Da Sinadaran Wannan Block UVB Radiation
Sunscreens na da muhimmanci kayan aikin fata na amfani da su don hana sunburns, photoaging , da ciwon daji. Har zuwa kwanan nan, an yi imanin cewa hanawa radiation UVB da kunar rana a jiki sune kawai matakan da ake bukata don hana lalatawar lalacewa. An ƙaddamar da bayanin SPF don auna girman ikon sunscreen don toshe UV radiation. Yanzu mun san cewa UVA radiation yana da muhimmanci sosai wajen lalata fata.
Saboda SPF wani ma'auni ne na kariya ta UVB, nau'ikan keɓaɓɓiyar sun bambanta a tsakanin hasken rana wanda ke shafan UVB radiation da kuma wanda ke samar da bidiyon - ko UVA da UVB - kariya. Wadannan sinadaran sunadaran sunada amfani da sunscreens don shafan UVB radiation kawai .
PABA
PABA , ko kuma para-aminobenzoic acid , ya zo ne a kasuwa a Amurka a farkon shekarun 1970s kuma ya kasance tushen farko na gaskiya wanda aka yadu. Duk da haka, yana da kwayar cutar da aka sani kuma tun daga yanzu an fitar da shi daga tsarin da yawa. Ba'a saba amfani dashi a cikin sunscreens yau ba.
- Abũbuwan amfãni: PABA sandunansu tam da kwayoyin halitta a cikin epidermis, kiyaye shi daga yin wanke a cikin ruwa ko ma rubbed kashe tare da tawul.
- Abubuwa mara amfani: Yana haifar da rashin lafiyan halayen kashi 4 cikin 100 na yawan jama'a kuma yana sutura da tufafi.
PABA Esters
Kwararren PABA ne kawai wanda FDA ta amince don amfani a Amurka shine Padimate O , wanda ake kira octyl dimethyl PABA .
Wannan fili yana da kama da PABA, amma ba kamar irritating ba. Da zarar sunadaran sunadarai na PABA suka ci gaba, ƙwarewar Padimate O ya ki da sauri. Kwancen Abun O yana har yanzu a wasu sunscreens saboda ana amfani dashi tare da wasu sunadarai don ƙara SPF na samfurin.
- Abũbuwan amfãni: Yana da ruwa mai tsayayyar kuma ba ya ɗore tufafi.
- Abubuwa masu ban sha'awa: An sani ya haifar da halayen haɗari.
Cinnamas
Cinnam , Octyl methoxycinnamate da cinoxate , su ne mafi yawan amfani da UVB absorbers a Amurka. Ana samun su a cikin kayan shafawa wanda ke da SPF factor.
- Abũbuwan amfãni: Sun kasance masu tasiri na UVB. Lokacin da aka hade shi tare da wasu sunadarai masu "m", sun taimaka wajen sa sunadarai su kara yawan ruwa da barga.
- Abubuwan da ba su da amfani: Suna iya zama fushi. Mutanen da ke da hankali ga balsam na Peru, balsam guda uku, launi na coca, cinnamic aldehyde da kuma man zafin iya kuma kula da kirimarsu.
Salicylates
Salicylates ne salicylateyl salicylate , octyl salicylate , da salicylate triethanolamine . An yi amfani da salicylates na dogon lokaci, ko da kafin PABA. Salicylate na ƙwayar ruwa shine mai narkewa ruwa, don haka ana amfani dashi akai-akai cikin kayayyakin gashi wanda ke karewa daga kamuwa da UV. Homosalate shi ne sinadaran da FDA ta yi amfani dashi a matsayin ma'auni don aunawa SPF.
- Abũbuwan amfãni: Sun kasance mai tsayayyar ruwa da barga a gaban hasken rana.
- Abubuwan da ba su da amfani: Sun kare daga wani ɓangaren ƙananan UVB, don haka dole ne a yi amfani da su a cikin babban taro.
Octoketlene
Ana yin amfani da octoketlene sau da yawa don inganta zabin yashi, mai shayar da UVA, kuma yana da samuwa a cikin samfurori waɗanda ba su da magunguna.
Yana daya daga cikin 'yan shafukan UV wanda za a iya amfani dashi a cikin gel sunscreens.
- Abũbuwan amfãni: Yana da wuya ya ba da fata fata.
- Abubuwa masu ban sha'awa: Dole ne a hade shi tare da sauran fina-finai na UV don sa ya zama barga kuma yana da tsada don samarwa.
Tabbatar
Ensulizole ko PBSA shi ne ruwa mai narkewa, don haka ana amfani da shi a yawancin masu yawan moisturizers. Yana yin aiki mai kyau na katange hasken UVB, amma ba ya toshe kowane hasken UVA. A UVB filters da aka jera a sama toshe kananan adadin UVA radiation.
- Abũbuwan amfãni: Yana da wuya sa fata hangula.
- Disadvantages : Yana tubalan wani kunkuntar band na UV radiation.
Sources:
Lautenschlager, S, HC Wulf, da MR Pittelkow. "Photoprotection," Lancet. 370 (2007): 528-37.
Nguyen, Nathalie, da Darrell Rigel. "Hanyoyi da kuma Rigakafin Photocarcinogenesis." Cosmetic Formulation of Skin Care Products. Ed. Zoe Draelos & Lauren Thamon. New York: Taylor & Francis, 2006. 156-9.
Palm, MD, da MN O'Donoghue. "Ɗaukaka a kan kyamarar hoto". Dermatol Ther. 20 (2007): 360-76.