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New Highly Stable Dimeric 3-Deoxyanthocyanidin Pigments from Sorghum bicolor Leaf Sheath.
MedLine Citation:
PMID:  22489620     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
  The growing interest in natural alternatives to synthetic petroleum-based dyes for food applications necessitates looking at nontraditional sources of natural colors. Certain sorghum varieties accumulate large amounts of poorly characterized pigments in their nongrain tissue. We used High Performance Liquid Chromatography-Tandem Mass Spectroscopy to characterize sorghum leaf sheath pigments and measured the stability of isolated pigments in the presence of bisulfite at pH 1.0 to 7.0 over a 4-wk period. Two new 3-deoxyanthocyanidin compounds were identified: apigeninidin-flavene dimer and apigenin-7-O-methylflavene dimer. The dimeric molecules had near identical UV-Vis absorbance profiles at pH 1.0 to 7.0, with no obvious sign of chalcone or quinoidal base formation even at the neutral pH, indicating unusually strong resistance to hydrophilic attack. The dimeric 3-deoxyanthocyanidins were also highly resistant to nucleophilic attack by SO(2) ; for example, apigeninidin-flavene dimer lost less than 20% of absorbance, compared to apigeninidin monomer, which lost more than 80% of absorbance at λ(max) within 1 h in the presence of SO(2) . The increased molecular complexity of the dimeric 3-deoxyanthocyanidins compared to their monomers may be responsible for their unusual stability in the presence of bisulfite; these compounds present new interesting opportunities for food applications. Practical Application:  Natural dimeric pigments concentrated in sorghum sheath retain their hue properties and stability over a wide pH range and should be explored for potential use in mildly acidic to neutral food applications.
Authors:
Bhimalingeswarappa Geera; Leonnard O Ojwang; Joseph M Awika
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-10
Journal Detail:
Title:  Journal of food science     Volume:  -     ISSN:  1750-3841     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0014052     Medline TA:  J Food Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 Institute of Food Technologists®
Affiliation:
Authors Geera, Ojwang, and Awika are with Soil & Crop Science Dept., Texas A&M Univ., College Station, TX 77843-2474, U.S.A. Author Geera is currently with J.R. Short Milling Co., Kankakee, IL 60901, U.S.A. Direct inquiries to author Awika (E-mail: jawika@ag.tamu.edu).
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