The study of the aminoacids in propolis composition

Abstract

The propolis presents a complex product, but its quality and biologic value depends on the chemical composition and looking at the ecological situation the study of the composition and the amino-acids dynamic in its composition have theoretic and practice importance. The aim of the experiments was the study of the composition and the amino-acids dynamic in the collected propolis in different areas from Republic of Moldova during the active season. There was established the aminoacids composition and their quantity in propolis at the special analysis at Centre of Metrology and Automation of Scientific Researches at the Academy of Science of Moldova. There was established a large amount of amino-acids (6,868 mg/g) in collected propolis from south area of Republic of Moldova. From all determined amino-acids the largest quantity it is the monoaminomonocarbonic group (alanine, valine, glycine, leucine, isoleucine, serine, treonine) – 41.45%. The monoaminodicarbonic group of amino-acids (asparagic acid and glutamic acid), consists – 25.53% from the total, heterociclc (histidine, proline) – 11.39%, diaminomonocarbonic (argine, lysine)- 747%, cycle-aromatic (fenilanina, tyrosine) – 5.92%, cystine – 6.90%, methionine – 1.19%. In autumn season (August - September), the average of the amino-acids quantity consists 3,426mg/g. The aminoacids quantity in autumn period has decreased to the spring period by 1.74 times. The highest amount had glutamic acid – 16.34% and asparagic acid 11,58% from the whole amount, the lowest quantity had metionine – 0,64% and triptophan – 0.67%.There was determined that the amino-acids quantity in propolis depends on the geographic area as well on the plants species from which it was collected. There happen quantitative changes during the active season in the amino-acids composition of the propolis.