Results 141 to 150 of about 713,742 (183)

The Chemistry of the Hop Resins

, 1967
The 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 ...
P. Ashurst
semanticscholar   +2 more sources

Chemistry of hop constituents. Part XXXIV. Methylation of some hop resins

Journal of the Chemical Society C: Organic, 1969
The 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. Elvidge
semanticscholar   +2 more sources

AUTOMATIC ANALYSIS OF HOP RESINS BY ION EXCHANGE CHROMATOGRAPHY

Journal of the Institute of Brewing, 1972
Ion 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. Otter, D. Silvester, L. Taylor
semanticscholar   +2 more sources

ELECTROPHORETIC SEPARATION OF HOP RESINS AND THEIR TRANSFORMATION PRODUCTS

Journal of the Institute of Brewing, 1961
Paper 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
semanticscholar   +2 more sources

Ion-Exchange Chromatographic Assay for Hop Resins and Hop Extracts

Proceedings. Annual meeting - American Society of Brewing Chemists, 1968
E. Kokubo, Y. Kuroiwa, K. Oda
semanticscholar   +2 more sources

Antimicrobial Activity of Lignin-Based Alkyd Coatings Containing Soft Hop Resins and Thymol

Coatings
The growing concern over the transmission of pathogens, particularly in high-risk environments such as healthcare facilities and public spaces, necessitates the development of effective and sustainable antimicrobial solutions.
I. Etxeberria, J. Garcia, A. Ibáñez, A. García-Moyano, A. I. Paniagua-García, Yuleima Díaz, R. Díez-Antolínez, Aitor Barrio   +7 more
semanticscholar   +1 more source

STABILITY OF RESINS IN PELLETISED HOPS

Journal of the Institute of Brewing, 1979
The 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, T. E. Kavanagh, B. J. Clarke   +2 more
openaire   +1 more source

Hop maturation and resin formation: Field trials

Journal of the Science of Food and Agriculture, 1974
AbstractThe 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, Terence E. Kavanagh, Robert P. Hildebrand, Brian J. Clarke   +3 more
openaire   +1 more source

Hop maturation and resin formation. Effects of extended harvestings on subsequent hop crops

Journal of the Science of Food and Agriculture, 1975
AbstractCommercial 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, Terence E. Kavanagh, Graham A. Hughes, Robert P. Hildebrand, Brian J. Clarke   +4 more
openaire   +1 more source

Antibacterial action of hop resin materials

1991
Abstract 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.
openaire   +1 more source