Determination of Relationship between Chemical Composition of Electrolyte and Surface Sample Quality

2015 ◽  
Vol 669 ◽  
pp. 150-157
Author(s):  
Peter Michal ◽  
Alena Vagaská ◽  
Miroslav Gombár
Keyword(s):  
Sodium Chloride ◽  
Chemical Composition ◽  
Oxalic Acid ◽  
Boric Acid ◽  
Oxide Layer ◽  
Surface Finish ◽  
Chemical Factors ◽  
Substrate Sample

Paper tracks experimentally confirmed relationship between chemical composition of electrolyte and resulting surface finish quality of created oxide layer during the process of anodic oxidation of aluminium. Examined chemical factors were: concentrations of sulphuric acid, oxalic acid, boric acid and sodium chloride. Aggressive effects of electrolyte were chosen as indicator of resulting layer quality – presence and extent of etching of used substrate sample.

The Influence of Sodium Chloride on the Resulting AAO Film Thickness

2013 ◽  
Vol 816-817 ◽  
pp. 18-22 ◽  
Author(s):  
Miroslav Badida ◽  
Miroslav Gombar ◽  
Lydia Sobotova ◽  
Jan Kmec ◽  
Alena Vagaská ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sodium Chloride ◽  
Chemical Composition ◽  
Oxalic Acid ◽  
Film Thickness ◽  
Boric Acid ◽  
Oxide Layer ◽  
Applied Voltage ◽  
Crucial Role ◽  
Electrolyte Temperature

The contribution examines the effects of the electrolyte chemical composition on the resulting AAO layer thickness, which is one of the main indicators of corrosion protection of aluminium parts and which also favourably affects mechanical properties of component surfaces. For comparison purposes, there were selected the electrolytes comprising sulphuric acid, oxalic acid, boric acid and sodium chloride. Anodizing time for all specimens was 210.00 minutes. At the same time, equal electrolyte temperature 22.00°C ± 13.64% as well as equal magnitude of the applied voltage 12.00 V ± 4.17% were determined for all specimens. The results obtained lead to the assumption that it is possible to replace conventional electrolytes by those that are more environmentally friendly, reduce the costs of their disposal and allow obtaining oxide layers of the same thickness. The admixture of sodium chloride plays here the crucial role and its effect on the thickness of the formed oxide layer has not been published yet in any study.

scholarly journals Influence of stress conditions on the quality of obtained sprouts – modification of their chemical composition

2021 ◽  
Vol 13 (2) ◽  
pp. 1-12
Author(s):  
Magdalena Zielińska-Dawidziak
Keyword(s):  
Chemical Composition ◽  
Secondary Metabolites ◽  
Metal Ions ◽  
Nutritional Quality ◽  
Growth Conditions ◽  
Stress Conditions ◽  
Light Illumination ◽  
Health Promoting ◽  
Chemical Factors

Sprouts are generally accepted as a pro-healthy food. They are consumed as a source of valuable macronutrients, antioxidants, microelements, and vitamins. Changing growth conditions of sprouts enables modification of their nutritional quality, as well as their safety. Thus, in order to achieve the most desirable composition of the produced sprouts, the conditions for their production are optimized. The aim of this review is to present methods currently used to modify the nutritional quality of plant sprouts. Most scientific works focus on stress conditions inducing the synthesis of secondary metabolites, mainly antioxidants. An increase in their content is achieved after application of physical (e.g., light illumination, temperature) or chemical factors (e.g., salinity stress, phytohormones, metal ions, etc). Though the application of these modifications on a larger scale is problematic. These problems include difficulties in predicting the effect of the stressor and an increased price of the obtained sprouts. However, since it is possible to enrich sprouts with valuable health-promoting substances, these methods are still considered very promising.

Determination of Quality and Chemical Composition of Silages Obtained from Narbonne Vetch (Vicia narbonensis) and Barley (Hordeum vulgare) Composition

2020 ◽  
Author(s):  
Nizamettin Turan
Keyword(s):  
Chemical Composition ◽  
Hordeum Vulgare ◽  
Crude Protein ◽  
Dry Matter ◽  
Neutral Detergent Fiber ◽  
Hordeum Vulgare L ◽  
Vicia Narbonensis ◽  
Feed Value

Research was conducted to determine the quality and chemical composition of silages obtained by mixing in different ratios of narbonne vetch (Vicia narbonensis L.) and barley (Hordeum vulgare L.) grown in rabi season of 2017-2018 in Eastern Anatolia, Turkey. In the study we studied the pure sowings of barley and narbonne vetch and their mixtures (20, 30, 40, 50, 60, 70, 80% of narbonne vetch (N) + 80, 70, 60, 50, 40, 30, 20% of barley (B). The values of ADF (acid detergent fiber), NDF (neutral detergent fiber), DDM (digestible dry matter), DMI (dry matter intake), DM (dry matter), CP (crude protein) and RFV (relative feed value) of silages of analyzed were respectively 33.38, 33.73, 62.89, 3.57, 24.69, 15.50%, 174.64. We also founded that LA (lactic acid), AA (acetic acid), BA (butyric acid), PA (propionic acid) and Ca, P, Mg, K and pH of silages investigated were respectively 1.60, 0.57, 0.42, 0.06, 1.17, 0.53, 0.25, 3.51% and 3.80. Our results shows that silages with high narbonne vetch were higher quality values for CP, ADF, NDF, DM, RFV, DDM, DMI, Ca, Mg, LA which determined chemical composition and feeding quality of silages. As a result, it is suggested that mixture silages with narbonne vetch (80%) and the barley ratio (20%) have important advantages for some properties of silages.

scholarly journals Determination of the comprehensive indicator of pastille with the use of multi-component fruit-berry paste

2021 ◽  
Vol 3 (3(59)) ◽  
pp. 46-49
Author(s):  
Kateryna Kasabova ◽  
Nataliа Shmatchenko ◽  
Aleksey Zagorulko ◽  
Andreii Zahorulko
Keyword(s):  
Ascorbic Acid ◽  
Chemical Composition ◽  
Raw Materials ◽  
Control Sample ◽  
Comprehensive Assessment ◽  
Biologically Active ◽  
Human Need ◽  
Pectin Substances

The object of research in this work is the technology of pastille with the addition of multicomponent fruit and berry paste. Pastille are becoming more and more popular in the world for all segments of the population. Usually, the main ingredients for their manufacture are fruit raw materials, a structurant and egg white, therefore, the products contain practically no fat and have a low calorie content. It is proposed to replace 75 % of traditional applesauce in the recipe with a multicomponent fruit and berry paste made from apples, cranberries, hawthorn. It was found that such a composition makes it possible to obtain products with an increased content of pectin substances, ascorbic acid, polyphenols, including anthocyanins, catechins and flavonols. The work is aimed at studying the application of the principles of qualimetry to determine a complex indicator of the quality of pastille For this, the organoleptic and physicochemical indicators of the quality of the developed pastille were taken from previous studies and the chemical composition was determined and the content of biologically active substances was calculated relative to the average daily human need. The content of pectin substances in new products increases 1.7 times and satisfies the average daily human need by 18.2 %. The content of ascorbic acid is 4.2 times higher, which is 20.5 % of the average daily human need, and polyphenols 3.2 times higher – 579.0 %. The data obtained make it possible to consider the developed product functional. The next step was to determine the complex indicator of products by the qualimetric method. For a more complete disclosure of product properties, a structure of pastille quality indicators has been developed – a «tree of properties». Thus, the comprehensive assessment of the quality of the control sample corresponds to the indicator «good» (0.66), while the integrated assessment of pastille with multicomponent paste corresponds to the indicator «very good» (0.98). On the basis of organoleptic, physicochemical indicators and chemical composition of products, it was established that the indicator of a comprehensive assessment of the quality of a pastille with a multicomponent paste, taking into account all group indicators, is 48 % higher compared to the control.

scholarly journals Chemical Composition and Plant Growth of Centaurea raphanina subsp. mixta Plants Cultivated under Saline Conditions

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2204 ◽  
Author(s):  
Spyridon A. Petropoulos ◽  
Ângela Fernandes ◽  
Maria Ines Dias ◽  
Carla Pereira ◽  
Ricardo C. Calhelha ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Plant Growth ◽  
Oxalic Acid ◽  
Nutritional Value ◽  
Trichoderma Viride ◽  
Antimicrobial Properties ◽  
Growth And Yield ◽  
Control Treatment ◽  
Harvest Time

The aim of this report was to study the effect of salinity (control: 2dS/m, S1: 4 dS/m and S2: 6 dS/m) and harvest time (first harvest on 9 May 2018 and second harvest on 19 April 2018) on the growth and the chemical composition of Centaurea raphanina subsp. mixta plants. The plants of the first harvest were used for the plant growth measurements (fresh weight and moisture content of leaves, rosette diameter, number and thickness of leaves), whereas those of the second harvest were not used for these measurements due to the flowering initiation, which made the leaves unmarketable due to their hard texture. The results of our study showed that C. raphanina subsp. mixta plants can be cultivated under mild salinity (S1 treatment) conditions without severe effects on plant growth and yield, since a more severe loss (27.5%) was observed for the S2 treatment. In addition, harvest time proved to be a cost-effective cultivation practice that allows to regulate the quality of the final product, either in edible form (first harvest) or for nutraceutical and pharmaceutical purposes as well as antimicrobial agents in food products. Therefore, the combination of these two agronomic factors showed interesting results in terms of the quality of the final product. In particular, high salinity (S2 treatment) improved the nutritional value by increasing the fat, proteins and carbohydrates contents in the first harvest, as well as the tocopherols and sugars contents (S1 and S2 treatments, respectively) in the second harvest. In addition, salinity and harvest time affected the oxalic acid content which was the lowest for the S2 treatment at the second harvest. Similarly, the richest fatty acid (α-linolenic acid) increased with increasing salinity at the first harvest. Salinity and harvest time also affected the antimicrobial properties, especially against Staphylococcus aureus, Bacillus cereus and Trichoderma viride, where the extracts from the S1 and S2 treatments showed high effectiveness. In contrast, the highest amounts of flavanones (pinocembrin derivatives) were detected in the control treatment (second harvest), which was also reflected to the highest antioxidant activity (TBARS) for the same treatment. In conclusion, C. raphanina subsp. mixta plants seem to be tolerant to medium salinity stress (S1 treatment) since plant growth was not severely impaired, while salinity and harvesting time affected the nutritional value (fat, proteins, and carbohydrates) and the chemical composition (tocopherols, sugars, oxalic acid, fatty acids), as well as the bioactive properties (cytotoxicity and antimicrobial properties) of the final product.

scholarly journals Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Forests ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1649
Author(s):  
Túlio Anselmo Sacramento Vieira ◽  
Taiana Guimarães Arriel ◽  
Antônio José Vinha Zanuncio ◽  
Amélia Guimarães Carvalho ◽  
Monique Branco-Vieira ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Lignin Content ◽  
Polar Compounds ◽  
Raw Material ◽  
Alkanoic Acids ◽  
Main Components ◽  
Cellulosic Pulp ◽  
Pulp Production

The chemical composition of wood is important to assess the quality of this raw material for the industry of cellulosic pulp production. The purpose of this work was to determine the chemical composition of Eucalyptus spp. grown for cellulosic pulp production. Ten Eucalyptus spp. clones with six years of age, located in the municipality of Itamarandiba, Minas Gerais, Brazil, were used. Quantification was obtained for extractives, monosaccharides, uronic acids, acetates, lignin, ash and the phenolic composition of the extracts. In average, clones showed around 2.7% extractives, with a predominance of polar compounds soluble in ethanol and water; 27.7% lignin and 0.3% ash. Glucose was the main sugar detected (64.2%), followed by xylose (19.3%). The main components of the extractives were steroids, fatty acids and aromatic acids, followed by smaller amounts of substituted alkanoic acids, fatty alcohols, glycerol derivatives and triterpenes. The ethanol–water extracts presented total phenol contents ranging from 321.4 to 586.6 mg EAG/g of extract, tannins from 28.1 to 65.1 mg catechin/g of extract and flavonoids from 73.6 to 256.9 mg catechin/g of extract. Clones with a higher holocellulose amount and a lower lignin content showed a higher potential for cellulosic pulp production. These findings are important for the development of high-quality wood based on important traits for the pulp and paper sector.

Determination of Chemical Composition, Mineral Contents, and Protein Quality of Iranian Kilka Fish Meal

2007 ◽  
Vol 6 (5) ◽  
pp. 354-361 ◽  
Author(s):  
Hassan Nassiri Moghaddam ◽  
Mohsen Danesh Mesgaran ◽  
Hossein Jahanian Najafabadi ◽  
Rahman Jahanian Najafabadi
Keyword(s):  
Chemical Composition ◽  
Fish Meal ◽  
Protein Quality ◽  
Mineral Contents

Improving the method of determining the mass fraction of magnesium carbonate and the study of the chemical composition of carbonate rocks for the effective conduct of the technological process of sugar production

10.5219/1620 ◽  
2021 ◽  
Vol 15 ◽  
pp. 901-916
Author(s):  
Tatiana Kos ◽  
Inha Kuznietsova ◽  
Tamila Sheiko ◽  
Liubomyr Khomichak ◽  
Larysa Bal-Prylypko ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Technological Process ◽  
Carbonate Rock ◽  
Material Balance ◽  
Component Composition ◽  
Magnesium Carbonate ◽  
Real Component ◽  
Lime Kiln

The article considers an improved method for determining the content of magnesium carbonate in the carbonate rock. An adjusted method for determining the content of magnesium carbonate was included in the complete establishment of chemical analysis of limestone, which includes the determination of moisture, impurities insoluble in hydrochloric acid, the amount of one and a half oxides of aluminum and iron, calcium carbonate and magnesium carbonate (advanced method), calcium sulfate, alkali metal oxides of potassium and sodium. The obtained experimental data were entered into a single table and summed up the material balance of all components of the carbonate rock. As a result, it was found that this technique includes the following criteria: it is the most accurate, most accessible, and cheap. The use of adjusted methods for determining the content of calcium and magnesium carbonate in limestone will make it possible to establish the objective chemical composition of the carbonate rock and avoid several technological problems. Namely, the excess of uncontrolled magnesium carbonate contributes to the formation of the liquid phase, which in turn reduces the concentration of chemically active lime and promotes the formation of melts in the lime kiln, deteriorating filtration rates, clogging the evaporating station, and so on. Therefore, having information about the real component composition of limestone, the technologist will be able to adjust the technological process in advance, which will lead to the preservation of natural resources while the quality of finished products will not decrease.

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