Effect of Molecular Weight and Concentration of Polyethylene Glycol on Physicochemical Properties and Stability of Shellac Film
- 23 November 2010
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of Agricultural and Food Chemistry
- Vol. 58 (24), 12934-12940
- https://doi.org/10.1021/jf1031026
Abstract
The effects of molecular weight and concentration of plasticizer on physicochemical properties and stability of shellac films were investigated. Type of plasticizer was previously reported to have some effects on the stability of shellac films, and polyethylene glycol (PEG) was the plasticizer of choice for plasticizing shellac films. In this study, different molecular weights of PEG (200, 400 and 4000) were chosen at a concentration of 10% w/w of shellac films. Shellac in alcohol was prepared in a free film. The stability of shellac film was then performed at 75% RH, 40 °C for 3 months. The comparison was made between the film with and without plasticizer. Shellac films were then determined for acid value, insoluble solid, mechanical properties and water vapor permeability coefficient. It was reported that different molecular weights of PEG had some influence on physicochemical properties of the shellac films. Among different molecular weights of PEG, PEG 400 showed a suitable molecular weight that could protect the shellac chain at the carboxylic and hydroxyl groups. Therefore, the molecular weight of plasticizer played a crucial role for the protective ability at active sites. Further study was performed to investigate the effect of concentrations of PEG 400 on the stability. The results demonstrated that PEG 400 at a concentration of 10% (w/w) could prevent the polymerization process for only 4 months and a significant change of all parameters was then reported. However, a higher concentration, 20% (w/w) of PEG 400, could prolong the stability of shellac for 6 months of study. Therefore, the drawback of shellac as a natural polymer in pharmaceutical and food industries could be tackled by the appropriate size and concentration of plasticizer.Keywords
This publication has 20 references indexed in Scilit:
- Effects of various plasticizers on mechanical and water vapor barrier properties of gelatin filmsFood Hydrocolloids, 2009
- Mechanical and water vapor barrier properties of tapioca starch/decolorized hsian-tsao leaf gum films in the presence of plasticizerFood Hydrocolloids, 2008
- Moisture barrier, wetting and mechanical properties of shellac/agar or shellac/cassava starch bilayer bio-membrane for food applicationsJournal of Membrane Science, 2008
- Formation of shellac succinate having improved enteric film properties through dry media reactionEuropean Journal of Pharmaceutics and Biopharmaceutics, 2008
- The Influence of Different Plasticizers and Polymers on the Mechanical and Thermal Properties, Porosity and Drug Permeability of Free Shellac FilmsDrug Development and Industrial Pharmacy, 2006
- Pharmaceutical Applications of Shellac: Moisture-Protective and Taste-Masking Coatings and Extended-Release Matrix TabletsDrug Development and Industrial Pharmacy, 2003
- Selected Functional Properties of Fish Myofibrillar Protein-Based Films As Affected by Hydrophilic PlasticizersJournal of Agricultural and Food Chemistry, 1997
- Permeability to hydrogen ions of an enteric coating polymer and interaction of film formulation factorsInternational Journal of Pharmaceutics, 1996
- Edible composite films of wheat gluten and lipids: water vapour permeability and other physical propertiesInternational Journal of Food Science & Technology, 1994
- Dry and wet strengths of polymeric films prepared from an aqueous colloidal polymer dispersion, Eudragit RS30DInternational Journal of Pharmaceutics, 1993