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Dynamics of bacterial communities and substrate conversion during olive-mill waste dark fermentation: prediction of the metabolic routes for hydrogen production

ABSTRACT: Dark fermentation and prediction of the metabolic routes for hydrogen production

PROVIDER: PRJEB39662 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR4392010_1.fastq.gz	Fastqsanger.gz
	ERR4392010_2.fastq.gz	Fastqsanger.gz
	ERR4392011_1.fastq.gz	Fastqsanger.gz
	ERR4392011_2.fastq.gz	Fastqsanger.gz
	ERR4392012_1.fastq.gz	Fastqsanger.gz

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Polyphenols from olive mill waste affect biofilm formation and motility in Escherichia coli K12

Project description:Genome-wide transcriptional analysis was performed on E. coli K12 exposed to 1 mg/ml of olive vegetation water phenolic extract (OVWPE) in planktonic condition.

2012-11-09 | GSE42205 | GEO

Polyphenols from olive mill waste affect biofilm formation and motility in Escherichia coli K12

Project description:Genome-wide transcriptional analysis was performed on E. coli K12 exposed to 1 mg/ml of olive vegetation water phenolic extract (OVWPE) in planktonic condition. Three groups of samples were considered: P group (three replicate cultures with OVWPE extract diluted in ethanol 20%), E group (three replicate cultures with ethanol 20% alone) C group (three control replicate cultures). 1 ml of VWPE extract (1 mg/ml), 1 ml of ethanol 20% and 1 ml of LB broth were added respectively to the three groups when the OD600 of each culture reached 0.4. Cultures were sampled (2 ml) at the time of treatment (t1), 20 (t2) and 40 (t3) minutes after treatment.

2012-11-09 | E-GEOD-42205 | biostudies-arrayexpress

Olive Mill Waste Enhances ?-Glucan Content in the Edible Mushroom Pleurotus eryngii.

Project description:Mushroom polysaccharides are edible polymers that have numerous reported biological functions; the most common effects are attributed to ?-glucans. In recent years, it became apparent that the less abundant ?-glucans also possess potent effects in various health conditions. Here we explore several Pleurotus species for their total, ? and ?-glucan content. Pleurotus eryngii was found to have the highest total glucan concentrations and the highest ?-glucans proportion. We also found that the stalks (stipe) of the fruit body contained higher glucan content then the caps (pileus). Since mushrooms respond markedly to changes in environmental and growth conditions, we developed cultivation methods aiming to increase the levels of ? and ?-glucans. Using olive mill solid waste (OMSW) from three-phase olive mills in the cultivation substrate. We were able to enrich the levels mainly of ?-glucans. Maximal total glucan concentrations were enhanced up to twice when the growth substrate contained 80% of OMSW compared to no OMSW. Taking together this study demonstrate that Pleurotus eryngii can serve as a potential rich source of glucans for nutritional and medicinal applications and that glucan content in mushroom fruiting bodies can be further enriched by applying OMSW into the cultivation substrate.

| S-EPMC5536052 | biostudies-literature

Genomic hybridization of Methanobacteria to identify the diversity in strains on manure and olive mill waste.

Project description:Population dynamics of methanogenic genera was investigated in pilot anaerobic digesters. Cattle manure and two-phase olive mill wastes were codigested at a 3:1 ratio in two reactors operated at 37 ï¾°C and 55 ï¾°C. Other two reactors were run with either residue at 37 ï¾°C. Sludge DNA extracted from samples taken from all four reactors on days 4, 14 and 28 of digestion was used for hybridisation with the AnaeroChip, an oligonucleotide microarray targeting those groups of methanogenic archaea that are commonly found under mesophilic and thermophilic conditions (Franke-Whittle et al. 2009, in press, doi:10.1016/j.mimet.2009.09.017).

2010-11-10 | E-MEXP-2453 | biostudies-arrayexpress

Environmental Impact of Food Preparations Enriched with Phenolic Extracts from Olive Oil Mill Waste.

Project description:Reducing food waste as well as converting waste products into second-life products are global challenges to promote the circular economy business model. In this context, the aim of this study is to quantify the environmental impact of lab-scale food preparations enriched with phenolic extracts from olive oil mill waste, i.e., wastewater and olive leaves. Technological (oxidation induction time) and nutritional (total phenols content) parameters were considered to assess the environmental performance based on benefits deriving by adding the extracts in vegan mayonnaise, salad dressing, biscuits, and gluten-free breadsticks. Phenolic extraction, encapsulation, and addiction to the four food preparations were analyzed, and the input and output processes were identified in order to apply the life cycle assessment to quantify the potential environmental impact of the system analyzed. Extraction and encapsulation processes characterized by low production yields, energy-intensive and complex operations, and the partial use of chemical reagents have a non-negligible environmental impact contribution on the food preparation, ranging from 0.71% to 73.51%. Considering technological and nutritional aspects, the extraction/encapsulation process contributions tend to cancel out. Impacts could be reduced approaching to a scale-up process.

| S-EPMC8147005 | biostudies-literature

Polyphenols from olive mill waste affect biofilm formation and motility in Escherichia coli K-12.

Project description:Olive mill wastes are sources of phenolic compounds with a wide array of biological activities, including antimicrobial effects. A potential option for bioremediation to overcome ecological problems is the reutilization of these natural compounds in food production. The aim of this work was to gain a better understanding of the antimicrobial mode of action of a phenols extract from olive vegetation water (PEOVW) at molecular level by studying Escherichia coli as a model microorganism. Genome-wide transcriptional analysis was performed on E. coli K-12 exposed to PEOVW. The repression of genes for flagellar synthesis and the involvement of genes linked to biofilm formation and stress response were observed. Sub-inhibitory concentrations of PEOVW significantly decreased biofilm formation, swarming and swimming motility, thus confirming the gene expression data. This study provides interesting insights on the molecular action of PEOVW on E. coli K-12. Given these anti-biofilm properties and considering that biofilm formation is a serious problem for the food industry and human health, PEOVW has proved to be a high-value natural product.

| S-EPMC3992022 | biostudies-literature

Effect of ultrasonic pretreatment on biomethane potential of two-phase olive mill solid waste: kinetic approach and process performance.

Project description:The effect of ultrasound (US) pretreatment on two-phase olive mil solid waste (OMSW) composition and subsequent anaerobic biodegradation was evaluated by chemical oxygen demand solubilization and biochemical methane potential (BMP) tests. OMSW was ultrasonically pretreated at a power of 200 W and frequency of 24 kHz for time periods of 20, 40, 60, 90, 120, and 180 minutes, corresponding to specific energies of 11367, 21121, 34072, 51284, 68557, and 106003 kJ/kg total solids, respectively. In order to evaluate the US pretreatment, a low, medium, and high exposure time, that is, 20, 90, and 180 min, were selected for BMP tests. Methane yields of 311 ± 15, 393 ± 14, and 370 ± 20 mL CH₄/g VSadded (VS: volatile solids) were obtained for 20, 90, and 180 minutes, respectively, while the untreated OMSW gave 373 ± 4 mL CH₄/g VSadded. From a kinetic point of view, the BMP tests showed a first exponential stage and a second sigmoidal stage. In the first stage, the kinetic constant obtained for US pretreated OMSW at 20 minutes was 46% higher than those achieved for the pretreated OMSW at 90 and 180 minutes and 48% higher than that for untreated OMSW. The maximum methane production rate achieved was 12% higher than that obtained for untreated OMSW.

| S-EPMC4146379 | biostudies-other

Effects of Dietary Polyphenols from Olive Mill Waste Waters on Inflammatory and Apoptotic Effectors in Rabbit Ovary.

Project description:The aim of this study was to evaluate the effect of dietary polyphenols on the expression of the effectors involved in inflammation and apoptosis in rabbit ovary. New Zealand White female rabbits were fed a basal control diet (CTR), or the same diet supplemented with a polyphenolic concentrate (POL, 282.4 mg/kg) obtained from olive mill waste waters. The follicle counts and the relative mRNA (RT-qPCR) and protein (immunohistochemistry) expression of the effectors involved in inflammation (cyclooxygenase-2; interleukin-1beta; tumor necrosis factor-alpha, TNFA) and apoptosis (BCL2-associated X protein, BAX), detected in the ovaries of both groups, were examined. The POL diet increased the primary and total follicles number. Cyclooxygenase-2 gene expression was higher (p < 0.05) in the POL group than in the CTR group, whereas BAX was lower (p < 0.05) in POL than CTR. Immunohistochemistry revealed the presence of all the proteins examined, with weaker (p < 0.05) COX2 and BAX signals in POL. No differences between the CTR and POL groups were observed for IL1B and TNFA gene and protein expression. These preliminary findings show that dietary polyphenols modulate inflammatory and apoptotic activities in rabbit ovary, regulating cyclooxygenase-2 and BAX expression, thus suggesting a functional involvement of these dietary compounds in mammalian reproduction.

| S-EPMC8228552 | biostudies-literature

Olive Mill Waste-Water Extract Enriched in Hydroxytyrosol and Tyrosol Modulates Host–Pathogen Interaction in IPEC-J2 Cells

Project description: Not available

| S-EPMC10886184 | biostudies-literature

Consolidated bioethanol production from olive mill waste: Wood-decay fungi from central Morocco as promising decomposition and fermentation biocatalysts.

Project description:Meknes region is a Moroccan olive-processing area generating high amounts of non-valorized Olive Mill Waste (OMW). Fungi are natural decomposers producing varied enzyme classes and effectively contributing to the carbon cycle. However, structural complexity of biomass and modest performances of wild fungi are major limits for local biorefineries. The objective of current research is to assess the ability of local fungi for bioethanol production from OMW using Consolidated Bioprocessing (CBP). This is done by characterizing lignocellulolytic potential of six wood-decay and compost-inhabiting ascomycetes and selecting potent fermentation biocatalysts. High and diversified activities were expressed by Fusarium solani and Fusarium oxysporum: 9.36 IU. mL-1 and 2.88 IU. mL-1 total cellulase activity, 0.54 IU. mL-1 and 0.57 IU. mL-1 laccase activity, respectively, and 8.43 IU. mL-1 lignin peroxidase activity for the latter. F. oxysporum had maximum bioethanol production and yield of 2.47 g.L-1 and 0.84 g.g-1, respectively, qualifying it as an important bio-agent for single-pot local biorefinery.

| S-EPMC7578684 | biostudies-literature

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