iindaba

Ukukhuselwa lilanga yinto ebalulekileyo kubafazi banamhlanje unyaka wonke. Ukukhuselwa lilanga akunakunciphisa kuphela umonakalo wemitha ye-ultraviolet eluswini, kodwa kukwathintela nokwaluphala kwesikhumba kunye nezifo zesikhumba ezinxulumene noko. Izithako ze-sunscreen zihlala zenziwe ngezinto ezibonakalayo, iikhemikhali, okanye umxube weentlobo zombini kwaye zibonelela ngokhuseleko lwe-UV olubanzi. Ukuze sikuncede uthenge ngcono i-sunscreen yabo kwixesha elizayo, namhlanje sikuthatha kwizithako ezisebenzayo zeekhemikhali kunye nezithako ezisebenzayo zomzimba ukuze uhlalutye izithako ezisebenzayo ze-sunscreen.

Icandelo elisebenzayo lekhemikhali

I-Octyl methoxycinnamate

I-Octyl methoxycinnamate (i-OMC)yenye yezona zinto zisetyenziswa kakhulu kwi-sunscreen agents. I-Octyl methoxycinnamate (OMC) sisihluzo se-UVB esine-UV absorption curve egqwesileyo ye-280 ~ 310 nm, izinga eliphezulu lokufunxa, ukhuseleko oluhle, ubuthi obuncinci, kunye nokunyibilika okuhle kwizinto eziluhlaza ezinamafutha. Ikwaziwa nangokuthi yi-octanoate kunye ne-2-ethylhexyl 4-methoxycinnamate. Le compound ivunyiwe njengesithako se-cosmetic e-United States nakwi-European Union (EU) ngamanani e-7.5-10%.

I-Benzophenone-3

I-Benzophenone-3(BP-3) sisithambisi selanga esinyibilikayo kwioyile esifunxa zombini imitha ye-UVB kunye ne-UVA emfutshane. I-BP-3 inyibilikiswa ngokukhawuleza phantsi kwemitha ye-ultraviolet, inciphisa ukusebenza kwayo kwaye ivelise inani elikhulu leentlobo zeoksijini ezisebenzayo. E-United States, ubuninzi obuvumelekileyo be-BP-3 kwisithambisi selanga yi-6%.

I-Benzophenone -4

I-Benzophenone-4(BP-4) isetyenziswa kakhulu njenge-ultraviolet absorber xa ifikelela kwi-10%. I-BP-4, njenge-BP-3, sisiphumo se-benzophenone.

I-4-methylbenzyl camphor

I-4-methylbenzylidene camphor (4-methylbenzylidene camphor, 4-MBC) okanye i-enzacamene sisixhobo se-organic camphor esisetyenziswa njengesifunxi se-UVB kwi-sunscreens nakwezinye izinto zokuthambisa. Nangona esi sisixhobo singavunywanga yi-US Food and Drug Administration (FDA), amanye amazwe avumela ukusetyenziswa kwesi sisixhobo kwizinga elifikelela kwi-4%.

I-4-MBC yinxalenye ethanda kakhulu ukunyibilika kwamafutha emzimbeni enokufunxwa lusu kwaye ikhona kwizicubu zomntu, kuquka ne-placenta. I-4-MBC inefuthe lokuphazamiseka kwe-estrogen endocrine, ichaphazela i-thyroid axis kwaye ithintele umsebenzi we-AChE. I-sunscreen equlethe ezi zithako kufuneka isetyenziswe ngononophelo.

I-3-benzal camphor

I-3-benzylidene camphor (3-BC) yikhompawundi ebangela i-lipophilic enxulumene kakhulu ne-4-MBC. Ubuninzi bayo obusetyenziswa kwiimveliso ze-sunscreen kwi-European Union yi-2%.

Njenge-4-MBC, i-3-BC ikwachazwa njenge-arhente ephazamisa i-estrogen. Ukongeza, i-3-BC ibikwe ukuba ichaphazela i-CNS. Kwakhona, i-sunscreen equlethe ezi zithako kufuneka isetyenziswe ngononophelo.

I-Octylene

I-Octocrtriene (OC) yi-ester ekwiqela le-cinnamate elifunxa imisebe ye-UVB kunye ne-UVA, enomlinganiselo ofikelela kwi-10% kwii-sunscreens nakwizinto zokuthambisa zemihla ngemihla.

Icandelo elisebenzayo ngokwasemzimbeni

Izithako ezisebenzayo zomzimba ezisetyenziswa kwi-sunscreens zihlala ziyi-titanium dioxide (TiO2) kunye ne-zinc oxide (ZnO2), kwaye ubuninzi bazo buhlala buyi-5-10%, ikakhulu ngokubonakalisa okanye ukusasaza i-incident ultraviolet radiation (UVR) ukufezekisa injongo ye-sunscreen.

I-titanium dioxide

I-titanium dioxide yiminerali emhlophe engumgubo eyenziwe yi-titanium kunye ne-oxygen. I-titanium dioxide isetyenziswa kakhulu ekutyeni nakwizinto zokuthambisa, ingakumbi ngenxa yokuba mhlophe kwayo kunye nokusebenza kakuhle kwe-UV sunscreens.

I-zinc oxide

I-Zinc oxide ngumgubo omhlophe oneempawu zokukhusela nezokucoca. Ikwali-sunscreen ekhuselayo ye-UV ebonakalisa zombini imitha ye-UVA kunye ne-UVB. Ukongeza, i-zinc ineempawu zokulwa nokuvuvukala, ukurhawuzelela kunye nokomisa. I-Zinc oxide, i-sunscreen eqatshelwa njengekhuselekileyo nesebenzayo yi-US Food and Drug Administration, yenye yazo.

Emva kwenkcazo yale nqaku, ngaba uyiqonda ngcono izithako ezisebenzayo ze-sunscreen? Nceda unxibelelane nam ukuba unemibuzo.