Nutritional Composition of the Atlantic Seaweeds Ulva rigida, Codium tomentosum, Palmaria palmata and Porphyra purpurea

2021 ◽  
Vol 5 (1) ◽  
pp. 67
Author(s):  
Javier Echave ◽  
Catarina Lourenço-Lopes ◽  
Anxo Carreira-Casais ◽  
Franklin Chamorro ◽  
Maria Fraga-Corral ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Unsaturated Fatty Acids ◽  
Soxhlet Extraction ◽  
Atomic Emission ◽  
Nutritional Composition ◽  
Palmaria Palmata ◽  
Acid Extraction ◽  
Ulva Rigida ◽  
Edible Seaweed ◽  
Porphyra Purpurea

Macroalgae are regarded as a healthy food due to their composition and nutritional properties. In this work, nutritional composition of two green (Ulva rigida, Codium tomentosum) and two red (Palmaria palmata, Porphyra purpurea) edible seaweed was studied. Total lipids were measured gravimetrically as evaporated mass after petroleum-ether Soxhlet extraction of samples. In addition, fatty acid profile was determined by gas chromatography coupled to a flame ionization detector (GC-FID). Results showed that all studied species were accounted for very low levels of lipids (<1% dw), but levels of unsaturated fatty acids oleic, linoleic, and linolenic acids were present at high concentrations, with P. palmata displaying the highest quantities (>200 mg C18:1/g extract). In parallel, proteins were quantified following the macro-Kjeldahl method. In this analysis, red algae, especially P. purpurea, showed significant protein content up to 30% DW. Total organic acids were found by ultra-filtration liquid-chromatography coupled to an amperometry detector (UFLC-PAD) after an acid extraction, P. purpurea being the algae with the higher organic acid content (10.61% dw). Minerals were identified and quantified by inductively coupled plasma atomic emission spectroscopy (ICP-OES), suggesting that both algae groups are rich in K and Mg (>15 g/kg), but U. rigida also displayed a remarkable iron content (>1 g Fe/kg). Other detected minerals in minor concentrations were Ca, P or F. Altogether, results corroborate that these edible algae are a good source of nutrients in accordance with literature.

Compatibility of a petroleum spray oil and foliar zinc fertilisers

1996 ◽  
Vol 36 (3) ◽  
pp. 331
Author(s):  
MC Hodgkinson ◽  
DC Joyce ◽  
AP Mackey ◽  
DS Sagatys ◽  
TS Schmiede ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Inductively Coupled Plasma ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Zn Deficiency ◽  
Acid Extraction ◽  
Plasma Atomic Emission Spectrometry ◽  
Zinc Deposition ◽  
Solvent Washing ◽  
Petroleum Spray Oil

The performance of 7 commercial zinc (Zn) foliar nutrients sprays, based on sulfate (Top ZM), hydrated sulfate (Pivot Zinsol; Pivot Mangasol-zinc), oxide (Phosyn Zintrac), and ligninsulfonate (Spray-gro Zn PC; Spray-gro Zn/Mn PC; SJB), were assessed with and without addition of a horticultural petroleum spray oil (PSO), Ampol D-C-Tron NR. Foliar Zn deposition and absorption was quantified by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) after solvent washing and acid extraction. Effects on photosystem II were measured by chlorophyll fluorescence. Although none of the Zn sprays were soluble in PSO, all but Zn oxide could be suspended adequately before spraying. A partial emulsion break occurred with Zn sulfate and hydrated sulfates. All treatments increased the Zn content of leaves by an amount likely to alleviate Zn deficiency. Addition of PSO decreased deposition and absorption of Zn when used with the inorganic formulations or with Spray-gro Zn PC. Zinc deposition and absorption were increased by PSO in Spray-gro Zn/Mn PC, and were unaffected by PSO in SJB. Plant chlorophyll fluorescence and phosphorus content did not differ among treatments. The ligninsulfonates Spray-gro Zn/Mn PC and SJB were most compatible with Ampol D-C-Tron NR, and had relatively low potential for Zn pollution of the environment.

scholarly journals Algunos aportes en la extracción de vanadio, níquel y azufre en petrocoque

2016 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Ligbel Sánchez Castillo ◽  
Gusdanis Alberto Campos García ◽  
Ana Beatriz Cáceres
Keyword(s):  
Inductively Coupled Plasma ◽  
Soxhlet Extraction ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Mechanical Stirring ◽  
Palabras Clave ◽  
Radiation Induced ◽  
Extraction Processes

Se presentan algunas contribuciones procedimentales para la extracción de vanadio (V), níquel (Ni) y azufre (S) en petrocoque. Las muestras se sometieron a varios procesos de extracción inducidos por agitación mecánica a 50°C, radiación UV y microondas, empleando como agentes extractantes: HCl:HNO3 (1:1) al 10 y 20%,  H2O2 al 30%, HCl al 10%, NH4OH al 10 y 20% y H2O desionizada. La caracterización de las muestras y la cuantificación de los elementos estudiados, se realizó por análisis elemental, análisis térmico, cromatografía iónica, espectrometría de emisión atómica con plasma acoplado inductivamente (ICP-AES) y fluorescencia de rayos X (XRF). Se encontró la mayor eficiencia, induciendo la extracción con radiación microondas, obteniendo 41% para S con una solución al 20% de HCl:HNO3 (1:1) y para V de 20% con H2O2. La agitación mecánica a 50°C resultó eficiente para la extracción de Ni (2,5%) con HCl:HNO3 (1:1) al 10%. De igual manera, resultó una excelente alternativa para la extracción de S, alcanzando valores hasta de 26%. De forma similar, los procedimientos inducidos con radiación UV, también resultaron eficientes en la extracción de S, obteniendo entre 26 y 37% con las soluciones de ácidos al 20%, NH4OH al 10% y H2O2. Por otra parte, empleando la extracción Soxhlet solo con H2O desionizada, se demostró que es posible extraer hasta un 6% de V, Ni y S presentes en el petrocoque, lo que sugiere que estos elementos se encuentren disponibles en el ecosistema circundante a los depósitos de coque en las refinerías Palabras clave: Petrocoque, extracción de V, Ni y S, contaminación ambiental.   Abstract: Some procedural contributions for the extraction of vanadium (V), nickel (Ni) and sulfur (S) are presented in petcoke. The samples were subjected to various extraction processes induced by mechanical stirring at 50°C, UV and microwave radiation, using as extractants agents: 10 and 20% HCl:HNO3 (1:1), 30% H2O2, 10% HCl, 10 and 20% NH4OH and deionized H2O. The characterization of the samples and quantification of the studied elements was carried out by elemental analysis, thermal analysis, ion chromatography, atomic emission spectrometry and inductively coupled plasma (ICP-AES) and X-ray fluorescence (XRF). It found greater efficiency, inducing extraction under microwave irradiation, obtaining S extractions of 41% with a 20% solution of HCl:HNO3 (1:1) and 20% of V with H2O2. The mechanical stirring at 50°C was efficient for the extraction of Ni (2.5%) with 10% HCl:HNO3 (1:1). Similarly, it proved an excellent alternative for extraction of S, reaching percentages up to 26%. The UV radiation induced methods also were effective in removing S, getting between 26 and 37% with 20% of acid solutions, 10% NH4OH and H2O2. On the other hand, using the Soxhlet extraction alone with deionized H2O, it was shown that it is possible to extract up to 6% of V, Ni and S present in the petcoke, suggesting that these elements are available in the surrounding ecosystem coke deposits in refineries. Key words: Petcoke, extraction of V, Ni and S, environmental pollution.  

Rapid Catalyst Capture Enables Metal-Free Parahydrogen-Based Hyperpolarized Contrast Agents

2018 ◽  
Author(s):  
Danila Barskiy ◽  
Lucia Ke ◽  
Xingyang Li ◽  
Vincent Stevenson ◽  
Nevin Widarman ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Contrast Agents ◽  
Inductively Coupled Plasma ◽  
Organometallic Compounds ◽  
Atomic Emission ◽  
Platinum Group Metals ◽  
Resonance Spectroscopy ◽  
Plasma Atomic Emission ◽  
Inductively Coupled

<p>Hyperpolarization techniques based on the use of parahydrogen provide orders of magnitude signal enhancement for magnetic resonance spectroscopy and imaging. The main drawback limiting widespread applicability of parahydrogen-based techniques in biomedicine is the presence of organometallic compounds (the polarization transfer catalysts) in solution with hyperpolarized contrast agents. These catalysts are typically complexes of platinum-group metals and their administration in vivo should be avoided.</p> <p><br></p><p>Herein, we show how extraction of a hyperpolarized compound from an organic phase to an aqueous phase combined with a rapid (less than 10 seconds) Ir-based catalyst capture by metal scavenging agents can produce pure parahydrogen-based hyperpolarized contrast agents as demonstrated by high-resolution nuclear magnetic resonance (NMR) spectroscopy and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The presented methodology enables fast and efficient means of producing pure hyperpolarized aqueous solutions for biomedical and other uses.</p>

Rapid Catalyst Capture Enables Metal-Free Parahydrogen-Based Hyperpolarized Contrast Agents

2018 ◽  
Author(s):  
Danila Barskiy ◽  
Lucia Ke ◽  
Xingyang Li ◽  
Vincent Stevenson ◽  
Nevin Widarman ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Contrast Agents ◽  
Inductively Coupled Plasma ◽  
Organometallic Compounds ◽  
Atomic Emission ◽  
Platinum Group Metals ◽  
Resonance Spectroscopy ◽  
Plasma Atomic Emission ◽  
Inductively Coupled

<p>Hyperpolarization techniques based on the use of parahydrogen provide orders of magnitude signal enhancement for magnetic resonance spectroscopy and imaging. The main drawback limiting widespread applicability of parahydrogen-based techniques in biomedicine is the presence of organometallic compounds (the polarization transfer catalysts) in solution with hyperpolarized contrast agents. These catalysts are typically complexes of platinum-group metals and their administration in vivo should be avoided.</p> <p><br></p><p>Herein, we show how extraction of a hyperpolarized compound from an organic phase to an aqueous phase combined with a rapid (less than 10 seconds) Ir-based catalyst capture by metal scavenging agents can produce pure parahydrogen-based hyperpolarized contrast agents as demonstrated by high-resolution nuclear magnetic resonance (NMR) spectroscopy and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The presented methodology enables fast and efficient means of producing pure hyperpolarized aqueous solutions for biomedical and other uses.</p>

Silicate analysis of carbonated rocks using ICP-AES with calibration by the concentration ratio

2020 ◽  
Vol 86 (5) ◽  
pp. 16-21
Author(s):  
T. A. Karimova ◽  
G. L. Buchbinder ◽  
S. V. Kachin
Keyword(s):  
Inductively Coupled Plasma ◽  
Concentration Ratio ◽  
Total Error ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Calibration Error ◽  
Plasma Atomic Emission Spectrometry ◽  
Standard Samples ◽  
Inductively Coupled ◽  
Carbonate Materials

Calibration by the concentration ratio provides better metrological characteristics compared to other calibration modes when using the inductively coupled plasma atomic emission spectrometry (ICP-AES) for analysis of geological samples and technical materials on their base. The main reasons for the observed improvement are: i) elimination of the calibration error of measuring vessels and the error of weighing samples of the analyzed materials from the total error of the analysis; ii) high intensity of the lines of base element; and iii) higher accuracy of measuring the ratio of intensities compared to that of measuring the absolute intensities. Calcium oxide is better suited as a base when using calibration by the concentration ratio in analysis of carbonate rocks, technical materials, slags containing less than 20% SiO2 and more than 20% CaO. An equation is derived to calculate the content of components determined in carbonate materials when using calibration by the concentration ratio. A method of ICP-AES with calibration by the concentration ratio is developed for determination of CaO (in the range of contents 20 – 100%), SiO2 (2.0 – 35%), Al2O3 (0.1 – 30%), MgO (0.1 – 20%), Fe2O3 (0.5 – 40%), Na2O (0.1 – 15%), K2O (0.1 – 5%), P2O5 (0.001 – 2%), MnO (0.01 – 2%), TiO2 (0.01 – 2.0%) in various carbonate materials. Acid decomposition of the samples in closed vessels heated in a HotBlock 200 system is proposed. Correctness of the procedure is confirmed in analysis of standard samples of rocks. The developed procedure was used during the interlaboratory analysis of the standard sample of slag SH17 produced by ZAO ISO (Yekaterinburg, Russia).

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