Search results for: M.A. Lage Yusty

Items from 1 to 20 out of 22 results

article

Comparison of methods for analysis of resveratrol in dietary vegetable supplements

E. Moretón-Lamas, M. Lago-Crespo, M.A. Lage-Yusty, J. López-Hernández

Food Chemistry > 2017 > 224 > C > 219-223

Resveratrol is a stilbene, which is one of a group of polyphenols in many plant foods. Interest in this substance lies in its potential health benefits. This study aimed to compare two different methods, chromatographic and constant-wavelength synchronous spectrofluorimetry, an alternative technique to determine the amount of resveratrol dietary supplements, as a model for more complex foods. High-performance...

article

An evaluation of edible red seaweed (Chondrus crispus) components and their modification during the cooking process

A.L. Pina, A.R. Costa, M.A. Lage-Yusty, J. López-Hernández

LWT - Food Science and Technology > 2014 > 56 > 1 > 175-180

In this study, phycobiliproteins, carotenoids (β-carotene and lutein), volatile compounds and antioxidant activity were determined in dried, hydrated, boiled and steamed Chondrus crispus seaweed.Significant changes in phycoerythrin, phycocyanin, β-carotene, lutein, volatile compounds and antioxidant activity have been observed after different culinary treatments (hydration, boiling and steaming)....

article

Determination of phenolic compounds in macroalgae for human consumption

A. Rodríguez-Bernaldo de Quirós, M.A. Lage-Yusty, J. López-Hernández

Food Chemistry > 2010 > 121 > 2 > 634-638

In the present study, a reversed-phase liquid chromatographic method to analyse polyphenols in red and brown macroalgae for human consumption is presented. Different parameters that influence the extraction procedure such as solvent volume and composition, extraction time and temperature and sample amount were optimised. In addition three homogenisation systems (ultrasonic bath, magnetic stirring...

article

HPLC-analysis of polyphenolic compounds in Spanish white wines and determination of their antioxidant activity by radical scavenging assay

A. Rodríguez-Bernaldo de Quirós, M.A. Lage-Yusty, J. López-Hernández

Food Research International > 2009 > 42 > 8 > 1018-1022

A high-performance liquid chromatographic method coupled with UV and fluorescence detectors for the determination of polyphenols in white wines samples is reported. The proposed method was validated regarding linearity, repeatabilities within day and between days, recoveries and polyphenol stabilities.Eleven phenolic compounds including, flavanols and flavanols dimmers (procyanidins), hydroxycinnamates,...

article

HPLC analysis of organic acids using a novel stationary phase

A. Rodríguez-Bernaldo de Quirós, M.A. Lage-Yusty, J. López-Hernández

Talanta > 2009 > 78 > 2 > 643-646

In the present work, a high performance liquid chromatographic method with UV detection for the separation of six organic acids including, tartaric, malic, acetic, lactic, citric and succinic is described.The separation was performed on a novel stationary phase TEKNOKROMA, Tr-010065 Mediterranea sea ₁₈ (15cm×0.4cm, i.d. 3μm) and using water with a 0.1% (v/v) of formic acid as mobile phase...

article

Comparison of two stationary phases for the separation of five selected polyphenols

A. Rodríguez-Bernaldo de Quirós, M.A. Lage-Yusty, J. López-Hernández

Talanta > 2008 > 77 > 1 > 98-102

In this study, a conventional TEKNOKROMA, Tr-015605 TRACER EXTRASIL ODS2 (25cm×0.4cm, i.d. 5μm) column and a new stationary phase TEKNOKROMA, Tr-010065 Mediterranea sea ₁₈ (15cm×0.4cm, i.d. 3μm) were compared for the separation of five phenolic compounds.Sensitivity, performance characteristics, analysis time and method validation were reported for both columns. A better sensitivity and performance...

article

Comparison of supercritical fluid extraction and Soxhlet extraction for the determination of aliphatic hydrocarbons in seaweed samples

M.O. Punín Crespo, M.A. Lage Yusty

Ecotoxicology and Environmental Safety > 2006 > 64 > 3 > 400-405

Supercritical fluid extraction (SFE) and Soxhlet extraction methods were compared in a study of the aliphatic hydrocarbon profiles of seaweed samples. Method precision for Soxhlet extraction (⩽7.58%) was slightly better than that for SFE (⩽9.28%) except for C ₂₈ . The SFE method is a good alternative for the routine determination of alkanes in seaweed samples; however, for a complete study...

article

High-performance liquid chromatographic determination of chitin in the snow crab, Chionoecetes opilio

M.O. Punín Crespo, M. Vilasoa Martínez, J. López Hernández, M.A. Lage Yusty

Journal of Chromatography A > 2006 > 1116 > 1-2 > 189-192

A HPLC method was developed for the determination of glucosamine in crab shells. The amount of glucosamine residue can be used to estimate the amount of chitin in analyzed material. Crab samples were hydrolysed with 6M HCl at 100°C for 13h and the released glucosamine was determined by HPLC using refractive index (RI) detection. Separations were performed using an ODS-2 column with an isocratic mobile...

article

Comparison of supercritical fluid extraction and Soxhlet extraction for the determination of PCBs in seaweed samples

M.O. Punín Crespo, M.A. Lage Yusty

Chemosphere > 2005 > 59 > 10 > 1407-1413

The efficiency of supercritical fluid extraction for the determination of 12 polychlorinated biphenyls from algae samples is compared to Soxhlet extraction.Analytical detection limits for the individual congeners ranged from 0.62μgl ⁻¹ to 19μgl ⁻¹ .Recovery was tested for both methods using standard addition procedure. At maximum spike level of concentration, the mean recoveries were...

article

Supercritical fluid extraction and high-performance liquid chromatography-fluorescence detection method for polycyclic aromatic hydrocarbons investigation in vegetable oil

M.A. Lage Yusty, J.L. Cortizo Daviña

Food Control > 2005 > 16 > 1 > 59-64

In spite of the fact that food processes, that involve drying and smoking, may cause polycyclic aromatic hydrocarbon contamination, an extraction clean/up procedure carried out by SFE was developed in order to isolate polycyclic aromatic hydrocarbons from oil vegetable samples for subsequent HPLC-FL determination. The detection and quantification limits obtained were <1.55 μgkg ^- ¹ ...

article

Determination of folates in seaweeds by high-performance liquid chromatography

A. Rodrı́guez-Bernaldo de Quirós, C. Castro de Ron, J. López-Hernández, M.A. Lage-Yusty

Journal of Chromatography A > 2004 > 1032 > 1-2 > 135-139

A reversed-phase high-performance liquid chromatography (HPLC) method, with a combination of fluorescence and ultraviolet detectors, to determine the folate forms present in commercial macroalgae products form northwest Spain as part of nutritional studies in dehydrated and canned seaweeds is reported. The method includes extraction of folates from seaweed by heat treatment, deconjugation of folate...

article

Determination of aliphatic hydrocarbons in the alga Himanthalia elongata

M.O. Punı́n Crespo, M.A. Lage Yusty

Ecotoxicology and Environmental Safety > 2004 > 57 > 2 > 226-230

The algae considered new foods according to Regulation CE 258/97 need a guarantee of their healthfulness before being in the European market. In this work ten samples of the brown alga Himanthalia elongata have been analyzed with the aim of verifying the absence of aliphatic hydrocarbons, due to the ability of the macroalgae to capture lipophilic organic compounds of the marine water coming from accidental...

article

Aliphatic Hydrocarbons in Birds of Prey from Galicia (NW Spain)

T.J. López y López-Leitón, M.E. Alvarez Piñeiro, M.A. Lage Yusty, J. Simal Lozano

Ecotoxicology and Environmental Safety > 2001 > 50 > 1 > 44-47

Eleven aliphatic hydrocarbons, unresolved over resolved ratio (U/R), carbon preference index (CPI), pristane/C17 ratio, and totals were determined in six classes of tissues (heart, liver, intestine, muscle, lung, and kidney) of 10 buzzards (Buteo buteo), 10 barn owls (Tyto alba), and five tawny owls (Strix aluco) from Galicia (NW Spain). Among individuals detected at quantifiable levels, in general,...

article

Enrichment of benzo[a]pyrene in vegetable oils and determination by HPLC-FL

S. Vazquez Troche, M.S. Garcı́a Falcón, S. González Amigo, M.A. Lage Yusty, more

Talanta > 2000 > 51 > 6 > 1069 - 1076

We have developed a simple method for the determination of the carcinogen Benzo[a]pyrene (BP) in vegetable oils. The method consists of extraction of the vegetable oil in acetonitrile, concentration to dryness in rotary evaporator and redissolution of the residue in hexane. The purification of the hexane extract was on Sep-Pack Silica Plus cartridges, and the determination of the BP in the isolated...

article

Organochlorine Pesticides in Wolves from Galicia

S.T. Carril González-Barros, M.E. Alvarez Piñeiro, J.Simal Lozano, M.A. Lage Yusty

Ecotoxicology and Environmental Safety > 2000 > 45 > 3 > 247-252

Levels of seven organochlorine pesticides (heptachlorepoxide, dieldrin, endrin, p,p′-DDE, o-p′-DDT, p,p′-DDT, and methoxychlor) and DDE/DDT ratios were determined in spleen, liver, muscle, kidney and suprarenal from 12 wolves from three provinces of Galicia (eight male and four female). Analysis was carried out by GC-ECD. Heptachlorepoxide was in found only 25% of samples, while p,p′-DDE was the most...

article

Aliphatic hydrocarbons in wolf tissue samples from galicia (N.W. Spain)

S.T. Carril González-Barros, M.E. Alvarez Piñeiro, J. Simal Lozano, M.A. Lage Yusty

Chemosphere > 1998 > 36 > 3 > 597-602

We have investigated the levels of aliphatic hydrocarbons, UCM and CPI in wolves from Galicia (Spain). The n-alkanes distribution was characterized by a predominance of even carbon n-alkanes. Suprarenal and muscle tissues contained more aliphatic hydrocarbons (AHs) than spleen, liver or kidney. The AHs which were detected were found most frequently in adults and males.The mean concentrations of...

article

PCBs and PCTs in wolves (Canis lupus, L) in Galicia (N.W. Spain)

S.T. Carril González-Barros, M.E. Alvarez Piñeiro, J. Simal Lozano, M.A. Lage Yusty

Chemosphere > 1997 > 35 > 6 > 1243-1247

Levels of PCBs and PCTs (the Aroclor ₁ ₂ ₆ ₀ and Aroclor ₅ ₄ ₆ ₀ congeners, respectively) in viscera of wolves of Galicia (N.W. Spain) were determined by capillary GC with electron-capture detection. Mean PCB levels ranged from 0.13 mg/kg of dry tissue in kidney to 3.70 mg/kg in liver. PCTs were detected only in suprarenal capsule, their mean level being 3...

article

Aliphatic hydrocarbon levels in turbot and salmon farmed close to the site of the Aegean Sea oil spill

M.E. Alvarez Pineiro, M.A. Lage Yusty, S.T. Carril Gonzalez-Barros, J. Simal Lozano

Oceanographic Literature Review > 1997 > 44 > 6 > 640

Variations over time of aliphatic hydrocarbon levels in turbot and Atlantic salmon sampled from fish farms close to the site of the Aegean Sea oil spill were investigated. Aliphatic hydrocarbons were identified on the basis of both absolute retention time and relative retention time. Organoleptic properties were also evaluated. The concentration of hydrocarbons in turbot collected during the month...

article

Enrichment of benzo[a]pyrene in smoked food products and determination by high-performance liquid chromatography-fluorescence detection

M.S. García Falcón, S. González Amigo, M.A. Lage Yusty, M.J. López de Alda Villaizán, more

Journal of Chromatography A > 1996 > 753 > 2 > 207-215

We developed a procedure for trace enrichment of benzo[a]pyrene (BP) in extracts of smoked food products, and an HPLC-fluorescence detection (FL) method for determination of BP in the enriched extracts. The procedure consists in extraction/sonication of the lyophilized product in hexane, clean-up of the hexane extract by passage through a Sep-Pak Silica Plus cartridge and, subsequently, by partitioning...

article

Second-derivative constant-wavelength synchronous scan spectrofluorimetry for determination of benzo[b]fluoranthene, benzo[a]pyrene and indeno[1,2,3-cd]pyrene in drinking water

M.J. López de Alda Villaizán, M.S. García Falcón, S. González Amigo, J. Simal Lozano, more

Talanta > 1996 > 43 > 9 > 1405-1412

The use of derivative constant-wavelength synchronous scan fluorimetry is reported for the determination of three polycyclic aromatic hydrocarbon pollutants in drinking water (linearity range 0.4-4 μg l ^- ¹ ). The limits of detection (LD) and quantification (LQ) (μg l ^- ¹ ) are 0.01 and 0.07 for benzo[b]fluoranthene, 0.03 and 0.12 for benzo[a]pyrene and 0.19 and 0.57 for indeno[1,2,3-cd]pyrene...

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Search results for: M.A. Lage Yusty

Comparison of methods for analysis of resveratrol in dietary vegetable supplements

An evaluation of edible red seaweed (Chondrus crispus) components and their modification during the cooking process

Determination of phenolic compounds in macroalgae for human consumption

HPLC-analysis of polyphenolic compounds in Spanish white wines and determination of their antioxidant activity by radical scavenging assay

HPLC analysis of organic acids using a novel stationary phase

Comparison of two stationary phases for the separation of five selected polyphenols

Comparison of supercritical fluid extraction and Soxhlet extraction for the determination of aliphatic hydrocarbons in seaweed samples

High-performance liquid chromatographic determination of chitin in the snow crab, Chionoecetes opilio

Comparison of supercritical fluid extraction and Soxhlet extraction for the determination of PCBs in seaweed samples

Supercritical fluid extraction and high-performance liquid chromatography-fluorescence detection method for polycyclic aromatic hydrocarbons investigation in vegetable oil

Determination of folates in seaweeds by high-performance liquid chromatography

Determination of aliphatic hydrocarbons in the alga Himanthalia elongata

Aliphatic Hydrocarbons in Birds of Prey from Galicia (NW Spain)

Enrichment of benzo[a]pyrene in vegetable oils and determination by HPLC-FL

Organochlorine Pesticides in Wolves from Galicia

Aliphatic hydrocarbons in wolf tissue samples from galicia (N.W. Spain)

PCBs and PCTs in wolves (Canis lupus, L) in Galicia (N.W. Spain)

Aliphatic hydrocarbon levels in turbot and salmon farmed close to the site of the Aegean Sea oil spill

Enrichment of benzo[a]pyrene in smoked food products and determination by high-performance liquid chromatography-fluorescence detection

Second-derivative constant-wavelength synchronous scan spectrofluorimetry for determination of benzo[b]fluoranthene, benzo[a]pyrene and indeno[1,2,3-cd]pyrene in drinking water

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