Dear Dr. Peter Kapusta, actually, I'm actually do the sensor testing based on the chitosan as sensing materials. The film sensor that I've been made and based on the literature review studied, the chitosan film will degrade over the time. So, I want to know the lifetime of the chitosan film in terms of how long we can use chitosan film as sensor before it started to degraded. Thanks. :-)

salam

I guess this article will help u to answer ur question

Thanks @Mohammed Mohammed . Really appreciate it!