十字花素在模型封装系统中提高益生菌罗伊氏乳酸杆菌的抗逆性和模拟胃肠道存活

IF 4.6 Q1 CHEMISTRY, APPLIED
Ali Akbari , Michael G. Gänzle , Jianping Wu
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引用次数: 6

摘要

封装是一种可行的策略,可以提高益生菌在加工、储存和消费过程中的稳定性和存活率。十字花素是一种主要的油菜蛋白,具有高变性温度和抗胃降解性,具有封装益生菌和保护益生菌免受加工和胃肠道恶劣条件影响的潜力。制备了十字花素/海藻酸盐胶囊包埋益生菌,并用共聚焦和扫描电子显微镜(SEM)对其进行了表征。研究了细菌在储存、加工和胃肠道运输过程中的生存能力。将路氏乳杆菌TMW 1.656包封在使用挤出法制备的球形十字花素/海藻酸盐胶囊(2.2±0.1mm)中。胶囊的SEM图像显示,细菌被截留在十字花素和藻酸盐络合形成的多孔结构中。共聚焦显微镜图像证实十字花素和海藻酸盐均匀分布在整个胶囊中。在十字花素和藻酸盐存在的情况下,细菌的保质期在4°C下增加了8周,而未包封(游离)细菌在储存2周后失去了生存能力。与未封装的细菌相比,暴露在65°C和70°C下的封装细菌的耐热性分别提高了~4和2个对数周期。封装还保护路氏乳杆菌免受胃低pH值和酶的影响;与未包封的细菌相比,活力高出3个对数。胶囊在模拟肠液中降解,导致封装的细菌释放,而壁材料增加了释放的细菌对胆盐的抵抗力。在十字花素/海藻酸盐混合物存在下,未包封的细菌与包封在胶囊中的细菌的生存能力之间的比较表明,胶囊的形成为恶劣条件提供了物理屏障,并在保护细菌方面发挥了关键作用。本研究表明,十字花素/海藻酸盐胶囊能够提高路氏乳杆菌的稳定性和保质期。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Cruciferin improves stress resistance and simulated gastrointestinal survival of probiotic Limosilactobacillus reuteri in the model encapsulation system

Cruciferin improves stress resistance and simulated gastrointestinal survival of probiotic Limosilactobacillus reuteri in the model encapsulation system

Encapsulation is a viable strategy to improve the stability and survival of probiotics during processing, storage, and consumption. Cruciferin, a major canola protein with high denaturation temperature and resistance to gastric degradation, has potential for encapsulation and protection of probiotics against harsh conditions in processing and gastrointestinal tract. Cruciferin/alginate capsules were fabricated to encapsulate probiotics, and were characterized using confocal and scanning electron microscopy (SEM). The bacterial viability was studied during storage, processing, and gastro-intestinal transit. Limosilactobacillus reuteri TMW 1.656 was encapsulated in spherical cruciferin/alginate capsules (2.2 ± 0.1 mm) prepared using an extrusion method. SEM images of the capsules showed that the bacteria were entrapped within the porous structure which was formed by the complexation of cruciferin and alginate. The confocal microscopy images confirmed that cruciferin and alginate were homogeneously distributed throughout the capsules. The shelf life of the bacteria in the presence of cruciferin and alginate increased up to 8 weeks at 4 °C, while unencapsulated (free) bacteria lost their viability after 2 weeks storage. The heat resistance of encapsulated bacteria exposed to 65 °C and 70 °C was improved by up to ∼ 4 and 2 log cycles, respectively, compared to unencapsulated bacteria. Encapsulation also protected L. reuteri against gastric low pH and enzymes; the viability was 3 logs higher when compared to unencapsulated bacteria. The capsules were degraded in simulated intestinal fluid, leading to the release of the encapsulated bacteria, whereas the wall materials increased the resistance of released bacteria to bile salts. Comparison between the viability of unencapsulated bacteria in presence of cruciferin/alginate mixtures and bacteria encapsulated in the capsules revealed that capsule formation provided physical barriers to the harsh conditions and played a key role in the protection of bacteria. This study showed that cruciferin/alginate capsules are capable to improve stability and shelf life of Limosilactobacillus reuteri.

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