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31.
D. G. Lance A. W. White R. P. Hildebrand B. J. Clarke 《Journal of the Institute of Brewing》1975,81(5):364-367
The effect of heat (1 hour at 110°C) on a range of solid metal salts of humulone has been examined. Some salts, e.g. those of calcium, magnesium, cobalt (II) and nickel (II) undergo isomerization to the corresponding salt of isohumulone without any significant degradation. Other metal salts undergo partial isomerization without apparent degradation and some form both isohumulone and uncharacterized degradation products. The salts of aluminium, chromium (III), copper (II), lead (II) and mercury (II) show no formation of isohumulone. Under the same conditions the lead (II) salt of isohumulone was unique in converting completely into the lead (II) salt of humulone. 相似文献
32.
A method is described which allows the separation of hop bitter components and derivatives present in hop extracts by thin-layer chromatography on a mixture of silica gel and cellulose. This method can be used to evaluate the purity of hop extracts, isomerized hop extracts and complementary base extracts. 相似文献