Acta Periodica Technologica最新文献_第9页

Bulgária és Horvátország útja az euro bevezetése felé

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.47273/ap.2021.23.97-110

L. Vigh

引用次数: 0

The analysis of chromatographic behavior of homoandrostane derivatives in reversed-phase ultra-high performance liquid chromatography 反相超高效液相色谱法分析同雄甾烷衍生物的色谱行为

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.2298/apt2152147k

Strahinja Z. Kovačević, Milica Karadzic-Banjac, J. Anojčić, L. Jevric, S. Podunavac-Kuzmanovic, S. Gadžurić, Marina P. Savić, Ivana Z. Kuzminac, Andrea R. Nikolić, M. Sakac

{"title":"The analysis of chromatographic behavior of homoandrostane derivatives in reversed-phase ultra-high performance liquid chromatography","authors":"Strahinja Z. Kovačević, Milica Karadzic-Banjac, J. Anojčić, L. Jevric, S. Podunavac-Kuzmanovic, S. Gadžurić, Marina P. Savić, Ivana Z. Kuzminac, Andrea R. Nikolić, M. Sakac","doi":"10.2298/apt2152147k","DOIUrl":"https://doi.org/10.2298/apt2152147k","url":null,"abstract":"Homoandrostane derivatives, as compounds with significant bioactivity, were studied in terms of their chromatographic behavior in reversed-phase ultra-high performance liquid chromatography (RP-UHPLC). In the present study, five androstane derivatives from the series of homoandrostanes were analyzed, including: 3?-hydroxy-17-oxa-17a-homoandrost-5-en-16-one, 3?,5?-dihydroxy-17- oxa-17a-homoandrostane-6,16-dione, 17-oxa-5?,6?-epoxy-17a-homoandrostane-3,16-dione, 5?-hydroxy- 17-oxa-17a-homoandrostane-6,16-dione-3?-yl acetate and 3?-hydroxy-17-oxa-5?,6?-epoxy-Dhomoandrostan- 16-one. The compounds were analyzed by applying methanol-water mobile phases with different volume fractions of methanol, as a polar protic solvent, and logk0 parameters of each compound were determined. The outstanding correlations between in silico logP descriptors and logk0 parameters were obtained, as well as between in silico logD descriptors and logk0 parameters. The logk0 parameters are very well correlated with polar surface area (PSA) descriptor as well. The studied compounds and lipophilicity descriptors (including the chromatographic lipophilicity parameters - logk0) were clustered applying hierarchical cluster analysis (HCA) in the form of clustered heat map known as double dendrogram. Furthermore, the sum of ranking differences (SRD) method was used for the ranking of the lipophilicity measures of the analyzed homoandrostane derivatives so the most suitable lipophilicity measures of this series of compounds can be selected.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68412003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Járműtrajektóriák definiálásához szükséges határértékek meghatározása klasszikus módszerekkel

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.47273/ap.2021.23.37-45

Péter Ficzere, Lajos Borbás

引用次数: 0

In vivo and in vitro antidiabetic properties of alkaloids extract from Salvia chudaei 丹参生物碱提取物体内外抗糖尿病特性研究

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.2298/apt2152045t

M. Tlili, Roukia Hammoudi, M. Hadj-Mahammed

{"title":"In vivo and in vitro antidiabetic properties of alkaloids extract from Salvia chudaei","authors":"M. Tlili, Roukia Hammoudi, M. Hadj-Mahammed","doi":"10.2298/apt2152045t","DOIUrl":"https://doi.org/10.2298/apt2152045t","url":null,"abstract":"The aim of this study was to evaluate, for the first time, the antidiabetic effect of the alkaloids extract of Salvia chudaei Batt. & Trab. (Lamiaceae) on alloxan-induced diabetic rats. The alkaloids extract was prepared, and the in vitro inhibitory effect of key digesting enzymes related to postprandial hyperglycemia were determined. After acute toxicity test, the Swiss albino rats were induced with alloxan to get experimental diabetes animals. The fasting mean blood glucose, lipid profile, different liver and kidney function biomarkers and antioxidant biomarkers levels, after treatment for 30 days, diabetic untreated and diabetic rats treated with alkaloids extract were estimated. The alkaloids displayed remarkable in inhibiting ?-glucosidase (IC50 = 248.25?2.61 ?g/ml) than ?-amylase (IC50 = 262.96?9.64 ?g/ml) activities. In vivo, the results proved that alkaloids extract at dose of 500 mg/kg bw decreased significantly the blood glucose, lipid profile levels and improved the liver and kidney function biomarkers and increased the activities of antioxidant enzymes (superoxide dismutase and gluthatione reductase). This study demonstrates, that alkaloids are effective in inhibiting hyperglycemia and oxidative stress caused by diabetes.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrasound-assisted creep deformation of metals 超声辅助金属蠕变变形

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.2298/apt2152265r

A. Rusinko, Ali H. Alhilfi

引用次数: 0

Characterization of carbide lime waste: A comparative study for acid soil stabilization 碳化石石灰废弃物的特性:酸性土壤稳定的比较研究

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.2298/apt2152013a

Wafa Atma, F. Souahi

引用次数: 1

Functional handmade minions - consumers and experienced tasters sensory evaluation of the new product 功能性手工小黄人——消费者和经验丰富的品酒师对新产品的感官评价

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.2298/apt2152217p

J. Popov-Raljic, I. Blešić, Milan Ivkov, M. Petrović, T. Gajić, M. Aleksić

{"title":"Functional handmade minions - consumers and experienced tasters sensory evaluation of the new product","authors":"J. Popov-Raljic, I. Blešić, Milan Ivkov, M. Petrović, T. Gajić, M. Aleksić","doi":"10.2298/apt2152217p","DOIUrl":"https://doi.org/10.2298/apt2152217p","url":null,"abstract":"The study examines consumer sensory preferences of 12 different handmade pastry products in the form of minions, made of rice and flaxseed flour, tapioca starch with natural taste ingredients and with addition of prebiotic (inulin), herbs and other ingredients. The sensory evaluation was performed by professionals (experienced tasters). Preferred minion flavour was tested at group of 324 consumers (hotel guests) of different nationality. ANOVA and t-test were performed to reveal differences in attitudes related to socio-demographic characteristics of the consumers. Also, determination of taste preferences according to consumer nationality was examined as an additional consumer care aspect. The evaluation of equality of the samples? average rates, as well as the groups of minions, is done by parametric or nonparametric model of variance analysis. Principal component analysis (PCA) was applied in order to group the investigated minions regarding their sensory properties, while the sum of ranking differences (SRD) was used to determine the minions with the best sensory properties. Consumers and experienced tasters have almost the same opinion about the sensory quality of minions, which indicates that assessment of the consumer can be considered as a representative opinion in the near future. Such functional food - minions could be widely used as a substitute for the most common commercial sweets rich in sugar and fat.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68412079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Antioxidant and antimicrobial capacity of encapsulated thyme essential oil in alginate and soy protein-based carriers 包封百里香精油在海藻酸盐和大豆蛋白载体中的抗氧化和抗菌能力

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.2298/apt2152001v

Mina Volić, Verica B Djordjević, M. Vukasinovic-Sekulic, Natasa Obradovic, Z. Knežević-Jugović, B. Bugarski

{"title":"Antioxidant and antimicrobial capacity of encapsulated thyme essential oil in alginate and soy protein-based carriers","authors":"Mina Volić, Verica B Djordjević, M. Vukasinovic-Sekulic, Natasa Obradovic, Z. Knežević-Jugović, B. Bugarski","doi":"10.2298/apt2152001v","DOIUrl":"https://doi.org/10.2298/apt2152001v","url":null,"abstract":"The aim of this study was to develop a stable hydrogel carrier system for thyme essential oil (TEO) that could protect its sensitive polyphenol compounds. The impact of wall material (soy protein and alginate) on encapsulation efficiency and thymol release in simulated gastrointestinal conditions, was investigated. The release of thymol was ~ 80 % and 20 % in simulated gastric and pancreatic solutions, respectively. Thyme essential oil plays an important role as an antimicrobial and antioxidant agent. Results indicated that encapsulated TEO inside the hydrogel matrix exhibited antioxidant activity demonstrated by CUPRAC and ABTS analysis, even after thermal treatment of the beads, indicating the metal chelate effect as dominant. In vitro antimicrobial activity of encapsulated TEO has been studied against several pathogenic microorganisms such as Escherichia coli, Staphylococcus aureus, Bacillus cereus and Candida albicans. Beads coded as Ca-A1.5/SP1.5 showed anti-Candida albicans activity, while modified bead formulations Ca-A1.5/SP1.5* and Ca-A1.5/SP0.25** showed bactericidal activity against Escherichia coli and Staphylococcus aureus.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Optimization of baker`s yeast production on grape juice using response surface methodology 响应面法优化葡萄汁面包酵母生产工艺

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.2298/apt2152089s

M. Sawsan, Ali Ali, Darwesh Ayhem, Zam Wissam

{"title":"Optimization of baker`s yeast production on grape juice using response surface methodology","authors":"M. Sawsan, Ali Ali, Darwesh Ayhem, Zam Wissam","doi":"10.2298/apt2152089s","DOIUrl":"https://doi.org/10.2298/apt2152089s","url":null,"abstract":"There is an increasing interest in improving biological processes, including fermentation processes, improving fermentation conditions is difficult, as it requires the use of an appropriate improvement method that allows operating the biological fermenter under optimal conditions in order to obtain the largest possible amount of the final product. The aim of this work was to succeed in examples of fermentation conditions to produce the largest possible quantity of dry yeast biomass Saccharomyces cerevisiae using grape juice as the sole carbon source. The optimum values of five factors that have an effect on the production of dry biomass from baker`s yeast were determined. The design of the experiments was carried out using the central composite experimental design (CCD) and the number of experiments according to the design was (54) experiments, the response surface methodology method was used to determine the best possible amount of production of yeast, and has reached (41.44 g/L) after 12 hours of fermentation, under the following optimal conditions (temperature (30.11??), pH (4.75), sugar concentration (158.36 g/L), the ratio of carbon to nitrogen (an essential nutrient for yeast growth ) is (11.9), initial concentration of yeasts (2.5 g/L), the amount of urea was 6.65 g/L and the amount of ammonium sulfate used was 6.65 g/L, so that the concentration of added urea and ammonium sulfate was (50-50)% and the required C/N ratio was achieved, and the used agitation speed was equal to 200 r.p.m during the fermentation process. The fermenter power of the obtained yeast was 470 ml. Three kinematic models (Monod, Verhulst, and Tessier) were also selected for the purpose of studying the kinetic performance of Saccharomyces cerevisiae yeast. Monod and Tessier`s models did not give satisfactory results, while the best results were according to the Verhulst model. Also, the Leudeking Piret model has also been successfully used to predict substrate consumption during fermentation time.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Chemical composition of essential oils of elderberry (Sambucus nigra L.) flowers and fruits 接骨木(Sambucus nigra L.)花和果实精油的化学成分

Acta Periodica Technologica Pub Date : 2021-01-01 DOI: 10.2298/apt2152229v

M. Vujanović, Sanja Djurovic, Marija Radojkovic

{"title":"Chemical composition of essential oils of elderberry (Sambucus nigra L.) flowers and fruits","authors":"M. Vujanović, Sanja Djurovic, Marija Radojkovic","doi":"10.2298/apt2152229v","DOIUrl":"https://doi.org/10.2298/apt2152229v","url":null,"abstract":"The majority of essential oils obtained from medicinal plants have been demonstrated to be effective in the treatment of different kinds of diseases, and they are increasingly used in the diet. Due to their chemical composition, essential oils are a very interesting product of the secondary metabolism of plants, for both consumers and researchers. Among others, elderberry (Sambucus nigra L.) is mostly a woody plant, while it can rarely be found as a herbaceous perennial plant. This plant species has been used in traditional medicine because it is a very rich source of phytochemicals. The aim of this study was to identify and compare the composition of essential oils obtained from flowers and fruits of this plant, collected from the Balkan Peninsula. The oils were obtained using the Clevenger apparatus, and their composition was evaluated by gas chromatography - mass spectrometry (GC-MS). The oil composition was affected by the part of the plants used: the most abundant bioactive compounds in the essential oil of air-dried elderberry fruits were ?-damascenone (35.70%) and linalyl anthranilate (24.15%). ?-damascenone was the dominant compound in the essential oil of lyophilized elderberry fruits (38.64%), while linalool was detected in the concentration of 32.80%. In the essential oil of air-dried elderflowers, the most abundant compound was carane (13.19%). The essential oils of S. nigra shown substantial chemical composition and could be used as a potential source of natural products in the cosmetics and food industry.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3