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Investigation of various shellac grades: additional analysis for identity.
MedLine Citation:
PMID:  19514984     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Background: A number of different grades of shellac are commercially available and most of them are known only as generic shellac and are not further differentiated. The investigated grades of shellac in this study are based on different insect strains, host trees, refining methods, and products from different suppliers. Method: The Gardner/Iodine color values of alcoholic and aqueous solutions of the various shellac grades were measured. Glass transition temperatures and pK(a)-values were determined. To assess chemical differences in the tested shellac grades, MALDI-TOF analysis was performed. Results: Differences were found in color, T(G), and pK(a)-values and in the mass spectra by MALDI-TOF analysis. Conclusions: The results indicate that these methods can facilitate the determination of identity and are quality control parameters for shellac.
Authors:
Karl Buch; Manfred Penning; Eva Wächtersbach; Michael Maskos; Peter Langguth
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Drug development and industrial pharmacy     Volume:  35     ISSN:  1520-5762     ISO Abbreviation:  Drug Dev Ind Pharm     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-06-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7802620     Medline TA:  Drug Dev Ind Pharm     Country:  England    
Other Details:
Languages:  eng     Pagination:  694-703     Citation Subset:  IM    
Affiliation:
Department of Pharmaceutical Technology and Biopharmaceutics, Johannes Gutenberg-University, Mainz, Germany.
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