Natural Science Forum / Chemistry / Analytical Chemistry / March 2004

Hi, I'm interested in Isoflavones determination more specific Genistein and
Diatzein in soy products.
Do you know any laboratory in Europe able to do that determination?
Thanks in advance

I am an author writing a novel whose plot deals with
defacing a large white marble building with Silver Nitrate
solution. I am told that when human skin is exposed to
silver nitrate that it will turn a deep purple color...and last for several

We have been analysing mercury in nitric acid digested fish tissue  by
CVAAS but we want to switch to CVAFS instead. We are however
encountering problems with poor precision.
We are using a PSA Millenium instrument and SnCl2 redudctant.

At our laboratory we are using a lot of chloroform (ca 10liter/day)
for cleaning laboratory glassware. In this glassware we dissolve
polymer in cresol for e.g. viscosity measurements. Also the viscosity
meters are rinsed with chloroform.

A colleague and I are attempting to validate an HPLC impurities method
for a drug substance we're working on.  During robustness testing, we
suddenly observed an extra, never-before-seen peak eluting immediately
after our active peak, with a resolution of < 1.5 and a relative peak

would appreciate some help.  what is the chemical(s) that are
responsible for 'fresh' or 'clean' odors or perfumes in products such
as soaps or shampoos or perfumes?
thanks