To determine the proportion of isolated methyl groups (i.e. methyl groups attached to hydrogen-free carbon) in a ground water humic substance (HS), four different techniques were applied: the standard proton spin-echo technique, the 'H-INADEQUATE method, a short version of the latter with a 4 4 puls
Interaction of Formaldehyde with Soil Humic Substances: Separation by GFC and Characterization by1H-NMR Spectroscopy
β Scribed by C. M. Cooke; N. J. Bailey; G. Shaw; J. N. Lester; C. D. Collins
- Publisher
- Springer
- Year
- 2003
- Tongue
- English
- Weight
- 686 KB
- Volume
- 70
- Category
- Article
- ISSN
- 0007-4861
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Conditions are described for the preparative LC separation of a bulk nonoxynol-9 material into 16 components. 1H-NMR analyses of these fractions provided evidence for all but the first of the components to be oligomers of nonylphenoxypolyethoxyethanol (nonoxynol) with n-values for (OCH2CH2)n ranging
## Abstract To prevent the precipitation reaction between glycyrrhizin (**1**) and berberine (**3**) in the decoctions of __Glycyrrhiza__/__Coptis__ rhizome or __Glycyrrhiza__/__Phellodendron__ bark, the presence of cyclodextrin (CD) in the mixture was proven to be effective. The preventing effect