izindaba

Ukuvikelwa kwelanga kuyinto ebalulekile kwabesifazane banamuhla unyaka wonke. Ukuvikelwa kwelanga akugcini nje ngokunciphisa umonakalo wemisebe ye-ultraviolet esikhumbeni, kodwa futhi kugweme ukuguga kwesikhumba nezifo zesikhumba ezihlobene. Izithako ze-sunscreen zivame ukwakhiwa ngokomzimba, ngamakhemikhali, noma ingxube yazo zombili izinhlobo futhi zinikeze ukuvikelwa kwe-UV okubanzi. Ukuze sikusize ukuthi uthenge kangcono i-sunscreen yabo esikhathini esizayo, namuhla sikuthatha ezithakweni ezisebenzayo zamakhemikhali kanye nezithako ezisebenzayo zomzimba ukuze uhlaziye izithako ezisebenzayo ze-sunscreen.

Ingxenye esebenzayo yamakhemikhali

I-Octyl methoxycinnamate

I-Octyl methoxycinnamate (OMC)ingenye yezithako zokuvikela ilanga ezisetshenziswa kakhulu. I-Octyl methoxycinnamate (OMC) iyisihlungi se-UVB esinomugqa omuhle kakhulu wokumunca i-UV ongu-280 ~ 310 nm, izinga eliphezulu lokumunca, ukuphepha okuhle, ubuthi obuncane, kanye nokuncibilika okuhle ezintweni zokusetshenziswa ezinamafutha. Eyaziwa nangokuthi i-octanoate kanye ne-2-ethylhexyl 4-methoxycinnamate. Le nhlanganisela ivunyelwe njengesithako sezimonyo e-United States kanye ne-European Union (EU) ngamanani angu-7.5-10%.

I-Benzophenone-3

I-Benzophenone-3(BP-3) iyisithako selanga esincibilika ku-oyili esimunca imisebe ye-UVB kanye ne-UVA emifushane. I-BP-3 ishiswa ngokushesha ngaphansi kwemisebe ye-ultraviolet, inciphisa ukusebenza kwayo futhi ikhiqize inani elikhulu lezinhlobo ze-oxygen ezisabelayo. E-United States, ukuhlushwa okuphezulu okuvunyelwe kwe-BP-3 kusithako selanga kungu-6%.

I-Benzophenone -4

I-Benzophenone-4(BP-4) ivame ukusetshenziswa njengesithambisi se-ultraviolet ngamanani afinyelela ku-10%. I-BP-4, njenge-BP-3, iyi-derivative ye-benzophenone.

I-4-methylbenzyl camphor

I-4-methylbenzylidene camphor (4-methylbenzylidene camphor, 4-MBC) noma i-enzacamene iyi-organic camphor derivative esetshenziswa njengesithako se-UVB kuma-sunscreen nakwezinye izimonyo. Nakuba le nhlanganisela ingavunyelwe yi-US Food and Drug Administration (FDA), amanye amazwe avumela ukusetshenziswa kwale nhlanganisela ngamanani afinyelela ku-4%.

I-4-MBC iyisakhi esinobuthi obuphezulu kakhulu esingamuncwa ngesikhumba futhi sikhona ezicutshini zomuntu, kufaka phakathi i-placenta. I-4-MBC inomphumela wokuphazamiseka kwe-estrogen endocrine, okuthinta i-axis ye-thyroid futhi ivimbele umsebenzi we-AChE. Ngakho-ke, isivikelo selanga esiqukethe lezi zithako kufanele sisetshenziswe ngokuqapha.

I-camphor ye-3-benzal

I-3-benzylidene camphor (3-BC) iyinhlanganisela ephiliza ama-lipophilic ehlobene kakhulu ne-4-MBC. Isilinganiso esiphezulu sayo esisetshenziswa emikhiqizweni yokuvikela ilanga e-European Union singama-2%.

Njenge-4-MBC, i-3-BC nayo ichazwa njenge-ejenti ephazamisa i-estrogen. Ngaphezu kwalokho, i-3-BC ibikwe ukuthi ithinta i-CNS. Futhi, i-sunscreen equkethe lezi zithako kufanele isetshenziswe ngokuqapha.

I-Octylene

I-Octocrtriene (OC) iyi-ester eyingxenye yeqembu le-cinnamate elimunca imisebe ye-UVB kanye ne-UVA, enamazinga afinyelela ku-10% kuma-sunscreen kanye nezimonyo zansuku zonke.

Ingxenye esebenzayo ngokomzimba

Izithako ezisebenzayo zomzimba ezisetshenziswa kuma-sunscreen ngokuvamile yi-titanium dioxide (TiO2) kanye ne-zinc oxide (ZnO2), futhi amazinga azo ngokuvamile angama-5-10%, ikakhulukazi ngokubonakalisa noma ukusabalalisa imisebe ye-ultraviolet (UVR) ukuze kufezwe injongo ye-sunscreen.

I-titanium dioxide

I-Titanium dioxide iyiminerali emhlophe ewumpuphu eyakhiwe yi-titanium nomoya-mpilo. I-Titanium dioxide isetshenziswa kabanzi ekudleni nasezimonyweni, ikakhulukazi ngenxa yobumhlophe bayo kanye nokusebenza kahle kwe-UV sunscreens.

I-zinc oxide

I-Zinc oxide iyimpuphu emhlophe enezakhiwo zokuvikela nezokuhlanza. Futhi iyisivikelo selanga se-UV esibonisa imisebe ye-UVA ne-UVB. Ngaphezu kwalokho, i-zinc inezakhiwo zokulwa nokuvuvukala, ezibangela ukucasuka kanye nezokomisa. I-Zinc oxide, isivikelo selanga esiqashelwa njengephephile futhi esisebenzayo yi-US Food and Drug Administration, ingenye yazo.

Ngemva kwencazelo yalesi sihloko, ingabe usunokuqonda okungcono ngezithako ezisebenzayo ze-sunscreen? Ngicela ungithinte uma uneminye imibuzo.