Results 161 to 170 of about 34,090 (203)
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Trace Analysis of Hop Essential Oils in Spent Hop
Journal of the American Society of Brewing Chemists, 2007The volatile constituents of spent hop (obtained by industrial supercritical CO2 extraction) were extracted using the Deryng apparatus and determined by gas chromatography and gas chromatography–ma...
Mirosław Anioł +5 more
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EVALUATION OF HOPS: IX. FLAVOUR OF HOP OIL CONSTITUENTS
Journal of the Institute of Brewing, 1959The presence of whole hop oil in water is detectable by taste at a concentration of 1-0 p.p.m. In beer, a concentration of the whole oil of 3 p.p.m. but not I p.p.m. is recognizable. The oxygenated compounds present in the oil affect the flavour of beer when only 0–3 p.p.m. is present, while 0–1 p.p.m. of the volatile fraction of this material in water
G. A. Howard, R. Stevens
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Nature, 1962
PROGRESS in instrumental methods of analysis during the past 10 years, particularly in the new field of gas chromatography, has provided the chemist with powerful tools for the separation and identification of complex mixtures. Nevertheless, it is often advantageous to fractionate the mixture prior to gas chromatography analysis in order to simplify ...
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PROGRESS in instrumental methods of analysis during the past 10 years, particularly in the new field of gas chromatography, has provided the chemist with powerful tools for the separation and identification of complex mixtures. Nevertheless, it is often advantageous to fractionate the mixture prior to gas chromatography analysis in order to simplify ...
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Journal of the Institute of Brewing, 1966
Methyl geranate has been identified with some certainty in oil from Bullion hops by comparison of infra-red absorption and mass spectral patterns with those of authentic methyl geranate. It has also been found that methyl geranate varies considerably in concentration in oils from different varieties, being almost completely absent from some varieties.
Ron G. Buttery +2 more
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Methyl geranate has been identified with some certainty in oil from Bullion hops by comparison of infra-red absorption and mass spectral patterns with those of authentic methyl geranate. It has also been found that methyl geranate varies considerably in concentration in oils from different varieties, being almost completely absent from some varieties.
Ron G. Buttery +2 more
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EVALUATION OF HOPS V. THE ESSENTIAL OIL OF HOPS
Journal of the Institute of Brewing, 1957The aromatic constituents of hops have been analysed by gas chromatography. The essential oil comprises a mixture of hydrocarbons and of oxygenated materials, these two main fractions being readily separated by chromatography on silica gel. The hydrocarbons, which account for 70–80% of the total oil, comprise mainly myrcene, caryophyliene and humulene ...
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THE OCCURRENCE OF HOP RESINS IN HOP OIL
Journal of the Institute of Brewing, 1966Appreciable amounts of α and β acids have been found in the essential oil obtained by steam distillation of hops.
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Changes in Hop Oil Content and Hoppiness Potential (Sigma) during Hop Aging
Journal of the American Society of Brewing Chemists, 1985This study evaluates the chemical changes in hop oil content and composition during storage of 20 different hop varieties obtained from the hop breeding program at Oregon State University.
Robert T. Foster, Gail B. Nickerson
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Influence of Hop Oil Content and Composition on Hop Aroma Intensity in Dry-Hopped Beer
Journal of the American Society of Brewing Chemists, 2016When hops are added to beer, varying degrees of hoppy aroma persist as a result of cultivar differences and the point of hop addition.
Daniel M. Vollmer, Thomas H. Shellhammer
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THE STABILITY OF HOP OILS IN LIQUID CARBON DIOXIDE EXTRACTS OF HOPS
Journal of the Institute of Brewing, 1983Portions of extracts obtained by treating three varieties of hops with liquid carbon dioxide were stored in the cold and at ambient temperature for 18 months. During this period the composition of nop oils remained stable, except for the formation of two terpene methyl sulphides in extracts from all three varieties.
C. M. Grimmett, T. L. Peppard
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The Aroma of Hops III. The Occurrence of Diterpenes in Hop Oil
Bulletin des Sociétés Chimiques Belges, 1968AbstractTwo diterpene hydrocarbons have been isolated from hop oil. One is camphorene, the other is a hitherto unknown camphorene isomer. These terpene hydrocarbons, now called para and meta camphorene were not signalled before in hop oil.
H. Lammens, M. Verzele
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