scholarly journals Is the Magnesium Content in Food Supplements Consistent with the Manufacturers’ Declarations?

Nutrients ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 3416
Author(s):  
Anna Puścion-Jakubik ◽  
Natalia Bartosiewicz ◽  
Katarzyna Socha
Keyword(s):  
Age Groups ◽  
Absorption Spectrometry ◽  
Magnesium Content ◽  
Food Supplements ◽  
Quality And Safety ◽  
Tolerance Limits ◽  
Sick People ◽  
Pharmaceutical Form ◽  
Aas Method ◽  
Mg Content

Food supplements (FS) are gaining more and more popularity because they are a quick way to compensate for deficiencies in the diet. Due to their affordable price and easy-to-take form, they are eaten by all age groups and by healthy and sick people. There are many categories of this type of preparations on the market, and FS with magnesium (Mg) are some of the most commonly used. Therefore, the aim of the study was to determine the Mg content in FS and to compare the estimated value with that declared by the manufacturer. The study included 116 FS containing Mg. In order to determine the Mg content, the atomic absorption spectrometry (AAS) method was used. The tested FS were divided in terms of the declared content, pharmaceutical form, chemical form of Mg, composition complexity, and price. It was shown that in the case of 58.7% of the samples, the Mg content was different than the permissible tolerance limits set by the Polish chief sanitary inspectorate, which range from −20% to +45%. It has been estimated that as a result of the differences in the content, the patient may take up to 304% more Mg per day or 98% less than it is stated in the declaration. The above results indicate that the quality and safety of FS should be more closely monitored.

Effect of washing procedures on trace-element content of hair.

1977 ◽  
Vol 23 (9) ◽  
pp. 1771-1772 ◽  
Author(s):  
G S Assarian ◽  
D Oberleas
Keyword(s):  
Trace Element ◽  
Trace Element Analysis ◽  
Trace Element Content ◽  
Magnesium Content ◽  
Preparation Technique ◽  
Element Analysis ◽  
Significant Difference ◽  
Trace Element Status ◽  
Mg Content ◽  
Source Of Information

Abstract A pooled sample of hair was divided and portions prepared for analysis by three washing procedures, to evaluate the effect of washing procedure on the subsequent trace-element (Zn, Cu, Mg) content. The methods selected were a detergent wash, a hexane-ethanol wash, and an acetone-ether-detergent wash. For all elements, there was a significant difference among the results after these wash procedures. Magnesium content of hair was most affected by washing, containing less than half of the magnesium of the unwashed hair. The detergent wash removed the most zinc and magnesium; the acetone-ether-detergent wash removed the most copper. Our results indicate that the trace-element analysis of hair is sensitive to the preparation technique and therefore is an unreliable source of information about trace-element status.

scholarly journals Comparison of Vitros Dry Slide Technology for Determination of Lithium Ions with Other Methods

2006 ◽  
Vol 6 (2) ◽  
pp. 32-36
Author(s):  
Nafija Serdarević ◽  
Ivan Malešić ◽  
Franc Kozjek
Keyword(s):  
Reference Method ◽  
Absorption Spectrometry ◽  
Lithium Carbonate ◽  
T Test ◽  
Selective Electrode ◽  
Lithium Ions ◽  
Control Precision ◽  
Aas Method ◽  
Sera Samples

The lithium ions concentration in human serum was determined using Dry-slide technology Vitros 250 Analyser (Ortho Clinical Diagnostic), atomic absorption spectrometry (AAS) method Perkin Elmer 403 and ion-selective electrode (ISE) potentiometry AVL 9181. We compared lithium ions results in sample sera between these methods. Our reference method was AAS. We analyzed lithium ions concentration in 23 sera samples of patients after oral administration of lithium carbonate (3x 300mg) Jadran, Galen Laboratory Rijeka, by dry-slide technology, AAS and ISE methods. The quality control, precision, reproducibility and accuracy for Vitros dry slide technology were assessed. We established that the main difference between AAS method and dry slide technology was not statistically significant at p< 0.05 according to Student t-test. Therefore, the dry slide technology may be a useful alternative or it may even replace other methods, such as AAS. The main difference between dry slide technology and ISE methods was statistically significant at p<0.05 using Student t-test. By ISE method, we obtained considerably higher results, which may be explained by the presence of electrolytes or medicaments interfering with lithium ions.

Risk assessment of human exposure to potentially toxic metals in indoor dust from some small and medium scale enterprise workplace environments in southern Nigeria

2019 ◽  
Vol 29 (8) ◽  
pp. 1137-1154
Author(s):  
Chukwujindu M.A. Iwegbue ◽  
Nnamdi Nwose ◽  
Francis E. Egobueze ◽  
Eze W. Odali ◽  
Godswill O. Tesi ◽  
...  
Keyword(s):  
Age Groups ◽  
Hazard Index ◽  
Absorption Spectrometry ◽  
Carcinogenic Risk ◽  
Printing Press ◽  
Indoor Dust ◽  
Potentially Toxic Metals ◽  
Spray Painting ◽  
Safe Level ◽  
Workplace Environments

This study concerns an assessment of indoor dust from printing press, car spray painting and metal design workshops, with the aim of evaluating the occupational risk arising from exposure to metals present in the dust. The levels of Cd, Pb, Cr, Ni, Cu, Co, Mn, Zn and Fe in the dust samples were quantified by means of atomic absorption spectrometry. The concentrations of metals (mg kg−1) in the indoor dust from these workplace environments varied from <0.003–208 for Cd, 26.5–1530 for Pb, 7.80–346 for Cr, 10.5–490 for Ni, 32.0–1915 for Cu, 3.50–232 for Co, 169–20,300 for Zn, 87.5–7260 for Mn and 8900–661,000 for Fe. The hazard index values were above one for different age groups except for the exposure of teenagers and adults to metals in dusts in the printing press studios and car spray painting workshops. The carcinogenic risk for all age groups relating to human contact with metals (Cd, Pb, Cr and Ni) in dust from these workplace environments via three exposure pathways: oral ingestion, inhalation and dermal contact, were above the safe level of 1.0 × 10−6 but not up to the level (1.0 × 10−4) that requires remedial action.

The effect of magnesium content on drilling of Al-Mg-Ti alloy by hole electrical discharge machining process

2020 ◽  
Vol 235 (1-2) ◽  
pp. 125-133
Author(s):  
Omer Eyercioglu ◽  
Kursad Gov
Keyword(s):  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Magnesium Content ◽  
Machining Process ◽  
Electrode Wear ◽  
Ti Alloy ◽  
Ti Alloys ◽  
Mg Content

This study presents an experimental investigation of small hole electrical discharge machining of Al-Mg-Ti alloys. A series of drilling operations were carried out for exploring the effect of magnesium content. Holes of 2 mm diameter and 15 mm depth were drilled using tubular single-hole rotary brass electrodes. The rates of material removal and electrode wear, surface roughness, overcut, average recast layer thickness, taper height and angle were studied for Al-Mg-Ti alloys contain 2%, 4%, 6%, 8%, 10%, 12%, and 14% Mg. The results show that the material removal rate is increasing with increasing Mg content while the rate of electrode wear is almost unchanged. Due to decreasing the melting temperature of the Al-Mg-Ti alloy with increasing Mg content, more metal melts and vaporizes during electrical discharge machining drilling. Therefore, more overcut and taper, thicker white layer, and rougher surfaces were measured for higher Mg content.

scholarly journals Magnesium content and net fluxes in squid giant axons.

1979 ◽  
Vol 74 (6) ◽  
pp. 739-752 ◽  
Author(s):  
M Caldwell-Violich ◽  
J Requena
Keyword(s):  
Atomic Absorption ◽  
Atomic Absorption Spectroscopy ◽  
Magnesium Content ◽  
Iodoacetic Acid ◽  
Half Time ◽  
Electrochemical Gradient ◽  
Carbonyl Cyanide ◽  
Mg Content ◽  
Mitochondrial Uncoupler ◽  
Net Fluxes

The Mg content of axons freshly dissected from living specimens of the tropical squid Doryteuthis plei was determined by atomic absorption spectroscopy to be 4.2 +/- 0.2 mmol/kg axoplasm. The axon's ability to maintain this physiological content of total intracellular Mg([Mg]i) was studied. Mgi was shown to be a linear function of Mgo when Mgo of incubating fluid was varied between 0 and 250 mM. When Mgo = 15 mM, Mgi was found to be the same in incubated fibers as in fibers freshly dissected. Mgi levels were unaffected by depolarization of the membrane by high Ko. Stimulation resulted in an extra influx of Mg of 0.05 pmol/(cm2 . impulse) when Mgo = 55 mM. Mgi was found to be a complicated function of the concentration of extracellular Na or Li (Xo), which was substituted for Tris. With 385 mM Lio the Mgi level was found to be 2.5-fold larger than the level observed with 385 mM Nao after incubation for 3 h. The function relating Mgo to Xo was qualitatively unaffected in axons poisoned with the mitochondrial uncoupler carbonyl cyanide, p-trifluorome-thoxy-phenylhydrazone (FCCP) and the inhibitor of glycolysis, iodoacetic acid (IAA); the absolute levels of Mgi, however, were some 30% higher in the poisoned axons at all [X]o explored. 2 h incubation of axons in a 333 mM Mg, 40 mM Li solution increased Mgi 3.5-fold in control axons and 5-fold in poisoned axons. These Mg-loaded axons were able to recover physiological levels of Mgi with a half-time of 3-5 h only if kept in a solution which contained Na (220 mM) regardless of whether the axons had been inhibited with FCCP + IAA. Therefore, it may be concluded that the physiological Mgi concentration can be maintained by the Na electrochemical gradient, even when the axon is metabolically poisoned.

scholarly journals A New Flame AAS Application for Magnesium Determination in Solid Pharmaceutical Preparations as an Active Ingredient and an Excipient

2020 ◽  
pp. 89-95
Author(s):  
Abdullah Sbahi ◽  
Wassim Abdelwahed ◽  
Amir Alhaj Sakur
Keyword(s):  
Active Ingredient ◽  
Pharmaceutical Preparations ◽  
Magnesium Content ◽  
Magnesium Stearate ◽  
Linear Range ◽  
Simultaneous Estimation ◽  
Aas Method ◽  
Drug Free ◽  
Digestion Methods ◽  
Total Magnesium

Objective: A new application of Atomic Absorption Spectroscopy (AAS) has been carried out to determine magnesium in its solid preparations (effervescent and uncoated compressed tablets) as an active ingredient and/or excipient. Methodology: The linear range of magnesium was determined. A sample of magnesium effervescent tablets was analyzed. Magnesium stearate concentration was also indirectly determined in commercial paracetamol tablets using two digestion methods. Finally, a sample of drug-free tablets (only contain excipients) was analyzed to study the effect of talc on total magnesium content of the sample. Results: Linear range was observed in concentrations between 0.08-0.40 ug/mL of magnesium. Effervescent tablets samples were recovered in the range between 98.66-103.00% which indicates that the product meets specifications.  For paracetamol tablets, the content of magnesium stearate was in average of 0.2% and there is no differences between the two digestion methods (t=0.454). Our work on the drug-free sample proved a significant increase of magnesium concentrations in the presence of talc. Conclusion: The AAS method is a simple and rapid technique that can be employed for the simultaneous estimation of magnesium in in-process and final products analyses.

scholarly journals Preparation of hydrogel reinforced with bentonite by gamma irradiation for metal absorption

2021 ◽  
Vol 10 (4) ◽  
pp. 48-55
Author(s):  
Tran To Uyen ◽  
Trinh Thi Tu Anh ◽  
Tamikazu Kume ◽  
Cao Dong Vu ◽  
Nguyen Minh Hiep ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Adsorption Process ◽  
Absorption Spectrometry ◽  
Order Model ◽  
Adsorption Capacities ◽  
Dose Concentration ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Aas Method ◽  
Irradiation Technology

A natural-based sodium carboxymethyl cellulose (CMC) hydrogel reinforced with bentonite was prepared by using gamma irradiation technology. This is a novel hydrogel that uses natural polymer to absorb metal ions in wastewater. The influence of dose, concentration of CMC and bentonite on the sorption of hydrogels was investigated by atomic absorption spectrometry (AAS) method. According to the Langmuir isotherm model, the maximum adsorption capacities of CMC/bentonite hydrogel for Cu2+ and Pb2+ were 181.82 mg/g and 204.08 mg/g at room temperature, respectively. The pseudo-second-order model which describes the adsorption process of Cu2+ and Pb2+ was also studied

Production of Mg-Based Bulk Metallic Glass Composites with High Magnesium Content

2013 ◽  
Vol 773-774 ◽  
pp. 263-267
Author(s):  
Olga Biletska ◽  
Kevin J. Laws ◽  
Mark Gibson ◽  
Michael Ferry
Keyword(s):  
Amorphous Matrix ◽  
Volume Fraction ◽  
Deformation Behaviour ◽  
Magnesium Content ◽  
Glass Composites ◽  
Bulk Metallic Glass Composites ◽  
Injection Casting ◽  
Mg Content ◽  
Copper Mould

In this work, in-situ BMG composites based on the Mg-Ni-Gd system with high Mg content (>80 at. %) were produced by copper mould gravity and injection casting methods. The morphology, distribution and volume fraction of the crystalline phases that form in the amorphous matrix was shown to be influenced by cooling rate, composition and casting parameters. Hence, the mechanical properties and deformation behaviour of Mg-Ni-RE BMG composites can be tailored by controlling the microstructure generated during casting.

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