Browsing by Author "Zdravković, Jasmina"

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CHEMICAL COMPOSITION OF LEMON GRASS EXTRACTS
(Faculty of Agronomy in Čačak, University of Kragujevac,, 2023-03-17) Mladenovic, Jelena; Jovanović, Djordje; Pavlović, Nenad; Đurić, Milena; Zdravković, Jasmina
The plant lemon grass (Aloisia citrodora) was used as material in this work. The percentage of dry matter, organic acids and cellulose, was determined from the fresh plant material. Extracts are obtained from chopped dry lemongrass leaves. Extraction was done by maceration, Soxhlet and ultrasound. The content of extracted matter in the obtained extracts was determined, as was the content of vitamin C.
Effect of processing on vitamin C content, total phenols and antioxidative activity of organically grown red beetroot ('Beta vulgaris' ssp. 'Rubra')
(Centre for Evaluation in Education and Science (CEON/CEES), 2021) Pavlović, Nenad; Mladenović, Jelena; Stevović, Vladeta; Bošković-Rakočević, Ljiljana; Moravcevic, Djordje; Poštić, Dobrivoj; Zdravković, Jasmina
The demand for organic food is rising since consumers want food from reliable, highest quality sources originating from the environment, undisturbed by cultivation and processing. It is necessary to determine to what extent there is a scientific basis for the claims that organic food is of high quality. In this study, beetroot from an organic production system originating from 6 certified organic food producers from different geographic locations was examined. The organic beetroot samples were processed by pasteurization at 70 ºC and 90 ºC into beet juice or by drying at 55 ºC. The following samples were tested and compared: fresh beetroot, pasteurized beet juice and dried beetroot slices. The concentration of vitamin C, level of total phenol compounds (TPC) and antioxidative activity (TAA) in beetroot were influenced by the geographic origin and the applied processing method. The highest degradation for all analysed parameters was found in the samples treated by drying or pasteurisation at 90 ºC. The lowest losses of studied phytochemical components were observed during juice pasteurisation at 70 ºC. The correlation coefficient between TPC and TAA was high and significant (r2 = 0.966).
Effect of processing on vitamin C content, total phenols and antioxidative activity of organically grown red beetroot ('Beta vulgaris' ssp. 'Rubra')
(Centre for Evaluation in Education and Science (CEON/CEES), 2021) Pavlović, Nenad; Mladenović, Jelena; Stevović, Vladeta; Bošković-Rakočević, Ljiljana; Moravčević, Đorđe; Poštić, Dobrivoj; Zdravković, Jasmina
The demand for organic food is rising since consumers want food from reliable, highest quality sources originating from the environment, undisturbed by cultivation and processing. It is necessary to determine to what extent there is a scientific basis for the claims that organic food is of high quality. In this study, beetroot from an organic production system originating from 6 certified organic food producers from different geographic locations was examined. The organic beetroot samples were processed by pasteurization at 70 ºC and 90 ºC into beet juice or by drying at 55 ºC. The following samples were tested and compared: fresh beetroot, pasteurized beet juice and dried beetroot slices. The concentration of vitamin C, level of total phenol compounds (TPC) and antioxidative activity (TAA) in beetroot were influenced by the geographic origin and the applied processing method. The highest degradation for all analysed parameters was found in the samples treated by drying or pasteurisation at 90 ºC. The lowest losses of studied phytochemical components were observed during juice pasteurisation at 70 ºC. The correlation coefficient between TPC and TAA was high and significant (r2 = 0.966).
GENETIČKI ODGOVOR LUCERKE NA TOKSIČNO DELOVANJE JONA ALUMINIJUMA NA KISELOJ HIDROPONSKOJ KULTURI
(Društvo genetičara Srbije, Beograd, 2023-10-16) Stepić, Marija; Bekčić, Filip; Prijović, Mladen; Radović, Jasmina; Zdravković, Jasmina
Toksičan efekat aluminijuma veoma je važan faktor koji ograničava rast i razviće korena lucerke (Medicago sativa L.) na kiselim zemljištima što dovodi do smanjenja prinosa. Cilj eksperimenta bio je da se utvrdi uticaj aluminijuma na: dužinu korena, svežu nadzemnu masu, svežu masu korena, broj bočnih korenova, dužinu bočnih korenova i na rastojanje do prvog bočnog grananja na korenu kod klijanaca tri sorte lucerke (Zuzana, K-28, O-66) u hidroponskoj kulturi u kontrolisanim uslovima. Korišćen je Hoaglandov rastvor ½ jačine pH vrednosti 4.5, za tretman je korišćen aluminijum u formi aluminijum-hlorida (koncentracije 100 µM) i za analize je korišćeno 40 klijanaca po sorti.
GENOTIPSKI ODGOVOR NA UTICAJ RAZLIČITIH FORMULACIJA AZOTNIH ĐUBRIVA KOD ZELENE SALATE (LACTUCA SATIVA L.)
(Društvo genetičara Srbije, Beograd, 2023-10-16) Marjanović, Miloš; Pavlović, Nenad; Mladenovic, Jelena; Joksimović, B.; Tomić, Dalibor; Stevović, Vladeta; Madic, Milomirka; Zdravković, Jasmina
Primenom azotnih mineralnih đubriva povećava se usvajanje nitrata, a time i njihov sadržaj u biljkama. Pri utvrđivanju doze azota neophodno je dovesti u sklad prinos i sadržaj nitrata u zelenoj salati (Lactuca sativa). Cilj ovog eksperimenta bio je da se utvrdi uticaj različitih formulacija azotnih mineralnih đubriva (nitratni–KAN, amidni–urea, amonijačni–amonijum sulfat i kontroli tretman bez đubrenja) na antioksidativni profil, sadržaj vitamina C, ukupan sadržaj nitrata, visinu glavice i masu kod pet genotipova zelene salate G-12, Z-6, MK, A-2, N-8. Eksperiment je sproveden u plasteniku u Trbušanima u toku 2023. godine, po slučajnom blok sistemu u 4 ponavljanja.
Heredity mode of duration of vegetative stage in onion (Allium cepa L.)
(University of Banja Luka Faculty of Agriculture, 2022-05-26) Pavlović, Nenad; Marjanović, Miloš; Mladenovic, Jelena; Tomić, Dalibor; Bošković-Rakočević, Ljiljana; Moravcevic, Djordje; Zdravković, Jasmina
The duration of the vegetation period is a very important biological property of onion. In order to determine the ways of inheriting the duration of the vegetation period, the method of full diallel without reciprocals was applied, in order to obtain offspring of F1 and F2 generation. The field experiment with parents and hybrids of F1 and F2 generation was set up according to a random block system with five repetitions at the Institute for Vegetable Crops, Smederevska Palanka. The mode of inheritance of early maturity in this experiment was superdominance, observing all crossing combinations. The best general combiner in both generations was the AC 101 line. The highest significant value for SCA in both the F1 and F2 generations had the hybrid created by crossing Piroška x AC 101.
The change of phytochemical profile in beet juice and the influence of different storage conditions during one year
(University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, 2022-09-23) Pavlović, Nenad; Zdravković, Milan; Mladenović, Jelena; Tomić, Dalibor; Marjanović, Miloš; Moravcevic, Djordje; Zdravković, Jasmina
Many scientific researches proved the antioxidative impact of beet and its products. The use of vegetable juices is getting more popular in human diet. The way of storage plays an important role in preservation, long life and minimal variability of phytonutrients. The storage of products, usually in inappropriate conditions, leads to additional loss of phytonutrients, which have already been decreased by processing. In this research, we studied the impact of three ways of storage of pasteurised beet juice during one year, on content of some nutrients (total sugars, vitamin C, phenols and total antioxidative capacity). Pasteurised juice was stored in three ways: in light, at room temperature, in dark, at room temperature and in dark, at temperature of 4 °C. The change of content and differences have been followed during one month and confirmed with ANOVA and Tukey's test. The lowest changes of total sugars have been recorded in storage in dark at 4 °C, while in storage in light, the sugar content increased. The losses of vitamin C during one year of storage had linear trend of decrease. Antioxidative capacity of beet juice depends on concentration of phenol compounds and loss of these parameters was similar during period of one year. The best way of storage was dark place at low temperature.
The change of phytochemical profile in beet juice and the influence of different storage conditions during one year
(University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, 2022-09-23) PAVLOVIĆ; ZDRAVKOVIĆ; MLADENOVIĆ; TOMIĆ; MARJANOVIĆ; MORAVČEVIĆ; Zdravković, Jasmina
Many scientific researches proved the antioxidative impact of beet and its products. The use of vegetable juices is getting more popular in human diet. The way of storage plays an important role in preservation, long life and minimal variability of phytonutrients. The storage of products, usually in inappropriate conditions, leads to additional loss of phytonutrients, which have already been decreased by processing. In this research, we studied the impact of three ways of storage of pasteurised beet juice during one year, on content of some nutrients (total sugars, vitamin C, phenols and total antioxidative capacity). Pasteurised juice was stored in three ways: in light, at room temperature, in dark, at room temperature and in dark, at temperature of 4 °C. The change of content and differences have been followed during one month and confirmed with ANOVA and Tukey's test. The lowest changes of total sugars have been recorded in storage in dark at 4 °C, while in storage in light, the sugar content increased. The losses of vitamin C during one year of storage had linear trend of decrease. Antioxidative capacity of beet juice depends on concentration of phenol compounds and loss of these parameters was similar during period of one year. The best way of storage was dark place at low temperature.
Yield and quality of lettuce (Lactuca sativa L.) depending on variety and type of nitrogen fertilizer
(Faculty of Food and Agriculture, United Arab Emirates University, 2023-06-01) Bošković-Rakočević, Ljiljana; Pavlović, Nenad; Mladenovic, Jelena; Marjanović, Miloš; Zdravković, Jasmina; Tošić
The aim of this research was to determine the effect of the application of different types of nitrogen fertilizer in five different varieties of lettuce on yield. The experiment was performed in the open field, in the spring cycle of growing during 2018 and 2019. The size of the base plot was 3 m2, and the trial was set up in a random block system. The trial covered the application of various forms of nitrogen fertilizers: ammonium sulphate, ammonium nitrate and urea. The applied nitrogen dose is 100 kg/ha (May 10th 2018 and May 8th 2019). Samples for the analysis of vitamin C and nitrate content, as well as yield determination, were carried out at the stage of the technological maturity of lettuce (60-62 days after seedling). The average weight of lettuce, depending on the variety, varied in the range of 211.3 g to 258.7 g. The use of ammonium nitrate resulted in the highest average weight of lettuce head (246.7 g), followed by the use of urea (238.9 g) and the lowest by the use of ammonium sulphate (221.0 g). The nutritional value of lettuce (vitamin C content) shows that depending on the applied form of nitrogen in the fertilizer, the highest content of vitamin C was determined by urea (10.86 mg/100 g), then ammonium sulphate (9.61 mg/100 g), and the lowest by ammonium nitrate (7.38mg/100g). The lower content of vitamin C was found in varieties of lettuce with red leaves compared to varieties with green leaves. The accumulation of nitrate in lettuce leaves directly depends on the variety and the applied fertilizer. The highest nitrate content was with ammonium nitrate (2355.6 mg/kg). The accumulation of nitrate in lettuce varieties with red leaves was higher compared to varieties with green leaves. Keywords: Lettuce, Nitrate, Vitamin C, Yield, Open field
Генетичка анализа комбинационих способности дијаметра црног лука
(ИНСТИТУТ ЗА ПОВРТАРСТВО СМЕДЕРЕВСКА ПАЛАНКА, 2021) Pavlović, Nenad; Mladenović, J.; Tomić, Dalibor; Marjanović, Miloš; Madić, M.; Zdravković, Jasmina
Црни лук спада у ред економски најзначајнијег поврћа које се гаји како у Србији тако и на светском нивоу. Дијаметар свежих луковица црног лука спада у ред његових најважнијих агрономских особина због тога што директно утиче на принос и облик. Обе наведен особине имају изузетно важан како биолошки тако и економски значај. Како бисе утврдила генетска детерминисаност дијаметра луковице, постављен је оглед по случајном блок систему у пет понављања, на огледном пољу Института за повртарство. Примењен је метод диалелног укрштања без реципрочног. Генетичком анализом комбинационих способности испитиваних генотипова у овом експерименту, утврђено је постојање сигнификантне вредности за опште комбинационе способности (ОКС). Израчунате вредности за ОКС указују на преовлађујући утицај адитивних гена у наслеђивању дијаметра луковица црног лука, што значи да супериорне линије могу бити искоришћене у оплемењивачким програмима за повећање фреквенције жељених алела са адитивним ефектом.