Soft resins uncharacterized

Total resins. The part of the hop constituents which is characterized by solubility both in cold methanol and diethyl ether (mainly hard resins, uncharacterized soft resins, a-acids, and -acids). 

Total soft resins. The fraction of the total resins which is characterized by solubility in hexane (mainly a-acids, p-acids, and uncharacterized soft resins). Hard resins. The fraction of the total resins which is characterized by insolubility in hexane. It is calculated as the difference between total resins and total soft resins. 

Uncharacterized soft resins. That portion of the total soft resins which has not been characterized as specific compounds. 

In the fresh hop the a- and p-acids make up the bulk of the soft resin the deoxyhumulones contribute to the uncharacterized soft resins. Only the a-acids have brewing value. The major constituent of the hard resin is... 

Some of these oxidation products are soluble in hexane and are thus uncharacterized soft resins. Others are more polar, insoluble in hexane but soluble in ether these are hard resins. However, even for those oxidation products which have been characterized (see later) the relative solubilities are often not reported, so it is impossible to classify them according to the above scheme. 

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See also in sourсe #XX -- [ , ]

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