Periodica Polytechnica Chemical Engineering最新文献_第4页

The Effects of Different Solvents on Phenolic, Flavonoid, Anthocyanin Contents and Free Radical Scavenging Activity on Pomegranate Juice and Seeds 不同溶剂对石榴汁和石榴籽中酚类、类黄酮、花青素含量及自由基清除活性的影响

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2024-02-05 DOI: 10.3311/ppch.21901

Erzsébet Varga, Noémi Birtalan, Abdulnabi Abushita, Ibolya Fülöp

{"title":"The Effects of Different Solvents on Phenolic, Flavonoid, Anthocyanin Contents and Free Radical Scavenging Activity on Pomegranate Juice and Seeds","authors":"Erzsébet Varga, Noémi Birtalan, Abdulnabi Abushita, Ibolya Fülöp","doi":"10.3311/ppch.21901","DOIUrl":"https://doi.org/10.3311/ppch.21901","url":null,"abstract":"Our phytochemical investigation defined the polyphenol, anthocyanin and flavonoid content from methanolic, ethanolic 50% and watery extracts from fresh pomegranate juice and seeds with a spectrophotometric method. The antioxidant capacity was defined with the ABTS and DPPH methods. We determined the polyphenols with the Folin-Ciocalteu method, the anthocyanins with the method in Hungarian Pharmacopoeia VIIIth edition at Myrtilli fructus monography and the flavonoids with a modified method of the Romanian Pharmacopeia Xth edition Cynarae folium monography. We expressed the concentration of polyphenols in gallic acids (GA). The values indicated the following: in fruit juice, 47.57 μg GA/ml, in methanol seed extract 7 μg GA/g, the ethanol 50% and in watery seed extracts 8 μg GA/g. The definition of flavonoids indicated the following values expressed in quercetin (QE): in fruit juice 706 μg QE/ml, in methanol seed extract 416 μg QE/g, in ethanol 50% seed extract 46 μg QE/g and in watery seed extract 57 μg QE/g. The anthocyans from juice 3.95 mg/100 ml and seed 6.47 mg/100 g expressed in cyanidin-3-0-glycoside. We determined the following values with the ABTS method: the antioxidant capacity of juice is 25.40 μg/ml, in methanol seed extract 2.87 μg/ml, in ethanol seed extract 2.52 μg/ml, in watery 9.15 μg/ml. With the DPPH method, we obtained the following values: from juice 54.2 μg/ml, from methanolic extract 14.7 μg/ml, from ethanolic extract 10.58 μg/ml and watery extract 18.22 μg/ml. The received data shows the importance of pomegranate, which can be a new phytotherapeutic potential resource.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139864682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phytochemical Profiles, in vitro Antioxidants, and Anti-inflammatory Activities of Flowers and Leaves of Lantana camara L. Grown in South of Tunisia 生长在突尼斯南部的 Lantana camara L.花和叶的植物化学特征、体外抗氧化剂和抗炎活性

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2024-01-31 DOI: 10.3311/ppch.22159

Khadija Ben Othman, Najeh Maaloul, Sana Nhidi, Mohamed Majdi Cherif, Sourour Idoudi, W. Elfalleh

{"title":"Phytochemical Profiles, in vitro Antioxidants, and Anti-inflammatory Activities of Flowers and Leaves of Lantana camara L. Grown in South of Tunisia","authors":"Khadija Ben Othman, Najeh Maaloul, Sana Nhidi, Mohamed Majdi Cherif, Sourour Idoudi, W. Elfalleh","doi":"10.3311/ppch.22159","DOIUrl":"https://doi.org/10.3311/ppch.22159","url":null,"abstract":"The current study assesses the photochemical profiles, the in vitro antioxidant (2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS), reducing power ferric and silver nanoparticule) and anti-inflammatory activity of Lantana camara L. leaves and flowers collected from the South of Tunisia. Bioactive extracts of two organs were prepared through an ultrasound-assisted extraction in ethanol. Herein, multivariate statistical analysis was performed to define the relationship between biological activities and the bioactive molecules content and composition. Phytochemical profiling showed higher phenolic and flavonoids contents in leaves extracts than in those obtained from flowers, while the condensed tannins was absent in both organs. LC-MS analysis identified 16 and 15 phenolic compounds from flowers and leaves extracts, respectively. The flowers extract was especially rich in Kaempferol, luteolin-7-O-glucoside, quinic acid and apigenin-7-O-glucoside. Kaempferol, luteolin-7-O-glucoside, quinic acid and syringic acid were identified as the prevalent compounds in leaves extract. The latter exhibited the highest DPPH and ABTS radical scavenging potentials. Whereas flowers extracts revealed the highest reducing potential of ferric and silver ions. However, the leaves and flowers extracts are unable to protect bovine serum albumin (BSA) from thermal denaturation. Furthermore, significant correlations (p < 0.05) were recorded between phytochemical profile and biological activities, as well as between different antioxidant studied assays. The obtained results present practical data for the potential application of L. camara as a sustainable source of multi-functional molecules in food and medicinal industries.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140474624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determining the Quintet Lifetimes in Side-ring Substituted [Fe(terpy)2]2+ Complexes 确定侧环取代[Fe(terpy)2]2+配合物中的五重奏寿命

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-11-16 DOI: 10.3311/ppch.22748

Andor Vancza, Marcell Levente Kapta, Mariann Papp, György Vankó, Tamás Keszthelyi

{"title":"Determining the Quintet Lifetimes in Side-ring Substituted [Fe(terpy)2]2+ Complexes","authors":"Andor Vancza, Marcell Levente Kapta, Mariann Papp, György Vankó, Tamás Keszthelyi","doi":"10.3311/ppch.22748","DOIUrl":"https://doi.org/10.3311/ppch.22748","url":null,"abstract":"We previously studied the effect of 4' substitution in iron(II)-bis-terpyridine complexes, showing that the photoexcited high-spin quintet-state is stabilized by electron-donating substituents. In this paper we explore the effects of electron-donating ( X = NH2 , Cl ) and withdrawing ( X = NO2 ) substituents in the 5,5\" positions on the stability and lifetime of the quintet-state. We used a simple densitiy-functional theory (DFT) based method that had been proven fairly accurate in the case of 4' substitution to estimate the energy barrier of the quintet-singlet transition and thereby predict the quintet state lifetime. We synthetized the complexes and used ultrafast transient optical absorption spectroscopy to experimentally determine the quintet lifetimes, in order to test the applicability of these quantum-chemistry based predictive methods for these side-ring substitution cases. UV-Visible spectra of the complexes have shown that the metal-to-ligand charge transfer (MLCT) and ligand-localized transitions of these complexes change according to the previous observations. We have shown that in the 5,5\" positions, electron withdrawing groups stabilize the quintet state, while donating groups destabilize it. This is in stark contrast to the effects previously observed for the 4' case, and indicates that unlike the latter case, the simple concept of inductive and mesomeric effects may not be adequate to describe the changes due to 5,5\" substitution, warranting further study of the area.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139270413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research in Industrial Use of Ion Exchange and Simulation 离子交换和模拟的工业应用研究

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-11-16 DOI: 10.3311/ppch.22490

G. Pátzay, Emil Csonka

{"title":"Research in Industrial Use of Ion Exchange and Simulation","authors":"G. Pátzay, Emil Csonka","doi":"10.3311/ppch.22490","DOIUrl":"https://doi.org/10.3311/ppch.22490","url":null,"abstract":"We investigated the industrial use of ion exchange technology as well as the modeling of fixed bed, multicomponent ion exchange processes. In this paper we report on both fields of this research. We have developed a complex technology for the selective separation of the long-live radionuclides and the partial recycling of boric acid from radioactive evaporator bottom residue. A wastewater treatment system has been developed by using a cesium-selective inorganic ion exchanger. The selective separation of 137Cs, 134Cs from high salt concentration and strongly alkaline evaporator bottom residue in Paks NPP has a volume reduction factor of about 3500–6500 at the value of the decontamination factor DF > 100, for the samples of four evaporator bottom residue tanks of the NPP. Some important classes of ion exchangers do possess uniform internal pore structures and bring all parts of the solíd structure into much closer contact with the liquid. Such materials are porous organic resins. For these types of exchangers, we have modified Mansour's multicomponent adsorption model and developed a computer program to describe multicomponent breakthrough, cocurrent, and counter-current elution curves for ion exchangers. In addition, we have developed a subroutine for the calculation of multicomponent ion exchange kinetics according to Nernst-Planck equation and successfully tested it. This subroutine will be added to the multicomponent ion exchange breakthrough and elution simulation program to have a real multicomponent ion exchange simulation program. In this paper we report about these research results too.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139268729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tiered Approach for Assessing the Effective and Safe Applicability of Beech Wood Biochar for Soil Improvement 评估榉木生物炭在土壤改良中的有效和安全应用的分层方法

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-11-16 DOI: 10.3311/ppch.22844

Szabina Molnár, Dalma Szombathy, E. Vaszita, Mónika Molnár

{"title":"Tiered Approach for Assessing the Effective and Safe Applicability of Beech Wood Biochar for Soil Improvement","authors":"Szabina Molnár, Dalma Szombathy, E. Vaszita, Mónika Molnár","doi":"10.3311/ppch.22844","DOIUrl":"https://doi.org/10.3311/ppch.22844","url":null,"abstract":"The soil degradation processes may cause long-term serious problems in various areas of life on Earth, thus mitigation of these processes by environmental-friendly, innovative soil protection methods is necessary. Biochar produced from organic wastes or by-products by pyrolysis may have several positive properties as additive in soil improvement technologies. In our complex research applying a tiered approach we assessed the main properties of a beech-wood biochar produced from a high volume by-product of a food industry technology. Then we studied in 4-months microcosm experiments the applicability of this biochar as amendment mixed into an acidic, degraded sandy soil. In addition, to forecast the long-term effects of the biochar, artificial physical and biological aging experiments were conducted.Based on the results, the beech-wood biochar was able to shift the acidic pH of the soil to the alkaline range and the electric conductivity of the soil increased with incremental biochar doses. Biochar addition significantly increased the microbial activity, as well. The results had clearly shown that during the mid-term experiment not even the highest biochar dose (15%) had inhibitive effect, but it rather improved several soil parameters. Furthermore, the biochar had positive effect on the soil water holding capacity, and the available soil nutrient and organic matter content. The results of the aging experiments generally showed also favourable effects and demonstrated that the aging-mediated changes differed according to the soil types. Therefore, we have concluded that biochar application requires a char by char and soil by soil testing prior to field application.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139269047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Teszt_10.26_Accept 测试_10.26_接受

4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-10-26 DOI: 10.3311/ppch.23606

Author Teszt, Alma Véghseő

引用次数: 0

Crystalline Forms of 4,4'-Methylenediantipyrine: Crystallographic Unit Cell for the Anhydrous Form, from Laboratory Powder XRD Pattern by DASH Program Package 4,4′-亚甲二安替比林的结晶形态:无水形态的结晶单元，由DASH程序包从实验室粉末XRD图中得到

4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-10-16 DOI: 10.3311/ppch.22950

Dorottya Fruzsina Bánhegyi, János Madarász, Elemér Fogassy, Emese Pálovics, György Pokol

引用次数: 0

Preparation of Highly Porous Scaffolds with Controllable Pore Size from Microbial Polyesters 微生物聚酯制备孔径可控的高孔支架

4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-10-10 DOI: 10.3311/ppch.22771

Péter Polyák, Ágoston Tóth, Dóra Tátraaljai

{"title":"Preparation of Highly Porous Scaffolds with Controllable Pore Size from Microbial Polyesters","authors":"Péter Polyák, Ágoston Tóth, Dóra Tátraaljai","doi":"10.3311/ppch.22771","DOIUrl":"https://doi.org/10.3311/ppch.22771","url":null,"abstract":"Microbial polyesters saw limited use in the field of tissue engineering, even though the biocompatibility of these polymers makes them ideal candidates for this role. The primary factor that hinders the proliferation of microbial polyesters in this market is that their processing with conventional techniques, such as electrospinning or 3D printing, is challenging. However, the full potential of these biopolymers could still be utilized by applying unconventional manufacturing methods, such as those based on the concept of salt leaching. An implementation of this concept facilitates the production of scaffolds that simultaneously have high porosity and excellent permeability. Moreover, the average pore size can also be varied in the range from 50 to 400 µm, which was reported to be optimal for the cultivation of eucaryotic cell cultures. By adjusting the pore size, the scaffold can be tailored to the eucaryotic cells the tissue consists of. Furthermore, we have developed an entirely new computational method for the approximation of the pore size distribution of the scaffolds. The method relies on 3D data reconstructed by the software of a digital optical microscope and also facilitates the modeling of the average pore size of scaffolds. Thus, besides the control of the pore size, our method enables its prediction as well.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136294806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two Acridone Units in One Crown Ether 一个冠醚里有两个吖啶酮

4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-09-27 DOI: 10.3311/ppch.22768

Panna Vezse, Dániel Ster, Ádám Golcs, Péter Huszthy, Tünde Tóth

引用次数: 0

Eco-friendly Synthesis of Novel Phosphorus Flame Retardants for Multiple Purposes 新型多用途磷系阻燃剂的环保合成

4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-09-25 DOI: 10.3311/ppch.22758

Beáta Szolnoki, Thuy Tien Nguyen Thanh, György Harakály

引用次数: 0