Comparative Evaluation of Protein Hydrolysates in the Process of Constructing Based on Them Nutrient Medium for Brucella Cultivating

Objective of the study is to conduct comparative assessment of specific activity of pancreatic hydrolysates of protein-containing products, both phytogenous and zoogenous, as regards Brucella test strains; and consequently, to develop nutrient medium for Brucella cultivation, to study its biological parameters. Materials and methods. Gelatin, soy, soy concentrate, corn gluten, fish meal, freshly frozen Caspian sprat, and bovine blood pancreatic hydrolysates, obtained using conventional methodology, served as the test objects. Determination of biological parameters of nutrient media, containing the studied hydrolysates was carried out using the test-strains of Brucella abortus 19 BA and B. melitensis Rev I. Results and discussion. Gelatin hydrolysate has the best biological parameters as regards the Brucella strains. Studied have been biological parameters of nutrient media, containing combination of gelatin hydrolysate and other selected hydrolysates. Experimental nutrient medium for Brucella cultivation has been developed. Comparative assessment of the experimental nutrient medium and two other commercial media used for cultivating Brucella has been performed

Comparative Assessment of Prospective Protein Bases for Microbiological Media

Objective of the work is to carry out comparative assessment of the pancreatic hydrolysates of protein-containing products, both phytogenous and zoogenous, as nutrient base for microbiological media. Gelatine, soy, soy concentrate, maize gluten, fish meal, common kilka, and bovine blood have been used as a feedstock. Protein stuff hydrolysis, hydrolysate purification, and validation of physical-chemical properties were performed in accordance with conventional techniques. Testing of peptone biological parameters has been carried out on the model of nutrient agar using Shigella flexneri 1a 8516, Shigella sonnei “S form”, Pseudomonas aeruginosa 27/99, Serratia plymuthica 1 test strains. Identified have been physical-chemical parameters of the hydrolysates under study. Detected are the variations in quantity, diameter and frequency of dissociation among the colonies of Shigella flexneri 1a 8516, Shigella sonnei “S form”, chromogenesis in Pseudomonas aeruginosa 27/99, Serratia plymuthica 1, cultivated on agar media with hydrolysates under study. Obtained are the comparative data on physical-chemical and biological parameters of all experimental hydrolysates, which offers an opportunity to differentiate their choice when adding them into bacteriological nutrient media

Quality Assessment of the Live Plague Vaccine Prepared Using nutrient Medium on the Basis of Hydrolysate of Concentrated Corn steep

Objective of the study was to test the nutrient medium based on the enzymatic hydrolysate of corn extract condensed for a scaled production of live plague vaccine and to check the quality of the obtained batches against the specified parameters. Materials and methods .A dense nutrient medium based on corn extract was used to grow biomass in the process of live plague vaccine production. The quality parameters of the vaccine preparation obtained were studied by the regulated methods set forth in the regulatory documentation. Results and conclusions. The vaccine was monitored at all stages of its manufacture, including control of the finished dosage form, in strict accordance with the approved regulatory documentation. All the experimental production series complied with the specified indices. Approbation of the production cycle environment for live plague vaccine manufacturing showed efficiency of the conditions and the possibility of environment’s application in the industrial production of the preparation

Monitoring of Stability of the Live Plague Vaccine Produced Using Condensed Corn Steep Extract Hydrolysate-Based Nutrient Medium

Objective of the study was to analyze the stability of the preparation of a live plague vaccine made using an experimental nutrient medium over its shelf life. Materials and methods. A series of live plague vaccine based on Yersinia pestis EV NIIEG strain prodused using experimental nutrient medium were utilized in this work. Most significant qualitative parameters of the preparation were studied: microbe cell content, viability, thermal stability, mass loss during the process of drying, and immunogenicity. Results and discussion. The stability of the vaccine produced using the nutrient medium based on hydrolysate of condensed corn steep extract was monitored over a specified shelf life (three years). A comparative analysis of the viability of all experimental vaccine series was carried out at certain time intervals - short-term storage (up to 3 months) and before the expiration date. During storage, there was an insignificant decrease in the percentage of living microbial cells, while in no series the viability decrease reached below the regulated levels of 25 %. Such a decrease is natural for a “live preparation” and is not critical within the obtained limits. The rest of the studied indicators practically did not change. Thus, the analysis of the data obtained indicates that in all the periods of observation the drug retained the stability of the main regulated indicators. The studies confirm the feasibility of using this referred nutrient medium based on hydrolyzed corn steep extract in industrial production of the plague live vaccine preparation

Experimental Solid Medium for Legionella Cultivation

Presented is the principal scheme for preparation of experimental medium for Legionella cultivation on the basis of fermentative hydrolysate of pig lung. Shown is that the culture medium has good growth properties and meets the requirements of regulatory documentation for culture medium used for isolation and cultivation of the causative agent of legionellosis

Studying the Effect of Experimental Bases on the Growth Quality of Liquid Nutritional Media for Submerged Cultivation of Plague Microbe Vaccine Strain

The aim of the study was to investigate the effect of experimental bases on the growth qualities of liquid nutrient media at the stage of obtaining the biomass of plague microbe vaccine strain using submerged cultivation.Materials and methods. Yersinia pestis EV NIIEG vaccine strain was used in the work. The cultivation was carried out in a 5 L bioreactor with automatic stirrer control. We used 28 variants of nutrient media obtained through combining five types of bases and six growth stimulants. Nutrient media without the addition of growth-stimulating additives were used as controls. The following parameters were assessed in the yield biomass: the total number of microbial cells, pH, the percentage of viable microbial cells.Results and discussion. On experimental nutrient media, biomasses of the plague microbe vaccine strain have been produced using submerged cultivation. After evaluating bacterial suspensions by the main indicators, the quality of the obtained suspensions has been compared depending on the nutrient medium used. The most promising bases identified are pancreatic hydrolyzate of casein with dry enzymatic peptone and acid hydrolyzate of corn syrup, especially in combination with such growth stimulants as sodium sulfite, ferrous ammonium sulfate or ammonium molybdate

Usage of Solid Medium on the Basis of Corn-Steep Extract Hydrolysate in Manufacturing of Live Plague Vaccine and for Plague Agent Strain Preservation

Objective of the study was to develop a solid medium on the basis of enzyme digest of corn-steep extract for manufacturing of live plague vaccine and storage of plague agent strains. Materials and methods. Vaccine strain and virulent strains of Yersinia pestis, nutrient media for accumulation and storage. Investigated parameters were assessed according to regulatory documentation. Results and conclusions. Developed has been nutrient medium based on enzyme digest of corn-steep extract with growth stimulation additives – Mohr’s salt and sodium sulphite. Studied have been its physical-chemical and biological properties. Approbation of the medium in manufacturing laboratory has revealed its high efficiency and possibility of usage in industrial production of live plague vaccine. Batches of preparation with optical concentration of 100 mlrd/ml and (68.2±0.9) % viability have been manufactured. Application of the stated medium allows for increase in biomass output and decrease in prime cost of final product. Confirmed has been the possibility to store the virulent plague agent strains on the medium at (4±2) °C for 18 months without reduction of the culture viability

Development of Nutrient Media out of Vegetable Material for Culturing Particularly Dangerous Infections Agents

5 experimental nutritious bases were prepared out of plant materials (soybeans, soymilk, sugar-beet molasses - sugar syrup), and their physical and chemical parameters and amino-acid composition were studied. Nutrient media developed on experimental basis met the nutritious demands of studied strains of plague, cholera, anthrax microbes and sporogenous saprophytes

Nutrient Media for Diagnosis of Brucellosis

The overview contains information from Russian and foreign literature about composition and usage of nutrient media for brucellosis diagnosis and immunobiological preparations production. Nutrient media for cultivation, isolation, enrichment, identification and differentiation of Brucella and their L-form as well as transport media and synthetic media are considered. Advantages and disadvantages are described for some of the products. The overview also contains information about nutritional bases, growth factors and selective components included in these media. There is a particular focus on selective media, their history and improvement. The article gives the requirements for the inhibitory properties of these products and the disadvantages of using certain antimicrobial agents. The authors list nutrient media for various purposes, certified for use by the Russian regulatory documents, recommendations of World Health Organization and World Organization for Animal Health. Data about principles for assessing the quality of culture media and test strains used to control biological parameters of culture media are covered. The authors also present materials about the trends in nutrient media development for Brucella cultivation and isolation, methods of their application. In conclusion, they identify the need to conduct research in the sphere of the development of new nutrient media for Brucella isolation from the material contaminated by foreign microorganisms