Determination of the proportional composition of grist fractions through sieve analysis
Malt grist, grist from adjuncts
The extract yield in the brewhouse is highly dependent on optimal milling of the malt or other grain. The composition of the brewery grist should therefore be monitored on a regular basis.
The sieve analysis is performed on a sample of brewery grist of a known weight with a shaking device containing a set of sieves (according to DIN ISO 3310-1 specifications or a Pfungstädter plansifter sieving device).
wort, beer
High molecular weight dextrins and starch present in wort or beer are precipitated through the addition of ethanol, centrifuged, dissolved in phosphate buffer, followed by the addition of an iodine solution. Depending on the molecular weight and degree of branching of the erythrodextrins and starch, a red to blue color forms, the intensity of which is measured photometrically.
Determination of neohesperidin dihydrochalcone using HPLC
Suitable for NAB and beer-based beverages
Neohesperidin dihydrochalcone is separated from the matrix by means of reversed phase HPLC and determined through UV detection.
This method describes the visual determination of glassiness in malt.
Malt intended for use in beer brewing or elsewhere in the food industry.
Visual evaluation of longitudinally cut endosperms of malt kernels
This method describes how to determine whether kernels in a lot of barley are cracked by means of the iodine-starch reaction.
Barley intended for the production of malt is to be evaluated on the basis of the characteristics described below.
Detection of cracked kernels is based upon the reaction of iodine with starch. Unprotected starch grains located in the cracks are dyed with iodine, thereby producing a vivid shade of blue, making the cracks easily discernible.
In order to homogenize the samples, isomerized pellets are ground prior to commencing the analysis.
Isomerized pellets intended for use in beer brewing or elsewhere in the food industry
The isomerized pellets are placed in a suitable mill, such as a coffee mill, are then ground to the point that they are sufficiently crushed to be analyzed.