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LUPULIN: ANALYSIS AND USAGE
Author(s) -
Askew H. O.
Publication year - 1965
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/j.2050-0416.1965.tb02037.x
Subject(s) - computer science
A high‐grade lupulin from Californian hops was made up of 44·7% α acids, 33·6% β acids, soft and hard resins 5·5%, crude protein 4·9%, crude ash 1·5%, reducing sugars 0·6%, and structural material, etc., 9·6%. Tannins (3·9%) and a trace of anthocyanidins were present. Crushing of the lupulin is necessary for complete extraction of the acids; in petroleum‐ether extracts the sum of α + β acids approximates closely to the total solids in the solution. Spectrophotometric examination of iso ‐octane extracts from distilled water or wort in which lupulin has been boiled can give misleading information. Data obtained from such extracts taken into alkaline methanol are more reliable and informative. At about pH 6·5 efficiency of conversion of α acids into iso ‐compounds was 95% in distilled water; β acids were not appreciably changed. On boiling lupulin in wort or water some tannins go into solution.