Zosakaniza Zisanu ndi Zisanu zozizira zomwe zimateteza UVA Mazira
Mwinamwake mwamva kuti zina zoteteza dzuwa sizidzakutetezani mokwanira ku zowononga za dzuwa ndipo kuti muyenera kumvetsa kuposa nambala yomwe yayikapo. Ndemanga izi ziri zoona, ndipo nkofunika kudziphunzitsira nokha pa zosakaniza zomwe mukusowa muwotchi. Tiyeni tiwone chifukwa chake ndizo, ndi zomwe muyenera kudziwa musanayambe kugula dzuwa.
Chitetezo cha Sun ndi UV Ray
Maswiti a dzuwa ndi ofunika mankhwala osungira khungu omwe amagwiritsidwa ntchito popewera photoaging ndi khansa ya khungu. Kufikira posachedwapa zinkakhulupirira kuti kutseka mazira a UVB ndi kutentha kwa dzuwa ndizo zokha zofunikira kuti zisawononge dzuwa. Mlingo wa SPF unapangidwa kuti udziwe kuthekera kwa dzuŵa loteteza dzuwa kutseka ma radiation a UVB.
Tsopano tikudziwa kuti miyendo ya UVA imapangitsanso khungu. Ngakhale kuti FDA idapanga dongosolo loyendera zomwe zimakudziwitsani bwino momwe dzuwa limatetezera UVA, pempholi silinavomerezedwe. Mwatsoka, njira yokhayo yodziwira za mphamvu ya UVA-kutseka khungu la dzuwa ndiko kuyang'ana limodzi mwa zosakaniza izi.
Zisamba Zomwe Zimaletsa UVA Mazira
Mukayang'ana khungu la dzuwa, m'pofunikira kuti muwerenge chizindikirocho ndipo onetsetsani kuti chimodzi mwazidutswa zomwe tazitchula apa zili pandandanda. Musamakhulupirire ma phukusi omwe amati chitsulo cha dzuwa ndi "chabwino" kapena "chokwanira." Pangani chisankho chanu chophunzitsidwa pogwiritsa ntchito kafukufuku wanu.
Mwinanso mutha kuyang'ana njira zosiyanasiyana zomwe zingateteze mazira a UVA kuti mudziwe kuti ndi ziti zomwe zikugwirizana ndi zosowa zanu.
Avobenzone
Avobenzone (Parsol 1789) ndi mankhwala okhawo omwe amachotsa mtundu wonse wa UVA kuyambira 310-400 nm. Sipereka mtundu uliwonse wa kuyamwa kwa UVB.
Vuto ndi avobenzone ndilokuti limatuluka dzuwa. Ndipotu, 50 mpaka 90 peresenti ya sunscreen iyi imatayika ora limodzi mutatha kuwala kwa dzuwa. Zina mwazovala za UVB monga OMC ndi octorylene zimapangitsa avobenzone kukhala yolimba kwambiri.
- Zopindulitsa: Zimateteza mabala onse a UVA ndipo sizimayambitsa khungu
- Zowonongeka: Zimathera mofulumira dzuwa litaphatikizidwa pamodzi ndi ena a UVB blockers
Benzophenones
Benzophenones, oxybenzone, ndi dioxybenzone ndi thumba losakaniza la zabwino ndi zoipa. Amagwiritsa ntchito nsalu zokhazokha osati zogwiritsa ntchito zowononga komanso zowonjezera. Ndizo zotengera zabwino za UVA koma zimatenganso mtundu wa UVB. Benzophenones sizowopsya ngati PABA koma oxybenzone ndizovuta kwambiri zowonjezera dzuwa pa msika tsopano.
- Zowonjezera: Zimateteza miyendo yambiri ya UV kuphatikizapo UVA
- Zowonongeka: Kukhumudwitsa osati kukana madzi
Helioplex
Helioplex ndi fomu yothandizira ndi Johnson & Johnson Neutrogena. Malemba atsopanowa ndi ophatikizira osiyanasiyana a UVA ndi UVB ophatikizapo zinthu zolimbitsa thupi zomwe zimapangitsa kuti zinthu zowonongeka zowonongeka zisagwe. Ndiwotchi ya dzuwa, yomwe imakhala yosasangalatsa.
Icho chimabwera mu SPF ya 55, 70, ndi 85. Zomwe zimagwira ntchito ku Helioplex ndizoziganizira:
- Avobenzone (3 peresenti)
- Oxybenzone (6 peresenti)
- Mafilojekiti (2,8 peresenti)
- Kusagwirizana (10 peresenti mu SPF 55 ndi 15 peresenti mu SPF 70)
- Lembani (5 peresenti)
Mexoryl SX (Ecamsole)
Mayina ena a pulojekitiyi akuphatikizapo terephthalylidene dicamphor sulfoic acid (TDSA), ecamsule, ndi Anthelios SX. L'Oreal Paris inakhazikitsa mexoryl ndipo yakhala ikugwiritsidwa ntchito ku Ulaya kuyambira 1982. Mu 2006 a FDA anavomereza ntchito yake ku United States. Chiphatikizapo avobenzone ndi octocrylene ndipo amagulitsidwa ku US ndi La Roche Posay monga Anthelios SX.
Mpukutu wa dzuwa ndi wotsekemera kwambiri womwe umakhala wosagwira madzi, wosasunthika padzuwa, osati wokwiyitsa khungu. Zosakaniza zowonjezera ku Anthelios SX ndizoyikira:
- Ecamsule (2 peresenti)
- Avobenzone (2 peresenti)
- Mafilojekiti (10%)
Mera
Meradi imaphatikizapo mankhwala omwe amagwiritsa ntchito menthyl anthranilate omwe amapereka mauthenga otsutsana ndi mazira a UVA ngakhale kuti kufalikira sikuli kwakukulu monga Mexoryl kapena benzophenones.
Titaniyamu Dioxide ndi Zinc Oxide
Titaniyamu dioxide ndi nthaka okusayidi amaonedwa kuti dzuwa limakhala m'malo mwa sunscreens. Amapereka chitetezo ku mazira a UVA koma amalephera ndi maonekedwe awo opaque. Zitetezo zimagwira ntchito ngati zowonongeka, zosonyeza kuwala kwa dzuwa kumbuyo kwa khungu.
Kodi Zitetezi Zitani Zomwe Zimalepheretsa (Zina Kuposa Khansa Yapakhungu) - The Caveat
Tonse tamva zambiri zokhudza kufunika kwa dzuwa, koma zomwe zimalandilidwa kwambiri ndi chimodzi mwa zinthu zoipa zomwe zimapangitsa kuti mazira oyaka moto asafike pakhungu lathu.
Pali maphunziro ochuluka omwe amasonyeza kuti kupeza vitamini D okwanira kumathandiza kupewa mitundu yoposa 27 ya khansa, kuphatikizapo melanoma , komanso kuteteza dzuwa kuteteza osati kutentha kwa dzuwa kokha koma kutulutsa vitamini D kudzera pakhungu.
Izi sizikutanthauza kudumphira dzuwa. Lankhulani ndi dokotala wanu. Madokotala ena amalimbikitsa kuchepetsa kugwiritsa ntchito khungu la dzuwa mpaka mutakhala dzuwa 10 mpaka 15 mphindi-nthawi yomwe imatengera kuti mulandire mlingo wathanzi wa vitamini D. Mabungwe angapo a zamkati amalingalirabe zowonjezera zowonjezera zowonjezera dzuwa.
Ziri zovuta kupeza vitamini D onse omwe mukufunikira mwa kudya nokha, ngakhale mavitamini D3 owonjezera ndi njira ina yowonjezeramo vitamini D. Chinthu chabwino kwambiri ndi chakuti mutha kupeza ngati mukusowa vitamini D zambiri ndi mayeso a magazi. Kumbukirani kuti maonekedwe ake ndi aakulu kwambiri. Mwachitsanzo, labu lanu linganene kuti mlingo wa 30 mpaka 80 ndi wabwinobwino, komabe kafukufuku wina amasonyeza kuti masentimita 50 mpaka 80 ndi abwino kuchepetsa chiopsezo cha khansa. Choncho nthawi zonse funsani nambala yanu. Mavitamini D okwanira akhoza kukuthandizani kuchepetsa chiopsezo cha khansa, koma kuchulukako kungabweretsereni impso zopweteka. (Inde, mbali imodzi ya kukongola kwa vitamin D kuchokera ku dzuwa ndikuti simungapeze zambiri.)
Zotsatira:
Freitas, J., ndi L. Gaspar. In Vitro Photosafety ndi Efficacy Screening ya Apigen, Chrysin, ndi Beta-Carotene kwa UVA ndi VIS Protection. European Journal ya Sayansi ya Sayansi . 2016. 89: 146-53.
Stiefel, C., ndi W. Schwack. Kujambula Photoprotection mu Kusintha Nthawi - UV Kuwonetsa Mphamvu ndi Kutetezeka, Kukonzekera Kukonzekera ndi Zinthu Zowonetsera. International Journal of Cosmetic Science . 2015. 37 (1): 2-30.