Solvent impurities in NMR spectra

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>> Monday, September 13, 2010

In my previous post 'here', I have written on how to clean NMR tube to get clean spectra. If NMR tube is not properly dried in oven before use, there will be many confusing solvent peaks in the spectra. Also, when the sample is not properly dried and the NMR solvent is contaminated, you can easily get those unwanted solvent peaks. To make your work easy to differentitate the solvent peaks, paper including chemical shift values of common laboratory solvents has been reported. It's nice update to this paper published back in 1997. 
But it is suggested to properly dry NMR tube, sample and prevent NMR solvent from contamination to avoid these solvent peaks. What do you think? Let us know your view.


Gallotannin (Penta-O-Galloyl-beta-D-glucose) against Breast Cancer

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>> Friday, September 10, 2010


Breast cancer awareness

Breast cancer (BCa) is one of the major causes of cancer-related deaths in women. Most of BCa express estrogen receptors (ER) and/or progesterone receptors, and some have amplified human epidermal growth factor receptor (HER-2) proto-oncogene and express high levels of the HER-2 protein. In some cases, BCa lacks all these expressions referred as “triple negative BCa”. This subtype is clinically characterized as more aggressive and less responsive to standard treatment and associated poorer overall patient prognosis.



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