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De Alda-Villaizan MJL, García-Falcon S, Lage-Yusty MA, Simal-Lozano J. Synchronous Spectrofluorimetric Determination of Total Amounts of the Six Polycyclic Aromatic Hydrocarbons Officially Designated as Indicators of Drinking Water Quality. J AOAC Int 2020. [DOI: 10.1093/jaoac/78.2.402] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
We report a quick, simple method for determination of the joint concentration of the 6 polycyclic aromatic hydrocarbons (PAHs) designated by current legislation as quality indicators for drinking water and for surface waters destined for use as drinking water. Water samples are extracted with hexane, and total indicator PAH concentration is determined by synchronous spectrofluorimetry (optimal instrumental parameters are reported). The detection limit (5.0 ng/L), quantitation limit (8.4 ng/L), precision (coefficient of variation, 3.8%), and accuracy (recovery, 77%) were well within the legal bounds for reference methods.
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Affiliation(s)
- Maria J López De Alda-Villaizan
- Universidad de Santiago de Compostela, Facultad de Farmacia, Departamento de Química Analítica, Nutrición, and Bromatología, Area de Nutrición and Bromatología, 15706 Santiago de Compostela, Spain
| | - Soma García-Falcon
- Universidad de Santiago de Compostela, Facultad de Farmacia, Departamento de Química Analítica, Nutrición, and Bromatología, Area de Nutrición and Bromatología, 15706 Santiago de Compostela, Spain
| | - Maria A Lage-Yusty
- Universidad de Santiago de Compostela, Facultad de Farmacia, Departamento de Química Analítica, Nutrición, and Bromatología, Area de Nutrición and Bromatología, 15706 Santiago de Compostela, Spain
| | - Jesús Simal-Lozano
- Universidad de Santiago de Compostela, Facultad de Farmacia, Departamento de Química Analítica, Nutrición, and Bromatología, Area de Nutrición and Bromatología, 15706 Santiago de Compostela, Spain
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Carril González-Barros ST, Álvarez Piñeiro ME, Simal-Lozano J, Lage Yusty MA. Comparación de disolventes para la extracción de materias grasas en hígado. Grasas y Aceites 2010. [DOI: 10.3989/gya.1996.v47.i5.875] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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López Hernández J, González-Castro MJ, Simal-Lozano J, Vázquez-Blanco ME, Vázquez-Orderiz ML. GC determination of fatty acids in green beans grown in Galicia (N.W. Spain). Grasas y Aceites 2010. [DOI: 10.3989/gya.1996.v47.i3.858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Rodríguez-Bernaldo De Quirós A, López-Hernández J, Simal-Lozano J. Simultaneous determination of thiamin and riboflavin in the sea urchin,Paracentrotus lividus, by high-performance liquid chromatography. Int J Food Sci Nutr 2009; 55:259-63. [PMID: 15369980 DOI: 10.1080/09637480310001622323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 10/26/2022]
Abstract
Thiamin and riboflavin were determined in the sea urchin, Paracentrotus lividus, by reversed-phase liquid chromatography with fluorescence detection and a mobile phase consisting of 72% 0.005 M NH(4)OAc and 28% MeOH at a flow rate of 1.450 ml/min. The total analysis time never exceeded 20 min. After acid hydrolysis and enzymatic digestion, thiamin was oxidized to thiochrome and the oxidized fraction was purified and concentrated by solid-phase extraction. Limits of detection were 9 pg/ml and 80 pg/ml for thiamin and riboflavin, respectively. Good results were obtained with respect to repeatability (RSD%<2.4) and recovery (>91.3%).
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Affiliation(s)
- Inés Mato
- a Facultad de Farmacia, Departamento de Química Analítica, Nutrición y Bromatología, Área de Nutrición y Bromatología , Universidad de Santiago , Galicia , Spain
| | - José F. Huidobro
- a Facultad de Farmacia, Departamento de Química Analítica, Nutrición y Bromatología, Área de Nutrición y Bromatología , Universidad de Santiago , Galicia , Spain
| | - Jesús Simal-Lozano
- a Facultad de Farmacia, Departamento de Química Analítica, Nutrición y Bromatología, Área de Nutrición y Bromatología , Universidad de Santiago , Galicia , Spain
| | - M. Teresa Sancho
- b Facultad de Ciencias, Departamento de Biotecnología y Ciencia de los Alimentos, Área de Nutrición y Bromatología , Universidad de Burgos , Burgos , Castilla y León , Spain
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Suarez-Luque S, Mato I, Huidobro JF, Simal-Lozano J, Sancho MT. Capillary zone electrophoresis method for the determination of inorganic anions and formic acid in honey. J Agric Food Chem 2006; 54:9292-6. [PMID: 17147409 DOI: 10.1021/jf061536s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A capillary zone electrophoresis method for the determination of inorganic anions and formic acid in honey samples was developed for the first time. The complete separation of chloride, nitrate, sulfate, phosphate, and formic acid was achieved with a simple electrolyte composed by 2 mM potassium dichromate as the carrier solution and background absorbance provider and 0.05 mM tetraethylenepentamine (TEPA) as electro-osmotic flow suppressor (pH 4.00). Injection was performed hydrostatically by elevating the sample at 10 cm for 10 s. The running voltage was -27 kV at 25 degrees C. Indirect UV absorption detection was achieved at 254 nm. The detection limit was in the range between 0.03 and 20 mg/kg, and the quantification limits ranged from 1.52 to 20.6 mg/kg. The calibration graphs were linear in the concentration range from the quantification limit to at least 2.5 g/kg for chloride, 0.25 g/kg for nitrate, 0.75 g/kg for sulfate, 1.50 g/kg for phosphate, and 0.75 g/kg for formic acid. Precision data in the honey samples analyzed showed repeatability and reproducibility relative standard deviations lower than 1.4 and 2.4% for migration time and lower than 1.8 and 4.3% for anion content, respectively. Recoveries of anions in honey samples analyzed ranged from 94.4 to 99.8%. Ten honey samples were analyzed to test the proposed method. Mean contents of 260.5, 3.93, 60.5, 139.4, and 209.3 mg/kg were found, respectively, for chloride, nitrate, sulfate, phosphate, and formic acid in analyzed honeys. These results agreed with literature data.
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Affiliation(s)
- Silvia Suarez-Luque
- Facultad de Farmacia, Departamento de Química Analítica, Nutrición y Bromatología, Area de Nutrición y Bromatología, Universidad de Santiago, 15782 Santiago de Compostela, Galicia, Spain
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Mato I, Huidobro JF, Simal-Lozano J, Sancho MT. Simultaneous determination of organic acids in beverages by capillary zone electrophoresis. Anal Chim Acta 2006. [DOI: 10.1016/j.aca.2006.02.043] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Mato I, Huidobro JF, Simal-Lozano J, Sancho MT. Rapid determination of nonaromatic organic acids in honey by capillary zone electrophoresis with direct ultraviolet detection. J Agric Food Chem 2006; 54:1541-50. [PMID: 16506798 DOI: 10.1021/jf051757i] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
A rapid capillary zone electrophoresis (CZE) method with direct ultraviolet (UV) detection has been set up and developed to determine the most important nonaromatic organic acids in honey with a really simple treatment of the sample. The determination of oxalic, formic, malic, succinic, pyruvic, acetic, lactic, citric, and gluconic acids has been carried out in 4 min. The electrolyte composition was phosphate as the carrier buffer (7.5 mM NaH(2)PO(4) and 2.5 mM Na(2)HPO(4)), 2.5 mM tetradecyltrimethylammonium hydroxide (TTAOH) as electroosmotic flow modifier, and 0.24 mM CaCl(2) as selectivity modifier, with the pH adjusted at 6.40 constant value. The running voltage was -25 kV at a thermostated temperature of 25 degrees C. The injections were performed in hydrodynamic mode (30 s), and the detection mode was UV direct at 185 nm. Validation parameters of the method as detection and quantification limits, linearity, precision (repeatability and reproducibility), and recovery were also studied. The advantages related to the technique such as simplicity, short analysis times, and low consumption of chemicals as well as the good validation parameters obtained for this method permit it to be considered as adequate for routine analysis in honey.
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Affiliation(s)
- Inés Mato
- Facultad de Farmacia, Departamento de Química Analítica, Nutrición y Bromatología, Area de Nutrición y Bromatología, Universidad de Santiago, 15782 Santiago de Compostela, Galicia, Spain
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Lage-Yusty MA, López-González J, Simal-Lozano J. Resolution of 13 polycyclic aromatic hydrocarbons by constant-wavelength synchronous spectrofluorometry. ANAL SCI 2006; 21:1203-6. [PMID: 16270579 DOI: 10.2116/analsci.21.1203] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [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: 11/23/2022]
Abstract
A method capable of determining 13 PAHs (acenaphthene, anthracene, benzo[a]anthracene, benzo[a]pyrene, benzo[b]fluoranthene, benzo[k]fluoranthene, chrysene, dibenzo[ah]anthracene, fluoranthene, fluorene, indene[1,2,3-cd]pyrene, phenanthrene and pyrene) in a mixture of 16 EPA PAHs by second derivative synchronous spectrofluorometry in the constant wavelength mode was developed. It has not been possible to determine the following PAHs in the mixture: acenaphthylene, benzo[ghi]perylene and naphthalene. The approach studied allows the sensitive, rapid and inexpensive identification and quantitation of 13 PAHs in a solution of hexane. The detection limits are <1 microg L(-1) (except for chrysene and phenanthrene).
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Affiliation(s)
- Maria Asunción Lage-Yusty
- Department of Analytical Chemistry, Nutrition and Bromatology, Area of Nutrition and Bromatology, Faculty of Pharmacy, University of Santiago de Compostela, Spain.
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Abstract
A capillary electrophoresis system for the simultaneous determination of cations in honey samples has been developed. The complete separation and quantification of K+, Ca2+, Na+, Mg2+, Mn2+, Ni2+ and Li+, which represent more than 99% of the total content of cations in honey, can be achieved in 4 min with only a dilution and filtration of the honey sample. Electrolyte solution was composed by 10 mM imidazole as the carrier buffer and background absorbance provider and acetic acid as the complexing agent (pH 3.60). The running voltage was + 25 kV at 25 degree C. Indirect UV detection was achieved at 185 nm. Under the optimum conditions the detection limits ranged from 0.02 to 48.2 mg/kg and the quantification limits have ranged from 0.41 to 48.7 mg/kg. Precision data in honey samples analysed have shown repeatability and reproducibility RSD (%) lower than 2.84 and 6.62%, respectively. Recoveries of cations in honey samples analysed have ranged from 88.5 to 101.8%. These cations were identified by their relative migration times with regard to Ba2+ migration time used as reference standard and they were quantified by using an external standard calibration. Twenty-five honey samples were analysed to test the proposed method. Mean contents of 1.22 x 10(3), 93, 85, 54, 11, 1.9 and 2.3 mg/kg were found, respectively, for K+, Ca2+, Na+, Mg2+, Mn2+, Ni2+ and Li+ cations in analysed honeys. These results were similar than the obtained by other authors.
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Affiliation(s)
- Silvia Suárez-Luque
- Facultad de Farmacia, Departamento de Química Analítica, Nutrición y Bromatología, Area de Nutrición y Bromatología, Universidad de Santiago, 15782 Santiago de Compostela (Galicia), Spain
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11
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Sánchez-Machado DI, López-Cervantes J, López-Hernández J, Paseiro-Losada P, Simal-Lozano J. Determination of the uronic acid composition of seaweed dietary fibre by HPLC. Biomed Chromatogr 2004; 18:90-7. [PMID: 15039960 DOI: 10.1002/bmc.297] [Citation(s) in RCA: 27] [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: 11/08/2022]
Abstract
A high-performance liquid chromatographic (HPLC) method is described for determination of the ratio of beta-d-mannuronic acid to alpha-l-guluronic acid (M/G ratio) in dietary fibre of edible seaweeds. Total dietary fibre (TDF) content was determined gravimetrically. The TDF fraction was hydrolysed with 12 m and 1 m H(2)SO(4), then neutralized with AG 4 x 4 resin. The uronic acids were separated in a Tracer Extrasil SAX 5 micro m column (25 cm x 4 mm) at 35 degrees C, with 2 mm KH(2)PO(4) containing 5% methanol as mobile phase at a fl ow rate of 1.5 mL/min. The detection wavelength was UV 210 nm. The chromatographic identifications of beta-d-mannuronic acid and alpha-l-guluronic acid were confirmed by liquid chromatography-mass spectrometry (LC-MS). The method precision was 1.4% for beta-d-mannuronic acid and 3.5% for alpha-l-guluronic acid. The method was used to determine M/G ratio in canned seaweeds (Saccorhiza polyschides and Himanthalia elongata) and in dried seaweeds (H. elongata, Laminaria ochroleuca, Undaria pinnatifida, Palmaria sp. and Porphyra sp.).
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Affiliation(s)
- D I Sánchez-Machado
- Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, La Coruña, Spain
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Abstract
Although organic acids represent < 0.5% of honey's constituents, they make important contributions to the organoleptic, physical, and chemical properties of honey. To date, approximately 30 nonaromatic organic acids have been identified in honey, but relatively little attention has been paid to these components. This article reviews the current literature related to the significance of nonaromatic organic acids in honey; it was written with a goal of attracting researchers to study these interesting honey components. Previous research contributions on nonaromatic organic acids in honey may be classified into five main areas: (i) the antibacterial activities of these acids, (ii) the antioxidant activities of these acids, (iii) the use of these acids as possible indicators of incipient fermentation, (iv) the use of these acids for treatment of Varroa infestation, and (v) the use of these acids as factors for the characterization of both botanical and geographical origins of honeys. We conclude that nonaromatic organic acids are of interest for diverse reasons and that there is a particular need for studies regarding their possible antibacterial and antioxidant activities.
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Affiliation(s)
- Inés Mato
- Facultad de Farmacia, Departamento de Química Analítica, Nutrición y Bromatología, Area de Nutrición y Bromatología, Universidad de Santiago, 15782 Santiago de Compostela, Galicia, Spain
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Suárez-Luque S, Mato I, Huidobro JF, Simal-Lozano J, Sancho MT. Rapid determination of minority organic acids in honey by high-performance liquid chromatography. J Chromatogr A 2002; 955:207-14. [PMID: 12075924 DOI: 10.1016/s0021-9673(02)00248-0] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.6] [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: 11/30/2022]
Abstract
A rapid high-performance liquid chromatographic method for the determination of organic acids in honey is reported. Malic, maleic, citric, succinic and fumaric acids were identified and quantified in 15 min. First time repeatibility, reproducibility and recoveries were determined out for these acids in honey samples. Maleic acid was also quantified for first time by a chromatographic method. The organic acids were removed from honey by using a solid-phase extraction procedure with anion-exchange cartridges. Previously, the solution of honey was adjusted to pH 10.50 with 0.1 M NaOH and stirred for 15 min at room temperature. Then, this solution was adjusted to pH 5.00 with 0.1 M H2SO4. This procedure was carried out to avoid interferences in the baseline. The chromatographic separation was achieved with only one Spherisorb ODS-2 S5 column thermostated at 25 degrees C. Metaphosphoric acid (pH 2.20) was used as mobile phase at a flow-rate of 0.7 ml/min. Organic acids were detected with a UV-vis detector (215 nm). The precision results showed that the relative standard deviations of the repeatability and reproducibility were < or =3.20% and < or =4.86%, respectively. The recoveries of the organic acids ranged from 62.9 to 99.4%. Under optimum conditions the detection limits ranged from 0.0064 to 7.57 mg/kg and the quantification limits ranged from 0.025 to 10.93 mg/kg.
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Affiliation(s)
- Silvia Suárez-Luque
- Facultad de Farmacia, Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Santiago, Santiago de Compostela (Galicia), Spain.
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Rodriguez-Bernaldo de Quiros A, López-Hernández J, Simal-Lozano J. Separation of phospholipid classes in sea urchin, paracentrotus lividus by high-performance liquid chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 770:71-5. [PMID: 12013246 DOI: 10.1016/s1570-0232(01)00628-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [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: 11/28/2022]
Abstract
A simple high-performance liquid chromatography (HPLC) method for determination of major phospholipid classes in sea urchin Paracentrotus lividus is described. The separation was performed on a Tracer Extrasil SI 5 microm 25 x 0.4 cm column and an isocratic mobile phase of acetonitrile-methanol 85%-phosphoric acid (50:50:1.8, v/v). The HPLC method utilizes UV detection at 205 nm. Five phospholipids were identified and quantified: phosphatidylinositol (PI), phosphatidylserine (PS), phosphatidylethanolamine (PE), phosphatidylcholine (PC) and sphingomyelin (SM). Fresh and canned samples were analyzed. Student's t-test showed no significant difference (P < or = 0.05) between the mean phospholipid contents of raw and canned sea urchin.
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Suárez-Luque S, Mato I, Huidobro JF, Simal-Lozano J. Solid-phase extraction procedure to remove organic acids from honey. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 770:77-82. [PMID: 12013247 DOI: 10.1016/s1570-0232(01)00583-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [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: 11/30/2022]
Abstract
A solid-phase extraction procedure was applied to remove organic acids from honey. Malic, maleic, citric, succinic and fumaric acids were isolated with an anion-exchange cartridge. The different parameters which affected the extraction procedure were studied and optimised to establish the optimal conditions for maximum recovery of organic acids and minimum extraction of interferences. The optimised procedure used a cartridge which was activated with 10 ml of 0.1 M sodium hydroxide solution (percolation rate 3 ml/min). A 10 ml volume of honey solution was passed at a flow-rate of 0.5 ml/min. The cartridge was washed with 10 ml of water (3 ml/min) and organic acids were eluted with 4 ml of 0.1 M sulfuric acid (0.5 ml/min). This solution was injected directly into the chromatograph. When this procedure was carried out on standard solutions of organic acids, recoveries between 99.2 and 103.4% were found. If this procedure was applied to honey samples these recoveries were also satisfactory and ranged from 62.9 to 99.4%.
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Affiliation(s)
- Silvia Suárez-Luque
- Facultad de Farmacia, Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Santiago, Santiago de Compostela, Galicia, Spain
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López-López TJ, Alvarez-Piñeiro ME, Lage-Yusty MA, Simal-Lozano J. PCBs in three predatory birds from Galicia (NW Spain). Bull Environ Contam Toxicol 2001; 66:497-503. [PMID: 11443313 DOI: 10.1007/s001280034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2000] [Accepted: 02/04/2001] [Indexed: 05/23/2023]
Affiliation(s)
- T J López-López
- Department of Analytical Chemistry, Nutrition and Bromatology, Area Nutrition and Bromatology, Faculty of Pharmacy, University of Santiago of Compostela Campus Sur s/n, 15706-Santiago Compostela (La Coruña), Spain
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de Quirós ARB, Lopez-Hernandez J, Simal-Lozano J. Determination of vitamin C in sea urchin: Comparison of two HPLC methods. Chromatographia 2001. [DOI: 10.1007/bf02490336] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Rodríguez-Bernaldo De Quirós AI, López-Hernández J, González-Castro MJ, De la Cruz-García C, Simal-Lozano J. Comparison of volatile components in raw and cooked green beans by GC-MS using dynamic headspace sampling and microwave desorption. Eur Food Res Technol 2000. [DOI: 10.1007/pl00005517] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Carril González-Barros ST, Alvarez-Piñeiro ME, Simal-Lozano J, Lage-Yusty MA. Levels of aliphatic hydrocarbons in viscera of wolves (Canis lupus, L) in Galicia (N. W. Spain). Bull Environ Contam Toxicol 1997; 59:543-547. [PMID: 9307417 DOI: 10.1007/s001289900513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- S T Carril González-Barros
- Department of Analytical Chemistry, Nutrition of Bromatology, Area of Nutrition and Bromatology, Faculty of Pharmacy, University of Santiago de Compostela, Campus s/n, 15706 Santiago de Compostela (La Coruña), Spain
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Oruña-Concha MJ, González-Castro MJ, López-Hernández J, Simal-Lozano J. Effects of freezing on the pigment content in green beans and padrón peppers. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/s002170050143] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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González-Castro MJ, Oruña-Concha MJ, López-Hernández J, Simal-Lozano J. Effects of freezing on the organic acid content of frozen green beans and Padrón peppers. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/s002170050091] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Gonzalez-Castro MJ, Lopez-Hernandez J, Simal-Lozano J, Oruna-Concha MJ. Determination of Amino Acids in Green Beans by Derivatization with Phenylisothiocianate and High-Performance Liquid Chromatography with Ultraviolet Detection. J Chromatogr Sci 1997. [DOI: 10.1093/chromsci/35.4.181] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Abstract
Honey samples (101) from Galicia (N.W. Spain) were analyzed by gas chromatography (electron capture and flame ionization) for the presence of acaricides (amitraz, bromopropylate, coumaphos, and fluvalinate). Seventy-three samples were free from detectable residues. Bromopropylate residues were found in 16 samples in levels ranging from 5 to 60 microg/kg. Fluvalinate residues were found in 11 samples in levels ranging from 10 to 40 microg/kg. One sample contained 100 microg of fluvalinate per kg. Neither amitraz nor coumaphos residues were detected.
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Affiliation(s)
- M A Fernandez Muiño
- Area de Nutrición y Bromatología, Facultad de Ciencia y Tecnología de los Alimentos y Ciencias Químicas, Universidad de Burgos, Castilla y León, Spain.
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Gonzalez-Castro MY, Oruña-Concha MJ, Lopez-Hernandez J, Simal-Lozano J, Ganza-Gonzalez A. Effects of blanching, freezing and freeze-drying on the fatty acid contents of green beans. Z Lebensm Unters Forsch 1996; 203:370-3. [PMID: 9123974 DOI: 10.1007/bf01231076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
GC-FID was used to monitor changes over time in palmitic, stearic, arachidic, oleic, linoleic and linoleic acid contents of green beans subjected to various preservation treatments. In beans stored in polyethylene bags at -22 degrees C without prior blanching, all fatty acid contents dropped appreciably within the first month of storage, regardless of whether the beans had been hand- or vacuum-packed. In beans which had been freeze-dried then stored at room temperature in an airtight container, polyunsaturated fatty acid contents dropped appreciably only after 2 months.
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Affiliation(s)
- M Y Gonzalez-Castro
- Departamento de Quimica Analitica, Nutrition y Bromatologia, Facultad de Farmacia, Universidad de Santiago de Compostela, La Coruña, Spain
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Fernández-Muiño MA, Sancho MT, Muniategui S, Huidobro JF, Simal-Lozano J. Nonacaricide Pesticide Residues in Honey: Analytical Methods and Levels Found. J Food Prot 1995; 58:1271-1274. [PMID: 31137304 DOI: 10.4315/0362-028x-58.11.1271] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A bibliographic review on honey pollution with pesticides is presented. This paper reviews the methods set up for determining pesticide residues in honey samples as well as the pesticide residue levels found in European countries.
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Affiliation(s)
- M A Fernández-Muiño
- Area de Nutrición y Bromatología, Facultad de Ciencia y Tecnología de los Alimentos, Universidad de Burgos, Plaza de Misael Bañuelos s/n. 09001 Burgos (Castilla y León), Spain
| | - M T Sancho
- Area de Nutrición y Bromatología, Facultad de Ciencia y Tecnología de los Alimentos, Universidad de Burgos, Plaza de Misael Bañuelos s/n. 09001 Burgos (Castilla y León), Spain
| | - S Muniategui
- Area de Química Analítica, Facultad de Ciencias, Universidad de La Coruña, Campus de Zapateira s/n. La Coruña (Galicia), Spain
| | - J F Huidobro
- Area de Nutricón y Bromarología, Facultad de Farmacia, Universidad de Santiago de Compostela, 15706 Santiago de Compostela (Galicia), Spain
| | - J Simal-Lozano
- Area de Nutricón y Bromarología, Facultad de Farmacia, Universidad de Santiago de Compostela, 15706 Santiago de Compostela (Galicia), Spain
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Vazquez-Blanco ME, Lopez-Hernandez J, Vazquez-Oderiz ML, Simal-Lozano J, Gonzalez-Castro MJ. Determination of Pectins by HPLC A Comparison of Two Methods Applied to Green Beans (Phaseolus vulgaris, L.). J Chromatogr Sci 1995. [DOI: 10.1093/chromsci/33.10.551] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Abstract
A bibliographic review on the pollution of honey with acaricides is presented. This paper reviews methods for determining amitraz, bromopropylate, coumaphos, cymiazole, fluvalinate, malathion and phenothiazine residues in honey samples, as well as multiresidue methods. Acaricide residue levels found in European countries are also reviewed.
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Affiliation(s)
- M A Fernandez-Muiño
- Area de Nutrición y Bromatologí,a, Facultad de Ciencia y Tecnología de los Alimentos, Universidad de Burgos, Plaza de Misael Banuelos s/n, 09001 Burgos (Castilla y León), Spain
| | - M T Sancho
- Area de Nutrición y Bromatologí,a, Facultad de Ciencia y Tecnología de los Alimentos, Universidad de Burgos, Plaza de Misael Banuelos s/n, 09001 Burgos (Castilla y León), Spain
| | - S Muniategui
- Area de Química Analítica, Facultad de Ciencias, Universidad de La Coruña, Campus de Zapateira s/n, 15071 La Coruña (Galicia), Spain
| | - J F Huidobro
- Area de Nutrición y Bromatología, Facultad de Farmacia, Universidad de Santiago de Compostela, 15706 Santiago de Compostela (Galicia), Spain
| | - J Simal-Lozano
- Area de Nutrición y Bromatología, Facultad de Farmacia, Universidad de Santiago de Compostela, 15706 Santiago de Compostela (Galicia), Spain
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López de Alda-Villaizan MJ, García-Falcon S, Lage-Yusty MA, Simal-Lozano J. Synchronous spectrofluorimetric determination of total amounts of the six polycyclic aromatic hydrocarbons officially designated as indicators of drinking water quality. J AOAC Int 1995; 78:402-6. [PMID: 7756856] [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: 01/27/2023]
Abstract
We report a quick, simple method for determination of the joint concentration of the 6 polycyclic aromatic hydrocarbons (PAHs) designated by current legislation as quality indicators for drinking water and for surface waters destined for use as drinking water. Water samples are extracted with hexane, and total indicator PAH concentration is determined by synchronous spectrofluorimetry (optimal instrumental parameters are reported). The detection limit (5.0 ng/L), quantitation limit (8.4 ng/L), precision (coefficient of variation, 3.8%), and accuracy (recovery, 77%) were well within the legal bounds for reference methods.
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Affiliation(s)
- M J López de Alda-Villaizan
- Universidad de Santiago de Compostela, Facultad de Farmacia, Departamento de Química Analítica, Nutrición, and Bromatología, Spain
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Vazquez-Blanco ME, Vazquez-Oderiz ML, Lopez-Hernandez J, Simal-Lozano J, Romero-Rodriguez MA. HPLC Determination of Pectins in Raspberries as Galacturonic Acid and Optimization Using Forward Optical Scanning. J Chromatogr Sci 1993. [DOI: 10.1093/chromsci/31.11.477] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Romero-Rodriguez M, Vazquez-Oderiz M, Lopez-Hernandez J, Simal-Lozano J. Physical and analytical characteristics of the kiwano. J Food Compost Anal 1992. [DOI: 10.1016/0889-1575(92)90065-r] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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