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Investigation of various shellac grades: additional analysis for identity
Karl Buch1, Manfred Penning, Eva Wächtersbach
1Department of Pharmaceutical Technology and Biopharmaceutics, Johannes Gutenberg-University, Mainz, Germany.
Drug Development and Industrial Pharmacy
|June 12, 2009
Summary
This study differentiated various shellac grades using analytical methods. These techniques revealed distinct chemical profiles, enabling quality control and identification of shellac products.
Area of Science:
- Natural Products Chemistry
- Polymer Science
Background:
- Commercially available shellac grades are often undifferentiated.
- Investigated shellac grades varied by insect strain, host tree, refining, and supplier.
Purpose of the Study:
- To differentiate various shellac grades.
- To establish quality control parameters for shellac.
Main Methods:
- Measurement of Gardner/Iodine color values.
- Determination of glass transition temperatures (T(G)) and pK(a)-values.
- MALDI-TOF analysis for chemical profiling.
Main Results:
- Significant differences observed in color, T(G), and pK(a)-values among shellac grades.
- Distinct mass spectra patterns obtained via MALDI-TOF analysis.
- Chemical variations confirmed across different shellac types.
Conclusions:
- Analytical methods can effectively determine shellac identity.
- Established parameters serve as reliable quality control measures for shellac.
- Differentiation of shellac grades is achievable through chemical analysis.
