Document Detail


Formation of odorants in Maillard model systems based on l-proline as affected by pH.
MedLine Citation:
PMID:  12769539     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Formation of the odorants acetic acid, 4-hydroxy-2,5-dimethyl-3-(2H)-furanone (HDMF), 6-acetyl-1,2,3,4-tetrahydropyridine (ATHP), and 2-acetyl-1-pyrroline (AP) was monitored by isotope dilution assays at pH 6, 7, and 8 in Maillard model reactions containing glucose and proline (Glc/Pro) or the corresponding Amadori compound fructosyl-proline (Fru-Pro). In general, higher yields were obtained at pH 7 and 8. Acetic acid was the major odorant with up to 40 mg/mmol precursor followed by HDMF (up to 0.25 mg/mmol), the formation of which was favored in the Fru-Pro reaction systems. On the contrary, ATHP (up to 50 microg/mmol) and AP (up to 5 microg/mmol) were more abundant in Glc/Pro. However, the sensory relevance of the two N-heterocycles was more pronounced on the basis of odor activity values, confirming their contribution to the overall roasty note of the reaction samples. It was also found that formation and decomposition of Fru-Pro were faster at pH 7 as compared to pH 6, explaining in part the preferred formation of the four odorants studied under neutral and slightly alkaline conditions. After 4 h of reaction at pH 7 in the presence of proline, about one-fourth of the glucose was consumed leading to acetic acid with a transformation yield of almost 40 mol %.
Authors:
Imre Blank; Stéphanie Devaud; Walter Matthey-Doret; Fabien Robert
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  51     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2003 Jun 
Date Detail:
Created Date:  2003-05-28     Completed Date:  2003-08-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3643-50     Citation Subset:  IM    
Affiliation:
Nestec Ltd., Nestlé Research Center, P.O. Box 44, 1000 Lausanne 26, Switzerland. imre.blank@rdls.nestle.com
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MeSH Terms
Descriptor/Qualifier:
Fructose / chemistry
Glucose / chemistry
Hydrogen-Ion Concentration
Kinetics
Maillard Reaction*
Odors / analysis*
Oxidation-Reduction
Proline / chemistry*
Volatilization
Chemical
Reg. No./Substance:
147-85-3/Proline; 30237-26-4/Fructose; 50-99-7/Glucose

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


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