I thought the same thing, but when I checked a number of suppliers of agar agar,
I noted that they indicated that this was a good source for iodine.

http://www.vegsoc.org/info/gelling.html
http://www.bulkfoods.com/agar_agar.htm

Natural agar agar is unflavoured producing a firm, clear jelly and is rich in
iodine and trace minerals and has mildly laxative properties.

http://www.bulkfoods.com/agar_agar.htm

Perhaps the trace elements in agar such as iodine provide nutrients for the
cultures.  I was unable to find a chemical formulea for agar, just that it was a
polysaccharide complex called lentinan.

Marshall

Garnet wrote:

> Guess I missed the part about iodine allergy. Agar is a purified
> product, particularly that sold by scientific supply houses. It is used
> as a base media for cell culture. I would be very surprised if there is
> any iodine content in this form, as it would skew the results of any
> attempt to grow microbes or tissue cultures.
>
> Garnet
>
> On Sat, 2004-02-14 at 23:32, sol wrote:
> > Garnet,
> >   That doesn't help either, sorry. It is iodine I am allergic to, so no
> > seaweed products or seaweed thickeners at all. However, for immediate
> > use, I wonder if flaxseed meal would work? or Fenugreek? SlipperyElm? or
> > maybe guar gum or xanthan gum.
> > Geez, I hope neither of those are seaweed products so far as I can find
> > out they are not..
> >    Actually though sloppy, I don't mind a liquid, it probably isn't
> > worth the trouble to me to make a gel.
> >
> > paula
> >
> > Garnet wrote:
> >
> > >You can make a "gel" with Agar agar, a seaweed. I have found it at Whole
> > >Food Stores. It is used as a vegan substitute for gelatin which is
> > >extracted from cow hooves.
> > >
> > >Garnet
> > >
> > >On Sat, 2004-02-14 at 16:48, sol wrote:
> > >
> > >
> > >>Oh, crud. No carrageenan for me. Drat. It is a good thing the aloe juice
> > >>works well.
> > >>Thanks for looking and posting the info.
> > >>paula
> > >>
> > >>
> > >>Garnet wrote:
> > >>
> > >>
> > >>
> > >>>I looked a bottle of the organic Aloe Gel I used to use. It is by Lily
> > >>>of the Desert (not Lily of the Valley as I previously stated on this
> > >>>list).
> > >>>
> > >>>Carageenan is used as a thickening agent. www.lilyofthedesert.com is
> > >>>thier website. Perhaps they can answer your questions.
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>
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