Abstract
The growing demand for meat and dairy products necessitates the intensification of the production of feeds containing high-protein components. Yarrowia lipolytica biomass constitutes a rich source of easily digestible proteins and numerous vitamins, which makes it a valuable additive for both liquid and dry feeds. Unfortunately, the liquid products are susceptible to the growth of undesirable microflora. The aim of the presented research was to assess the possibility of using selected chemical substances to stabilize the high-protein liquid products acquired from Yarrowia lipolytica biomass. The research was designed with the use of a statistical method based on mixture designs. Microbiological stability was assessed using the results of culture tests aimed at calculating the total number of mesophilic bacteria, yeasts, molds, and bacteria from the coli and Salmonella sp. groups. Storage tests were performed at temperatures of 4 and 25 °C. Sodium benzoate, potassium sorbate and phosphoric acid were used as preservatives. The use of preservatives resulted in a significant decrease in the numbers of bacteria during storage. After 30 days of storage, the total number of bacterial cells was 0.95±0.11 and 1.5±0.09 Log10 Cfu ml-1, respectively, for storage tests at temperatures of 4 and 25°C. A product with optimum preservative mixture composition, stored at 4°C, should contain 1297mg l-1 of sodium benzoate and 1203 mg l-1 of phosphoric acid. In the case of products stored at 25°C, the concentration of sodium benzoate and phosphoric acid should be 1307 mg l-1 and 1197 mg l-1, respectively.
Highlights
Livestock production has recently seen dynamic growth, which is highly correlated with the increasing wealth of societies in developing countries
The production technology of the diet supplement based on the yeast Yarrowia lipolytica consists of several stages (Fig.1)
The first point was the hydrodynamic cavitation system, the purpose of which is the disintegration of yeast cells
Summary
Livestock production has recently seen dynamic growth, which is highly correlated with the increasing wealth of societies in developing countries. In 2009, a Polish company, Skotan SA, in cooperation with scientists from the Wrocław University of Environmental and Life Sciences, designed a worldwide unique technology for the industrial production of Yarrowia lipolytica feed yeast biomass (Rymowicz, 2009). This strain is capable of intensive growth on vegetable fats, degumming, and glycerin fraction created during biodiesel production. Yarrowia lipolytica biomass constitutes a rich source of digestible proteins (41 - 45%) and numerous vitamins, which makes it a valuable feed additive (Baszczok and Rymowicz, 2011). The powdered form of the product, acquired through spray drying, was registered under catalog number 00
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
