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Sáyago-Ayerdi SG, Venema K, Tabernero M, Sarriá B, Bravo L, Mateos R. Bioconversion of polyphenols and organic acids by gut microbiota of predigested Hibiscus sabdariffa L. calyces and Agave (A. tequilana Weber) fructans assessed in a dynamic in vitro model (TIM-2) of the human colon. Food Res Int 2021; 143:110301. [PMID: 33992321 DOI: 10.1016/j.foodres.2021.110301] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 03/03/2021] [Accepted: 03/03/2021] [Indexed: 12/22/2022]
Abstract
The present work aimed at understanding gut microbiota bioconversion of phenolic compounds (PC) and organic acids in predigested Hibiscus sabdariffa (Hb) calyces and the mixture of Hb and Agave (Agave tequilana Weber) fructans (AF). With this purpose, dried Hb and Hb/AF were predigested with enzymatic treatment, and then fermented in a dynamic in vitro model of the human colon (TIM-2). After HPLC-ESI-QToF-MS analysis of samples taken at 0, 24, 48 and 72 h of fermentation, it was observed that hydroxycinnamic acids, flavanols, flavonols, and anthocyanins were mainly transformed into derivatives of hydroxyphenylpropionic, hydroxyphenylacetic and hydroxybenzoic acids. Moreover, organic acids, such as hydroxycitric and hibiscus acids, were formed along with unidentified lactones and reduced compounds. Interestingly, no differences were observed between microbial-derived metabolites formed after the fermentation of Hb and Hb/AF. In conclusion, colonic fermentation of polyphenol-rich Hb yields a wide range of microbial phenolic metabolites with potential effects on health.
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Affiliation(s)
- S G Sáyago-Ayerdi
- Tecnológico Nacional de México/Instituto Tecnológico de Tepic, Av. Instituto Tecnológico No 2595, Col. Lagos del Country, CP 63175 Tepic, Nayarit, Mexico.
| | - K Venema
- Maastricht University - Campus Venlo, Centre for Healthy Eating & Food Innovation, St. Jansweg 20, 5928 RC Venlo, the Netherlands
| | - M Tabernero
- IMDEA-Food Institute, CEI (UAM+CSIC), Carretera de Canto Blanco, 8, 28049 Madrid, Spain
| | - B Sarriá
- Institute of Food Science, Technology and Nutrition (ICTAN-CSIC), Spanish National Research Council (CSIC), José Antonio Nováis 10, 28040 Madrid, Spain
| | - L Bravo
- Institute of Food Science, Technology and Nutrition (ICTAN-CSIC), Spanish National Research Council (CSIC), José Antonio Nováis 10, 28040 Madrid, Spain
| | - R Mateos
- Institute of Food Science, Technology and Nutrition (ICTAN-CSIC), Spanish National Research Council (CSIC), José Antonio Nováis 10, 28040 Madrid, Spain.
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Pereira MG, Silva JAD, Carmo I, Papoila A, Cardoso A, Conceição C, Gomes M, Neves M, Neves A, Santos L, Mateos R. Preliminary Data from Famidem Survey: Can we assume who is at Risk Regarding Informal Caregiving in Dementia? Eur Psychiatry 2020. [DOI: 10.1016/s0924-9338(09)71333-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Background and aims:In meridional European countries such as Portugal, informal caregivers are almost always close relatives, either key-relatives (those more involved) or not. There are few systematic comparisons between the experience of key-relatives/primary caregivers (PC) and other/secondary caregivers (SC) in psychogeriatrics. We present some preliminary data from the FAMIDEM (Families of People with Dementia) survey.Methods:Non-randomised cross-sectional study comparing two related samples of caregivers (PC versus SC) of 41 patients with DSM-IV dementia from outpatient practices in Lisbon (Portugal). Caregivers’ assessments included: Zarit Burden Interview, Caregiver Activity Survey (CAS), Positive Aspects of Caregiving, GHQ-12, Social Network Questionnaire and Dementia Knowledge Questionnaire.Results:Patients’ mean age was 78,7 years (SD 7,9). 24 (58,5%) were women and 58,5% had Alzheimer disease.PC were older than SC (p=0,000) and tended to live with the patient (p=0,000). They reported less emocional support (p=0,021) but higher objective burden-CAS (p=0,002). Regarding all other outcome variables, significant differences between groups were not found. Within the global sample, comparing spousals (n=23) and adult children/other relatives (n=59) yielded interestingly different preliminary results, eg higher GHQ-12 levels (p=0,010).Conclusions:The experience of caregiving is possibly different regarding PC and SC, but further research is warranted in order to define who really is at risk. Being a spouse may be much more determinant, although most spouses are PC as well. for the moment, it seems prudent not to exclude SC from risk assessments. the final FAMIDEM results, even lacking generalizability, will probably provide interesting clues.
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Gómez-Juaristi M, Sarria B, Goya L, Bravo-Clemente L, Mateos R. Experimental confounding factors affecting stability, transport and metabolism of flavanols and hydroxycinnamic acids in Caco-2 cells. Food Res Int 2020; 129:108797. [DOI: 10.1016/j.foodres.2019.108797] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 10/31/2019] [Accepted: 11/01/2019] [Indexed: 12/13/2022]
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Martínez-López S, Sarriá B, Mateos R, Bravo-Clemente L. Moderate consumption of a soluble green/roasted coffee rich in caffeoylquinic acids reduces cardiovascular risk markers: results from a randomized, cross-over, controlled trial in healthy and hypercholesterolemic subjects. Eur J Nutr 2018; 58:865-878. [DOI: 10.1007/s00394-018-1726-x] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 05/22/2018] [Indexed: 12/20/2022]
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Amigo-Benavent M, Wang S, Mateos R, Sarriá B, Bravo L. Antiproliferative and cytotoxic effects of green coffee and yerba mate extracts, their main hydroxycinnamic acids, methylxanthine and metabolites in different human cell lines. Food Chem Toxicol 2017; 106:125-138. [PMID: 28506698 DOI: 10.1016/j.fct.2017.05.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 04/28/2017] [Accepted: 05/10/2017] [Indexed: 12/18/2022]
Abstract
This work aimed at studying the effects of green coffee bean (GCBE) and yerba mate (YME) extracts, their main phenolic components (5-caffeoylquinic acid, 5-CQA; 3,5-dicaffeoylquinic acid, 3,5-DCQA) and metabolites (ferulic acid, FA; caffeic acid, CA; dihydrocaffeic acid, DHCA; and dihydroferulic acid, DHFA) along with caffeine (CAF) on the viability and proliferation of different human cell lines. Extracts (10-1000 μg/mL) and standards (10-1000 μM) were assayed in colon (Caco-2), lung (A549), oesophageal (OE-33), urinary bladder (T24) human carcinoma cells, and a non-cancer cell line (CCD-18Co). YME significantly reduced viability of cancer cells at all assayed concentrations, the higher doses also reducing cell proliferation. GCBE effects on cell viability were more effective at 100 and 1000 μg/mL, showing modest effects on cell proliferation. The highest doses of 5-CQA and 3,5-DCQA reduced cell viability and proliferation in all cell lines, whereas FA, DHCA and DHFA had lower and variable effects. Caffeine had no effect. Dietary-attainable concentrations (0.1, 1 and 10 μg/mL) of YME were tested for cytotoxicity and reactive oxygen species generation, showing no cytotoxic effect. Low concentrations of all tested compounds were non-cytotoxic to CCD-18Co cells. CONCLUSION YME and to a lower degree GCBE, their phenolic components and metabolites may decrease cancer cell viability and proliferation.
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Affiliation(s)
- M Amigo-Benavent
- Institute of Food Science, Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), C/ Jose Antonio Nováis 10, 28040 Madrid, Spain
| | - S Wang
- Institute of Food Science, Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), C/ Jose Antonio Nováis 10, 28040 Madrid, Spain
| | - R Mateos
- Institute of Food Science, Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), C/ Jose Antonio Nováis 10, 28040 Madrid, Spain
| | - B Sarriá
- Institute of Food Science, Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), C/ Jose Antonio Nováis 10, 28040 Madrid, Spain.
| | - L Bravo
- Institute of Food Science, Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), C/ Jose Antonio Nováis 10, 28040 Madrid, Spain.
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Escapa A, San-Martín MI, Mateos R, Morán A. Scaling-up of membraneless microbial electrolysis cells (MECs) for domestic wastewater treatment: Bottlenecks and limitations. Bioresour Technol 2015; 180:72-78. [PMID: 25590425 DOI: 10.1016/j.biortech.2014.12.096] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 12/22/2014] [Accepted: 12/28/2014] [Indexed: 06/04/2023]
Abstract
Microbial electrolysis cells (MECs) have the potential to become a sustainable domestic wastewater (dWW) treatment system. However, new scale-up experiences are required to gain knowledge of critical issues in MEC designs. In this study we assess the ability of two twin membraneless MEC units (that are part of a modular pilot-scale MEC) to treat dWW. Batch tests yielded COD removal efficiencies as high as 92%, with most of the hydrogen (>80% of the total production) being produced during the first 48h. During the continuous tests, MECs performance deteriorated significantly (energy consumption was relatively high and COD removal efficiencies fell below 10% in many cases), which was attributed to an inadequate configuration of the anodic chamber, insufficient mixing inside this chamber, inefficient hydrogen management on the cathode side and finally to dWW in itself. Some alternatives to the current design are suggested.
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Affiliation(s)
- A Escapa
- Chemical and Environmental Bioprocess Engineering Department, Natural Resources Institute (IRENA), Universidad de León, Av. de Portugal 41, 24071 León, Spain.
| | - M I San-Martín
- Chemical and Environmental Bioprocess Engineering Department, Natural Resources Institute (IRENA), Universidad de León, Av. de Portugal 41, 24071 León, Spain
| | - R Mateos
- Chemical and Environmental Bioprocess Engineering Department, Natural Resources Institute (IRENA), Universidad de León, Av. de Portugal 41, 24071 León, Spain
| | - A Morán
- Chemical and Environmental Bioprocess Engineering Department, Natural Resources Institute (IRENA), Universidad de León, Av. de Portugal 41, 24071 León, Spain
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Fernández-Cabana M, García-Caballero A, Alves-Pérez MT, García-García MJ, Mateos R. Suicidal traits in Marilyn Monroe's Fragments: an LIWC analysis. Crisis 2014; 34:124-30. [PMID: 23261910 DOI: 10.1027/0227-5910/a000183] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Linguistic inquiry and word count (LIWC), a computerized method for text analysis, is often used to examine suicide writings in order to characterize the quantitative linguistic features of suicidal texts. AIMS To analyze texts compiled in Marilyn Monroe's Fragments using LIWC, in order to explore the use of different linguistic categories in her narrative over the years. METHOD Selected texts were grouped into four periods of similar word count and processed with LIWC. Spearman's rank correlation was used to assess changes in language use across the documents over time. The Kruskal-Wallis test was applied to compare means between periods and for each of the 80 LIWC output scores. RESULTS Significant differences (p < .05) were found in 11 categories, the most relevant being a progressive decrease in the use of negative emotion words, a reduction in the use of long words in the third period, and an increase in the proportion of personal pronouns used as Monroe approached the time of her death. CONCLUSIONS The consistently elevated usage of first-person personal singular pronouns and the consistently diminished usage of first-person personal plural pronouns are in line with previous studies linking this pattern with a low level of social integration, which has been related to suicide according to different theories.
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Garcia-Caballero A, Fernández-Cabana M, Alves M, García M, Mateos R. P-1418 - Looking for suicidal traits in marilyn monroe's “fragments”. a LIWC analysis. Eur Psychiatry 2012. [DOI: 10.1016/s0924-9338(12)75585-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Madrona A, Pereira-Caro G, Bravo L, Mateos R, Espartero J. Preparation and antioxidant activity of tyrosyl and homovanillyl ethers. Food Chem 2011; 129:1169-78. [DOI: 10.1016/j.foodchem.2011.05.098] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 03/29/2011] [Accepted: 05/20/2011] [Indexed: 02/02/2023]
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Virués-Ortega J, de Pedro-Cuesta J, Vega S, Seijo-Martínez M, Saz P, Rodríguez F, Rodríguez-Laso A, Reñé R, de Las Heras SP, Mateos R, Martínez-Martín P, Mahillo-Fernández I, López-Pousa S, Lobo A, Reglà JL, Gascón J, García FJ, Fernández-Martínez M, Boix R, Bermejo-Pareja F, Bergareche A, Sánchez-Sánchez F, de Arce A, del Barrio JL. Prevalence and European comparison of dementia in a ≥75-year-old composite population in Spain. Acta Neurol Scand 2011; 123:316-24. [PMID: 20636450 DOI: 10.1111/j.1600-0404.2010.01398.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVES To estimate dementia prevalence in Spain. MATERIALS AND METHODS Nine probabilistic and geographically defined samples participated. A screening design based on the MMSE was implemented. Positively screened individuals underwent clinical evaluation. The total number of cases in Spain was estimated. Prevalence was confronted to that of other European countries. RESULTS Five hundred and forty-six persons aged ≥75 participated, 49 had dementia (35 with Alzheimer's disease [AD], 10 with vascular dementia [VD], 4 other; 25 first diagnosed in the study). Age- and sex-adjusted prevalence and estimated nationwide cases were 7.5% (95% CI 5.4-9.7), 5.6 (95% CI 3.7-7.5) and 1.4 (95% CI 0.5-2.3), and 290,000 (95% CI 208,000-372,000), 214,000 (95% CI 141,000-288,000) and 54,000 (95% CI 20,000-88,000) for dementia, AD and VD, respectively. CONCLUSIONS Dementia prevalence in Spain is comparable to other European populations, while a high number of undiagnosed cases live in the community. The potential impact of Mediterranean diet, hypertension control and decreasing vascular risk factors is discussed.
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Affiliation(s)
- J Virués-Ortega
- National Centre for Epidemiology, Research Network in Nerodegenerative Disease, Carlos III Institute of Health, Madrid, Spain.
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Mateos R, Pereira-Caro G, Saha S, Cert R, Redondo-Horcajo M, Bravo L, Kroon P. Acetylation of hydroxytyrosol enhances its transport across differentiated Caco-2 cell monolayers. Food Chem 2011. [DOI: 10.1016/j.foodchem.2010.09.054] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Castro-Costa E, Dewey M, Stewart R, Banerjee S, Huppert F, Mendonca-Lima C, Bula C, Reisches F, Wancata J, Ritchie K, Tsolaki M, Mateos R, Prince M. Prevalence of depressive symptoms and syndromes in later life in ten European countries: the SHARE study. Br J Psychiatry 2007; 191:393-401. [PMID: 17978318 DOI: 10.1192/bjp.bp.107.036772] [Citation(s) in RCA: 160] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND The EURO-D, a12-item self-report questionnaire for depression, was developed with the aim of facilitating cross-cultural research into late-life depression in Europe. AIMS To describe the national variation in depression symptoms and syndrome prevalence across ten European countries. METHOD The EURO-D was administered to cross-sectional nationally representative samples of non-institutionalised persons aged > or =50 years (n=22 777). The effects of age, gender, education and cognitive functioning on individual symptoms and EURO-D factor scores were estimated. Country-specific depression prevalence rates and mean factor scores were re-estimated, adjusted for these compositional effects. RESULTS The prevalence of all symptoms was higher in the Latin ethno-lingual group of countries, especially symptoms related to motivation. Women scored higher on affective suffering; older people and those with impaired verbal fluency scored higher on motivation. CONCLUSIONS The prevalence of individual EURO-D symptoms and of probable depression (cut-off score > or =4) varied consistently between countries. Standardising for effects of age, gender, education and cognitive function suggested that these compositional factors did not account for the observed variation.
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Affiliation(s)
- E Castro-Costa
- Section of Epidemiology, Institute of Psychiatry, King's College London, De Crespigny Park, London, UK.
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Olmedo E, Valderas J, Mateos R, Gimeno R. Utilización de redes neuronales en la caracterización, modelación y predicción de series temporales económicas en un entorno complejo. Int Artif 2007. [DOI: 10.4114/ia.v8i23.789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Mateos R, Puime M. Care needs of functional psychotic patients in late life. the situation of elderly patients at psychiatric hospitals versus nursing homes. Eur Psychiatry 2007. [DOI: 10.1016/j.eurpsy.2007.01.218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Lecumberri E, Mateos R, Ramos S, Alía M, Rúperez P, Goya L, Izquierdo-Pulido M, Bravo L. [Characterization of cocoa fiber and its effect on the antioxidant capacity of serum in rats]. NUTR HOSP 2006; 21:622-8. [PMID: 17044609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023] Open
Abstract
OBJECTIVES The aim of this study was to characterize the physico-chemical properties of cocoa fibre (CF), to analyze its polyphenolic content and antioxidant capacity in vitro, and to investigate the effect of the administration of a polyphenolic extract of this cocoa fiber on the antioxidant capacity of the serum in rats. METHODS AND MATERIALS Dietary fiber (DF) composition and polyphenolic (PP) content of the cocoa fiber were analyzed. The antioxidant capacity of the CF was determined by means of its reduction power (FRAP) and the capacity to scavenge free radicals (ABTS). To evaluate the bioavailability and the antioxidant capacity in vivo of the phenolic compounds of CF, an extract of these compounds was administred in the stomach of the rats with a gastric probe (100 mg PP/kg), taking blood samples at different time intervals. Sera were analyzed by HPLC to determine the presence/absence of PP or PP-metabolites. In orther to evaluate the antioxidant capacity of the serum FRAP and ABTS methods were used. RESULTS Cocoa fiber was an excellent source of DF, with a high content of total dietary fiber (TDF), over 60% of the dry matter, made up mainly of insoluble dietary fiber (IDF; 83% of TDF). This fiber had just 1.15% of polyphenols, with low antioxidant activity. After intragastric administration of the PP-rich fraction a fast and measurable absorption of the CF polyphenols was observed, being epicatechin the main PP in blood. The absorption of this PP confers a significant, although transitory increase of the serum antioxidant capacity 10-45 minutes post-gavage; after this time, the antioxidant capacity progressively decreased reaching basal levels after 6 h. CONCLUSIONS Cocoa fiber can be considered as an excellent source of DF, mainly insoluble dietary fiber; therefore, it could be used as an ingredient in fiber-rich functional foods. Besides the benefits derived from its high fiber content, the CF would provide protection against oxidative damage by means of its content in phenolic compounds (epicatechin) wich are absorbed maintaining the antioxidant properties in vivo.
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Affiliation(s)
- E Lecumberri
- Instituto del Frío (CSIC), Departamento de Metabolismo y Nutrición, Madrid, España
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Carrazán S, Mateos R, Rives V, Ruiz P. Influence of the solid state properties of Pd/MOx (M=Ti, Al) catalysts in catalytic combustion of methane. Catal Today 2006. [DOI: 10.1016/j.cattod.2005.11.049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
A procedure for the simultaneous determination of long-chain aliphatic aldehydes, and aliphatic and triterpenic waxes in virgin olive oils is described. A fraction containing these compounds was isolated from the oil using solid-phase extraction on silica-gel cartridges. The fraction was analyzed by capillary GC on 35%-dimethyl-65%-diphenylpolysiloxane phase using on-column injection. In extra virgin olive oils, the long-chain aliphatic aldehydes with even carbon atom numbers from C22 to C30 were identified by comparison of retention times and mass spectra with those of synthesized standards. The concentration of total aldehydes ranged from 20.2 to 108.0 mg/kg-n-hexacosanal being the most abundant aldehyde. The determination of aliphatic waxes was achieved with similar or better precision than that of the EU official methods.
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Affiliation(s)
- M C Pérez-Camino
- Instituto de la Grasa (CSIC), Avda Padre Garcia Tejero, 4 41012 Sevilla, Spain
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García JM, Yousfi K, Mateos R, Olmo M, Cert A. Reduction of oil bitterness by heating of olive (Olea europaea) fruits. J Agric Food Chem 2001; 49:4231-4235. [PMID: 11559116 DOI: 10.1021/jf001302n] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Olives (Olea europaea) of the Manzanilla and Verdial varieties, harvested at the green mature stage of ripening, were heated at 30, 40, 45, and 50 degrees C during 24 h and at 40 degrees C during 24, 48, and 72 h, respectively. Just after treatments, oils were physically extracted from the olives. Olive heating promotes a reduction of oil bitterness in direct relationship to the time and temperature used. Fruit heating at < or =40 degrees C during 24 h did not produce significant changes of acidity, UV absorption, peroxide index, panel test score, or oxidative stability of the obtained oils. Both longer treatments at 40 degrees C and heating at >40 degrees C yielded oils with less oxidative stability. Oils obtained from olives heated at > or =40 degrees C showed higher concentrations of chlorophylls and carotenes. For each olive variety, a good correlation between oil bitterness and content of hydroxytyrosol secoiridoid derivatives was found.
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Affiliation(s)
- J M García
- Instituto de la Grasa (CSIC), Departamento de Fisiología y Tecnología de Productos Vegetales, Avenida Padre García Tejero 4, 41012 Sevilla, Spain.
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Mateos R, Espartero JL, Trujillo M, Ríos JJ, León-Camacho M, Alcudia F, Cert A. Determination of phenols, flavones, and lignans in virgin olive oils by solid-phase extraction and high-performance liquid chromatography with diode array ultraviolet detection. J Agric Food Chem 2001; 49:2185-92. [PMID: 11368575 DOI: 10.1021/jf0013205] [Citation(s) in RCA: 340] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A simple analytical method for the quantitative determination of phenols, flavones, and lignans in virgin olive oils was developed. The polar fraction was isolated from small amounts of oil sample (2.5 g) by solid-phase extraction (SPE) using diol-phase cartridges, and the extract was analyzed by reversed-phase HPLC coupled with diode array UV detection. Chromatographic separation of pinoresinol, cinnamic acid, and 1-acetoxypinoresinol was achieved. Repeatability (RSD < 6.5%), recovery (> 90%), and response factors for each identified component were determined. SPE on amino-phase cartridges was used for isolating acidic phenols and as an aid for phenol identification. For the first time, 2-(4-hydroxyphenyl)ethyl acetate was detected in olive oils. The aldehydic structure of the ligstroside aglycon was confirmed by NMR spectroscopy. The colorimetric determination of total o-diphenolic compounds by reaction with molybdate was consistent with their HPLC determination. Differences between results obtained by liquid-liquid extraction and SPE were not statistically significant.
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Affiliation(s)
- R Mateos
- Instituto de la Grasa (CSIC), Avenida Padre García Tejero 4, E-41012, Sevilla, Spain
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Moreno S, Ariza J, Espinosa FJ, Podzamczer D, Miró JM, Rivero A, Rodríguez-Zapata M, Arrizabalaga J, Mateos R, Herrero F. Brucellosis in patients infected with the human immunodeficiency virus. Eur J Clin Microbiol Infect Dis 1998; 17:319-26. [PMID: 9721960 DOI: 10.1007/bf01709454] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Brucellosis has been described rarely in patients infected with HIV, despite the fact that eradication of intracellular brucellae is largely dependent on cell-mediated immunity. The characteristics of all patients with HIV infection and brucellosis seen in seven Spanish hospitals are reported. Since the beginning of the AIDS epidemic, 12 HIV-infected patients were diagnosed with brucellosis (8 with cultures positive for Brucella spp., 4 with high anti-Brucella antibody titers). Most patients were male and intravenous drug users. Eleven patients had no symptoms of HIV infection when first diagnosed with brucellosis and had relatively preserved cellular immunity (median CD4 + cell count 588, range 136-1006). There was a clear epidemiologic antecedent for acquisition of brucellosis in 11 patients. Clinical symptoms included fever, arthromyalgia, and sweating in all patients; four patients presented with focal disease. All patients had high agglutinin titers, and eight of nine had cultures positive for Brucella. Therapy with doxycycline and streptomycin was curative in all cases. Two patients experienced a recurrence of symptoms after initial treatment, although no microbiological relapses were documented after a median follow-up period of 18 months. HIV infection does not seem to increase the incidence of brucellosis. Since most cases occur in asymptomatic patients with relatively preserved immunity, the epidemiology, clinical presentation, diagnosis, response to therapy, and outcome are similar to those observed in non-HIV infected patients.
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Affiliation(s)
- S Moreno
- Department of Clinical Microbiology, Hospital General Universitario J.Ma Morales Meseguer, Murcia, Spain
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