谷子相关益生菌的功能和分子特征。

Functional and molecular characterization of millet associated probiotic bacteria.

机构信息

Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, 641 003, India.

Department of Food Process Engineering, AEC and RI, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, 641 003, India.

出版信息

BMC Microbiol. 2024 Nov 20;24(1):485. doi: 10.1186/s12866-024-03606-9.

Abstract

The lactic acid bacteria are one of the sustainable ways of food production. As the native lactic acid bacteria (LAB) easily manipulate the substrate, helps in production of health essential probiotics with enhancing the bioavailability of the substrate. Here also, in present study, the native LAB isolates isolated from the millets and characterize them for the functional analysis for the human health association. In the present study, fermented millet-associated lactic acid bacteria were screened and characterized for their probiotic potential, safety evaluation and antimicrobial activity. A total of 33 isolates were purified as lactic acid bacteria based on colony shape and biochemical assays. However, only 13 isolates were found to be catalase-negative. Among the 13 isolates, 5 isolates exhibited optimum growth at 6.5% and 9.5% of salt concentrations, pH of 4.5 to 8.5 and 17 °C to 40 °C of the temperature. The probiotic properties of the five isolates exhibited that the survival rates in acid and bile salt concentration ranged from 56.2 to 73.7% and 55.3 to 70.3%, respectively. Similarly, the surface hydrophobicity of the isolates was 41-75%. Antibiotic assay revealed that all five isolates were resistant to Amoxicillin, Cloxacillin, and Penicillin-V. Interestingly, all the isolates except ME26 displayed susceptibility towards Penicillin (2 units) and Tetracycline (10 µg). Further, the four isolates (ME25, ME26, ME9, and ME2) had more antifungal activity against Aspergillus flavus. However, only three, except ME1 and ME2, showed maximum antibacterial activity and produced more antimicrobial compounds compared to reference strain L. plantarum Pb3. The potential probiotic isolates were identified as Weisella cibaria ME9, Weisella cibaria ME26, and Weisella confusa ME25.

摘要

乳酸菌是可持续的食品生产方式之一。由于本土乳酸菌(LAB)容易对基质进行操作,有助于生产对健康有益的益生菌,同时提高基质的生物利用度。在本研究中,我们从小米中分离出本土 LAB 并对其进行功能分析,以研究其与人类健康的关联。在本研究中,我们筛选和表征了发酵小米相关的乳酸菌,以评估其益生菌潜力、安全性和抗菌活性。根据菌落形态和生化试验,共分离出 33 株乳酸杆菌。然而,只有 13 株被鉴定为过氧化氢酶阴性。在这 13 株菌中,有 5 株在 6.5%和 9.5%盐浓度、pH 值 4.5 到 8.5 和 17°C 到 40°C 的温度下表现出最佳生长。这 5 株菌的益生菌特性表明,它们在酸和胆汁盐浓度下的存活率范围分别为 56.2%到 73.7%和 55.3%到 70.3%。同样,这些菌株的表面疏水性为 41%-75%。抗生素检测结果显示,这 5 株菌均对阿莫西林、氯唑西林和青霉素-V 具有抗性。有趣的是,除 ME26 外,所有菌株均对青霉素(2 单位)和四环素(10μg)敏感。此外,除 ME1 和 ME2 外,其余 4 株(ME25、ME26、ME9 和 ME2)对黄曲霉具有更强的抗真菌活性。然而,与参考菌株 L. plantarum Pb3 相比,只有 3 株(除 ME1 和 ME2 外)表现出最大的抗菌活性,且产生了更多的抗菌化合物。这 3 株潜在的益生菌菌株被鉴定为魏斯氏菌 ME9、魏斯氏菌 ME26 和魏斯氏菌 ME25。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/344d/11577924/5191970babec/12866_2024_3606_Fig1_HTML.jpg

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