Mabel,
Thanks for the quick reponse. I found a research on PUBMED (Coagulant stability and sterility of thawed S/D-treated plasma), looks like the topic about the stability of factors at roomtemp has been researched.
this is the link : http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?itool=abstractplus&db=pubmed&cmd=Retrieve&dopt=abstractplus&list_uids=15569070
I really appreciate your ideas.