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To those purchasing rapamycin powder online... are you storing it at -20°C w/o humidity?
I ask because I googled this:
"rapamycin" "certificate of analysis" filetype:pdf
and I noticed that all of them recommend storage at -20°C
Example:
Store desiccated at -20°C. HYGROSCOPIC! PROTECT FROM LIGHT & MOISTURE!
source: https://agscientific.com/media/upload/pdf/R-1018,%20E1381H.pdf
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Short term storage (weeks): 0 – 4 oC under dry condition
Long term storage (months): -20 oC under dry condition
source: https://www.medkoo.com/uploads/product/Sirolimus__Rapamycin_/coa/CoA-Sirolimus-C20R03B18.pdf
etc.