Hop extract intended for use in beer brewing or elsewhere in the food industry
This method describes how to determine iso-α-acids, α-acids and β-acids in isomerized pellets by means of reverse phase high pressure liquid chromatography (RP-HPLC).
Isomerized pellets intended for use in beer brewing or elsewhere in the food industry
The bitter substances in isomerized hop pellets contain a substantial amount of iso-α-acids; however, in addition to these, non-isomerized α-acids and β-acids are also present. In order to determine their content, a specific method is required.
After milling, the substances in question are extracted from the isomerized pellets using a diethyl ether/methanol mixture and a hydrochloric acid solution. The iso-α-acids, α-acids and β-acids dissolved in the ether phase are separated using reversed-phase high-performance liquid chromatography (RP-HPLC) and an elution gradient. They are then measured spectrophotometrically at wavelengths of 270 nm (iso-α-acids) and 314 nm (α-acids and β-acids).
The method describes the appropriate procedure for sample collection of adjuncts, barley and malt.
Material, which is intended for processing in a food production facility, must be sampled prior to or at the time of delivery.
This method describes how to evaluate the sensory properties of filter aids and stabilization agents.
Filter aids and stabilization agents which are used in the brewing and food production industries
This test provides information regarding any odors transferred by filter aids to wort and beer. A minimum of three samples should be collected from each lot of the product delivered.
This method describes how to test the sensory impact of filter aids and stabilizing agents under normal operating conditions.
Filter aids and stabilizing agents which are used in the brewing and food production industries
In order to test the influence and effects of filter aids in a routine production situation, it is recommended that a filtration trial be conducted under standard operating conditions.
The odor and flavor of the filtered beer is also tested as part of this trial.
The test should be conducted against a control sample that has not been in contact with the material to be tested.
This method describes how to perform sensory analysis of hop-accentuated beers.
beer
Kaltner (2000) developed a score sheet for assessing beers with a strong hop flavor, which on one hand is based on the DLG quality assessment of beer (refer to S.590.53.700 Einzelprobenprüfung zur Qualitätskontrolle von Bier - DLG-Prüfschema für Bier). The criteria aroma, flavor, fullness, liveliness and bitterness are evaluated using a five-point scale in half-point steps, where 5 denotes a pure attribute and 1 indicates major faults. On the other hand, the quality and distinction of the hop aroma and bitterness are assessed. The aroma and flavor of the hop impression are also distinguished. The evaluation is also based on a five-point scale with an intensity of 5 corresponding to the attribute “perfume-like” and 1 to “not perceptible”. Under “quality of the hop aroma” a score of 5 is considered “pleasant” and 1 “unpleasant”. Additionally, the score sheet provides space for describing the sensory impression of the appeal of a particular hop note. The intensity of the bitterness is also evaluated on a five-point scale, and in this case, 5 denotes a very strong impression, and 1 a very weak one.
The appeal of the bitterness has been plotted on a graph and is expressed using the following terms:
rapidly diminishing (low intensity)
fine, harmonious (moderate intensity and pleasantly lingering)
hard (high intensity and fleeting)
lingering (high intensity and persistently lingering)