[Fwd: Re: ORGLIST: flavor of cola and GC]

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From: David O'Dell (dko$##$ou.edu)
Date: Tue Oct 03 2000 - 08:53:30 EDT

bahman,

Flavor is an interesting property and somewhat hard to quantify. I
recently read parts of a book on flavor chemistry entitled Flavor
Chemistry- Industrial and Academic Research by Sara J. Risch and
Chi-Tang Ho ( ACS symposium series 756 ISSN:0097-6156; 756) which
details in Chapter 9 the use of GCO (Gas-chromatography-odor) analysis,
read this chapter. Chapter 10 talks about applying 'Psychophysical
Laws'? for such measurements, and has this strange diagram of a plastic
sample tube shoved up someones nose, it then enters an MS instrument?
It doesn't seem to be a very exact science; its easy to understand why,
given the fact that you are dealing with a sense perception that is not
well understood. Its nice to see someone conducting this type of
research, it seems that serious flavor chemistry has almost disappeared
outside food preservers in industry. I found the biosynthesis and the
cheese odor constituents chapters most interesting, did you know
skatole (3-methylindole) is a component of cheese flavor? It smells
like crap by itself, but I still like cheese.

Good Luck,

David O'Dell

Univ. Of Oklahoma
Dept. of Chemistry

bahman elyasi wrote:

> Hi all:
>
> I want to know that how we can detect off-flavor of cola flavor,
> I am an M.S. student,and i put cola flavor in different enviromental
> conditions-sunlight,tempeture=5,15,38'c,...
> I did GC test ,but unfortunately after 1 month and 2 month
> nothing have been seen,although the odor of flavor was changed!!
> Is GC capable for testing this matter?
>
> THANKS
>
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