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Probiotic lactic acid bacteria isolated from traditional cameroonian palm wine and corn beer exhibiting cholesterol lowering activity.

ABSTRACT: High serum cholesterol is a risk factor for cardiovascular disease (CVD), leading to many fatalities. Traditional palm wine (Elaeis guineensis) and corn beer are noted as potential sources of probiotic bacteria with cholesterol lowering activity. In this study, we isolated and characterised lactic acid bacteria (LAB) with probiotic and cholesterol lowering properties from these sources. The isolates were identified using API 50 CHL kit and sequencing of 16 S rRNA gene. A hypercholesterolemia model involving three groups of eighteen diet-induced Wistar albino rats was established, and the serum lipid profile was analysed using biochemical kits. The genotypic identification of two best cholesterol lowering LAB revealed that they were strains of Levilactobacillus brevis and Enterococcus faeccium. Their 16 S r RNA gene sequences were deposited in NCBI genbank with the accension numbers ON454506 and ON908682 respectively. These isolates effectively lowered LDL-c and increased HDL-c in rat sera, which are the main risk factors for CVD. These probiotics are potential candidates for functional foods formulation against hypercholesterolemia.

SUBMITTER: Fossi BT

PROVIDER: S-EPMC9691922 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature

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<i>Probiotic lactic</i> acid bacteria isolated from traditional cameroonian palm wine and corn beer exhibiting cholesterol lowering activity.

Fossi Bertrand Tatsinkou BT Ekabe Dickson Ebwelle DE Toukam Liliane Laure LL Tatsilong Pambou Henri Olivier HO Gagneux-Brunon Amandine A Nkenfou Nguefeu Céline C Bongue Bienvenu B

Heliyon 20221117 11

High serum cholesterol is a risk factor for cardiovascular disease (CVD), leading to many fatalities. Traditional palm wine (<i>Elaeis guineensis</i>) and corn beer are noted as potential sources of probiotic bacteria with cholesterol lowering activity. In this study, we isolated and characterised lactic acid bacteria (LAB) with probiotic and cholesterol lowering properties from these sources. The isolates were identified using API 50 CHL kit and sequencing of 16 S rRNA gene. A hypercholesterole ...[more]

PMID: 36439729

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Project description:The current trend in starter selection is to combine both technological and probiotic properties to standardise and make functional artisanal fermented beverages such as Sha'a whose properties are very variable due to the lack of a known starter. The objective of this work was to study technological and probiotic properties of yeasts isolated from Sha'a sold in Bamenda, Bafoussam, Bonabérie, Dschang, Foumbot, Mbouda and Njombé (Cameroon). The isolated yeasts were studied for their ability to produce CO2 from glucose, to grow in the presence of 8% ethanol, 20% glucose and pH 3, to assimilate maltose and to produce ethanol. Then, the survival of the pre-selected isolates was assessed in simulated gastric (pH 2 and 3) and intestinal juices, followed by self-aggregation, co-aggregation, hydrophobicity, haemolysin, gelatinase, biogenic amine production, antibiotic and antifungal susceptibility, bile salt hydrolase and antiradical activity. The selected isolates were identified by sequencing the 5.8S/28S rRNA gene. From the 98 isolates obtained, 66 produced CO2 from glucose and 16 were then selected for their ability to grow in the presence of 8% ethanol, 20% glucose, pH 3 and maltose. The overall survival of isolates ranged from 4.12 ± 1.63 to 104.25 ± 0.19% (LT16) and from 0.56 ± 0.20 to 96.74 ± 1.60% (LT66) at pH 3 and pH 2 respectively. All of them have remarkable surface hydrophobicity properties. Based on principal component analysis, 5 isolates were selected as the best. However, only 3 of them, LT16 (the most promising), LT25 identified as Saccharomyces cerevisiae and LT80 as Nakaseomyces delphensis, do not produce a virulence factor. The latter can deconjugate bile salts with a maximum percentage of 60.54 ± 0.12% (LT16) and the highest inhibition of DPPH° radicals was 55.94 ± 1.14% (LT25). In summary, the yeast flora of Sha'a contains yeasts capable of fermenting and producing ethanol while producing bioactive compounds that would benefit the consumer.

Project description:Lactic acid bacteria (LAB) are believed to have health-promoting properties to the host and can be used in therapeutics interventions; intriguingly, they have the property to produce bio-preservatives substances. Therefore, this study aimed to mine probiotics and evaluate their safety, functional properties, and cholesterol-lowering capability. Seven potential probiotic strains were compared from 56 LAB strains isolated from traditional Chinese fermented milk. The results showed that all tested strains are tolerant to gastric acidity (45.5-83.26) and bile salts (11.92-92.91%) and have antibacterial activity against Staphylococcus aureus ATCC25923 and Escherichia coli ATCC25922. Likewise, it lowered the cholesterol levels in vitro by live cells (26.57-45.76%) and dead cells (29.53-50.97%) with remarkable aggregation ability (13.8-43.71%). Antioxidant properties and produce short chain fatty acids (SCFAs) were strain-dependent features. Upon assessment of the safety, Enterococcus faecium NWAFU-BIO-AS14 exhibited virulence factors genes (VFs) of (mur-2ed, odc, and tet(K)) and + hemolysis activity. While Enterococcus faecium NWAFU-BIO-A-B24 and Limosilactobacillus fermentum NWAFU-BIO-B-S6 have VFs of (odc, vanC2, and ant(6)-Ia). Limosilactobacillus fermentum NWAFU-BIO-D-B2 has only (odc). Thus, they are not considered as safe probiotics. In contrast, Lactiplantibacillus plantarum NWAFU-BIO-BS29, Companilactobacillus crustorum NWAFU-BIO-AS16, and Lactobacillus gallinarum NWAFU-BIO-D-S7 are the safest and best strains, respectively, due to the absence of 16 VFs and their sensitivity to antibiotics such as kanamycin, erythromycin, tetracycline, gentamycin, vancomycin, streptomycin, chloramphenicol, and ampicillin. Accordingly, these strains have a high potentiality to be used as starter cultures or safely applied as perfect probiotics in functionals food and feed.Supplementary informationThe online version contains supplementary material available at 10.1007/s13205-022-03403-z.

Dataset Information

Probiotic lactic acid bacteria isolated from traditional cameroonian palm wine and corn beer exhibiting cholesterol lowering activity.

Publications

<i>Probiotic lactic</i> acid bacteria isolated from traditional cameroonian palm wine and corn beer exhibiting cholesterol lowering activity.

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