Maria Luisa Lorenzo
University of Granada
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Maria Luisa Lorenzo.
Science of The Total Environment | 2001
E Lendinez; Maria Luisa Lorenzo; Carmen Cabrera; M.C. López
In the present study, graphite furnace atomic absorption spectrometry (GFAAS) was used to determine the content of total chromium in some basic foods of the Spanish diet. The seafood samples, vegetables and olive oils were mineralized previously with HNO3 and V2O5. A procedure of slurries with Triton X-100 was applied to dairy products. The temperature-time program was optimized for every type of sample. An assessment of the analytical characteristics of the method verifies their reliability. The content of Cr ranged between 0.004 and 0.079 microg/g in seafood (fresh wt.), from 0.007 to 0.456 microg/g in cereals and vegetables (fresh wt.), between not detectable and 0.625 microg/g in dairy products and between not detectable and 0.040 microg/g in olive oils. The high consumption of these products conditions the fact that they should be significant sources of Cr in the diet.
International Journal of Food Sciences and Nutrition | 2013
Ana Rivas; Antonio Romero; M. Mariscal-Arcas; Celia Monteagudo; Belén Feriche; Maria Luisa Lorenzo; Fatima Olea
We hypothesized that adherence to the Mediterranean diet measured as a Mediterranean diet score (MDS) has a beneficial effect on bone mineral density (BMD). For the purposes of this study, a sample of healthy women from Southern Spain was chosen. Subjects were grouped into two major groups: a first group consisted of women of reproductive age (premenopausal, pre-M) and a second group consisted of postmenopausal women (pos-M). The consumption of vegetables and fruit was found to be significantly related to BMD in both groups of subjects studied. In the pre-M group, the lipid ratio was positively associated with BMD and in pos-M women nuts intake was also associated with BMD. After implementing the analysis of covariance analysis, significant linear trends between the MDS and BMD were observed in all subjects studied. Our results indicate that a varied diet based on Mediterranean diet patterns may be beneficial in the prevention of osteoporosis.
Science of The Total Environment | 2000
Elena M. Garciá; Carmen Cabrera; Maria Luisa Lorenzo; M.C. López
We determined the presence of chromium in a total of 72 samples of 17 different spices and aromatic herbs. Electrothermal atomization atomic absorption spectrometry (ETA-AAS) was used to determine Cr content in the samples mineralized with HNO3 and V2O5. The analytical characteristics of the proposed method were tested, and the accuracy and precision was also verified against an NBS-certified reference material. Chromium concentrations ranged from not detectable to 1.42 micrograms/g (dry wt.) and Cr presence was detected in 95% of samples. Spices and aromatic herbs are widely consumed in the Spanish diet and in the Mediterranean diet, in general.
Science of The Total Environment | 1999
Elena M. Garciá; Carmen Cabrera; J. Sánchez; Maria Luisa Lorenzo; M.C. López
Potable water, fruit juices and soft drinks are some of the most widespread beverages in the habitual diet, and they can contribute to chromium dietary intake. We determined the concentration of chromium in 90 different samples of beverages widely consumed in Spain. Graphite furnace atomic absorption spectrometry was used to analyze samples processed with a HNO3-V2O5 acid digestion pretreatment. In water samples Cr was directly determined. We verified the sensitivity, accuracy and precision of the method and ruled out matrix interferences. In analyzed samples, chromium values ranged from not detectable to 11.80 micrograms/l in potable water, from not detectable to 17.60 micrograms/l in fruit juices and from 3.60 to 60.50 micrograms/l in soft drinks. The chromium levels we encountered are low and the contribution of non-alcoholic beverages to dietary intake of this element, have been estimated to be 0.41 microgram/day in the common Spanish diet.
Science of The Total Environment | 1996
C. Mena; Carmen Cabrera; Maria Luisa Lorenzo; M.C. López
An accurate and precise method is described for the direct determination of Cd in wine, beer and other alcoholic beverages by electrothermal atomization-atomic absorption spectrometry (ETA-AAS). The graphite furnace program was optimized and samples were pretreated with nitric acid and pentoxide vanadium in a digestion block at 120 degrees C for 90 min. The results obtained were validated against microwave acid sample digestion. The analytical detection limit was 0.5 pg. The proposed method was applied to determine Cd in 134 samples of 10 different alcoholic beverages. The mean values ranged from 0.10 to 15.38 microg/l in wine, from not detectable to 0.80 microg/l in beer, and from not detectable to 11.52 microg/l in other alcoholic beverages such as cider, brandy, rum, whisky, gin, anisette, liquor and spirits. The wide variability of the results obtained emphasizes the multiplicity of factors that can influence the presence of Cd in these products. Because alcoholic beverages are widely consumed, they contribute a large fraction of cadmium intake, and therefore, strict control of this element is advisable.
International Journal of Food Sciences and Nutrition | 1996
C. Cabrera; Maria Luisa Lorenzo; C. De Mena; M. C. Lopez
Because milk and dairy products are some of the most widespread foods in the human diet, they contribute a large fraction of mineral intake. We determined levels of chromium, copper, iron, manganese, selenium and zinc in 60 samples of 10 widely consumed dairy products. Graphite furnace atomic absorption spectrometry was used to analyze samples processed with a slurry procedure to minimize sample pretreatment. The accuracy and precision of our method were verified. In analyzed samples, mean values ranged from not detectable to 0.950 microgram/g for Cr, from 0.020 to 2.800 micrograms/g for Cu, from 0.750 to 20.0 micrograms/g for Fe, from 0.010 to 0.900 microgram/g for Mn, from not detectable to 0.140 microgram/g for Se, and from 0.250 to 4.500 micrograms/g for Zn. The highest levels of Cr, Cu, Fe, Mn and Zn were detected in childrens milk. Increased concentrations of Cr, Cu, Fe and Mn were detected in products packaged in glazed ceramic containers. We also studied the absorbable fractions of these elements using in vitro techniques which simulate human gastric and intestinal digestion.
Science of The Total Environment | 2000
Francisco F. López; Carmen Cabrera; Maria Luisa Lorenzo; M.C. López
We evaluated the levels of aluminium in a total of 72 samples of 17 different spices and aromatic herbs that are widely consumed in Spain, and in the Mediterranean diet, in general. Aluminium was determined in the samples mineralized with HNO3 and V2O5, using electrothermal atomization atomic absorption spectroscopy as the analytical technique. The accuracy and precision of the proposed method was verified against an NBS-certified reference material. Precision, expressed as relative standard deviation, ranged from 1.10 to 4.07%. The results obtained from recovery studies were of 97.90 +/- 1.20. Aluminium concentrations ranged from 3.74 to 56.50 microg/g (dry wt.). The presence of this metal was detected in all the samples we analysed.
Nutricion Hospitalaria | 2012
Ana Rivas; A. Romero; M. Mariscal-Arcas; Celia Monteagudo; G. López; Maria Luisa Lorenzo; Francisco M. Ocaña-Peinado; F. Olea-Serrano
BACKGROUND Several lines of evidence suggest a tight association between oxidative stress and the pathogenesis of osteoporosis in humans. The intake of antioxidants may influence Bone Mineral Density by acting as free radical scavengers, preventing oxidation-induced damage to bone cells. OBJECTIVE The aim of this study was to assess the association between the Dietary Antioxidant Quality Score and bone mineral density in a sample of healthy women. METHODS A total of 280 women were grouped into three major groups: women aged ≤ 35 years; women aged 36-45, and finally women aged >45 years. Calcaneous Bone Mineral Density (g/cm²) was measured by dual energy X-ray absorptiometry. Data on the eating habits of each participant were collected with a structured 24-hour diet recall questionnaire. A Dietary Antioxidant Quality Score was used to calculate antioxidant-nutrient intake. RESULTS A significant and positive association was observed among Bone Mineral Density and dietary intake of vitamin C and selenium. Zinc intake was significantly related to Bone Mineral Density in the youngest group. Low antioxidant consumers were considered individuals whose Dietary Antioxidant Quality Score was lower or equal than the median (3.5), and high antioxidant consumers were those whose Dietary Antioxidant Quality Score were higher than 3.5. Bone Mineral Density was higher in the participants defined as high antioxidant consumers in all aged groups. CONCLUSION The study showed that there is an association between Bone Mineral Density and the Dietary Antioxidant Quality Score in all the women studied. Therefore, new therapies for osteoporosis based on higher dietary antioxidant intakes might be developed basing on the results obtained in this study.
Science of The Total Environment | 1994
Carmen Cabrera; E. Ortega; C. Gallego; M.C. López; Maria Luisa Lorenzo; C. Asensio
Abstract We determined levels of cadmium contamination in farmland soils and in sewage sludge, obtained from nearby outlets and used as a fertilizer, in a coastal region of southern Spain (Province of Granada). Electrothermal atomization atomic absorption spectrometry was used to analyze the samples processed with acid digestion. The accuracy and precision of our method was verified against an NBS-certified reference material. Concentrations of Cd ranged from 0.48 to 1.88 μg g−1 in the soil, and from 0.60 to 1.64 μg g−1 in the sewage sludge. We also studied the influence of other possible sources of contamination and the repercussions of Cd levels on food and feed crops in this region.
PLOS ONE | 2016
Olga García-Martínez; Elvira De Luna-Bertos; Javier Ramos-Torrecillas; Concepción Ruiz; Egle Milia; Maria Luisa Lorenzo; Brigida Jimenez; Araceli Sánchez-Ortiz; Ana Rivas
In this study, we aimed to clarify the effects of phenolic compounds and extracts from different extra virgin olive oil (EVOO) varieties obtained from fruits of different ripening stages on osteoblast cells (MG-63) proliferation. Cell proliferation was increased by hydroxytyrosol, luteolin, apigenin, p-coumaric, caffeic, and ferulic acids by approximately 11–16%, as compared with controls that were treated with one vehicle alone, while (+)-pinoresinol, oleuropein, sinapic, vanillic acid and derivative (vanillin) did not affect cell proliferation. All phenolic extracts stimulated MG-63 cell growth, and they induced higher cell proliferation rates than individual compounds. The most effective EVOO phenolic extracts were those obtained from the Picual variety, as they significantly increased cell proliferation by 18–22%. Conversely, Arbequina phenolic extracts increased cell proliferation by 9–13%. A decline in osteoblast proliferation was observed in oils obtained from olive fruits collected at the end of the harvest period, as their total phenolic content decreases at this late stage. Further research on the signaling pathways of olive oil phenolic compounds involved in the processes and their metabolism should be carried out to develop new interventions and adjuvant therapies using EVOO for bone health (i.e.osteoporosis) in adulthood and the elderly.