In an aqueous solution, you will have significant loss of IAA in a
couple of weeks even with standard refrigeration; I can not remember
the number, but the late Bruce Stowe of Yale measured this carefully.
I believe ABA will be similar, but CK will last longer until microbes
get in the solution. Often, users have an excess of hormone, so they
still get physiological effects. Freezing the solutions will help, but
you need to be sure to redissolve any precipitated material. If you are
doing precise work, it would be best to make new solutions, not much
effort.
A tiny grain of thymol is an antimicrobial wonder and does not
interfere with most uses.
Quoting Bob Wise <wise At uwosh.edu>:
> I am setting up my plant physiology teaching labs for the spring
> semester and am wondering if I can make up stock solutions of IAA,
> ABA, and CK and then store them for repeated use throughout the
> 14-week semester. Does anyone have any experience with this? What
> about KCN, NaN3, or CCCP? What are their long-term storage options?
>> Bob
> --
> Robert R. Wise
> Dept. of Biology
> UW Oshkosh
> 800 Algoma Blvd
> Oshkosh, WI 54901
> (920) 424-3404 (tel)
> (920) 424-1101 (fax)
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