This method describes how to determine the thousand kernel weight of barley.
Barley intended for the production of malt is evaluated on the basis of the thousand kernel weight.
This test is based upon determining the number of barley kernels in a subsample of a defined weight, i.e., the calculation of the weight of 1000 kernels of barley.
After corn starch is converted through the addition of purified, heat-stable α-amylase during a 15 min boiling process and subsequent Congress mash procedure, the extract content is determined.
This method describes how to determine the thousand kernel weight of malt.
Barley malt intended for use in beer brewing or elsewhere in the food industry.
The thousand kernel weight is more meaningful for evaluating malt quality than the hectoliter weight. A relationship exists between the thousand kernel weight and both the sieving test and the extract yield of malt, since the percentage of extract contained in malt increases with increasing thousand kernel weight, given that the protein content remains constant. The thousand kernel weight rises with increasing moisture content of the malt; therefore, it must be calculated in reference to the dry substance of the malt to produce an objective measurement [1].
Hops and hop products intended for use in beer brewing or elsewhere in the food industry
After milling, hops and hop powder products are extracted using a diethyl ether/methanol mixture and a hydrochloric acid solution. The α-acids and β-acids dissolved in the ether phase are separated using reversed phase high-pressure liquid chromatography (RP-HPLC) and measured spectrophotometrically at a wavelength of 314 nm.
Hop extracts are dissolved in methanol. The α-acids and β-acids dissolved in the methanol are separated using reversed phase high pressure liquid chromatography (RP-HPLC) and measured spectrophotometrically at a wavelength of 314 nm.
Whole hops intended for use in beer brewing or elsewhere in the food industry
This method describes how to determine the α-acids and β-acids in hop extract using high-pressure liquid chromatography.
Hop extract intended for use in beer brewing or elsewhere in the food industry