Anti-hygroscopic effect of dextrans in herbal formulations

International Journal of Pharmaceutics
Henry H Y TongAlbert H L Chow

Abstract

Equilibrium moisture sorptions of two dried aqueous herbal extracts and their mixtures with dextrans of various molecular weights were investigated as a function of relative humidity at ambient temperature, and the data were analyzed by both the Guggenheim-Anderson-deBoer (GAB) and Brunauer-Emmett-Teller (BET) equations. Glass transition temperatures (T(g)) of the samples were measured by differential scanning calorimetry, and their dependence on the moisture contents of the extracts was analyzed by the linear, Fox and expanded Gordon-Taylor mathematical models. All dextran-extract mixtures exhibited single T(g) values, indicating that they existed as single homogeneous phases. The BET equation was found adequate for description of the moisture sorption isotherms for all samples. The dextrans appeared to reduce the hygroscopicity of the herbal extracts solely by a dilution effect. The observed increase in T(g) and accompanying decrease in tackiness of the herbal extracts in the presence of dextrans may be explained by the ability of dextrans to restrict the molecular mobility of simple sugars and to counteract the plasticizing effect of water in the extracts. The expanded Gordon-Taylor equation has proved useful in predicting t...Continue Reading

References

Aug 3, 2006·Journal of Agricultural and Food Chemistry·Yeting LiuWeibiao Zhou
Sep 29, 2006·The Journal of Physical Chemistry. B·Alexandra SimperlerGerhard Zifferer

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Citations

Dec 25, 2012·Scientia pharmaceutica·Loreana GalloVerónica Bucalá
Aug 18, 2006·Journal of Forensic and Legal Medicine·Sachidananda MohantyManju Patnaik
Apr 11, 2018·Food Science and Technology International = Ciencia Y Tecnología De Los Alimentos Internacional·Darvin E Jimenez-SánchezJuan A Ragazzo-Sánchez
Aug 3, 2018·Current Drug Discovery Technologies·Loreana Gallo, Veronica Bucala

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