In episode 194 of Semantic Mastery's weekly Hump Day Hangouts, one participant asked about the requirements for passing link juice using a 301 redirect.
The exact question was:
2. If I am using my own site and 301 redirecting to the above shown site to pass the ling juice, are the only requirements that the site I am passing link juice to be optimized for meta for the pages I am passing juice to and trying to rank? Thanks guys for what you do. I think it's time for me to jump back into Mastermind soon!!!