Improving the Isotretinoin Photostability by Incorporating in Microemulsion Matrix

Table 3

Rate constants* of photodegradation for ITN in methanol solution and microemulsion (𝑛=3).

Drug	Sample matrix	K	𝑡0.5	𝑅^2
ITN	Methanol solution	8.06×10^−3	86	0.9830
	Microemulsion	1.84×10^−3	377	0.9899
	formulation

^∗𝑡 is expressed in minutes.