ORGLIST: RE: Everybody Digest, Vol 13, Issue 6

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From: Ravi Orugunty (rorugunty$##$oragenics.com)
Date: Wed Oct 12 2005 - 14:37:38 EDT



Hi aneesh regarding Aspartame,
Seems to me the perchloric acid titration is a titration that is done in
acetic acid a standard non-aqueous titration method used to quantified weak
bases. Water is a major problem and will lead to false results usually low
results. what is the moisture content of the final product ? if the answer
is yet which is usually the case with chewing gum you might have to treat
your product sample with a slight excess of acetic anyhdride for several
hours and this should get rid of the water and give you reasonable
titrations.
good luck
ravi


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Today's Topics:

   1. aspartame analysis in chewing gum (anish ganesh)
   2. Resolution of 1,2-diaminocyclohexane (JONAS SUNDBERG)


----------------------------------------------------------------------

Message: 1
Date: Tue, 11 Oct 2005 09:54:08 -0700 (PDT)
From: anish ganesh <anishganesh$##$yahoo.com>
Subject: ORGLIST: aspartame analysis in chewing gum
To: everybody$##$orglist.net
Message-ID: <20051011165408.79559.qmail$##$web30215.mail.mud.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"

Hi friends,

I want to discuss you and get your opinion about the aspartame analysis. We
are following the procedure of British standard for the aspartame analysis
and it is applicable to food samples like jam, preservatives, marmalad,
yoghurt, jelly, fruits...actually we applied exactly the same procedure for
doing the analysis in chewing gum and found different result every time. So,
when we checked the solubility of the product in BP, it is clearly
highlighted that aspartame solubility is depending on pH and temperature and
sparingly soluble. Whereas the standard aspartame what we taken is highly
soluble in hplc water. How can this be highly contradictory?.

So, as per BP method, we have done the perchloric acid titration for
determination in the chewing gum also. But we are not getting correct
result, against the additon of 3500ppm, its giving only 2200ppm. When I
checked the production department for information about coating, I got the
feed back that the temperature they employing is only 22 degree celsius and
whole production is in air conditioned zone. and the intial conversion of
aspartame to fluid is done with gum arabic. So there is no possibility of
degradation to diketo piperazine.

Can any one help me to do the aspartame analysis correctly?.

Waiting for your suggestions,

Regards,
anish


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Message: 2
Date: Tue, 11 Oct 2005 20:18:34 +0200 (CEST)
From: JONAS SUNDBERG <gussujon$##$student.gu.se>
Subject: ORGLIST: Resolution of 1,2-diaminocyclohexane
To: everybody$##$orglist.net
Message-ID: <21568796.1129054714990.JavaMail.oracle$##$goop.it.gu.se>
Content-Type: text/plain; charset=ISO-8859-1

 Hi!
I need the mechanism for resolution of racemic 1,2-diaminocyclohexane using
L-(+)-tartaric acid.
It's for a report for a student lab we did, but I can't find any information
about the mechanism and I've searched journals, textbooks and Google. Any
pointers and tips are appreciated!

/Jonas


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