首页> 外文期刊>International Journal of Biological Macromolecules: Structure, Function and Interactions >Layer (whey protein isolate) -by-layer (xanthan gum) microencapsulation enhances survivability of L. bulgaricus and L. paracasei under simulated gastrointestinal juice and thermal conditions
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Layer (whey protein isolate) -by-layer (xanthan gum) microencapsulation enhances survivability of L. bulgaricus and L. paracasei under simulated gastrointestinal juice and thermal conditions

机译:层(乳清蛋白分离液)-By-层(黄原胶)微胶囊化可提高模拟胃肠汁和热条件下L.保加利菌和L. parac键病的活力

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摘要

In the study, Lactobacillus delbrueckii subsp. bulgaricus (L. bulgaricus) and Lactobacillus paracasei subsp. paracasei paracasei) were isolated from food products and identified. The probiotics were co-encapsulated by emulsification technique with transglutaminase-induced gelation of whey protein isolate (WPI). A double layer was formed by xanthan gum (XG). The survival of both free and microencapsulated cells in each step was enumerated. The results showed that high entrapment yield (8636 +/- 1.07%) was achieved, WPI-XG provided significant protection for cells in simulated gastric juice and bile tolerance tests compared with free cells. Besides, the survivability under thermal condition also strengthened. During freeze-drying process, the survival was improved and naked cells cannot be seen on microcapsules surface when trehalose was added into WPI solution as a lyoprotectant Additionally, the structure changes of WPI/XG in the encapsulation process were investigated by Fourier transform infrared spectrophotometer (FT-IR) and the thermal properties were studied by differential scanning calorimetry (DSC). (C) 2020 Elsevier B.V. All rights reserved.
机译:在该研究中,乳酸杆菌Delbrueckii子公司。保加利亚宫(L.upargaricus)和乳杆菌帕拉沙萨氏菌胚子。 ParacaCyi paracasei)与食品分离并鉴定。通过乳化技术与乳胶氨基氨基酶诱导的乳清蛋白分离物(WPI)凝胶化共封装益生菌。双层由黄原胶(XG)形成。列举每个步骤中的游离和微胶囊细胞的存活率。结果表明,达到了高血浆产量(8636 +/- 1.07%),WPI-XG为与自由细胞相比,对模拟胃液和胆耐受试验中的细胞提供了显着的保护。此外,热条件下的生存能力也强化。在冻干过程中,当另外,将海藻糖加入到WPI溶液中的微胶囊表面上,在作为催乳素的WPI溶液中的微胶囊表面上,通过傅里叶变换红外分光光度计研究了在微胶囊表面上的微胶囊表面上的生存,并通过傅里叶变换红外分光光度计研究了WPI / XG的结构变化(通过差示扫描量热法(DSC)研究了FT-IR)和热性质。 (c)2020 Elsevier B.v.保留所有权利。

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