Results 181 to 190 of about 4,224 (203)
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ELECTROPHORETIC SEPARATION OF HOP RESINS AND THEIR TRANSFORMATION PRODUCTS
Journal of the Institute of Brewing, 1961Paper electrophoresis can be used to differentiate hop resins including humulone, lupulone, hulupone and their oxidation and conversion products, and satisfactory conditions for such separation are described.
I C Macwilliam
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AUTOMATIC ANALYSIS OF HOP RESINS BY ION EXCHANGE CHROMATOGRAPHY
Journal of the Institute of Brewing, 1972Ion exchange chromatography has been used to provide a quantitative automatic analysis of lupolunes, humulones, humulinic acid, iso-α-acid and hulupones. The resins are extracted and chromatographed on a column of Q.A.E. Sephadex in the acetate form, using an acetic acid gradient in methanol as eluent.
G. E. Otter, D. J. Silvester, L. Taylor
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Ion-Exchange Chromatographic Assay for Hop Resins and Hop Extracts
Proceedings Annual Meeting - American Society of Brewing Chemists, 1968Eiichi Kokubo +2 more
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STABILITY OF RESINS IN PELLETISED HOPS
Journal of the Institute of Brewing, 1979The α-acids content and Lead Conductance Value of hop pellets, manufactured from seedless Pride of Ringwood hops grown in Australia and stored at 5°C, 20°C or 30°C, were monitored over a twelve month storage period. No decrease in α-acids content occurred during storage at 5°C, whereas at 20°C the decrease (ca.
R. N. Skinner +2 more
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Chemistry of hop constituents. Part XXXIV. Methylation of some hop resins
Journal of the Chemical Society C: Organic, 1969The hop resins colupulone and cohulupone have been methylated using diazomethane and methyl iodide. O-Methylation was obtained with diazomethane, colupulone giving mainly 6-isobutyryl-5-methoxy-2,2,4-tri-(3-methylbut-2-enyl)cyclohex-4-ene-1,3-dione, together with a number of minor products probably corresponding to the many enol forms possible ...
B. E. Connett, J. A. Elvidge
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Antibacterial action of hop resin materials
1991Abstract The antibacterial properties of hop resins has been shown to result from their ability to act as ionophores (ion-carriers). The resins conduct protons (and other ions) across cell membranes of sensitive bacteria causing inhibition of nutrient transport.
W J Simpson, J R M Hammond
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The Chemistry of the Hop Resins
1967The hop plant (Humulus lupulus, H. americanus etc.) has for centuries been employed to give flavour to fermenting liquors. It is best known as the principal source of the aroma and bitter flavour of beer, and the hops which today are used for this purpose are cultivated plants which have been developed by continuous selection over at least the last ...
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Hop maturation and resin formation: Field trials
Journal of the Science of Food and Agriculture, 1974AbstractThe resin and essential oil contents of hops (Humulus lupulus L., var., Pride of Ringwood) together with cone weight were studied over a period of 4 weeks prior to and 1 week subsequent to the estimated time of normal harvesting. The petrol ether‐ and methanol‐soluble fractions of the hop cone showed no significant change during this period ...
Raymond N. Skinner +3 more
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Hop maturation and resin formation. Effects of extended harvestings on subsequent hop crops
Journal of the Science of Food and Agriculture, 1975AbstractCommercial harvestings of hops (Humulus lupuhlus L, var., Pride of Ringwood) were conducted over a 5 week period encompassing normal harvest time. The effect on yield and α‐acid content of the crop was determined, as was the effect on the subsequent crop.
Raymond N. Skinner +4 more
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Influence of Mineral Nutrition on the Resin Content of the Hop Cone
Nature, 1952THE influence of manuring on the resin content of the hop cone (strobile) has been the subject of a number of investigations. Doerell1 concluded from German and Czecho-Slovakian experiments that the resin content rose when potassium and phosphorus were applied in excess of nitrogen, and more recently Zattler2, in Germany, has stated that phosphorus has
F. C. THOMPSON, A. H. BURGESS
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