Studies on the Delta Resin of Hops: I. Isolation and Preliminary Fragtionation of Δ Resin and Some Observations Respecting Its Nature and Composition

Jackson, C. P.; Walker, T. K.

doi:10.1002/j.2050-0416.1959.tb01687.x

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Jackson and Walker were able to separate the total δ ‐resin into several non‐crystalline fractions. In their preliminary fractionation of the δ ‐resin by column chromatography, they isolated six fractions ( δ I– δ VI).…”

Section: Hop Chemistrymentioning

confidence: 99%

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Humulus lupulus- a story that begs to be told. A review

Schönberger²,

et al. 2014

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The hop cones of the female plant of the common hop species Humulus lupulus L. are grown almost exclusively for the brewing industry. Only the cones of the female plants are able to secrete the fine yellow resinous powder (i.e. lupulin glands). It is in these lupulin glands that the main brewing principles of hops, the resins and essential oils, are synthesized and accumulated. Hops are of interest to the brewer since they impart the typical bitter taste and aroma to beer and are responsible for the perceived hop character. In addition to the comfortable bitterness and the refreshing hoppy aroma delivered by hops, the hop acids also contribute to the overall microbial stability of beer. Another benefit of the hop resins is that they help enhance and stabilize beer foam and promote foam lacing. In an attempt to understand these contributions, the very complex nature of the chemical composition of hops is reviewed. First, a general overview of the hop chemistry and nomenclature is presented. Then, the different hop resins found in the lupulin glands of the hop cones are discussed in detail. The major hop bitter acids (α-and β-acids) and the latest findings on the absolute configuration of the cis and trans iso-α-acids are discussed. Special attention is given to the hard resins; the known δ-resin is reviewed and the ε-resin is introduced. Recent data on the bittering potential and the antimicrobial properties of both hard resin fractions are disclosed. Attention is also given to the numerous essential oil constituents as well as their contributions to beer aroma. In addition to the aroma contribution of the well-known essential oil compounds, a number of recently identified sulfur compounds and their impact on beer aroma are reviewed. The hop polyphenols and their potential health benefits are also addressed. Subsequently, the importance of hops in brewing is examined and the contributions of hops to beer quality are explained. Finally, the beer and hop market of the last century, as well as the new trends in brewing, are discussed in detail. Hop research is an ever growing field of central importance to the brewing industry, even in areas that are not traditionally associated with hops and brewing. This article attempts to give a general overview of the different areas of hop research while assessing the latest advances in hop science and their impact on brewing.

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Section: Hop Chemistrymentioning

confidence: 99%

“…Jackson and Walker were not able to identify any pure compounds in the δ ‐resin. However, from the recorded observations on the similarity in chemical behaviour of the fractions, it was possible for them to conclude that some basic type of structure predominates amongst the δ ‐resin components .…”

Section: Hop Chemistrymentioning

confidence: 99%

Humulus lupulus- a story that begs to be told. A review

Schönberger²,

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Walker, Zakomorny, and Blakebrough (403) observed that a portion of the hard resin was water soluble and bitter and had bacteriostatic properties. They called it the resin, and it was observed that this fraction accumulated during the storage of hops (1), but despite an extensive fractionation no pure components could be characterized (223,341). Hulupinic acid (see later) is a hard-resin component with appreciable solubility in water and may therefore be classed as a resin (72).…”

Section: Resinmentioning

confidence: 99%