scholarly journals Характеристика сучасних методів визначення сирого протеїну у кормах та рослинній сировині

2017 ◽  
Vol 19 (82) ◽  
pp. 97-100
Author(s):  
G.V. Kuchnir ◽  
Т.R. Levytzkiy ◽  
G.P. Ryvak ◽  
L.V. Kurylas ◽  
O.M. Vilha ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Toxic Chemicals ◽  
Infrared Spectrometry ◽  
Laboratory Practice ◽  
Plant Materials ◽  
Modern Methods ◽  
Kjeldahl Method ◽  
The One ◽  
No Sample Preparation

Todays in laboratory and manufacturing practice of veterinary medicine of Ukraine, for the detertimations of raw protein in feed and in plant raw are used as classic and as modern methods depending from the aim and the task of research. Thats why the article describes the modern methods of the determination of content of nitrogen and the calculation of raw protein in feeds for animals and in plant materials, in particular, photometric, classical – Kjeldahl method, modern – Dumas and spectrometric methods (the method of infrared spectrometry in the near range (NIR-spectrometry). Despite of the facts, that the Kjeldahl method remains generally accepted in the determination of the protein and is most often used in research, but the modern methods – the Dumas method and NIR-spectrometry are widely adopted in laboratory practice. The main advantage of these methods is the speed of the analysis (the one definition takes only a few minutes), practically there is no sample preparation, and the most important is that the toxic chemicals and catalysts are not used.Thus, despite the fact that the Kjeldahl method remains generally accepted in the determination of the protein, and it is most frequently used in research, but modern methods, the Dumas method and NIR-spectrometry, are widely implemented in laboratory practice. The main advantage of these methods is the speed of conducting the analysis (one definition only takes a few minutes), there is practically no sample preparation, and most importantly, toxic chemicals and catalysts are not used. 

Determination of Six Common Phthalate Plasticizers in Grain Neutral Spirits and Vodka

1995 ◽  
Vol 78 (3) ◽  
pp. 730-735 ◽  
Author(s):  
Jeffrey N Leebowitz ◽  
Rafael Sarmiento ◽  
Sumer M Dugar ◽  
Michael W Ethridge
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Liquid Chromatography ◽  
Sample Preparation ◽  
Sample Injection ◽  
Sample Enrichment ◽  
Injection Methods ◽  
No Sample Preparation ◽  
Direct Sample

Abstract Two direct sample injection methods using liquid chromatography (LC) and gas chromatography coupled with mass spectrometry (GC/MS) were used to determine phthalate residues in grain neutral spirits and vodka. Six reported phthalates were quantitated at concentrations as low as 20 μg/L (20 ppb) with no sample preparation or sample enrichment.

scholarly journals Research on Protein Content and Total Nitrogen and a Cob of Maize Strains by FT-NIR Spectrometry

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Ioan ROTAR ◽  
Laura Monica DALE ◽  
Roxana VIDICAN ◽  
Alin Mogos ◽  
Ovidiu Ceclan
Keyword(s):  
Total Nitrogen ◽  
Agricultural Development ◽  
Near Infrared ◽  
Direct Analysis ◽  
Infrared Spectrometry ◽  
Physico Chemical ◽  
Kjeldahl Method ◽  
Near Infrared Spectrometry ◽  
Maize Stalks

Using Near Infrared Spectrometry has become lately quite a developed technique in the different physico-chemical parameters of the feed as a procedure is extremely elegant and precise use. This paper aims to highlight a way of direct analysis method undestructive protein and total nitrogen using near infrared spectrometry in conjunction with reflected attenuated total. Tests were conducted on samples of maize cob and maize stalks from The Research - Agricultural Development Turda. Samples done at each variant separately. Each sample was subjected to destructive method calculations: Kjeldahl method for determinating the protein, and then collected with NIR spectrum. We have built mathematical models for both the cob and stalks, based on these techniques and multivariated analysis allows the determination of an error prediction for the best protein 0.5% and the total nitrogen of 0.1%.

Rapid Instrumental Fat Determination

1970 ◽  
Vol 53 (5) ◽  
pp. 1080-1081
Author(s):  
A J Malanoski ◽  
E L Greenfield
Keyword(s):  
Specific Gravity ◽  
Sample Preparation ◽  
Screening Tool ◽  
Automatic Computation ◽  
Automated Method ◽  
Aoac Method ◽  
No Sample Preparation ◽  
Plant Control

Abstract The Digital Fat Controller was evaluated for use in plant control and as a screening tool. The determination of fat by the Digital Fat Controller utilizes specific gravity with automatic computation and a “nixie” tube readout. No sample preparation is required and an analysis can be completed in 30–60 sec. Fiftysix samples were analyzed by both the automated method and the official AOAC method.

Chemiluminescence Detection of Nitrite in Nonfat Dried Milk Powders

1982 ◽  
Vol 65 (3) ◽  
pp. 616-618
Author(s):  
Robert C Doerr ◽  
Robert A Gates ◽  
Walter Fiddler
Keyword(s):  
Statistical Analysis ◽  
Sample Preparation ◽  
Colorimetric Method ◽  
Chemiluminescence Detection ◽  
Milk Samples ◽  
Dry Milk ◽  
Nonfat Dry Milk ◽  
No Sample Preparation

Abstract Determination of nitrite in nonfat dry milk powders by chemiluminescence detection was compared with a colorimetric method specifying Griess reagents. The chemiluminescent technique requires no sample preparation, is free from apparent interferences, and is sensitive to 25 ppb nitrite. Statistical analysis shows no difference at P = 0.05 between the colorimetric and chemiluminescent methods, based on the analysis of 16 commercial nonfat dry milk samples.

Use of alumina columns to prepare plasma samples for liquid-chromatographic determination of catecholamines.

1987 ◽  
Vol 33 (2) ◽  
pp. 286-287 ◽  
Author(s):  
P F Maycock ◽  
K N Frayn
Keyword(s):  
Sample Preparation ◽  
Extraction Method ◽  
Plasma Catecholamines ◽  
Chromatographic Determination ◽  
Plasma Samples ◽  
Improved Method ◽  
Liquid Chromatographic Determination ◽  
The One ◽  
Liquid Chromatographic

Abstract We describe an improved method of sample preparation for liquid chromatographic determination of plasma catecholamines. The catecholamines are extracted from plasma by using small, cheaply-made columns of alumina, with or without prior clean-up on commercially available ion-exchange columns. Advantages of this technique over the conventional batch-extraction method of using alumina are speed, convenience, and improved sample clean-up. In particular, the one-stage method we describe allows results to be reported within 20 min of receiving the sample.

scholarly journals ATOMIC-ABSORPTION AND ATOMIC-EMISSION WITH INDUCTIVE CONNECTED PLASMA DETERMINATION OF THE ANALYTS IN OIL PRODUCTS WITH USE OF MODERN METHODS OF SAMPLE PREPARATION AND NEW STANDARD COMPOSITION SAMPLES

2018 ◽  
Vol 62 (06) ◽  
pp. 11-15
Author(s):  
Oleg Ivanovych Yurchenko ◽  
◽  
Nadegda Petrovna Titova ◽  
Tetyana Vasylivna Chernozhuk ◽  
Oleksii Andriovych Kravchenko ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Atomic Absorption ◽  
Atomic Emission ◽  
Oil Products ◽  
Modern Methods ◽  
Standard Composition

scholarly journals Sunflower Halva with Addition of Hemp Protein Powder I. Determination of Protein Content

2011 ◽  
Vol 68 (2) ◽  
Author(s):  
Emil RACOLTA ◽  
Crina MURESAN ◽  
Vlad MURESAN ◽  
Livia TICREA
Keyword(s):  
Fatty Acid ◽  
Protein Content ◽  
Fatty Acid Profile ◽  
Manufacturing Process ◽  
Oil Quality ◽  
Kjeldahl Method ◽  
The One ◽  
A Current ◽  
Confectionery Product

The aim of the paper was to obtain a new confectionery product, with added hemp protein powder, the protein content of the final product being determined. Hemp protein powder was added in order to improve oil quality, fatty acid profile (ω-3, ω-6 addition) and to increase the protein content. Protein content is not a current determination in the manufacturing process of traditional halva; in this paper the protein content of traditional sunflower halva and of the one improved with hemp protein powder was determined by Kjeldahl method. The determination allowed a better understanding regarding protein content of both types of halva.

scholarly journals Voltammetric Determination of Anethole on La2O3/CPE and BDDE

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Mateusz Kowalcze ◽  
Jan Wyrwa ◽  
Małgorzata Dziubaniuk ◽  
Małgorzata Jakubowska
Keyword(s):  
Detection Limit ◽  
Essential Oil ◽  
Sample Preparation ◽  
Cyclic Voltammograms ◽  
Structure And Properties ◽  
Ethanol Extracts ◽  
First Time ◽  
Herbal Mixtures ◽  
No Sample Preparation

In this work, DPV determination of anethole was presented using various carbon, two-diameter (1.5 and 3 mm) electrodes, that is, BDD, GC, CP, and CP doped by La2O3 and CeO2 nanoparticles. La2O3/CPE to our best knowledge was proposed first time. Cyclic voltammograms confirmed totally irreversible electrode electrooxidation process, controlled by diffusion, in which two electrons take part. The most satisfactory sensitivity 0.885 ± 0.016 µA/mg L−1 in 0.1 mol L−1 acetate buffer was obtained for La2O3/CPE with the correlation coefficient r of 0.9993, while for BDDE it was 0.135 ± 0.003 µA/mg L−1 with r of 0.9990. The lowest detection limit of 0.004 mg L−1 was reached on La2O3/CPE (3 mm), what may be compared with the most sensitive conjugate methods, but in the proposed approach, no sample preparation and analyte separation was needed. Anethole was successfully determined in specially prepared ethanol extracts of herbal mixtures of various compositions, which imitated real products. The proposed procedure was verified in analysis of commercial products, that is, anise essential oil, which contains a large concentration of anethole, and in alcohol drinks like Metaxa, Ouzo, and Rakija, in which the considered analyte occurs on trace levels. Structure and properties of the considered nanopowders and graphite pastes were investigated by EDX, SEM, and EIS.

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