Development of methodical approaches to assessing the formation of rennet-induced milk gels using the method of rotational viscometry

2021 ◽  
pp. 58-60
Author(s):  
Александр Геннадьевич Кручинин ◽  
Елена Анатольевна Юрова ◽  
Светлана Николаевна Туровская ◽  
Елена Евгеньевна Илларионова
Keyword(s):  
Comparative Assessment ◽  
Rheological Parameters ◽  
Milk Clotting ◽  
Gelation Kinetics ◽  
Rotational Viscometry ◽  
Rennet Coagulation ◽  
Methodological Approaches ◽  
Milk Coagulation ◽  
Temperature Time ◽  
Selection Of

Формирование структуры сычужно-индуцированных молочных гелей, имеющее первостепенное значение в производстве целого ряда продуктов, наиболее объективно может быть охарактеризовано исключительно посредством инструментального измерения реологических параметров. В статье представлены результаты эксперимента по определению способности молочных систем с различной концентрацией сухих веществ к сычужному свертыванию с использованием ротационной вискозиметрии. Метод базируется на анализе изменений динамических показателей вязкости в процессе коагуляции молока, а также его УФ- и НФ-ретентатов с использованием вискозиметра Brookfield с последующей сравнительной графической оценкой кинетики гелеобразования и пиковой вязкости образующихся сгустков. Полученные данные подтвердили эффективность предлагаемых методических подходов для сравнительной оценки способности к сычужной коагуляции молока и его концентратов, полученных разными способами баромембранной обработки, и выявили перспективные направления исследований по изучению активности и дозировок молокосвертывающих препаратов, а также по выбору оптимальных температурно-временных режимов сычужной коагуляции молочных систем с прогнозированием их структурно-механических параметров. Rennet-induced milk gels are crucial for the production of a number of products. The formation of their structure can be objectively characterized only with the use of instrumental measurements of rheological parameters. The article presents the results of the experiment on determining the ability of milk systems with different dry substances concentration to rennet clot using rotational viscometry. This method is based on the analysis of changes in the dynamic viscosity indicators during the milk coagulation and its UV and NF retentates, followed by a comparative graphical assessment of the gelation kinetics and maximum clots viscosity. In our experiment, we used Brookfield viscometer. The presented data confirmed the effectiveness of the proposed methodological approaches for the comparative assessment of the ability to rennet coagulation of milk and its concentrates obtained by different methods of baromembrane treatment. A great prospect has been obtained in studies on the study of the activity and doses of milk-clotting enzymes and, the selection of the optimal temperature-time regimes of rennet clotting of milk systems with the prediction of their structural and mechanical parameters.

Milk coagulation by cationic polyelectrolytes

1981 ◽  
Vol 48 (2) ◽  
pp. 267-271 ◽  
Author(s):  
Francesco Di Gregorio ◽  
Raffaello Sisto
Keyword(s):  
Aqueous Solution ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Milk Clotting ◽  
Rennet Coagulation ◽  
Milk Coagulation ◽  
Cationic Polyelectrolytes ◽  
Positively Charged

SummaryPositively charged materials, polyethyleneimine, poly-L-lysine and partly estcrified proteins (i.e. methyl bovine serum albumin, methyl casein and ethyl casein), in aqueous solution at the natural pH of milk, caused milk coagulation. This occurred at pH 6–6·7 at ≤ 30 °C using a defined amount of coagulant, which was quantitatively recovered in the curd. The protein and fat recovery yields were higher than with acid and rennet coagulation; the (Ca + Mg) partition between whey and curd was very similar to rennet milk clotting: the curd obtained showed high syneresis rate.

CRITERIONS FOR THE EFFECTIVENESS OF SOCIALLY IMPORTANT INVESTMENT PROJECTS AND THEIR FORMULAS ADOPTED IN RUSSIAN PRACTICE

2020 ◽  
Vol 2 (8) ◽  
pp. 58-64
Author(s):  
A. F. AGEEVA ◽  
Keyword(s):  
Performance Indicators ◽  
Payback Period ◽  
Internal Rate Of Return ◽  
Investment Projects ◽  
Regulatory Documents ◽  
Project Analysis ◽  
Analytical Work ◽  
Methodological Approaches ◽  
Further Development ◽  
Selection Of

The article analyzes domestic guidelines for assessing the effectiveness of investment projects reflected in the regulatory documentation, both current and invalid. Considered are methodological approaches to calculating key performance indicators of investment projects - net discounted income, internal rate of return, discounted payback period and profitability index. The results of the analysis and recommendations for the further development of national regulatory documents for project analysis and methodological approaches to assessing the effectiveness of socially significant investment projects are presented. The results of the analytical work presented in the article are planned to be used to create a methodology for the selection of socially significant projects for the provision of state support.

scholarly journals Analytical Rheology of Honey: A State-of-the-Art Review

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1709
Author(s):  
Célia Faustino ◽  
Lídia Pinheiro
Keyword(s):  
Sugar Content ◽  
Rheological Behaviour ◽  
Principal Component ◽  
Rheological Parameters ◽  
Experimental Conditions ◽  
Thixotropic Behaviour ◽  
Ancient Times ◽  
Medicinal Properties ◽  
Complex Relationships ◽  
Temperature Time

Honey has been used as a nutraceutical product since ancient times due to its nutritional and medicinal properties. Honey rheology influences its organoleptic properties and is relevant for processing and quality control. This review summarizes the rheological behaviour of honeys of different botanical source(s) and geographical locations that has been described in the literature, focusing on the relation between rheological parameters, honey composition (moisture, water activity, sugar content, presence of colloidal matter) and experimental conditions (temperature, time, stress, shear rate). Both liquid and crystallized honeys have been addressed. Firstly, the main mathematical models used to describe honey rheological behaviour are presented highlighting moisture and temperature effects. Then, rheological data from the literature regarding distinct honey types from different countries is analysed and results are compared. Although most honeys are Newtonian fluids, interesting shear-thinning and thixotropic as well as anti-thixotropic behaviour have been described for some types of honey. Rheological parameters have also been successfully applied to identify honey adulteration and to discriminate between different honey types. Several chemometric techniques have also been employed to obtain the complex relationships between honey physicochemical and rheological properties, including partial least squares (PLS), principal component analysis (PCA) and artificial neural networks (ANN).

COMPARATIVE ASSESSMENT OF MILK PROTEIN COAGULANTS OF DIFFERENT ORIGIN

2021 ◽  
Author(s):  
А.Г. КРУЧИНИН ◽  
С.Н. ТУРОВСКАЯ ◽  
Е.Е. ИЛЛАРИОНОВА ◽  
А.В. БИГАЕВА
Keyword(s):  
Dairy Products ◽  
Milk Protein ◽  
Proteolytic Enzymes ◽  
Raw Materials ◽  
Technical Information ◽  
Animal Origin ◽  
Technological Properties ◽  
Recombinant Enzymes ◽  
Rennet Coagulation ◽  
Milk Coagulation

Потребность в увеличении количества и качества производимой молочной продукции стимулирует исследования, направленные на повышение эффективности переработки молочного сырья, что, в свою очередь, невозможно без изучения технологических свойств молока и функционально необходимых ингредиентов, применяемых в производстве различной молочной продукции. На основе научно-технической информации международных и российских баз данных, систематизированной в рамках изучаемой тематики, представлен обзор научных работ о коагулянтах белков молока различного происхождения, применяемых при кислотной, кислотно-сычужной и сычужной коагуляции. Установлено, что в российской и международной производственной практике востребованы коагулянты животного, микробного и рекомбинантного происхождения. Наибольшим спросом среди коагулянтов животного происхождения пользуется химозин, получаемый из желудков телят. Ферменты микробного и рекомбинантного происхождения отличаются более стабильным качеством и низкой стоимостью, но их производство, основанное на методах генной инженерии, вызывающих предубеждение у большинства потребителей, практически полностью сосредоточено за рубежом. При условии повышения лояльности потребителей ферменты рекомбинантного происхождения могут стать наиболее перспективными функциональными ингредиентами. Исследования потенциала различных протеолитических ферментов растительного происхождения выявили невысокий технологический эффект их применения. Рассмотренный материал позволяет прогнозировать перспективность научных исследований по выявлению механизмов коагуляции молока и новых эффективных и универсальных коагулянтов совокупно с селекционной практикой отбора животных, направленной на улучшение технологических свойств молочного сырья. The need to increase the quantity and quality of dairy products encourages research aimed at improving the efficiency of processing dairy raw materials, which, in turn, is impossible without studying the technological properties of milk and functionally necessary ingredients used in the production of various dairy products. On the basis of scientific and technical information from international and Russian data bases, systematized within the framework of the subject under study, a review of scientific works on milk protein coagulants of various origins used in acid, acid-rennet and rennet coagulation is presented. It is established that coagulants of animal, microbial and recombinant origin are in demand in the Russian and international production practice. The greatest demand among coagulants of animal origin is chymosin, obtained from the stomachs of calves. Microbial and recombinant enzymes are characterized by more stable quality and lower cost, but their production, based on genetic engineering methods that cause prejudice among most consumers, is almost entirely concentrated abroad. If consumer loyalty is increased, recombinant enzymes may become the most promising functional ingredients. Studies of the potential of various proteolytic enzymes of plant origin revealed a low technological effect of their use. The considered material allows us to predict the prospects of scientific research to identify the mechanisms of milk coagulation and new effective and universal coagulants together with the breeding practice of animal selection, aimed at improving the technological properties of dairy raw materials.

Comparative Assessment of Resistance of Hardwearing Anodes, Ternary Coated with Iridium, Ruthenium and Titanium

2017 ◽  
Vol 265 ◽  
pp. 580-586 ◽  
Author(s):  
L.N. Fesenko ◽  
I.V. Pchelnikov ◽  
R.V. Fedotov
Keyword(s):  
Black Sea ◽  
Sodium Hypochlorite ◽  
Sodium Salt ◽  
Sea Water ◽  
Comparative Assessment ◽  
The Black Sea ◽  
Current Voltage ◽  
Iridium Oxides ◽  
Corrosive Resistance ◽  
Selection Of

A selection of anode coatings has been studied to get sodium hypochlorite in low concentrationduring the electrolysis of 3% solution of sodium salt and the Black Sea water. The corrosive resistance of anodes has been determined, with different batches of ruthenium and iridium oxides, as well as their characteristics: chlorine outlet while passing throughthe current, voltage on the cell, the dynamics of concentration growth of available chlorine in solution.

scholarly journals Theoretical and Methodological Approaches to the Study of Social Structure: Western Ideas in Domestic Practice

2020 ◽  
Author(s):  
Iuliia Nikolaevna Soloveva
Keyword(s):  
Social Structure ◽  
Social Stratification ◽  
Russian Society ◽  
Accurate Analysis ◽  
Factors Influencing ◽  
Structure Changes ◽  
The Social ◽  
Domestic Practice ◽  
Methodological Approaches ◽  
Selection Of

The study of the social structure of society involves the selection of features that determine social stratification. The variety of these features contributes to the emergence of a large number of theoretical and methodological approaches. The article examines the most significant approaches for studying the social structure of Russian society based on the ideas of representatives of Western sociology: from class theories to theories of social stratification. In the process of transformation of society, not only the structure changes, but also the factors influencing it, which leads to the emergence of new approaches for the most complete and accurate analysis.

scholarly journals Decision Making Methods in Comparative Studies of Complex Economic Processes Management

2020 ◽  
pp. 652-664
Author(s):  
Kesra Nermend ◽  
Mateusz Piwowarski ◽  
Mariusz Borawski
Keyword(s):  
Decision Making ◽  
Comparative Analysis ◽  
Decision Analysis ◽  
Expert Assessment ◽  
Demographic Situation ◽  
Multi Criteria Decision Analysis ◽  
Economic Process ◽  
Methodological Approaches ◽  
Support Methods ◽  
Selection Of

In this study different methodological approaches are used and described by many features (indicators) of complex socio-economic process. Outcome of analysis has the most reliable and acceptable representation of the studied process specific to chosen case. In order to solve problems in this area (depending on the situation, case under consideration), methods from two groups are most often used: multidimensional comparative analysis and multi-criteria decision analysis. The first of these cases concern problems at the macro level (socio-economic development, demographic situation, population's living standards, etc.), in which the decisionmaker's participation is relatively small (eg the selection of diagnostic variables or expert assessment). The second of these groups include issues in which the decisionmaker's participation is significant which are subjective to the decisions taken and reflects his or her preferences. Among the decision support methods, one can also distinguish those that have both the characteristics of methods from the area of multidimensional comparative analysis and multi-criteria decision analysis. The article presents the combination of both trends exposing maximum possibilities of using selected methods used in the decision making by Polish schools. The general methodological assumptions, advantages of having approaches discussed (in relation to other known methods) as well as the applied aspects (exemplary applications) also presented.

scholarly journals THEORETICAL AND METHODOLOGICAL APPROACHES TO EVALUATION OF INVESTMENT ATTRACTIVENESS OF REGIONS OF UKRAINE

2021 ◽  
Author(s):  
Liudmyla Sokolova ◽  
Anita Lytvynova
Keyword(s):  
Mathematical Modeling ◽  
Public Administration ◽  
External Environment ◽  
Comparative Assessment ◽  
Financial Resources ◽  
Its Regions ◽  
Methodological Approaches ◽  
Statistical Indicators ◽  
Integral Indicator

Currently, when the Ukrainian economy is developing in an unstable, uncertain, aggressive, dynamic external environment, there is an urgent need to increase the level of investment attractiveness of each region of the country and, as a consequence, the need to increase attention to scientific and methodological support for assessing the integral indicator of investment attractiveness region. In connection with the decentralization of public administration in Ukraine, the role of local authorities in improving the socio-economic situation of its regions is increasing. In the context of real limited financial resources in the country, the problem of increasing the level of investment attractiveness of each region is becoming urgent as a characteristic that allows active investors to form an idea of the state of potential investment objects, as well as ensuring the reliability of obtaining the expected results. It should be noted that the choice of assessment indicators is subjective and depends on the goal of the investor. Such a format for solving this problem requires an assessment of the investment attractiveness of regions based on economic and mathematical modeling. Although there are many developments in this area, today there is no single effective method for assessing the investment attractiveness of the region. The work reveals the essence of the concept of investment attractiveness of a region, defines the methodological provisions of its assessment, the implementation of which requires the use of certain data from official regional statistics. Based on the basic local statistical indicators of the Kharkov, Kiev and Odessa regions of the country, a comparative assessment of their investment attractiveness was carried out. The methodological approaches and parameters determining the investment attractiveness of the regions of Ukraine have been analyzed. The information on the level of investment attractiveness of Kharkiv, Kiev and Odessa regions in 2019 has been systematised, the integral indicator of its evaluation has been defined. In the future, it is recommended to calculate the integral indicator of investment attractiveness for all regions of the country in dynamics.

scholarly journals Milk protein genotypes and milk coagulation properties of Estonian Native cattle

2008 ◽  
Vol 16 (3) ◽  
pp. 222 ◽  
Author(s):  
I. JÕUDU ◽  
M. HENNO ◽  
S. VÄRV
Keyword(s):  
Genetic Variation ◽  
Milk Protein ◽  
Coagulation Parameters ◽  
Milk Samples ◽  
Cattle Breeds ◽  
Rennet Coagulation ◽  
Native Cattle ◽  
Milk Coagulation

The genetic variation of ás1-, â- and ê-caseins and b-lactoglobulin was determined and their effects on the rennet coagulation properties were examined using 335 milk samples from 118 Estonian Native (EN) cows. We found 16 aggregate casein genotypes (ás1-, â-, ê-caseins), of which four . namely, BB A2A2 AA (21.2%), BB A1A2 AB (16.9%), BB A1A2 AA (14.4%), and BB A2A2 AB (10.2%) – occurred among nearly two-thirds of the analysed cows. Aggregate casein genotype had a significant overall effect on rennet coagulation parameters. Better rennet coagulation properties were found for aggregate casein genotypes CC A2A2 AB and BC A1A2 BB, among frequent genotypes for BB A1A2 AB. Of the cattle breeds raised in Estonia, milk from EN had the best coagulation properties and highest frequency of favourable ê-Cn B allele.;

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