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Six kilos of lupuline, which included a large proportion of sand, furnished 400 grammes of crude hop-bitter acid. The first experiments in crystallization with petroleum ether gave poor results; it is difficult to produce the acid pure in large quantities by this process, as a small quantity of the above substance obstinately clings to it, and it readily assumes a non-crystallizable form.
The young plant is, to a great extent, composed of starch; as the plant grows older, a substance is produced which is called diastase. Through the influence of this diastase the starch is converted into a peculiar non-crystallizable substance called dextrine, and as the plant matures, this dextrine is transformed into crystallizable sugar.
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