Lisebelisoa tsa li-sunscreens tse thibelang mahlaseli a UVA
E ka 'na eaba u utloile hore li-suncreens tse ling li ke ke tsa u sireletsa ka ho lekaneng liphellong tse senyang tsa letsatsi le hore u lokela ho utloisisa ho feta palo e letlapeng. Mantsoe ana a hlile a 'nete,' me ke habohlokoa hore u ithute ka lisebelisoa tseo u li hlokang secheso sa letsatsi. A re ke re bue ka hore na ke hobane'ng ha ho joalo, le seo u se hlokang ho se tseba pele u reka sekoahelo sa letsatsi.
Tšireletso ea Letsatsi le mahlaseli a UV
Li-sunscreens ke lihlahisoa tsa tlhokomelo tsa letlalo tse sebelisetsoang ho thibela ho tšoara foto le kankere ea letlalo. Ho fihlela morao tjena 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 le sireletsang letsatsi ho thibela mahlaseli a UVB.
Hona joale rea tseba hore mahlaseli a UVA a boetse a senya letlalo. Le hoja FDA e entse tlhahiso ea mokhoa oa ho lekanya o u tsebang hore hantle se sireletsang letsatsi le sireletsa UVA, tlhahiso eo ha e e-s'o amohelehe. Ka bomalimabe, tsela e le 'ngoe feela ea ho tseba ka bokhoni ba UVA-ho thibela sehlaseli sa letsatsi ke ho batla bonyane e' ngoe ea lisebelisoa tsena.
Li-sunscreens tse thibelang UVA Radiation
Ha u sheba sekoahelo sa letsatsi, ho hlokahala hore u bale letšoao mme u netefatse hore e 'ngoe ea lisebelisoa tse boletsoeng mona lethathamong. U se ke ua tšepa tlhahiso ea liphallelo tse bolelang hore sefate sa letsatsi se "molemo" kapa "se phethehile." Etsa khetho ea hau ea thuto e thehiloeng ho patlisiso ea hau.
U ka boela ua lakatsa ho sheba mekhoa e fapaneng bakeng sa lisebelisoa tse sireletsang khahlanong le mahlaseli a UVA ho etsa qeto ea hore na ke efe e loketseng litlhoko tsa hau.
Avobenzone
Avobenzone (Parsol 1789) ke eona feela lik'hemik'hale tse amohelang ponahalo eohle ea UVA ho tloha ho 310-400 nm. Ha e fane ka ts'ebeliso leha e le efe ea UVB.
Bothata ba avobenzone ke hore e senya letsatsi. Ha e le hantle, liphesente tse 50 ho isa ho tse 90 tsa sekoahelo sena sa letsatsi se lahleheloa ke hora e le 'ngoe ka mor'a hore li be le letsatsi. Li-absorb tse ling tsa UVB tse kang OMC le octocylene li etsa hore avobenzone e tsitsitse haholoanyane.
- Melemo: E thibela litebelisuoa tse feletseng tsa UVA 'me ha li bakise ho halefa ha letlalo
- Mathata: A senya ka potlako khanya ea letsatsi ntle le hore a kopane le ba bang ba UVB
Benzophenones
Benzophenone, oxybenzone le dioxybenzone ke mokotlana o tsoakiloeng oa thepa e metle le e mpe. Ke karolo e tloaelehileng eseng feela ka li-sunscreens empa hape le masela a sireletsang mahlaseli a UV. Ke li-absorbers tse ntle tsa UVA empa li boetse li kenngoa mofuteng oa UVB. Li-benzophenone ha li halefise joaloka PABA empa oxybenzone ke eona e halefisang ka ho fetisisa lihlahisoa tsohle tse sireletsang letsatsi ho 'marakeng hona joale.
- Melemo: E thibela mahlaseli a mahlaseli a kotsi a akarelletsang UVA
- Mathata: A halefisa mme ha a hane metsi
Helioplex
Helioplex ke moralo oa thepa ea Johnson & Johnson Neutrogena. Tlhahiso ena e ncha ke motsoako oa li-blockers tse ngata tse fapaneng tsa UVA le UVB hammoho le li-stabilizers tse bolokang lisebelisoa tse senyehileng tsa letsatsi ho senya. Ke setlolo sa letsatsi se setle, se sephara se sa halefiseng.
E fihla ho SPF ea 55, 70, le ea 85. Lintho tse sebetsang ho Helioplex tse nang le lihlooho tsa tsona ke:
- Avobenzone (karolo ea 3 lekholong)
- Oxybenzone (karolo ea 6 lekholong)
- Octocrylene (karolo ea 2,8 lekholong)
- Ho se kopanele (karolo ea 10 lekholong ho SPF 55 le liphesente tse 15 ho SPF 70)
- Tšoaea (karolo ea 5 lekholong)
Mexoryl SX (Ecamsole)
Mabitso a mang bakeng sa motsoako ona a kenyelletsa setšoantšo sa terephthalylidene sulfoic acid (TDSA), ecamsule le Anthelios SX. L'Oreal Paris e ntshetsa pele mexoryl 'me e' nile ea sebelisoa Europe ho tloha ka 1982. Ka 2006, FDA e lumeletse tšebeliso ea eona United States. E kopantsoe le avobenzone le octocylene mme e rekisoa US ka La Roche Posay e le Anthelios SX.
Sebaka sena sa lifensetere se sireletsa metsi, se tsitsitseng letsatsing, ebile ha se halefe letlalo. Mefuta e sebetsang ea Anthelios SX ka ho tsepamisa mohopolo ke:
- Ecamsule (karolo ea 2 lekholong)
- Avobenzone (karolo ea 2 lekholong)
- Octocrylene (karolo ea 10 lekholong)
Tlhokomelo
Tlhokomelo ea motsoako e na le motsoako oa menthyl anthranilate o fanang ka ho fana ka mahlaseli khahlanong le mahlaseli a UVA le hoja ho phatlalatsoa ha ho hoholo joaloka Mexoryl kapa benzophenones.
Titanium Dioxide le Zinc Oxide
Titanium dioxide le zinc oxide li nkoa e le li-sun blockers ho e-na le li-sunscreens. Li fana ka tšireletso khahlanong le mahlaseli a UVA empa li fokotsoa ke ponahalo ea bona ea opaque. Litšiea li sebetsa e le li-blockers, tse bontšang mahlaseli a kotsi a tlohang letlalo.
Sefate sa Letsatsi se Sireletsang (Tse Ling ho Feta Kankere ea Letlalo) - The Caveat
Re utloile ho hongata ka bohlokoa ba khanya ea letsatsi, empa seo re se fumanang ha re bua haholo ke e 'ngoe ea likarolo tse mpe tsa ho thibela mahlaseli a tukang ho fihlela letlalo la rona.
Ho na le lithuto tse ngata tse bontšang hore ho fumana vithamine D e lekaneng ho thibela bonyane mefuta e 27 e fapaneng ea kankere, ho akarelletsa le melanoma , le ho sireletsa letsatsi ho thibela ho chesa ha letsatsi feela empa ho noa vithamine D ka letlalo.
Sena ha se bolele ho tlōla sefate sa letsatsi. Bua le ngaka ea hau. Lingaka tse ling li khothalletsa ho lieha ho sebelisoa ha sehlahisoa sa letsatsi ho fihlela ha u le letsatsing metsotso e 10 ho ea ho e 15-nako eo e ntseng e nka ho fumana tekanyo e nepahetseng ea vithamine D. Mekhatlo e mengata ea menyako ea lipalesa e boetse e nahana ka likhothatso tsa motlakase oa letsatsi ka lebaka lena.
Ho thata haholo ho fumana vithamine D eohle eo ue hlokang ka mokhoa oa ho ja u le mong, le hoja li-supplement tsa vithamine D3 ke tsela e 'ngoe ea ho fumana vithamine D eo ue hlokang. Ntho e molemo ka ho fetisisa ke hore o ka fumana habonolo ha o hloka vithamine D e eketsehileng ka teko e bonolo ea mali. Hopola hore mefuta e tloaelehileng e pharaletse haholo. Ka mohlala, lab ea hao e ka 'na ea bolela hore tekanyo ea 30 ho ea ho ea 80 e tloaelehile, leha ho le joalo liphuputso tse ling li bontša hore maemo a 50 ho isa ho a 80 a loketse ho fokotsa kotsi ea kankere. Kahoo kamehla botsa nomoro ea hau hape. Ho ba le vithamine D e lekaneng ho ka u thusa ho fokotsa kotsi ea kankere, empa ho feteletseng ho ka baka majoe a bohloko a liphio. (E, karolo ea botle ba ho fumana vithamine D ea hau letsatsing ke hore u sitoa ho fumana haholo.)
Lisebelisoa:
Freitas, J., le L. Gaspar. In Vitro Photosafety le Efficacy Screening ea Apigen, Chrysin le Beta-Carotene bakeng sa UVA le VIS Protection. Europe Journal of Pharmaceutical Science . 2016. 89: 146-53.
Stiefel, C., le W. Schwack. Tlhaloso ea lifoto ka linako tsa ho fetoha - Mohla oa mahlaseli oa UV le Tšireletseho, Ts'ebetso ea Sensitization le Likarolo tsa Ts'ebetso. International Journal of Cosmetic Science . 2015. 37 (1): 2-30.