Method for determining an integral sun protection factor encompassing UVA and UVB radiation

Method for determining an integral sun protection factor encompassing UVA and UVB radiation

  • CN 1,997,910 B
  • Filed: 04/14/2005
  • Issued: 03/21/2012
  • Est. Priority Date: 04/22/2004
  • Status: Active Grant
First Claim
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1. definite beauty treatment type sun-screening agent and the method for controlling the integration SPF that comprises UVA and UVB radiation (∫

  • SPF) of skin disease type sun-screening agent, said method comprises the steps;

    (a) confirm that with one the said sun-screening agent of amount directly is applied to the dermal matrix of a definite area, this dermal matrix is in advance by the known substance dipping that plays spin trapping agent effect;

    (b) through solar simulator said dermal matrix is exposed to a definite radiation of measuring, this radiation comprises UVA and the UVB ray under the nature sun exposed condition;

    (c) electron spin resonance (ESR) measurement was carried out to the said dermal matrix that is exposed to radiation in 1-120 minute in the exposure back;

    (d) with after the known master sample of number of free radicals is compared with said free radical formation value RG standardization, and captive number of free radicals is recorded as actual number X * 10 12/ 1mg sample is RG=X * 10 12Free radical/mg dermatological specimens;

    (e) and according to formula (1) confirm said integration SPF ∫

    SPF;

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