scholarly journals Phytochemical screening and analysis of heavy metals of Nerium oleander (L.) leaves

2020 ◽  
Vol 10 (4) ◽  
pp. 346
Author(s):  
Jamila Fliou ◽  
Ouassima Riffi ◽  
Ali Amechrouq ◽  
Mohammed Elhourri ◽  
Mostafa El Idrissi ◽  
...  
Keyword(s):  
Absorption Spectrometry ◽  
Scientific Data ◽  
The Other ◽  
Nerium Oleander ◽  
Phytochemical Screening ◽  
Low Concentrations ◽  
Anthracene Derivatives ◽  
Harmful Effects ◽  
Pb Concentration

<p>The main objective of this research is studying phytochemical screening of the extracts of polluted <em>Nerium oleander</em> (L.), and unpolluted<em> Nerium oleander</em> (L.) collected from Meknes region (Morocco), and determination of metals concentration that can have harmful effects on human health. In addition, the study provides scientific data.</p><p>Studies have shown that the two extracts of polluted <em>Nerium oleander</em> (L.) and unpolluted <em>Nerium oleander</em> (L.) plant are rich in flavonoids, catechic and gallic tannins. In contrast, anthracene derivatives and flavonoids are absent. On the other hand, the comparative analysis of the results of atomic absorption spectrometry showed that the two plants of polluted <em>Nerium oleander</em> (L.) and unpolluted <em>Nerium oleander</em> (L.) contain a fairly high content of Na, Ca and Mg while the Pb concentration has exceeded the standard given by the WHO. While lithium and iron are present in low concentrations.</p>

Changes in Volatile Compounds during Ripening in Grapes of Airén, Macabeo and Chardonnay White Varieties Grown in La Mancha Region (Spain)

2003 ◽  
Vol 9 (1) ◽  
pp. 33-41 ◽  
Author(s):  
E. García ◽  
J. L. Chacón ◽  
J. Martínez ◽  
P. M. Izquierdo
Keyword(s):  
Volatile Compounds ◽  
Benzyl Alcohol ◽  
Volatile Compound ◽  
The Other ◽  
Optimum Level ◽  
Grape Variety ◽  
La Mancha ◽  
Low Concentrations

Changes in volatile compounds in musts and skins of grapes of Airén, Macabeo and Chardonnay white varieties were determined during ripening. The musts of the Airén variety contained higher concentrations of c-3-hexenol; musts of the Macabeo variety were the richest in t-3-hexenol and 2,4-hexadienal, while the Chardonnay musts stood out for having higher concentrations of benzaldehyde, phenylacetaldehyde and benzyl alcohol. The skins of the three varieties were both qualitatively and quantitatively richer in volatiles than were the musts. The skins of the Airén grapes had the highest levels of nerol. Airén grapes were the only variety in which citronellol was present in the skins. Low concentrations of eugenol were detected in the skins of the Chardonnay grape variety but were not present in the other two varieties. Changes in the concentration of the volatile compounds during ripening were not uniform; this made difficult the determination of the optimum level of ripening for each variety on the basis of the volatile compound content. Nevertheless, results indicated that C6 compounds and terpene concentrations reached a maximum at 6-8 ° Baumé in the Airén grapes and at around 11 ° Baumé in the Chardonnay and Macabeo grapes.

THE COLORIMETRIC DETERMINATION OF PLATINUM WITH 5-(p-DIMETHYLAMINOBENZYLIDENE)-RHODANINE

1963 ◽  
Vol 41 (3) ◽  
pp. 667-670 ◽  
Author(s):  
Frances E. Piercy ◽  
D. E. Ryan
Keyword(s):  
Ascorbic Acid ◽  
The Other ◽  
Colorimetric Determination ◽  
Platinum Metals ◽  
Low Concentrations ◽  
Fold Excess

5-(p-Dimethylaminobenzylidene)-rhodanine is used to determine 0.5 to 6 p.p.m. of platinum colorimetrically, after reduction of platinum IV with ascorbic acid. Platinum can be determined in the presence of a 10-fold excess of palladium; low concentrations of the other platinum metals, except rhodium, do not seriously interfere.

scholarly journals Spectrochemical determination of lead in wines

2000 ◽  
Vol 65 (5-6) ◽  
pp. 323-329 ◽  
Author(s):  
Mirjana Tripkovic ◽  
Marija Todorovic ◽  
Ivanka Holclajtner-Antunovic ◽  
Slavica Razic ◽  
Aleksandra Kandic ◽  
...  
Keyword(s):  
Electrothermal Atomic Absorption Spectrometry ◽  
Time Integration ◽  
Standard Addition ◽  
Organic Matrix ◽  
Absorption Spectrometry ◽  
Atomic Emission ◽  
Low Concentrations ◽  
Comparison Of The Results ◽  
Complex Organic

The determination of lead in wines of different origin was performed by means of atomic emission spectroscopy with argon stabilized DC. U-shaped arc and electrothermal atomic absorption spectrometry. The comparison of the results obtained by the direct and standard addition method has indicated the presence of a depressive effect of the complex organic matrix. The effect is avoided successfully by mineralization, as well as by dissolution of the samples. Thus, a relative simple but precise and sensitive method involving the application of a stabilized arc and photoelectric detection with time integration of the emission signals is recommended for the determination of low concentrations of lead in wines. The complex organic matrix was investigated by recording the IR spectra of different wine fractions.

scholarly journals Determination of Cadmium, Aluminium, and Copper in Beer and Products Used in Its Manufacture by Electrothermal Atomic Absorption Spectrometry

2002 ◽  
Vol 85 (3) ◽  
pp. 736-743 ◽  
Author(s):  
Pilar Viñas ◽  
Nerea Aguinaga ◽  
Ignacio López-García ◽  
Manuel Hernández-Córdoba
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Certified Reference Materials ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Sample Digestion ◽  
Low Concentrations

Abstract Procedures were developed for determining cadmium, aluminium, and copper in beer and the products used in its manufacture by electrothermal atomic absorption spectrometry. Beer samples were injected into the furnace and solid samples were introduced as suspensions after preparation in a medium containing hydrogen peroxide, nitric acid, and ammonium dihydrogen phosphate for cadmium atomization. Calibration was performed with aqueous standards, and characteristic masses and detection limits were, respectively, 1 and 0.3 pg for cadmium, 18 and 5.4 pg for aluminium, and 5.6 and 6.8 pg for copper. Different samples of beer, wort, brewer's yeast, malt, raw grain, and hops were analyzed by the proposed procedures. Cadmium was found in low concentrations (0.001–0.08 μg/g and 0–1.3 μg/mL); copper (3–13 μg/g and 25–137 μg/mL) and aluminium (0.6–9 μg/g and 0.1–2 μg/mL) were found at higher levels. The reliability of the procedure was confirmed by comparing the results obtained with others based on microwave oven sample digestion, and by analyzing several certified reference materials.

scholarly journals Comparison of Multiple Bioactive Constituents in the Corolla and Other Parts of Abelmoschus manihot

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1864
Author(s):  
Shengxin Yin ◽  
Yuqi Mei ◽  
Lifang Wei ◽  
Lisi Zou ◽  
Zhichen Cai ◽  
...  
Keyword(s):  
Ion Trap ◽  
Distribution Patterns ◽  
Scientific Data ◽  
The Other ◽  
Bioactive Constituents ◽  
Medicinal Value ◽  
Components Analysis ◽  
Fast Performance Liquid Chromatography ◽  
Different Parts

Abelmoschus manihot (L.) Medic (AM), called Huangshukui in Chinese, is a widely used medicinal plant. Each part of AM has medicinal value, including Abelmoschi Radix (AR), Abelmoschi Herba (AH), Abelmoschi Folium (AF), Abelmoschi Corolla (AC), and Abelmoschi Semen (AS). However, only AC is documented in the Chinese Pharmacopoeia. In order to investigate whether there is any difference between AC and the other parts of AM, an analytical method based on ultra-fast performance liquid chromatography coupled with triple quadrupole-linear ion trap mass spectrometry (UFLC-QTRAP-MS/MS) was established for the simultaneous determination of 35 constituents in different parts of AM. Moreover, principal components analysis (PCA) and partial least squares discriminant analysis (PLS-DA) were applied to classify and evaluate the different parts of AM based on the content of the 35 constituents. The total contents of the 35 constituents in AC were significantly higher than in the other parts of AM and the results revealed significant differences between AC and the other parts of AM. Eight constituents were remarkably related to the sample classifications. This research does not just provide the basic information for revealing the distribution patterns in different parts of AM from the same origin, but also complements some of the scientific data for the comprehensive quality evaluation of AC.

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