Component Composition of the Biodeg-Radation Product of Fallen Leaves by Basidiomycetes Pleurotus Pulmonarius (Strain Pp-3.2)

Abstract

Today, plant waste, including fallen poplar leaves (litter), are a promising raw material for the production of useful prod-ucts using bioconversion, such as protein feed additives. The aim of this study was to study the component composition of the products obtained as a result of the bioconversion of leaf litter. The strain PP-3.2 Pleurotus pulmonarius (Fr.) Quel. In the process of substrate conversion, strain PP-3.2 primarily utilizes extractives and easily hydrolyzable polysaccharides, the amount of which decreases by 44 and 36%, respectively. The total content of polysaccharides is reduced by 20%, lignin substances-9.4%. The loss of substrate mass based on leaf litter was 23%. The product obtained after cultivation contains 28% protein. Analysis of the amino acid composition of the protein showed a high rate of phenylalanine with tyrosine (115), threonine (117.5), valine (110) and isoleucine (105%). Also, the biodegradation product has a high content of glutamic and aspartic acids (11.2 and 25.3% of the total amino acids, respectively). The levels of cadmium, lead and copper revealed as a result of studies do not exceed the maximum permissible concentrations established by the veterinary department. At the same time, there is a high content of iron (166.0 Êg/kg) and zinc (256.7 mg/kg) in the feed product. The digestibility of the product is 54%, the content of nucleic substances is up to 0.3%. Thus, the results obtained show the possibility of using the product of the conversion of poplar fallen leaves as a protein feed additive.