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EUROPEAN BREWERY CONVENTION: ANALYSIS COMMITTEE SUB‐COMMITTEE ON ANALYSIS OF HOPS AND EXTRACTS METHODS OF ANALYSIS OF HOP EXTRACTS
Publication year - 1970
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.2050-0416.1970.tb03317.x
Subject(s) - qualitative analysis , hop (telecommunications) , convention , library science , computer science , information retrieval , operations research , chemistry , law , mathematics , sociology , political science , telecommunications , qualitative research , social science
For the conductometric analysis of hop extracts the method described by Bishop, 6 is satisfactory provided the extract is composed entirely of resins; extracts which contain additional water‐soluble material should be analysed by an abbreviated Wöllmer technique. For isomerized extracts a qualitative examination should first be made, either by paper‐strip chromatography or by thin‐layer chromatography. A rapid counter‐current distribution procedure is suitable for the analysis of isomerized extracts: the modified Rigby & Bethune method 22 is appropriate only with extracts which are known to be free from α and β acids.