Dear Zakaria

The attached article may help you for understating of various method utilized for assessing anti-ageing property.

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=4129501&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F4129446%2F4129447%2F04129501.pdf%3Farnumber%3D4129501

In vitro antioxidant properties evaluation of 10 Iranian medicinal plants by different methods.Moein S, Medicinal plants contain chemical compounds which possess antioxidant activities. Natural antioxidants are mainly phenolic compounds. The methods mostly used to determine antioxidant activities are divided into two main groups. First method based on one electron transfer reaction, which a change in color occurred when the oxidant compound was reduced. Second method based on one hydrogen transfer reaction and competition between antioxidant and substrate (probe) for free radicals was occurred. Huang D, Ou B, Prior RL. The chemistry behind antioxidant capacity assays. J Agricultu Food Chem. 2005;53(6):1841–56. doi: 10.1021/jf030723c . I hope these articles could help.

Thank you neeraj and ayub. I already have the article that you suggested. Currently, I am studying medicinal plants that have antiaging properties.Most of medicinal plants that I am studying have antioxidant potential...I am looking for other assessment methods from what i have listed for skin aging...