How long a 0.2 mM DPPH free radical solution can be used?

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Ider Soufian

until on week, if your solution is covered with aluminium foil, whereby the loss of free radical activity may be reduced about 2-4 per cent

per week.

Dhaval Makawana

i would recommned you to do fresh soln every time when you r going to set your experiment but for just try and and check the compatibity of compund whether it is antioxidant or not you can you it sa per ider soufian say. i find the same problam when i use previous stock soln of DPPH to carry my experiment next day. you will find less absorbance in control soln.