Ultrasound-assisted extraction (US-AE) of total extractive substances from the herb Lady`s Bedstraw (Galium verum L.) is useful extraction method for its application in food manufacturing. The effect of different temperatures (T) and solventto-solid ratios (S) on the US-AE extraction yield was studied in this paper. The influence and optimum of the operating parameters (T and S) was investigated using response surface methodology (RSM). The T and S had impact on extraction yield. RSM showed that the optimal extraction parameters, which gave a maximum extraction yield of 18.7%, were T of 40 o C and S of 30 kg kg-1. Using modeled optimized conditions, detected relative difference between predicted and experimental yield was 3.3 %. RSM successfully predicted optimal parameters and proved as useful tool for standardization of extraction conditions for bioactive components from plants important for food industry.

The aim of the paper is to point out the impact of the insurance contract on the safety of agricultural producers in the Republic of Srpska, based on the assumption that the insurance of crops, fruits and animals is a factor that implies elimination of harmful consequences in case of damage. This attitude of the authors is based on the fact that with the conclusion of an insurance contract in agriculture, the part of the responsibility is transferred to the state (by participation in the co-financing of the insurance premium), then to the insurance company (by claiming the damage from the insurance) and finally to the agricultural producers. Bearing in mind that insurance is very present in all segments of the modern society, which implies a great variety of forms of insurance, the authors of this paper start by presenting a general structure and classification of insurance, which also includes the insurance for agricultural purposes. In order to get a realistic picture of the current state of insurance in agriculture in the Republic of Srpska, an analysis of the legal regulation that regulates the mentioned issues was carried out. The authors also conducted a survey among agricultural producers to analyze the reasons why they have a negative interest for this segment of insurance and thus a small number of closed insurance policies with insurance companies. Based on these findings, this paper gives recommendations for the improvement of the situation and proposals for better solutions which would raise the safety of agricultural producers to a higher level.

The aim of this paper is to present the application of quantitative methods in the analysis of foreign trade indicators of corn in Bosnia and Herzegovina. Subsequently, based on the analysis, the forecast of import and export parameters was created for the 2018-20 period which predicted that corn imports and exports would increase both in the natural and value form. Furthermore, it was established for the observed period that Serbia was the largest importer of this crop to Bosnia and Herzegovina, and that Turkey was a country to which the corn from Bosnia and Herzegovina was mostly exported. The research in this paper can serve the purpose of further planning and development of both the production and the markets of this crop and agriculture as a whole.

The objective of this paper was to assess the antiradical effectiveness of propolis extract (PE) based on 2.2-diphenyl-1-picrylhydrazyl radical (DPPH•) bleaching assay kinetic profile. The kinetic profile of scavenging DPPH• for PE exhibited one kinetic period characterized by one kinetic constant. The second-order rate constant (k2) for the oxidation of PE by DPPH•, determined for the first time in this study, was 0.17 dm3g−1s−1. The obtained k2 value was compared to that of synthetic antioxidants and natural extracts used in the food industry. Kinetic analysis of PE antiradical effectiveness showed that the k2 was within the range values for natural colorants of fruit extracts and should be considered as a fast acting natural antioxidant source. The k2 parameter indicates the extent of oxidation inhibition that is based on all of the kinetic profiles of DPPH bleaching rather than single point measurements. For this reason, the kinetic analysis should become a necessary step for more precise antioxidative characterization of propolis.

Ни ко ла Б. Кр стић, сту дент док тор ских сту ди ја Уни вер зи тет у Но вом Са ду Прав ни фа кул тет у Но вом Са ду advni ko la kr