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標題: The+Formability+and+Quality+of+Ca-alginate+Hydrogel+Beads+Formed+by+Different+Calcium+Salts
作者: Huang, Yu-Ling
Tsai, Feng-Fu
Chang, Hsiu-Ming
Wang, Wen-Liang
Chiang, Po-Yuan
關鍵字: Calcium-alginate;海藻酸鈣;Hardness;Swelling capacity;Particle size;Thermal property;硬度;膨潤力;粒徑;熱性質
出版社: 臺中巿: 國立中興大學農學院
Project: 農林學報, Volume 61, Issue 2, Page(s) 185-202.
Microencapsulation is a technique used to form micro beads by granulation and coating with film-forming materials. The cross-linking and hydrogel interaction of alginate and calcium salts play an important role in the preparation of calcium-alginate beads. In this study, we studied the formability and quality index of calciumalginate beads made by sodium alginate (3 %) and different calcium salts (calcium chloride, calcium lactate and calcium acetate with 0.01, 0.05, 0.1, 0.25 M) with different curing time (5, 30 and 60 min). The result showed that the sodium alginate concentration, calcium salts concentration and curing time were important factors of hydrogel bead formability. Increasing the concentration of calcium salts and curing time enhanced the cross-linkage between alginate and calcium. It resulted in enhancing the egg-box structure. It also led to decreasing particle size, raising hardness, and decreasing swelling capacity and moiture content. The appearances of wet hydrogel beads made by different calcium salts were all spherical. However, dry hydrogel beads were easily deformed when the concentration of calcium salts was less than 0.1 M and curing time less than 30 min. The thermo-analysis showed that the onset temperature (To), peak temperature (Tp) and enthalpy (ΔH) were the highest when treated by 0.25 M of calcium salts at 60 min curing time. In the SEM micrographs, there was more shrinking on the surface of samples formed by 0.25 M of calcium salts at 60 min curing time. Finally, the calcium-alginate hydrogel beads which were treated by curing agents, calcium chloride or calcium acetate, have better formability, stronger structure and higher hardness.

Appears in Collections:第61卷 第02期

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