The effects of rheological properties of wall materials on morphology and particle size distribution of microcapsule

Yanli Xie, Airong Wang, Qiyu Lu and Ming Hui
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Yanli Xie: School of Food Science and Technology, Henan University of Technology, Zhengzhou, P. R. China
Airong Wang: School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, P. R. China
Qiyu Lu: School of Food Science and Technology, Henan University of Technology, Zhengzhou, P. R. China
Ming Hui: School of Bioengineering, Henan University of Technology, Zhengzhou, P. R. China

Czech Journal of Food Sciences, 2010, vol. 28, issue 5, 433-439

Abstract: The effects of rheological properties of the wall materials on the morphology and particle size distribution of microcapsules prepared by spray-drying were evaluated. Gelatin-sucrose (Gel-Suc), gelatin-peach-gum-sucrose (Gel-PG-Suc), and HI-CAP 100 were used as wall materials with vitamin A as a model core material. Scanning electron microscopy (SEM) showed that microcapsules produced with Gel-Suc exhibited cracks while Gel-PG-Suc produced a smooth surface with few pores, and HI-CAP100 a rounded surface containing characteristic concavities. The volume average diameter (D4,3) showed significant variations from 73.9 ± 1.02 µm and 68.7 ± 0.85 µm to 29.9 ± 0.94 µm (P < 0.05). Rheometry indicated that the wall paste viscosity was inversely proportional to the shear rate. Viscosity ranking was Gel-Suc > Gel-PG-Suc > HI-CAP 100. Gel-Suc showed the highest elastic modulus (G') and viscous modulus (G'' values), followed by Gel-PG-Suc and HI-CAP 100. Gel-Suc was associated with moderate quantities of broken microcapsules while HI-CAP 100 generated numerous microcapsules with characteristic dents generated during spray-drying.

Keywords: microcapsule; wall materials; rheological properties; morphology; particle size; spray-drying (search for similar items in EconPapers)
Date: 2010
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:28:y:2010:i:5:id:49-2009-cjfs

DOI: 10.17221/49/2009-CJFS

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