| Drying of Micro-Encapsulated Lactic Acid Bacteria—Effects of Trehalose and Immobilization on Cell Survival and Release Properties |
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| 作者单位： | College of Marine Life Sciences, Ocean University of China, Qingdao 266003, P. R. China
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| 基金项目： | 国家自然科学基金，the ISTCP |
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| 摘 要： | Lactic acid bacteria (LAB) were encapsulated with alginate, gelatin and trehalose additives by the extrusion method and dried at 4 ℃. The microcapsules were generally spherical and had a wrinkled surface with a size of 1.7 mm ± 0.2 mm. Trehalose as a carbohydrate source in the culture medium could reduce acid production and performed no function in the positive proliferation of LAB. Using trehalose as a carbohydrate source and protective medium simultaneously had a benefit in the protection of LAB cells dur...
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| 关 键 词： | 藻酸盐 明胶 微胶囊 海藻糖 生存 耐性 |
Drying of micro-encapsulated lactic acid bacteria — Effects of trehalose and immobilization on cell survival and release properties |
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| Authors: | Xiaoyan Li Xiguang Chen |
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| Institution: | College of Marine Life Sciences, Ocean University of China, Qingdao 266003, P. R. China |
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| Abstract: | Lactic acid bacteria (LAB) were encapsulated with alginate, gelatin and trehalose additives by the extrusion method and dried at 4℃. The microcapsules were generally spherical and had a wrinkled surface with a size of 1.7mm±0.2mm. Trehalose as a carbohydrate source in the culture medium could reduce acid production and performed no function in the positive proliferation of LAB. Using trehalose as a carbohydrate source and protective medium simultaneously had a benefit in the protection of LAB cells during the storage at 4℃. The density of hve LAB cells could be 10- CFU g-1 after 8 weeks of storage. Cells of LAB could be con-tinuously released from the capsules from the acidic (pH 1.2) to neutral conditions (plt 6.8). The release amounts and proliferation speeds of LAB cells in neutral medium were much larger and faster than those m acidic conditions. Additionally, immobilization of LAB could improve the survival of cells when they, were exposed to acidic medium (pH 1.2) with a survival rate of 76 %. |
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| Keywords: | alginate gelatin microcapsule trehalose survival release tolerance |
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