Madrid Albarrán, María Yolanda

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First Name
María Yolanda
Last Name
Madrid Albarrán
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Química Analítica
Química Analítica
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Now showing 1 - 5 of 5
  • Publication
    Selenium and tellurium-based nanoparticles as interfering factors in quorum sensing-regulated processes: violacein production and bacterial biofilm formation
    (RSC, 2019-04-16) Gómez Gómez, Beatriz; Arregui García-Roves, Lucía; Serrano Barrero, Susana Lourdes; Santos De La Sen, Antonio; Pérez Corona, María Teresa; Madrid Albarrán, María Yolanda
    A cell-to-cell communication system called quorum sensing (QS) promotes the transcription of certain target genes in bacterial cells leading to the activation of different cellular processes, some of them related to bacterial biofilm formation. The formation of bacterial biofilms favours antibiotic resistance, which is nowadays a significant public-health problem. In this study, the effect of selenium (SeNPs) and tellurium (TeNPs) nanoparticles was examined in two bacterial processes mediated by QS: violacein production by Chromobacterium violaceum and biofilm formation by Pseudomonas aeruginosa. For this purpose, quantification of the pigment production in the presence of these nanoparticles was monitored using the C. violaceum strain. Additionally, a combination of different microscopical imaging techniques was applied to examine the changes in the 3D biofilm structure of P. aeruginosa, which were quantified through performing architectural metric calculations (substratum area, cell area coverage and biovolume). SeNPs produce an 80% inhibition in the violacein production by C. violaceum and a significant effect on the P. aeruginosa biofilm architecture (a reduction of 80% in the biovolume of the bacterial biofilm was obtained). TeNPs similarly affect violacein production and the P. aeruginosa biofilm structure but at lower concentration levels. The results obtained suggest an important disruption of the QS signalling system by SeNPs and TeNPs, supporting nanotechnology as a promising tool to fight against the emerging problem of bacterial resistance related to bacterial biofilm formation.
  • Publication
    Availability of zinc from infant formula by in vitro methods (solubility and dialyzability) and size-exclusion chromatography coupled to inductively coupled plasma-mass spectrometry
    (Elsevier, 2016-12-01) Gómez Gómez, Beatriz; Pérez Corona, María Teresa; Madrid Albarrán, María Yolanda
    Zinc bioaccessibility from infant formula was estimated by in vitro methods (solubility and dialyzability) and size-exclusion chromatography (SEC) coupled to inductively coupled plasma-mass spectrometry (ICP-MS). Infant formula samples were first characterized in terms of Zn bound to lipids and proteins and Zn distribution in the aqueous soluble protein fraction. We found that Zn is not incorporated into the lipid fraction of the samples, being mainly associated with the protein fraction (around 100%). Fractionation of Zn-containing proteins in the soluble protein fraction was achieved by SEC-ICP-MS after performing protein extraction with a solution of 100 mM (pH 6.8) Tris-HCl. The percentages of zinc in the soluble protein fraction in the soy-based and lactose-free infant formula were very low, around 7 and 24%, respectively, whereas the content of Zn in the soluble protein fraction of milk-based formula was around 90%. By SEC-ICP-MS, we found that Zn is associated with low-molecular weight compounds (around 10 kDa) in all the infant formulas tested. The percentages of Zn estimated in the in vitro gastrointestinal digests of the infant formula ranged from 30 to 70% and from 1 to 10% for solubility and dialyzability assays, respectively. The dialyzability test resulted in lower than expected scores, as SEC-ICP-MS analysis of the gastrointestinal extracts revealed that Zn is bound to biomolecules with a molecular weight ranging from 1 to 7 kDa, which suggests that dialysis data should be interpreted with caution. Speciation studies are a valuable tool for establishing availability of nutrients and for validating data from dialyzable in vitro methods.
  • Publication
    Food prospects of selenium enriched-Lactobacillus acidophilus CRL 636 and Lactobacillus reuteri CRL 1101
    (Elsevier, 2017-08) Pescuma, Micaela; Gómez Gómez, Beatriz; Pérez Corona, María Teresa; Font, Graciela; Madrid Albarrán, María Yolanda; Mozzi, Fernanda
    Selenium, which is present as SeCys in selenoproteins, is involved in cancer prevention, thyroid functioning, and pathogen inhibition. Lactobacilli can biotransform inorganic Se into seleno-amino acids. Growth, Se accumulation and seleno-amino acid formation by Lactobacillus acidophilus CRL636 and L. reuteri CRL1101 in a Se-supplemented medium were studied. Moreover, survival of Se-enriched strains to different pH values and bile salts was analyzed. L. acidophilus CRL636 showed low growth rate in the presence of Se while differences were less evident for L. reuteri CRL1101, which displayed higher amounts of intracellular SeCys and SeMet than the CRL636 strain. Interestingly, both lactobacilli could produce Se-nanoparticles. Se-enriched lactobacilli showed lower growth rates than non-Se exposed cells. The adverse effect of bile salts and the ability to survive at pH 4.0 diminished for the Se-enriched L. reuteri strain. The studied lactobacilli could be used as Se-enriched probiotics or as a vehicle for manufacturing Se-containing fermented foods.
  • Publication
    Unravelling mechanisms of bacterial quorum sensing disruption by metal-based nanoparticles
    (Elsevier, 2019-12-15) Gómez Gómez, Beatriz; Arregui García-Roves, Lucía; Serrano Barrero, Susana Lourdes; Santos De La Sen, Antonio; Pérez Corona, María Teresa; Madrid Albarrán, María Yolanda
    Nanoparticles are released in the environment causing a negative impact in several ecosystems such asmicrobial communities. To adapt to environmental changes some bacteria use a collective behaviour ruled by a cell-to-cell communication process called quorum sensing (QS). In this study, the impact of some of the most employed metal-based nanoparticles, such as zinc oxide nanoparticles (ZnONPs), titanium dioxide nanoparticles (TiO2NPs) and silver nanoparticles (AgNPs) on bacterial QS has been assessed by using two different strains of the model organism Chromobacterium violaceumand by employing different experimental conditions. TiO2NPswere tested with and without applying a previous step of UV-irradiation while the effect of AgNPs of two diameter sizes (40 and 60 nm) and twodifferent coating agents (PVP and citrate)was evaluated. Results evidenced that all nanoparticles produced a significant effect on violacein production and therefore, in the QS system. ZnONPs mainly disrupted the QS steps related to signal perception and response whereas TiO2NPs and AgNPs affected the autoinducer biosynthesis. AgNPs with the smallest size and citrate as capping agent produced the most deleterious effect while the impact of TiO2NPs was not affected by UV irradiation. The present study provides new insights into the mechanisms by which these commonly employed metal-based nanoparticles disturb bacterial QS-based communication and clearly evidences the potential risk of releasing nanoparticles to the environment, especially formicrobial communities which play a key role in many environmental and technological processes.
  • Publication
    Silac-based quantitative proteomic analysis of Lactobacillus reuteri CRL 1101 response to the presence of selenite and selenium nanoparticles
    (Elsevier, 2019-03-20) Gómez Gómez, Beatriz; Pérez Corona, María Teresa; Mozzi, Fernanda; Pescuma, Micaela; Madrid Albarrán, María Yolanda
    Stable isotope labeling in cell culture (SILAC) was applied for the first time on a lactic acid bacterium strain (L. reuteri CRL1101) for analyzing differential protein expression associated to selenite(Na2SeO3) and selenium nanoparticles (SeNPs) exposure. 57 and 47 proteins were found de-regulated by >1,5 fold in presence of selenite and SeNPs, respectively. Only 16 out of 104 proteins differentially expressed were commonly altered by selenite and SeNPs. The use of a clustered heat map allows us to visualize relations between the de-regulated proteins and exposure conditions. We identified a number of proteins involved in diverse functions and biological processes such as metabolism of carbohydrates, selenium and lipids; folding, sorting and degradation; environmental information and processing. In presence of both, selenite and SeNPs, proteins related to selenium metabolism such as cystathione beta-lyase and oxidoreductases (thioredoxine reductase and NAD/FAD oxidoreductase) were over expressed. Interestingly, the over expression of thioredoxin reductase could protect the host from oxidizing compounds. An over expression of phage proteins and chaperones with selenite was observed; this result and the fact that a lower cell count was detected when selenite was added could indicate that this latter Se species has a more deleterious effect than the nanoparticles.