This method describes how to determine whether kernels are cracked as part of the visual and manual inspection of a lot of barley.
Barley intended for the production of malt is to be evaluated on the basis of the characteristics described below.
Visual assessment
This method describes how to determine the percentage of cracked kernels as part of the visual and manual inspection of a lot of barley
Barley intended for the production of malt is to be evaluated on the basis of the characteristics described below.
Visual assessment
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.
The method is suitable for the determination of water vapor volatile aroma compounds in beer.
Volatile aroma compounds are driven out of the sample through steam distillation. The ethanolic distillate is saturated with NaCl. Potassium hydrogen sulfite is added to separate carbonyl groups that might interfere with the analysis. The extraction of the aroma compounds is performed by shaking out with dichloromethane and the phases separated by centrifuging.