Nobel prize merely for concentrating penicillin into a SOLID for therapeutic use ?

Gloria T Sanders (in her 1986 book on amputations of the lower limbs) mentions in passing that Howard Florey was the first to concentrate penicillin into a solid, so it could finally be used in human therapy.

This has become a commonplace in recent years, as a Google search on "Florey" and "concentrated" will quickly reveal, replacing earlier claims that he was the first to "purify" penicillin.

But since the solid penicillin was in fact not a whit more stable than Fleming's original liquid penicillin, if  both were properly stored, it offered no advantages to Fleming's wet stuff and a whole lot of disadvantages.