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https://www.readbyqxmd.com/read/28527992/enzymatic-and-acidic-degradation-of-high-molecular-weight-dextran-into-low-molecular-weight-and-its-characterizations-using-novel-diffusion-ordered-nmr-spectroscopy
#1
Samina Iqbal, Roberta Marchetti, Afsheen Aman, Alba Silipo, Shah Ali Ul Qader, Antonio Molinaro
Low molecular weight fractions were derived from native high molecular weight dextran produced by Leuconostoc mesenteroides KIBGE-IB26. Structural characterization of native and low molecular weight fractions obtained after acidic and enzymatic hydrolysis was done using FTIR and NMR spectroscopy. The molecular weight was estimated using Diffusion Ordered NMR spectroscopy. Native dextran (892kDa) is composed of α-(1→6) glycosidic linkage along with α-(1→3) branching. Major proportion of 528kDa dextran was obtained after prolong enzymatic hydrolysis however, an effective acidic treatment at pH-1...
May 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28527125/diversity-and-probiotic-potential-of-lactic-acid-bacteria-isolated-from-horreh-a-traditional-iranian-fermented-food
#2
Alireza Vasiee, Behrooz Alizadeh Behbahani, Farideh Tabatabaei Yazdi, Seyed Ali Mortazavi, Hamid Noorbakhsh
The aim of this study was to evaluate the probiotic potential of lactic acid bacteria (LAB) strains isolated from Horreh. Some probiotic properties, e.g., resistance to acid, bile tolerance, antibacterial activity, and antibiotic susceptibility, were investigated. A total of 140 Gram-positive and catalase-negative isolates from Horreh were subjected to identification and grouping by cultural methods and the 16S rRNA sequencing. The new isolates were identified to be Lactobacillus (fermentum, plantarum, and brevis) Weissella cibaria, Enterococcus (faecium and faecalis), Leuconostoc (citreum and mesenteroides subsp...
May 19, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28522302/infective-endocarditis-due-to-leuconostoc-species
#3
Pablo Elpidio García-Granja, Javier López, Raquel Ladrón, J Alberto San Román
No abstract text is available yet for this article.
May 15, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28512456/proline-based-cyclic-dipeptides-from-korean-fermented-vegetable-kimchi-and-from-leuconostoc-mesenteroides-lbp-k06-have-activities-against-multidrug-resistant-bacteria
#4
Rui Liu, Andrew H Kim, Min-Kyu Kwak, Sa-Ouk Kang
Lactobacillus plantarum and Leuconostoc mesenteroides play a prominent role as functional starters and predominant isolates in the production of various types of antimicrobial compound-containing fermented foods, especially including kimchi. In the case of the bioactive cyclic dipeptides, their racemic diastereomers inhibitory to bacteria and fungi have been suggested to come solely from Lactobacillus spp. of these strains. We previously demonstrated the antifungal and antiviral activities of proline-based cyclic dipeptides, which were fractionated from culture filtrates of Lb...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28509952/high-yield-production-of-mannitol-by-leuconostoc-pseudomesenteroides-ctcc-g123-from-chicory-derived-inulin-hydrolysate
#5
Min Zhang, Lei Gu, Chao Cheng, Junru Zhu, Hao Wu, Jiangfeng Ma, Weiliang Dong, Xiangping Kong, Min Jiang, Pingkai Ouyang
Chicory is an agricultural plant with considerable potential as a carbohydrate substrate for low-cost production of biochemicals. In this work, the production of mannitol by Leuconostoc pseudomesenteroides CTCC G123 from chicory-derived inulin hydrolysate was investigated. The bioconversion process initially suffered from the leakage of fructose to the phosphoketolase pathway, resulting in a low mannitol yield. When inulin hydrolysate was supplemented with glucose as a substrate for mannitol production in combination with aeration induction and nicotinic acid induced redox modulation strategies, the mannitol yield greatly improved...
May 16, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28489022/lactic-fermentation-as-an-efficient-tool-to-enhance-the-antioxidant-activity-of-tropical-fruit-juices-and-teas
#6
Amandine Fessard, Ashish Kapoor, Jessica Patche, Sophie Assemat, Mathilde Hoarau, Emmanuel Bourdon, Theeshan Bahorun, Fabienne Remize
Tropical fruits like pineapple, papaya, mango, and beverages such as green or black teas, represent an underestimated source of antioxidants that could exert health-promoting properties. Most food processing technologies applied to fruit beverages or teas result in an impairment of inherent nutritional properties. Conversely, we hypothesise that lactic acid fermentation may constitute a promising route to maintain and even improve the nutritional qualities of processed fruits. Using specific growth media, lactic acid bacteria were selected from the fruit phyllosphere diversity and fruit juice, with the latter undergoing acidification kinetics analyses and characterised for exopolysaccharide production...
May 10, 2017: Microorganisms
https://www.readbyqxmd.com/read/28477145/efficient-production-of-prebiotic-gluco-oligosaccharides-in-orange-juice-using-immobilized-and-co-immobilized-dextransucrase
#7
Jagan Mohan Rao Tingirikari, Wesley Faria Gomes, Sueli Rodrigues
Dextransucrase from Leuconostoc mesenteroides NRRL B-512F was subjected to immobilization and co-immobilization with dextranase from Chaetomium erraticum. Immobilization has enhanced the operational and storage stability of dextransucrase. Two hundred milligrammes (2.4 IU/mg) of alginate beads (immobilized and co-immobilized) were found to be optimum for the production of gluco-oligosaccharides (GOS) in orange juice with a high degree of polymerization. The pulp of the orange juice did not interfere in the reaction...
May 6, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28475210/enhanced-d-lactic-acid-production-by-recombinant-saccharomyces-cerevisiae-following-optimization-of-the-global-metabolic-pathway
#8
Ryosuke Yamada, Kazuki Wakita, Ryosuke Mitsui, Hiroyasu Ogino
Utilization of renewable feedstocks for the production of bio-based chemicals such as d-lactic acid by engineering metabolic pathways in the yeast Saccharomyces cerevisiae has recently become an attractive option. In this study, to realize efficient d-lactic acid production by S. cerevisiae, the expression of 12 glycolysis-related genes and the Leuconostoc mesenteroides d-LDH gene was optimized using a previously developed global metabolic engineering strategy, and repeated batch fermentation was carried out using the resultant strain YPH499/dPdA3-34/DLDH/1-18...
May 5, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28465057/functional-analysis-of-truncated-and-site-directed-mutagenesis-dextransucrases-to-produce-different-type-dextrans
#9
Chao Wang, Hong-Bin Zhang, Meng-Qi Li, Xue-Qin Hu, Yao Li
Dextrans with distinct molecular size and structure are increasingly being used in the food and pharmaceutical industries. Dextran is produced by dextransucrase (DSR, EC2.4.5.1), which is produced by Leuconostoc mesenteroides. DSR belongs to glycosyl hydrolase family (GH70) and synthesizes branched α-glucan (dextran) with both 5% α(1-3) and 95% α(1-6) glycosidic linkages. The DSR gene dex-YG (Genebank, Accession No. DQ345760) was cloned from the wild strain Leuconostoc mesenteroides 0326. This study generated a series of C-terminally truncated variants of dextransucrase and substituting the amino-acid residues in the active site of DSR...
July 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28460980/microbial-diversity-in-pitted-sweet-cherries-prunus-avium-l-as-affected-by-high-hydrostatic-pressure-treatment
#10
Julia Toledo Del Árbol, Rubén Pérez Pulido, Antonietta La Storia, Maria José Grande Burgos, Rosario Lucas, Danilo Ercolini, Antonio Gálvez
Sweet cherries are a highly appreciated seasonal fruit rich in anthocyanins. The purpose of the present study was to determine the effect of High-Hydrostatic Pressure (HHP) processing on the microbiological quality and bacterial biodiversity of sweet cherries. Pitted cherries inoculated with their own epiphyte microbiota to simulate a worst-case scenario of contamination during preparation and processing were treated or not by HHP (600MPa, 8min) and stored at 4°C for 60days. HHP treatment reduced total viable counts by 4...
November 2016: Food Research International
https://www.readbyqxmd.com/read/28460971/microbial-communities-related-to-sensory-attributes-in-korean-fermented-soy-bean-paste-doenjang
#11
Min Jung Kim, Han Sub Kwak, Hee Yeon Jung, Sang Sook Kim
Various microbial communities play a role in generating the distinctive sensory characteristics of the traditional Korean soybean paste, doenjang. The objective of this study was to investigate the relationship between sensory characteristics and microbial communities in traditional doenjang. The results of the descriptive analysis revealed that some traditional doenjang (T1-T11) exhibited distinctive characteristics, such as fish sauce flavor, meju, bitterness, sourness, and saltiness, whereas the modified samples (M1-M3) demonstrated sweetness, umami, and an alcohol odor...
November 2016: Food Research International
https://www.readbyqxmd.com/read/28460943/ancestral-andean-grain-quinoa-as-source-of-lactic-acid-bacteria-capable-to-degrade-phytate-and-produce-b-group-vitamins
#12
Silvana L Carrizo, Cecilia E Montes de Oca, Jonathan E Laiño, Nadia E Suarez, Graciela Vignolo, Jean Guy LeBlanc, Graciela Rollán
The lactic acid bacteria (LAB) microbiota of quinoa grains (QG) and spontaneous sourdough (QSS) was evaluated. Different strains of Lactobacillus (L.) plantarum (7), L. rhamnosus (5), L. sakei (1), Pediococcus (Ped.) pentosaceus (9), Leuconostoc (Leuc.) mesenteroides (1), Enterococcus (E.) casseliflavus (2), E. mundtii (3), E. hirae (1), E. gallinarum (12), Enterococcus sp. (1), and E. hermanniensis (2) were isolated, identified and characterized. Only four strains isolated from QSS and eight strains isolated from QG showed amylolytic activity...
November 2016: Food Research International
https://www.readbyqxmd.com/read/28457443/dextran-production-by-lactobacillus-sakei-mn1-coincides-with-reduced-autoagglutination-biofilm-formation-and-epithelial-cell-adhesion
#13
Montserrat Nácher-Vázquez, Iñaki Iturria, Kenza Zarour, Maria Luz Mohedano, Rosa Aznar, Miguel Ángel Pardo, Paloma López
In this work we have investigated two dextran-producing lactic acid bacteria, Lactobacillus sakei MN1 and Leuconostoc mesenteroides RTF10, isolated from fermented meat products. These bacteria synthesise dextran when sucrose, but not glucose, is present in the growth medium. The influence of dextran on bacterial aggregation, adhesion and biofilm formation was investigated in cultures challenged with sucrose or glucose. For Lb. sakei MN1, the synthesis of the dextran drastically impaired the three processes; in contrast it had no effect on Lc...
July 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28454704/the-normal-vaginal-and-uterine-bacterial-microbiome-in-giant-pandas-ailuropoda-melanoleuca
#14
Xin Yang, Guangyang Cheng, Caiwu Li, Jiang Yang, Jianan Li, Danyu Chen, Wencheng Zou, SenYan Jin, Hemin Zhang, Desheng Li, Yongguo He, Chengdong Wang, Min Wang, Hongning Wang
While the health effects of the colonization of the reproductive tracts of mammals by bacterial communities are widely known, there is a dearth of knowledge specifically in relation to giant panda microbiomes. In order to investigate the vaginal and uterine bacterial diversity of healthy giant pandas, we used high-throughput sequence analysis of portions of the 16S rRNA gene, based on samples taken from the vaginas (GPV group) and uteri (GPU group) of these animals. Results showed that the four most abundant phyla, which contained in excess of 98% of the total sequences, were Proteobacteria (59...
June 2017: Microbiological Research
https://www.readbyqxmd.com/read/28453942/enzymatic-production-of-melibiose-from-raffinose-by-the-levansucrase-from-leuconostoc-mesenteroides-b-512-fmc
#15
Wei Xu, Shuhuai Yu, Qian Liu, Tao Zhang, Bo Jiang, Wanmeng Mu
Melibiose, which is an important reducing disaccharide formed by α-1,6 linkage between galactose and glucose, has been proven to have beneficial applications in both medicine and agriculture. In this study, a characterized levansucrase from Leuconostoc mesenteroides B-512 FMC was further used to study the bioproduction of melibiose from raffinose. The reaction conditions were optimized for melibiose synthesis. The optimal pH, temperature, substrate concentration, ratio of substrates, and units of enzymes were determined as pH 6...
May 5, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28440871/effects-of-different-salt-treatments-on-the-fermentation-metabolites-and-bacterial-profiles-of-kimchi
#16
Dong Wook Kim, Bo-Min Kim, Hyeon-Jeong Lee, Gwang-Ju Jang, Seong Hwa Song, Jae-In Lee, Sang Bong Lee, Jae Min Shim, Kang Wook Lee, Jeong Hwan Kim, Kyung-Sik Ham, Feng Chen, Hyun-Jin Kim
The effects of purified salt (PS) and mineral-rich sea salt (MRS), both with different mineral profiles, on kimchi fermentation were studied using a culture-dependent 16S rRNA sequencing technique and mass-based metabolomic analysis. The different mineral profiles in the fermentation medium caused changes in the bacterial profiles of the 2 kimchi products. An increase of Leuconostoc species in MRS-kimchi decreased the Lactobacillus/Leuconostoc ratio, which led to changes in metabolites (including sugars, amino acids, organic acids, lipids, sulfur compounds, and terpenoids) associated with kimchi quality...
May 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28439768/discrimination-of-wine-lactic-acid-bacteria-by-raman-spectroscopy
#17
Susan B Rodriguez, Mark A Thornton, Roy J Thornton
Species of Lactobacillus, Pediococcus, Oenococcus, and Leuconostoc play an important role in winemaking, as either inoculants or contaminants. The metabolic products of these lactic acid bacteria have considerable effects on the flavor, aroma, and texture of a wine. However, analysis of a wine's microflora, especially the bacteria, is rarely done unless spoilage becomes evident, and identification at the species or strain level is uncommon as the methods required are technically difficult and expensive. In this work, we used Raman spectral fingerprints to discriminate 19 strains of Lactobacillus, Pediococcus, and Oenococcus...
April 24, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28439679/screening-lactic-acid-bacteria-strains-with-ability-to-bind-di-n-butyl-phthalate-via-turbiscan-technique
#18
Zhao Lili, Zhao Hongfei, Sana Shoukat, Zhang Xiaochen, Zhang Bolin
Di-n-butyl phthalate (DBP) is a ubiquitous environmental contaminant that poses a risk to humans. Previous work indicates that the ability of lactic acid bacteria (LAB) to bind phthalic acid esters is strain-specific. As cell suspensions of LAB strains in aqueous solution are likely to be colloidal dispersions, this study provided a technique to efficiently screen LAB strains that bind DBP via Turbiscan, which has been widely used to measure the stability of emulsions or colloidal dispersions. Eleven LAB strains belonging to Lactobacillus plantarum, Lb...
April 24, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28433723/elimination-of-the-cryptic-plasmid-in-leuconostoc-citreum-by-crispr-cas9-system
#19
Ye-Ji Jang, Seung-Oh Seo, Seul-Ah Kim, Ling Li, Tae-Jip Kim, Sun Chang Kim, Yong-Su Jin, Nam Soo Han
Leuconostoc spp. are important lactic acid bacteria for the fermentation of foods. In particular, L. citreum strains isolated from various foods have been used as host strains for genetic and metabolic engineering studies. In order to develop a food-grade genetic engineering system, L. citreum CB2567 was isolated from Kimchi. However, the isolated bacterium contained a cryptic plasmid which was difficult to eliminate. As the existence of the plasmid might hinder strain engineering, we eliminated the plasmid using an RNA-guided DNA endonuclease CRISPR/Cas9 system...
April 19, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28431310/characterization-of-bacterial-communities-of-donkey-milk-by-high-throughput-sequencing
#20
Maria de Los Dolores Soto Del Rio, Alessandra Dalmasso, Tiziana Civera, Maria Teresa Bottero
The interest in donkey milk (DM) is growing because of its functional properties and nutritional value, especially for children with allergies and food intolerances. However, most of the available reports of DM microbiota are based on culture-dependent methods to investigate food safety issues and the presence of lactic acid bacteria (LAB). The aim of this study was to determine the composition of DM bacterial communities using a high-throughput sequencing (HTS) approach. Bulk milk samples from Italian donkey dairy farms from two consecutive years were analysed using the MiSeq Illumina platform...
March 30, 2017: International Journal of Food Microbiology
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