Lijo tse thibelang mahlaseli a UVB
Li-sunscreens ke lihlahisoa tsa bohlokoa tse khabisitsoeng ho sebelisoa ho thibela ho chesa letsatsi, photoaging le kankere ea letlalo. Ho fihlela haufinyane, ho ne ho lumeloa hore ho thibela mahlaseli a UVB le ho chesoa ke letsatsi ke tsona feela mehato e hlokahalang ho thibela letsatsi ho senya. Tekanyetso ea SPF e ile ea ntlafatsoa ho lekanya bokhoni ba letsatsi ba ho sireletsa letsatsi ho thibela mahlaseli a UVB. Hona joale rea tseba hore mahlaseli a UVA a boetse a tlatsetsa ho senya letlalo.
Kaha SPF ke tekanyo ea tšireletso ea UVB, metsoako e fapana pakeng tsa khanya ea letsatsi e amohelang mahlaseli a UVB 'me e fana ka tšireletso e pharaletseng - kapa UVA le UVB. Lintho tsena tse tloaelehileng tsa lik'hemik'hale li sebelisoa li-sunscreens ho fumana mahlaseli a UVB feela .
PABA
PABA , kapa para-aminobenzoic acid , e ile ea fihla 'marakeng United States mathoasong a lilemo tsa bo-1970' me e ne e le letlalo la pele la letsatsi le sireletsang letsatsi le neng le fumaneha haholo. Leha ho le joalo, ke mofuta o tloaelehileng oa allergen 'me ho tloha nakong e fetileng o se o tlohile mefuteng e mengata. Ha e atisa ho sebelisoa matsatsing a kajeno a letsatsi.
- Melemo: PABA e khomarela ka lisele ho lisele tsa epidermis, e thibela ho hlatsuoa metsing kapa ho hloekisoa ka thaole.
- Litlhahiso: E baka liphello tsa mafu a mang a etsang karolo ea 4 lekholong ea baahi 'me e boetse e baka liphahlo.
PABA Esters
PABA e le ' ngoe feela e amohelehang ke FDA bakeng sa ho sebelisoa United States ke Mophatlalatsi O , eo hape a tsejoang e le Octyl dimethyl PABA .
Sebaka sena ke lik'hemik'hale tse tšoanang le PABA, empa ha se halefe. Hang ha PABA e sa sebetsane le li-sunscreens e ile ea ntlafatsoa, ho tsebahala ha Padimate O ho ile ha fokotseha ka potlako. Bothata ba mahlaba-pelo O o ntse a le teng li-sunscreens hobane li sebelisoa le lik'hemik'hale tse ling ho eketsa SPF ea sehlahisoa.
- Melemo: E thibela metsi ebile ha e na litšila.
- Mathata: Ho tsejoa hore e baka liphello tsa khatello ea mali.
Lithakoana
Li- cinnamate , Octyl methoxycinnamate le cinoxate , ke li-absorbers tsa UVB tse atisang ho sebelisoa ka ho fetisisa United States. Hangata li fumanoa litlolo tse nang le SPF factor.
- Melemo: Ke li-absorber tse matla tsa UVB. Ha li kopantsoe le lik'hemik'hale tse ngata tse "tiileng," li thusa ho etsa hore lik'hemik'hale tseo li be le metsi a mangata le a tsitsitseng.
- Mathata: Ba ka halefisa. Batho ba nang le tšusumetso ho balsame ea Peru, balsam ea tolu, makhasi a coca, oli ea cinnamic aldehyde le oli ea cinnamic le tsona li ka ba lichelete tsa li-cinnamate.
Salicylates
Salicylates ke homomenthyl salicylate , octyl salicylate , le salicylate ea triethanolamine . Salicylates li 'nile tsa sebelisoa nako e telele, esita le pele ho PABA. Trolamine salicylate ke metsi a qhibilihisang metsi, kahoo e atisa ho sebelisoa ka lihlahisoa tsa moriri tse sireletsang khahlanong le mahlaseli a kotsi a UV. Ho kopanela liphate ke lik'hemik'hale tseo FDA e li sebelisang e le tekanyetso ea ho lekanya SPF.
- Melemo: Li thibela metsi ebile li tsitsitse ho ba teng ha letsatsi.
- Mathata: Ba sireletsa khahlanong le karoloana e nyenyane ea sebone sa UVB, kahoo ba lokela ho se sebelisoa ka maemo a phahameng.
Octocrylene
Hangata li-octocrylene li sebelisetsoa ho tsitsisa avobenzone, motsoako oa UVA, 'me haholo-holo o teng lihlahisoa tse seng tsa comedogenic.
Ke e 'ngoe ea li-absorber tse seng kae tsa UV tse ka sebelisoang ka li-sunscreens tsa gel.
- Melemo: Hangata e halefisa letlalo.
- Mathata: E tlameha ho kopanngoa le lisebelisoa tse ling tsa UV ho e etsa hore e be tsitsitseng haholoanyane ebile e theko e boima ho hlahisa.
Ensulizole
Ensulizole kapa PBSA ke metsi a qhibilihisang metsi, kahoo a sebelisoa ho li-moisturizers tse ngata. E etsa mosebetsi o motle oa ho thibela mahlaseli a UVB, empa ha e thibele mahlaseli afe kapa afe a UVA. Li-filters tsa UVB tse thathamisitsoeng ka holimo li thibela mahlaseli a makae a UVA.
- Melemo: Hangata e baka ho halefa ha letlalo.
- Mathata : E thibela mahlaseli a kotsi a mahlaseli a kotsi.
Lisebelisoa:
Lautenschlager, S, HC Wulf, le MR Pittelkow. "Ho sireletsa lifoto," Lancet. 370 (2007): 528-37.
Nguyen, Nathalie le Darrell Rigel. "Ho sireletsa lifoto le thibelo ea Photocarcinogenesis." Ho thehoa ha Litlolo tsa Litho tsa Letlalo. Ed. Zoe Draelos & Lauren Thamon. New York: Taylor le Francis, 2006. 156-9.
Palm, MD, le MN O'Donoghue. "Ntlafatsa ts'ebetsong ea ho thibela photo photo." Dermatol Ther. 20 (2007): 360-76.