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Microbial community and volatilome changes in brines along the spontaneous fermentation of Spanish-style and Natural-style green table olives (Manzanilla cultivar)

ABSTRACT: Microbial community and volatilome changes in brines along the spontaneous fermentation of Spanish-style and Natural-style green table olives (Manzanilla cultivar)

PROVIDER: PRJEB61009 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR11193139_1.fastq.gz	Fastqsanger.gz
	ERR11193139_2.fastq.gz	Fastqsanger.gz
	ERR11192792_1.fastq.gz	Fastqsanger.gz
	ERR11192792_2.fastq.gz	Fastqsanger.gz
	ERR11202959_1.fastq.gz	Fastqsanger.gz

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Microbial dynamics of Spanish- and Greek-style table olives fermented with sea fennel

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Draft Genome Sequences of Six Lactobacillus pentosus Strains Isolated from Brines of Traditionally Fermented Spanish-Style Green Table Olives.

Project description:Here, we report the genome sequences of six Lactobacillus pentosus strains isolated from traditional noninoculated Spanish-style green table olive brines. The total genome sizes varied between 3.77 and 4.039 Mbp. These genome sequences will assist in revealing the genes responsible for both technological and probiotic properties of these strains.

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Microbiota and Metabolite Profiling of Spoiled Spanish-Style Green Table Olives.

Project description:The aim of the present study was to assess the malodorous spoilages of Spanish-style green table olives through microbial and metabolite composition using current measuring techniques (e.g., high-throughput DNA sequencing, headspace solid-phase microextraction combined with gas chromatography-mass spectrometry). Under different alkaline and washing conditions, the spoilage fermentations were reproduced with Gordal and Manzanilla olive cultivars using a low salt concentration (71 g L-1 NaCl) in the initial brine. The degradation of lactic acid and significant increases in volatile fatty acids and phenols were found in all the spoiled samples in comparison with the unspoiled control samples. According to high-throughput DNA sequencing, Cardiobacteriaceae and Ruminococcus were the dominant bacteria in the spoiled samples. PLS regression and Pearson's correlation coefficient analyses revealed positive and negative correlations among microbial communities, metabolites, and sensory spoilage descriptors. Notably, the "zapatera" descriptor was significantly associated with Propionibacterium, which was positively correlated with acetic acid, propionic acid, succinic acid, and methyl propanoate; while the "butyric" descriptor exhibited a significant positive relationship with the genus Ruminococcus, which gave an almost significant correlation with propionic and butyric acids.

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Data on green Spanish-style Manzanilla table olives fermented in salt mixtures.

Project description:This article contains processed data related to the research published in "Fermentation in nutrient salt mixtures affects green Spanish-style Manzanilla table olives" [1]. It displays information on the salt substitution by other nutrient salts (potassium chloride and calcium chloride) during fermentation of green Spanish-style Manzanilla table olives to produce healthier products. Particularly, it studies the relationship between the different colour parameters (L*, a*, b* and C i), firmness, and sensory attributes (saltiness, bitterness, hardness, and fibrousness), and the composition of the initial brine in NaCl, KCl, and CaCl2. The composition of the brines affected the characteristics of the product. In general, the higher was the proportion of CaCl2 in the initial brines the better was the colour. Also, the presence of this salt mitigated the saltiness perception but increment those of bitterness, hardness, fibrousness, and crunchiness. Besides, most of the sensory attribute scores could successfully be predicted as a function of the Na, K, and Ca concentrations in the fermented olive flesh. The work allows the production of table olives with specific characteristics and predetermined mineral nutrient composition.

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Sensory Assessment by Consumers of Traditional and Potentially Probiotic Green Spanish-Style Table Olives.

Project description:This work presents the sensory characterization by consumers of traditionally and potentially probiotic green Spanish-style table olives. To this aim, green Manzanilla olives from the same lot were debittered, washed, and brined in the same way; then, one sub-lot was allowed fermenting spontaneously while another one was inoculated with a putative probiotic bacterium (Lactobacillus pentosus TOMC-LAB2). After fermentation, the olives from both sub-lots were packed with fresh brine to reach 5.5 g/100 mL NaCl and 0.6 g lactic acid/100 mL in the equilibrium. The stabilized olives were then subjected to sensory evaluation by 200 consumers, and the results were analyzed by ANOVA and multivariate statistical techniques. In a first approach, consumers perceived the spontaneously fermented olives as similar to the potentially probiotic product. However, a biplot based on Canonical Variate Analysis (CVA) showed differences between them in the Salty and Overall score. When data from the consumer test were assessed by PLS analysis, regardless of the fermentation system, Overall score, and Buying predisposition were significantly driven by Appearance, Odor, Salty (negatively), Hardness, and Crispness.

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Data on sensory profile of green Spanish-style table olives studied by Quantitative Descriptive Analysis.

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Data on fatty acid profiles of green Spanish-style Gordal table olives studied by compositional analysis.

Project description:This article contains processed data related to the research published in "Tentative application of compositional data analysis to fatty acid profiles of green Spanish-style Gordal table olives" (Garrido-Fernández et al., 2018) [1]. It provides information on the implementation of compositional data analysis (CoDa) to the fatty acid profiles of Spanish-style Gordal table olives vs the use of conventional statistical analysis (data composition expressed in percentages). Particularly, it includes: i) the matrix of the sequential binary partition used for the balance estimation and the isometric log-ratio transformation (ilr) of the fatty acid profiles, ii) correlation among the diverse fatty acids expressed in percentages and their significances, iii) the ilr transformed values (coordinates in the Euclidean space) obtained following the sequential binary partition previously detailed, iv) the graphical presentation in the Simplex (ternary centred plot) of the treatments as a function of the four fatty acids with the higher log-ratio variances, and v) segregation of treatments based on Cluster Analysis.

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Flavored Olive Oil as a Preservation Means of Reduced Salt Spanish Style Green Table Olives (cv. Chalkidiki).

Project description:Reformulation of products fermented in brine is a challenging area of research. Continuing the efforts toward the establishment of table olives as a healthy food for all population groups, this study aimed at examining whether olive oil flavored with essential oils can be used as a preservation means for reduced salt Spanish style green table olives (cv. Chalkidiki). Response surface methodology was applied to organize experimentation and assess data. As independent factors, concentrations of the essential oils used (oregano, lemon balm and bay laurel) and time of storage under vacuum were set. Microbiological parameters (pathogens and fermentation-related microbes), color and firmness attributes were used as responses. Models indicated that each essential oil exerted a preservative role to maintain microbiological quality of reduced salt table olives. Concurrently, appearance attributes of the latter were retained at desirable values. Oregano essential oil had a profound role against pathogens. Lemon balm and bay laurel essential oils were found to be important for yeast population control. The results are promising toward the use of flavored olive oil as a preservation means for tailor-made reduced salt table olives, a practice that may enhance local industry innovative activity in a practical and effective way.

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Bioaccessibility of Mineral Nutrients in Plain Green Spanish-Style Manzanilla Table Olives Packaged in Nutrient Salt Mixtures.

Project description:Table olives are high in salt, which can negatively impact cardiovascular health. It is essential to reduce their salt content to mitigate such risk. The objectives of the study were to develop an appropriate protocol to determine mineral bioaccessibility in green Spanish-style Manzanilla table olives and to use it to evaluate, for the first time, the effects of replacing 50% NaCl in the packaging brine with KCl, CaCl2, and MgCl2 on this characteristic. After testing, Miller's protocol with a post-digestion re-extraction was chosen. The mineral bioaccessibility found was as follows: Na, 93-98%; K, 94-100%; Ca, 19-27% (the lowest accessibility); Mg, 78-91% (moderately accessible); and non-added P, 55-67%. Bioaccessible amounts (mg/100 g pulp) of added minerals in runs were 151-503 for K, 53-109 for Ca, and 54-143 for Mg. The bioaccessible mineral vs. salt concentrations were modelled and plotted using RSM, illustrating the possible predictions from the tested range of combinations. The bioaccessibility of Ca and Mg was approximately 70% and 15% lower than the values indicated on the label based on the chemical analysis. The results discourage Ca fortification in packaging and suggest including bioaccessibility, markedly influenced by the food matrix, on the label for accurate nutritional information.

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