Dear Spinlanders,
Have 200 MHz proton data on low concentration polysaccharide in 99.9% D2O
with no reference compound. Main peak in standard acquisition is -OH from
0.1 % H2O and polysaccharide -OH's.
Have data acquired over 120 hours with presaturation of water with decoupler
channeled through transmitter. AC-200 system with O1=O2 modification. This
data set has broad peak ( 4 ppm ) centered at 6.2 ppm. Assume that this is
due to water adsorbed onto probe coil supports and surface of nmr tube. Don't
have dry nitrogen supply to run spin turbine and VT unit. Relative humidity
in lab is 40-50%.
Have tried zeroing first data points to get rid of rapidly decaying solid
water signal. Get severe baseline roll and phase problems. Any suggestions
for removal of broad hump while maintaining integrity of rest of data?
Will collect and repost useful responses.
Thanks,
Regards,
Lawrence
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Numare Spectralab, Inc.,
10 Summit Avenue, Unit 6, P.O. Box 96,
Berkeley Heights, NJ, 07922-0096,
Telephone 908-665-0066
Telefax 908-464-4192
Name: Lawrence Byrnes
E-mail: numare@cnj.digex.net (Lawrence Byrnes)
www: http://www.cnj.digex.net/~numare/
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