Document Detail

Comparison of the effects of concentration, pH and anion species on astringency and sourness of organic acids.
MedLine Citation:
PMID:  9669047     Owner:  NLM     Status:  MEDLINE    
The separate effects of concentration, pH and anion species on intensity of sourness and astringency of organic acids were evaluated. Judges rated sourness and astringency intensity of lactic, malic, tartaric and citric acid solutions at three levels of constant pH varying in normality and at three levels of constant concentration varying in pH. To assess the comparative sourness and astringency of the organic acid anions of study, binary acid solutions matched in pH and titratable acidity were also rated. As pH was decreased in equinormal solutions, both sourness and astringency increased significantly (P < 0.001). By contrast, as the normality of the equi-pH solutions was increased, only sourness demonstrated significant increases (P < 0.001) while astringency remained constant or decreased slightly. At the lowest normality tested, all solutions were more astringent than sour (P < 0.05). Although lactic acid was found to be significantly more sour than citric acid (P < 0.05), no other sourness or astringency differences among the organic acid anions were noted. This study demonstrates for the first time that astringency elicited by acids is a function of pH and not concentration or anion species, and confirms that sourness is independently influenced by concentration, pH and anion species of the acid.
R A Sowalsky; A C Noble
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chemical senses     Volume:  23     ISSN:  0379-864X     ISO Abbreviation:  Chem. Senses     Publication Date:  1998 Jun 
Date Detail:
Created Date:  1998-09-17     Completed Date:  1998-09-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8217190     Medline TA:  Chem Senses     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  343-9     Citation Subset:  IM    
Robert Mondavi Winery, Woodbridge, CA 95258, USA.
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MeSH Terms
Carboxylic Acids / chemistry*
Citric Acid / chemistry
Hydrogen-Ion Concentration
Lactic Acid / chemistry
Malates / chemistry
Osmolar Concentration
Salivation / physiology
Sex Characteristics
Tartrates / chemistry
Reg. No./Substance:
0/Anions; 0/Carboxylic Acids; 0/Lactates; 0/Malates; 0/Tartrates; 50-21-5/Lactic Acid; 526-83-0/tartaric acid; 6915-15-7/malic acid; 77-92-9/Citric Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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