scholarly journals THE DETERMINATION OF THE CALCIUM, MAGNESIUM, AND ACID-SOLUBLE PHOSPHORUS OF MILK BY MEANS OF TRICHLOROACETIC ACID FILTRATES

1931 ◽  
Vol 90 (3) ◽  
pp. 747-756
Author(s):  
George P. Sanders
Keyword(s):  
Trichloroacetic Acid ◽  
Soluble Phosphorus ◽  
Calcium Magnesium

Adolescent athletes and nutrition – analysis of two groups of children

2020 ◽  
pp. 1-6
Author(s):  
Tatyana Dzimbova
Keyword(s):  
Energy Expenditure ◽  
Energy Intake ◽  
Eating Habits ◽  
Energy Deficit ◽  
Young Athletes ◽  
Adolescent Athletes ◽  
Basketball Players ◽  
Calcium Magnesium ◽  
The Right

Introduction. Proper nutrition is crucial for child and adolescent athletes to maintain growth and development and to achieveoptimal results in sports. It is very important to balance the energy expenditure with the energy intake in order to prevent the energy deficit or excess.Materials and methods. Subjects involved in two different sports participated in the study: 13 gymnasts (age 13.8 ± 4.1 years, height 153.4 ± 11.3 cm, weight 47.1 ± 10.5 kg) and 15 basketball players (age 15.5 ± 1.1 years, height 176.7 ± 7.9 cm, weight 65.2 ± 10.7 kg). Determination of total energy expenditure was made by prediction equations. The subjects maintained a food records for 5 consecutive days, which were processed in the ASA24 system of the NCI. Results and discussion. Energy intake in both groups is sufficient to meet the daily needs, development of young athletes andprovide the energy needed in training. The intake of three minerals (calcium, magnesium and potassium) and three vitamins (D, E and A) was lower than recommended values in both groups.Conclusion. As a result of the busy schedule of adolescent athletes, their main meals are out of home, and the proportion of highly processed foods containing small amounts of important vitamins and minerals is high. The main recommendations include dairy products, fruits, vegetables and whole grains. The idea behind the changes is to give young athletes the right diet and the right eating habits.

Quantitative determination of calcium, magnesium, and zinc in fingernails by laser-induced breakdown spectroscopy

Talanta ◽  
2013 ◽  
Vol 117 ◽  
pp. 55-59 ◽  
Author(s):  
David A. Rusak ◽  
Ann E. Zeleniak ◽  
Jillian L. Obuhosky ◽  
Scott M. Holdren ◽  
Craig A. Noldy
Keyword(s):  
Quantitative Determination ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Calcium Magnesium

A New Volumetric Method for the Estimation of Sodium

1930 ◽  
Vol 20 (4) ◽  
pp. 511-516 ◽  
Author(s):  
A. Blenkinsop
Keyword(s):  
Sodium Acetate ◽  
Volumetric Method ◽  
Chemical Reagents ◽  
Mixed Solutions ◽  
Calcium Magnesium

1. A volumetric method for the determination of sodium which can be separated as a triple salt (uranium zinc sodium acetate) from mixed solutions is described. The reduction of the uranium with titanous chloride, upon which it depends is shown to be quantitative.2. Calcium, magnesium, and relatively large proportions of potash do not interfere. The procedure for the removal of iron, aluminium and phosphates by gentle ignition is simple and obviates the risk of error by the introduction of sodium as an impurity in the chemical reagents necessary for precipitation methods.3. 0.1 mg. of sodium can be determined accurately.

Nitrogen enrichment of animal bone-derived biochars as an agricultural NP-fertilizer 

2021 ◽  
Author(s):  
Gerhard Soja ◽  
Dominik Tauber ◽  
Jan Höllrigl ◽  
Andrea Mayer ◽  
Christoph Pfeifer
Keyword(s):  
Phosphorus Content ◽  
Water Soluble ◽  
Meat Production ◽  
Colorimetric Determination ◽  
Animal Bone ◽  
Soluble Phosphorus ◽  
Sorption Potential ◽  
P Supply ◽  
Np Fertilizer

<p>Food processing creates many by-products, and not all of them are used efficiently. Especially animal-based side products are frequently considered as waste with costly disposal requirements. For recycling of the nutrients contained in these residues, also under consideration of the hygienic specifications, pyrolysis can be used to create animal bone-based biochars. A lab-scale pyrolysis reactor (Pyreka 3.0) was used to produce biochars from different bone fractions of cattle and pigs after these bones had originated as waste from abbatoir operations. This study had the objective to investigate the potential of the bone chars to serve as a phosphorus (P) supply for agricultural purposes and to study the ammonium sorption potential of these chars.</p><p>The total phosphorus content of bones reached up to 140 mg/g. The water-soluble phosphorus content was in the range of 0.16 – 0.93 mg/g, an increase in pyrolysis temperature from 350 °C to 500 °C or 650 °C increased the water-soluble content by 13.3 or 12.2 % respectively. The citric acid soluble phosphorus content was between 1.75 – 2.19 mg/g. After pyrolysis temperatures of 350 °C, slightly more phosphorus dissolved in the coal products than at 500 °C (+2.7 %) and at 650 °C (+5.5 %).</p><p>The ammonium sorption capacity of biochars produced by varying pyrolytic processes was investigated by a series of sorption experiments. The removal of ammonium by the biochars from an aqueous ammonium solution was measured by using colorimetric determination of the ammonium content. The maximum ammonium sorption results were achieved by biochars produced from bovine heads and feet respectively at a temperature of 900°C and activated with H<sub>2</sub>O.</p><p>When exposed to a solution containing 50 mg/L of ammonium, these biochars adsorbed 1.23 and 1.14 mg ammonium/g biochar, respectively. The possibility to enrich abattoir waste biochars, which are depleted in nitrogen because of the pyrolysis process, with ammonium gained from a nitrogen-enriched biogas slurry produced from animal residues of the meat production process was tested using a substitute slurry made with ammonium sulfate. The highest absorbance rate using the substitute slurry containing 10 g/L ammonium was achieved by biochar made from bovine heads and resulted in 43.1 mg ammonium/g biochar.</p><p>This study shows that bone-based biochars enriched with nitrogen from e.g. biogas digestates have significant potential as an NP-fertilizer that supports the strategies of circular economy.</p>

An Improved Enzymatic-Ultraviolet Method for Determination of Uric Acid in Flours

1966 ◽  
Vol 49 (5) ◽  
pp. 899-902
Author(s):  
N P Sen ◽  
D Morison Smith
Keyword(s):  
Uric Acid ◽  
Trichloroacetic Acid ◽  
Cereal Products

Abstract Main improvements in the enzymaticultraviolet method for uric acid in flours include elimination of the uricase precipitation by trichloroacetic acid, which was not reproducible, and destruction of uricaselike material in flour before extraction. The method is capable of measuring as low as 3.2 mg uric acid per 100 g flour and is applicable to a variety of cereal products such as rice, rye, corn and soya flours, as well as barley, oats, etc.

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