This method describes how to determine the capacity for water imbibition (moisture uptake) in barley.
Barley intended for the production of malt is evaluated on the basis of its capacity for water imbibition.
Barley is steeped according to a defined scheme, and the absorption of the steeping liquor by the kernels at defined times is determined by calculating the moisture content. The moisture content after 72 h steeping time is used to assess the absorption of steeping liquor or the capacity for water imbibition in barley.
Potassium permanganate oxidizes many organic and certain inorganic substances more or less completely in acidic, neutral or alkaline solutions. The volume of potassium permanganate required in the analysis is determined potentiometrically. Since oxidation depends on the type of solution, on its temperature and on the reaction time, the procedure described below must be followed precisely.
In acidic solutions, permanganate ions are typically reduced to manganese(II) ions:
MnO4- + 5 e- + 8 H3O+ → Mn2+ + 12 H2O
In alkaline solutions, the reduction results in tetravalent manganese only:
MnO4- + 3 e- + 4 H3O+ → MnO2 + 6 H2O
Since in both cases the titration takes place in an acidic solution, this is irrelevant for the calculation. By adding oxalic acid, both the excess permanganate ions as well as the tetravalent manganese are reduced to manganese(II) ions:
2 MnO4- + 5 C2O42- + 16 H3O+ → 2 Mn2+ + 24 H2O + 10 CO2
MnO2 + C2O42- + 4 H3O+ → Mn2+ + 6 H2O + 2 CO2
This method describes the rapid method for determining the germinative capacity of an individual lot of barley.
Barley intended for the production of malt is evaluated on the basis of its germinative capacity.
In living kernels, in the presence of oxidoreductases and their corresponding coenzymes, the colorless compound triphenyltetrazolium chloride is reduced to formazan, which is red in color [1].
This method describes how to determine whether malt is (once again) capable of germination.
Malt intended for use in beer brewing or elsewhere in the food industry.
In living kernels, in the presence of oxidoreductases and their corresponding coenzymes, the colorless compound triphenyl-tetrazolium chloride is reduced to formazan, which is red in color [1].
or
Under the influence of oxygen, barley kernels emerge from dormancy. In this way, germination can be induced at any given time.
Barley intended for the production of malt; therefore, the barley must be evaluated on the basis of its germinative capacity.
Under the influence of oxygen, which is liberated through the degradation of hydrogen peroxide, the barley kernels emerge from dormancy. In this way, germination can be induced at any given time.
This method describes the conditions under which sensory analysis should be carried out.
beer, beer-based beverages, non-alcoholic beverages, mineral water
One of the basic prerequisites for properly conducting sensory analysis is selecting suitable candidates to serve as members of the tasting panel.