REGULARITIES OF PROTEOLYSIS OF PACKED LIVESTOCK RED BLOOD CELLS
Журнал: SCIENCE EVOLUTION
Том 1 № 1
, 2016
Рубрики: BIOLOGICAL SCIENCES
Авторы:
1.
Kemerovo Institute of Food Science and Technology (University)
Россия
Россия
Тип:
Статья
Страницы:
с 85
по 91
Статус:
Опубликован
Получено:
27.06.2016
Одобрено:
27.06.2016
Опубликовано:
27.06.2016
Классификаторы:
ГРНТИ 29.01 Общие вопросы физики
ГРНТИ 27.01 Общие вопросы математики
ГРНТИ 31.01 Общие вопросы химии
ГРНТИ 34.01 Общие вопросы биологии
ГРНТИ 27.01 Общие вопросы математики
ГРНТИ 31.01 Общие вопросы химии
ГРНТИ 34.01 Общие вопросы биологии
Язык материала:
английский
Ключевые слова:
proteolysis, packed red blood cells, heme iron
Аннотация (русский):
Actual methods for anti-anemic preparation producing are characterized by a number of weak points: significant hemoglobin losses during hemolysis; difficulties in achieving a high hemoglobin purity level; expensive and complex instrumentation etc. A promising direction of this research is a study of a possibility to get iron-containing mass from meat-producing animals’ blood through hydrolysis with acetic and citric acids. The author studies a correlation dependence of acid concentration on amine nitrogen mass fraction, heme iron, hydrolysis level. For packed pork blood cells, the highest amine nitrogen values are typical under the use of acetic and citric acids with mass fraction of 10%, which corresponds to 357 mg/100 cm3 under the duration of 10 hours for citric acid and 305 mg/100 cm3 under the duration of 8 hours for acetic acid. Under packed cattle blood cells hydrolysis, the highest amine nitrogen values are typical under the use of 10% citric acid solution and 10% acetic acid solution, which corresponds to 268 mg/100 cm3 i 229 mg/100 cm3 respectively. Iron yield has positive increasing dynamics. 11-12 hour hydrolysis is relatively stable, the changes in iron content are insignificant, which means that hydrolysis time increase makes no sense. Favourable conditions for hydrolysis are: mass fraction of citric acid - 10%, mass fraction of citric acid - 5%, mass fraction of acetic acid - 10%, temperature - 50 ± 1°C, process time - 12 hours.
Actual methods for anti-anemic preparation producing are characterized by a number of weak points: significant hemoglobin losses during hemolysis; difficulties in achieving a high hemoglobin purity level; expensive and complex instrumentation etc. A promising direction of this research is a study of a possibility to get iron-containing mass from meat-producing animals’ blood through hydrolysis with acetic and citric acids. The author studies a correlation dependence of acid concentration on amine nitrogen mass fraction, heme iron, hydrolysis level. For packed pork blood cells, the highest amine nitrogen values are typical under the use of acetic and citric acids with mass fraction of 10%, which corresponds to 357 mg/100 cm3 under the duration of 10 hours for citric acid and 305 mg/100 cm3 under the duration of 8 hours for acetic acid. Under packed cattle blood cells hydrolysis, the highest amine nitrogen values are typical under the use of 10% citric acid solution and 10% acetic acid solution, which corresponds to 268 mg/100 cm3 i 229 mg/100 cm3 respectively. Iron yield has positive increasing dynamics. 11-12 hour hydrolysis is relatively stable, the changes in iron content are insignificant, which means that hydrolysis time increase makes no sense. Favourable conditions for hydrolysis are: mass fraction of citric acid - 10%, mass fraction of citric acid - 5%, mass fraction of acetic acid - 10%, temperature - 50 ± 1°C, process time - 12 hours.
Ключевые слова:
proteolysis, packed red blood cells, heme iron
proteolysis, packed red blood cells, heme iron
INTRODUCTION The tendencies in the field of industrial food production are connected with the creation of functional food assortment contributing to maintaining and correcting health upon condition of day-to-day consumption due to regulatory and normalizing effect on particular organs and their functions or a whole body itself [1, 2]. Secondary derivative products of agricultural raw materials have a special place here. They are a source of biopolymers and their essential structural units - indispensable amino acids, polyunsaturated fatty acids, organic iron, and other macro- and micronutrients. They play an important role in enriching the foodstuff, both traditional assortment and new products including simulated mass-market food products, that can have a regenerating and stabilizing effect on an internal environment of a human body [2, 3]. There is a way that is related to the technology of obtaining biologically active compounds from raw animal material, more specifically, to the industrial processes of recovering iron protein hemoglobin from farm animals’ blood [4]. Hemoglobin of different purity levels can be used as a concentrated source of biologically available iron in the process of food production, oral nutritional supplement (ONS), fodder, veterinary and medicinal drugs in order to prevent and to treat iron-deficiency conditions of humans and animals [5]. However, actual methods for anti-anemic preparation producing are characterized by a number of weak points: significant hemoglobin losses during hemolysis; difficulties in achieving high hemoglobin purity level and, consequently, high iron availability; expensive and complex instrumentation; multiple-stage character. All these drawbacks lead to a high cost of hemoglobin and, subsequently, final functional anti-anemic products. A promising direction of this research is a study of a possibility to get iron-containing mass from meat-producing animals’ blood through hydrolysis [6-8]. The main advantage of employing red blood cells hydrolysis for iron-containing mass before employing hemolysis is a high level of heme iron digestibility as compared to hemoglobin-based preparations. Besides, iron-containing preparations produced through hydrolysis of farm animals’ erythrocyte proteins comprise highly digestible amino acids [9, 10]. Effective way of blood hydrolysis for producing iron-containing supplement is acidic hydrolysis. However, under these conditions there are amine nitrogen potential losses may be from 32 to 42% on different stages of technical process (hydrolysis, neutralization, breaking, purification). Therefore, it is necessary to pick hydrolysis conditions providing high level of farm animals’ packed red cells hydrolysis and conducing free heme iron and amine nitrogen yield. OBJECTS AND METHODS OF STUDY Edible acids (acetic and citric) were used as hydrolyzing acids for hydrolysis of pork and cattle packed red cells. For hydrolysis, we used packed red cells produced during stabilized blood separation under the following parameters: process time was 360 seconds for pork blood and 330 second for cattle blood. 2000 units was taken as an optimum separation factor for both kinds of raw materials. Conventional, standard and innovative methods were used to perform the present research. Theoretical and experimental studies were performed in the light of modern methodology of complex phenomenon research through conventional and innovative methods of biochemical, physical-chemical, structural-mechanical analysis using the latest advances in science and technology. Amine nitrogen was determined through formol titration, and total nitrogen - through Kjeldahl method. The degree of hydrolysis was determined as a ratio of amine nitrogen to total nitrogen. Heme iron content was determined in accordance with all-Union State Standard GOST-26928-86. Nutrition products. Method for iron determination. RESULTS AND DISCUSSION Final hydrolysis product represents a mixture of free heme iron and peptides with different molecular weight. There are no neutralization and filtration stages. It helps to prevent amine nitrogen and heme iron losses. For hydrolysis we used 1%-, 5%- and 10%-solutions of acetic and citric acids at a temperature of 50 ± 1°С. Acid solution was put in quantity of 10% to a packed red cells volume. The dependence of amine nitrogen mass fraction on hydrolysis process time, kind and concentration of the acid is presented in Fig. 1-4. Fig. 1. The dynamics of amine nitrogen yield under packed pork blood cells hydrolysis with сіtric acid: 1 - 1%-solution; 2 - 5%- solution; 3 - 10%- solution. Fig. 2. The dynamics of amine nitrogen yield under packed pork blood cells hydrolysis with acetic acid: 1 - 1%-solution; 2 - 5%- solution; 3 - 10%- solution. Fig. 3. The dynamics of amine nitrogen yield under packed cattle blood cells hydrolysis with сіtric acid: 1 - 1%-solution; 2 - 5%- solution; 3 - 10%- solution. Fig. 4. The dynamics of amine nitrogen yield under packed cattle blood cells hydrolysis with acetic acid: 1 - 1%-solution; 2 - 5%- solution; 3 - 10%- solution. Having analyzed pictures 1-4 data, we have come to the following conclusions. The dependences of amine nitrogen mass fraction on hydrolysis process time, kind and concentration of used acid have general nature for packed red cells of blood of two animals. The content of amine nitrogen in the process of packed red cells hydrolysis is marked by two specific zones: a zone of constant amine nitrogen growth during 8-10 hours under hydrolysis with citric acid and 5-6 hours under hydrolysis with acetic acid. The second zone is a zone of a relatively stable amine nitrogen content during 2 hours under hydrolysis with citric acid and 5-6 under hydrolysis with acetic acid. However, there are differences in quantitative content of amine nitrogen depending on a kind of an animal. For packed pork blood cells, the highest amine nitrogen values are typical under the use of acetic and citric acids with mass fraction of 10%, which corresponds to 357 mg/100 cm3 under the duration of 10 hours for citric acid and 305 mg/100 cm3 under the duration of 8 hours for acetic acid. There is also high yield of amine nitrogen under packed pork blood cells hydrolysis with 5% citric acid solution. Amine nitrogen mass fraction after 10 hours hydrolysis is 290 mg/100 cm3. Then amine nitrogen growth rates edge down, the changes of amine nitrogen are insignificant, which means that hydrolysis is nearly over. That is why hydrolysis lasting more than 12 hours is pointless. Results are considered ineffective under hydrolysis with 1% citric acid solution and 5% acetic acid solution. Under packed cattle blood cells hydrolysis, there is a great jump corresponding to process duration of 5 hours, then amine nitrogen mass fraction increases insignificantly. The highest amine nitrogen values are typical under the use of 10% citric acid solution and 10% acetic acid solution, which corresponds to 230 mg/100 cm3 и 200 mg/100 cm3 respectively. At the end of hydrolysis amine nitrogen mass fraction is 268 mg/100 cm3 for citric acid (the growth of amine nitrogen is 14.1%) and 229 mg/100 cm3 for acetic acid (the growth of amine nitrogen is 12.6%). As can be seen from the above, packed cattle blood cells hydrolysis makes sense with citric and acetic acid with mass fraction of 10%. The process time should not go beyond 12 hours. Besides, we have measured free heme iron quantity in the process of hydrolysis of packed pork and cattle blood cells with different variants of citric and acetic acid (Table 1-2). Table 1. Heme iron mass fraction under packed pork blood cells hydrolysis Process time, h Free heme iron content, % to hydrolysate mass citric acid mass fraction of 1% citric acid mass fraction of 5% citric acid mass fraction of 10% acetic acid mass fraction of 1% acetic acid mass fraction of 5% acetic acid mass fraction of 10% 1 0.05 ± 0.02 0.07 ± 0.02 0.10 ± 0.07 0.04 ± 0.02 0.05 ± 0.02 0.07 ± 0.02 3 0.09 ± 0.02 0.11 ± 0.07 0.14 ± 0.07 0.08 ± 0.07 0.09 ± 0.07 0.11 ± 0.07 5 0.15 ± 0.07 0.17 ± 0.07 0.20 ± 0.11 0.14 ± 0.07 0.15 ± 0.07 0.17 ± 0.07 7 0.22 ± 0.11 0.26 ± 0.11 0.29 ± 0.11 0.20 ± 0.11 0.22 ± 0.11 0.24 ± 0.11 9 0.26 ± 0.11 0.30 ± 0.15 0.33 ± 0.15 0.24 ± 0.11 0.24 ± 0.11 0.26 ± 0.11 11 0.29 ± 0.11 0.33 ± 0.15 0.36 ± 0.15 0.27 ± 0.15 0.28 ± 0.11 0.30 ± 0.15 12 0.29 ± 0.11 0.33 ± 0.15 0.35 ± 0.15 0.27 ± 0.15 0.28 ± 0.11 0.30 ± 0.15 Table 2. Heme iron mass fraction under packed cattle blood cells hydrolysis Process time, h Free heme iron content, % to hydrolysate mass citric acid mass fraction of 1% citric acid mass fraction of 5% citric acid mass fraction of 10% acetic acid mass fraction of 1% acetic acid mass fraction of 5% acetic acid mass fraction of 10% 1 0.03 ± 0.01 0.05 ± 0.02 0.08 ± 0.02 0.02 ± 0.02 0.03 ± 0.02 0.05 ± 0.02 3 0.07 ± 0.01 0.09 ± 0.02 0.12 ± 0.07 0.06 ± 0.02 0.07 ± 0.02 0.09 ± 0.02 5 0.11 ± 0.01 0.13 ± 0.07 0.16 ± 0.07 0.10 ± 0.07 0.11 ± 0.07 0.13 ± 0.07 7 0.15 ± 0.01 0.19 ± 0.07 0.22 ± 0.07 0.13 ± 0.07 0.15 ± 0.07 0.17 ± 0.07 9 0.19 ± 0.01 0.23 ± 0.11 0.26 ± 0.07 0.17 ± 0.07 0.17 ± 0.07 0.19 ± 0.07 11 0.24 ± 0.01 0.28 ± 0.11 0.30 ± 0.15 0.22 ± 0.11 0.23 ± 0.11 0.25 ± 0.11 12 0.25 ± 0.01 0.29 ± 0.11 0.31 ± 0.15 0.23 ± 0.11 0.24 ± 0.11 0.26 ± 0.11 Iron quantity increases during 12 hours under all kinds of hydrolysis. However, it is necessary to say that the changes in iron content are insignificant up to the end of the process, which means that hydrolysis time increase by more than 12 hours makes no sense. Under packed pork blood cells hydrolysis, the maximum iron quantity is observable upon use of 5% citric acid solution, iron content is 0.33 ± 0.15 %, 10% citric acid solution, iron content is 0.35 ± 0.15 %, and 10% acetic acid solution, iron content is 0.30 ± 0.15 %. Under packed cattle blood cells hydrolysis, the maximum iron quantity is observable upon use of citric and acetic acid with mass fraction of 10% and citric acid with mass fraction of 5%. Iron content is 0.31 ± 0.15 %; 0,26 ± 0.11 %; 0.29 ± 0.11 % respectively. To make an optimum temperature choice, we have performed an experiment using the best options of acids: 10% citric acid solution, 5% citric acid solution and 10% acetic acid solution. The chosen temperature conditions are 45 ± 1°С, 50 ± 1°С и 55 ± 1°С. The efficiency of the process have been controlled in accordance with the level of packed red cell hydrolysis. The dependences of packed red cell hydrolysis levels on hydrolysis process time are presented in Fig. 5 and 6. Under packed pork blood cell hydrolysis, the highest hydrolysis level is 29.0% at the temperature of 45 ± 1°С (Fig. 5, a) after 10 hours of hydrolysis with citric acid with mass fraction of 10%. For acetic acid with mass fraction of 10% and citric acid with mass fraction of 5%, the level of hydrolysis is 26.5 % after the same period of time. During the following 2 hours the level of hydrolysis does not change for all options. Under packed pork blood cell hydrolysis, the regularities of the whole process at the temperature of 50 ± 1°(Fig. 5, b) is the same as at the temperature of 45 ± 1°С. Tentatively, we can mark 2 periods. The first one is the period of the constant hydrolysis level increase. The second period is a stable period of hydrolysis level. Under hydrolysis with citric acid with mass fraction of 5%, hydrolysis level increase is observable during 10 hours, the second period is the following 2 hours. The highest hydrolysis level value is 29.8%. Under hydrolysis with acetic acid with mass fraction of 10%, the first period lasts 10 hours, the second one - the following 2 hours. Hydrolysis level is 27.0%. Under hydrolysis with citric acid with mass fraction of 10%, the period of hydrolysis level increase lasts 9 hours, the second period - 3 hours. The highest hydrolysis level is 31.8 %. Under packed pork blood cell hydrolysis at the temperature of 55 ± 1°С (Fig. 5, c) the differences from hydrolysis at a temperature of 50 ± 1°С are insignificant in values. Hydrolysis with citric acid with mass fraction of 5% is performed up to the moment when hydrolysis level is 30.2%. The period of hydrolysis level increase is 10 hours. Under hydrolysis with acetic acid with mass fraction of 10%, hydrolysis level increases up to 27.9% during 10 hours. During the last 2 hours the level does not change. Hydrolysis with citric acid with mass fraction of 10% leads to the hydrolysis level of 32.3% during 9 hours. The second period lasts the following 3 hours and does not lead to hydrolysis level increase. (a) (b) (c) Fig. 5. The influence of process time on packed pork blood cell hydrolysis depending on the temperature: (а) 45 ± 1°С; (b) 50 ± 1°С; (c) 55 ± 1°С; 1 - 5% citric acid solution; 2 - 10% acetic acid solution; 3 - 10% citric acid solution. Under packed cattle blood cell hydrolysis at the temperature of 45 ± 1°С (Fig. 6, a), the highest hydrolysis level is achieved due to the use of citric acid with mass fraction of 10% and goes to the level of 30.3%. For acetic acid with mass fraction of 10% and citric acid with mass fraction of 5%, this value is 28.0%. These values are achieved after 10 hours of hydrolysis and are characterized by fixed values during the following 2 hours. Under packed cattle blood cell hydrolysis at the temperature of 50 ± 1°С (Fig. 6, b), the dependences of hydrolysis level have the same nature as hydrolysis at the temperature of 45 ± 1°С. Under hydrolysis with citric acid with mass fraction of 5%, the highest hydrolysis level is 29.8 %. This value is achieved after 11 hours. Under hydrolysis with citric acid with mass fraction of 10%, the period of hydrolysis level increase lasts 9 hours. The second period lasts 3 hours. The highest hydrolysis level value is 30.5%. Packed cattle blood cell hydrolysis at the temperature of 55 ± 1°С (Fig. 6, c) proceeds similar to packed pork blood cell hydrolysis at the same temperature. Under hydrolysis with citric acid with mass fraction of 5%, the period of constant hydrolysis level increase is 9 hours; the second period lasts the following 3 hours. The highest hydrolysis level value is 30.2%. The use of acetic acid with mass fraction of 10% helps to achieve hydrolysis level value of 27.5%. (a) (b) (c) Fig. 6. The influence of process time on packed cattle blood cell hydrolysis depending on the temperature: (а) 45 ± 1°С; (b) 50 ± 1°С; (c) 55 ± 1°С; 1 - 5% citric acid solution; 2 - 10% acetic acid solution; 3 - 10% citric acid solution. Hydrolysis with citric acid with mass fraction of 10% is characterized by 2 periods. The first one lasts 9 hours, the second one - 3. The highest hydrolysis level value is 31.0%. All experimental data received show that hydrolysis level depends on the temperature of the process. Still, the difference of the levels is no more than 2% at the temperatures of 50 ± 1°С and 55 ± 1°С. Consequently, the temperature of 50 ± 1°С is optimal for packed pork and cattle blood cell hydrolysis. Here are some conclusions of the research on the influence of hydrolysis parameters on amine nitrogen yield, free heme iron content and hydrolysis level. The following acids are suitable for packed pork and cattle blood cell hydrolysis: citric acid with mass fraction of 5%, citric acid with mass fraction of 10%, acetic acid with mass fraction of 10%. Each of the variants has a positive effect of hydrolysis. After hydrolysis is over, the resulted substance in all three cases is thick and has slightly sour flavour. For citric acid with mass fraction of 5%, the liquid is brown with red shade; for citric acid with mass fraction of 10% - chocolate brown. For acetic acid with mass fraction of 10%, hydrolysate has dark chocolate brown colour. CONCLUSION As can be seen from the above, the present research concerns the parameters of packed pork and cattle blood cell acid hydrolysis with the use of citric and acetic acids. The study of dynamics of amine nitrogene and free heme iron storage, hydrolysis level and molecular-mass peptide distribution in hydrolysates reveals that hydrolysis is rational to perform with 10 citric acid solution during 12 hours at the temperature of 50 ± 1°С.
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