Re: Autoclaving gum and gelatin

From: Judy Seigel ^lt;jseigel@panix.com>
Date: 02/04/05-08:36:02 PM Z
Message-id: <Pine.NEB.4.61.0502042127340.15357@panix2.panix.com>

On Wed, 2 Feb 2005, Sandy King wrote:

> Well, deja vu all over again. I thought we had put this puppy to rest with
> previous discussions. My experience is that raising the temperature of a
> gelatin solution to 140 F for a relatively short period of time (say two
> hours or less) does not break it down. However, if one were to keep the
> temperature of the gelatin at 140 F or higher for a long period of time
> (four hours or more) , or go through several cycles of heating and cooling
> the solution, it will break down.

I suppose I should have known that mentioning a particular temperature
would get me "corrected." But if you recall I was replying to a question
about AUTOCLAVING, which the gentleman said involved heating the gelatin
via overpressurized steam to bring solutions or objects to or even above
120 centigrade... That's well beyond boiling -- and for a duration of
time.

(Talk about resting your puppies !)

Judy

>>
>> Gelatin raised above about 140 F is useless for sizing purposes if that's
>> what you have in mind -- it breaks down. Whether it would serve some other
>> purpose (glue, skin treatment, whatever) has not AFAIK been described.
>>
>> Judy
>>
>
Received on Fri Feb 4 20:36:12 2005

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