas?"
Yuav ua li cas kom pH zoo li qub?
txhawm rau khaws nws cov kua qaub-puag sib npaug thaum ntxuav lub ntsej muag, nws yuav tsum tau saib xyuas tshwj xeeb rau cov tshuaj pleev ib ce uas siv hauv cov txheej txheem no. Thawj kauj ruam yog txhawm rau txheeb xyuas seb cov pH nruab nrab ntawm cov xab npum twg tuaj yeem siv rau kev ntxuav tas li. Yog tias qhov no yog qhov kev ntsuas tiag tiag, ces lub hauv paus hydrogen yuav tsum yog acidic (txog 5.5 units). Cov no suav nrog cov foams tshwj xeeb, gels, txhuam rau ntxuav cov tawv nqaij oily (pH=4).
Yog tias tsis muaj teeb meem li ntawd, kev saib xyuas koj tuaj yeem siv cov khoom siv nrog cov tshuaj tiv thaiv acidic me ntsis, 5.5 units, rau cov tawv nqaij qhuav - ze rau nruab nrab - 6.5. Txawm li cas los xij, koj yuav tsum nco ntsoov tias nyob rau hauv kev txiav txim. Txhawm rau xaiv cov khoom tu tawv nqaij kom raug, nws yog ib qho tsim nyog yuav tsum kwv yees sib npaug ntawm cov kua qaub-puag. Ib yam mus rau lwm yam khoom siv tawv nqaij. Ib lub gel nrog pH nruab nrab feem ntau yog tsim rau cov tawv nqaij qhuav, tab sis rau cov teeb meem, koj yuav tsum xaiv cov khoom nrog ib puag ncig acidic me ntsis.
Zoo li txhua yam tshuaj, tshuaj zawv plaub hau kuj muaj nws tus kheej pH, thiab txhua hom tshuaj sib txawv. Ntawm no, raws li txoj cai ntawm chemistry, tib txoj cai siv raws nraim: qhov ntsuas qis txog li 7 units yog acidic, siab dua yog alkaline. Cov tshuaj zawv plaub hau nrog nruab nrab pH theem - raws nraim 7 units. Hais txog ntawm tawv taub hau, yuav luag txhua yam tseem tsis hloov. Nquag, nws muaj ib puag ncig acidic me ntsis - 4, 5-5, 5. Qhov no txhais tau hais tias kev xaiv tshuaj zawv plaub hau yuav tsum nyob ntawm seb cov tawv taub hau oily npaum li cas.
Rau hom qhuav, nws raug nquahu kom siv tshuaj zawv plaub hau ntau dua, thiab rau cov oily, me ntsis acidic. Yog tias tawv taub hau yog xaiv, xws li menyuam yaus, ces koj yuav tsum xaiv cov tshuaj zawv plaub hau nrog pH nruab nrab (7 units). Hmoov tsis zoo, tsuas yog qee tus neeg tsim khoom lag luam qhia tias qhov ntsuas acid-puag muaj nyob rau hauv lawv cov khoom kom zoo nkauj. Lawv tsuas yog txwv rau cov ntawv sau (rau qhuav, oily, rau daim tawv nqaij ib txwm). Qhov no tsis yog lawm, raws li kev tshawb fawb qhia tau hais tias cov tshuaj zawv plaub hau rau cov tawv nqaij ib txwm zoo li alkaline thiab yuav tsum yog acidic me ntsis.
Puas pH ntawm daim tawv nqaij thiab cov khoom puas tuaj yeem txiav txim tau?
Ntau tus xav paub txog cov dej-acid sib npaug hauv cov khoom tshwj xeeb. Hauv tsev, ua qhov kev xeem tsis yog qhov nyuaj. Qhov no yuav tsum muaj kev daws teeb meem thiab qhov ntsuas acid-puag, feem ntau yog litmus strips. Lawv tau dipped rau hauv cov tshuaj thiab muab tso rau ntawm daim ntawv dawb. Xim tshwm yuav luag tam sim ntawd ntawm qhov taw qhia. Raws li cov txheej txheem xim, koj tuaj yeem txiav txim siab seb qhov chaw yog acidic lossis alkaline. Piv txwv li, yog tias litmus dipped nyob rau hauv alkali, nws yuav muab ib tug xiav xim, nyob rau hauv ib tug acidic ib puag ncig - liab.
Lwm txoj hauv kev kom paub seb pH yog dab tsipH ntsuas. Qhov no yog ib qho khoom siv nrov heev nrog cov neeg siab. Nws yog siv nyob rau hauv kev lag luam uas yuav tsum tau tswj ib puag ncig (roj tsim, tshuaj thiab xim industries, thiab lwm yam). Cov cuab yeej zoo li no tuaj yeem nrhiav tau ntawm tus kws kho mob dermatologist. Hauv tsab xov xwm no, peb tau kawm seb pH yog dab tsi thiab pom seb yuav xaiv cov khoom tu tawv nqaij zoo li cas raws li lawv cov kua qaub-puag tshuav.
