I. Gajić, L. Stanojević, A. Dinić, J. Stanojević, L. Nikolić, V. Nikolić, V. Savic
The aim of this study was to isolate the essential oil from ripe and disintegrated caraway fruit by Clevenger-type hydrodistillation, to determine its qualitative and quantitative composition and to examine its antioxidant activity, as well as to determine the qualitative and quantitative chemical composition of the caraway volatile compounds extracted by HS-SPME technique. The essential oil from disintegrated caraway fruit was obtained by Clevenger-type hydrodistillation with hydromodulus 1:10 m/V during 180 minutes. Volatile compounds from caraway fruit were extracted by headspace-solid phase microextraction (HS-SPME) using 75 μm fiber coated with Carboxen®/Polydimethylsiloxane (PDMS). The qualitative and quantitative composition of the essential oil and volatile compounds was determined by gas chromatography coupled with mass spectrometry (GC-MS) and flame ionization detection (GC-FID). Twenty-seven different compounds were separated and identified in the essential oil. Twenty-six compounds were identified in the volatiles extracted by HS-SPME. The most abundant compounds in both examined samples were limonene and carvone. The content of carvone in the essential oil was 72%, while the limonene content was 25.6%. In the volatiles obtained by HS-SPME, the limonene was present with 72.1% and carvone with 24.6%. The difference in the chemical composition is due to the oxidation of limonene to carvone during the hydrodistillation. The antioxidative activity of the caraway essential oil was determined by using DPPH assay immediately after adding DPPH radical and after 20 and 40 min of incubation with the radical. The caraway fruit essential oil showed a satisfactory antioxidant activity. The oil incubated for 40 min (EC50=4.6 mg/cm3) showed the best antioxidant activity.
本研究采用clevenger型加氢蒸馏法分离成熟和崩解的香菜果实精油，测定其定性和定量成分，考察其抗氧化活性，并利用HS-SPME技术对提取的香菜挥发物进行定性和定量化学成分的测定。采用clevenger型加氢蒸馏法，水模量为1:10 m/V，经180 min蒸馏法得到香菜果精油。采用顶空固相微萃取(HS-SPME)技术，利用75 μm纤维包覆Carboxen®/聚二甲基硅氧烷(PDMS)，从香菜果实中提取挥发性化合物。采用气相色谱-质谱联用(GC-MS)和火焰离子化检测器(GC-FID)对挥发油和挥发物进行定性和定量分析。从精油中分离鉴定出27种不同的化合物。用HS-SPME法从挥发物中鉴定出26个化合物。两种检测样品中含量最多的化合物是柠檬烯和香芹酮。精油中香芹酮含量为72%，柠檬烯含量为25.6%。HS-SPME法得到的挥发物中，柠檬烯含量为72.1%，香芹酮含量为24.6%。化学成分的差异是由于在加氢蒸馏过程中柠檬烯氧化成香芹酮。采用DPPH法测定香菜精油在加入DPPH自由基后、与DPPH自由基作用20 min和40 min后的抗氧化活性。葛缕子精油具有良好的抗氧化活性。孵育40 min (EC50=4.6 mg/cm3)的油脂抗氧化活性最好。
{"title":"The chemical composition of the essential oil and volatile compounds from caraway fruit (Carum carvi L.) extracted by headspace-solid phase microextraction and the antioxidant activity","authors":"I. Gajić, L. Stanojević, A. Dinić, J. Stanojević, L. Nikolić, V. Nikolić, V. Savic","doi":"10.5937/savteh2001037g","DOIUrl":"https://doi.org/10.5937/savteh2001037g","url":null,"abstract":"The aim of this study was to isolate the essential oil from ripe and disintegrated caraway fruit by Clevenger-type hydrodistillation, to determine its qualitative and quantitative composition and to examine its antioxidant activity, as well as to determine the qualitative and quantitative chemical composition of the caraway volatile compounds extracted by HS-SPME technique. The essential oil from disintegrated caraway fruit was obtained by Clevenger-type hydrodistillation with hydromodulus 1:10 m/V during 180 minutes. Volatile compounds from caraway fruit were extracted by headspace-solid phase microextraction (HS-SPME) using 75 μm fiber coated with Carboxen®/Polydimethylsiloxane (PDMS). The qualitative and quantitative composition of the essential oil and volatile compounds was determined by gas chromatography coupled with mass spectrometry (GC-MS) and flame ionization detection (GC-FID). Twenty-seven different compounds were separated and identified in the essential oil. Twenty-six compounds were identified in the volatiles extracted by HS-SPME. The most abundant compounds in both examined samples were limonene and carvone. The content of carvone in the essential oil was 72%, while the limonene content was 25.6%. In the volatiles obtained by HS-SPME, the limonene was present with 72.1% and carvone with 24.6%. The difference in the chemical composition is due to the oxidation of limonene to carvone during the hydrodistillation. The antioxidative activity of the caraway essential oil was determined by using DPPH assay immediately after adding DPPH radical and after 20 and 40 min of incubation with the radical. The caraway fruit essential oil showed a satisfactory antioxidant activity. The oil incubated for 40 min (EC50=4.6 mg/cm3) showed the best antioxidant activity.","PeriodicalId":7216,"journal":{"name":"Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76812641","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}
A. Milenković, J. Stanojević, Z. Stojanović-Radić, Milica G. Pejčić, D. Cvetković, J. Zvezdanović, L. Stanojević
Allspice (Pimenta dioica (L.) Merr.) fruit was used for the essential oil and ethanolic extract isolation in the present study. The essential oil was obtained by Clevenger-type hydrodistillation from allspice fructus with hydromodule 1:10 m/v during 180 minutes, while the ethanolic extract was obtained by reflux extraction at the boiling temperature with solvomodule 1:10 m/v during 120 minutes. The qualitative and quantitative composition of the essential oil was determined by GC/MS and GC/FID methods, respectively. The total phenolic and total flavonoid content in the extract was determined according to the Folin-Ciocalteu and aluminium chloride methods, respectively the antioxidant activity of allspice fructus essential oil and the extract was determined spectrophotometrically by DPPH assay and the antimicrobial activity using the microdilution method on the following microorganisms: two types of bacteria (Bacillus cereus, Salmonella spp.) and one yeast (Candida albicans), pairs of reference strains and their isolates. The obtained results proved the presence of 20 components in the essential oil, mainly oxygenated monoterpenes. The extract and essential oil have shown the best antioxidant activities after 20 and 60 minutes of incubation with EC50 values of 0.011 mg/cm³ and 0.023 mg/cm³, respectively. Both the essential oil and the extract have shown an inhibitory effect on all investigated microorganisms. Allspice ethanolic extract showed a better inhibitory effect on B. cereus and S. enterica (isolate and ATCC strains) than the essential oil. On the other side, allspice essential oil showed a better inhibitory effect on C. albicans strains. The results obtained indicate that both the essential oil and the extract isolated from allspice fructus are a good source of natural antioxidants and antimicrobial agents with potential applications in food and pharmaceutical industries as a safer alternative to the synthetic additives.
{"title":"Chemical composition, antioxidative and antimicrobial activity of allspice (Pimenta dioica (L.) Merr.) essential oil and extract","authors":"A. Milenković, J. Stanojević, Z. Stojanović-Radić, Milica G. Pejčić, D. Cvetković, J. Zvezdanović, L. Stanojević","doi":"10.5937/savteh2001027m","DOIUrl":"https://doi.org/10.5937/savteh2001027m","url":null,"abstract":"Allspice (Pimenta dioica (L.) Merr.) fruit was used for the essential oil and ethanolic extract isolation in the present study. The essential oil was obtained by Clevenger-type hydrodistillation from allspice fructus with hydromodule 1:10 m/v during 180 minutes, while the ethanolic extract was obtained by reflux extraction at the boiling temperature with solvomodule 1:10 m/v during 120 minutes. The qualitative and quantitative composition of the essential oil was determined by GC/MS and GC/FID methods, respectively. The total phenolic and total flavonoid content in the extract was determined according to the Folin-Ciocalteu and aluminium chloride methods, respectively the antioxidant activity of allspice fructus essential oil and the extract was determined spectrophotometrically by DPPH assay and the antimicrobial activity using the microdilution method on the following microorganisms: two types of bacteria (Bacillus cereus, Salmonella spp.) and one yeast (Candida albicans), pairs of reference strains and their isolates. The obtained results proved the presence of 20 components in the essential oil, mainly oxygenated monoterpenes. The extract and essential oil have shown the best antioxidant activities after 20 and 60 minutes of incubation with EC50 values of 0.011 mg/cm³ and 0.023 mg/cm³, respectively. Both the essential oil and the extract have shown an inhibitory effect on all investigated microorganisms. Allspice ethanolic extract showed a better inhibitory effect on B. cereus and S. enterica (isolate and ATCC strains) than the essential oil. On the other side, allspice essential oil showed a better inhibitory effect on C. albicans strains. The results obtained indicate that both the essential oil and the extract isolated from allspice fructus are a good source of natural antioxidants and antimicrobial agents with potential applications in food and pharmaceutical industries as a safer alternative to the synthetic additives.","PeriodicalId":7216,"journal":{"name":"Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81456749","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}
Marija Kodrić, Radica Kristić, I. Ristić, M. Nikodijević, D. Đorđević
Kinetics of the dyeing process of modified polyethylene terephthalate with disperse dye are shown in this paper. The modification of the fibers was performed with an aqueous solution of slaked lime with the simultaneous action of ultrasonic waves. The dyeing of the fibers was performed in a discontinuous-batch process, with a change in the initial dye concentration (20 120 mg dm-3) and dyeing time (5 60 min). Several kinetic reactions (Pseudo first, Avrami and Modified Freundlich) and diffusion models (Weber&Morris, Boyd, and Film diffusion) were used to test the experimental data from the dyeing process. It has been found that dyeing of modified fibers gives better results than dyeing of unmodified polyester, under the same conditions. With the increase of the initial dye concentration, a degree of exhaustion decreases (76,2 57,4 %, for equilibrium time of dyeing) and the absorption of disperse dyes per unit mass of fibers increases (1,5 6,9 mg g-1, for equilibrium time of dyeing). During the dyeing process, the initial concentration of the dye decreases, whereas the capacity of the adsorption increases. A linear simulation of the kinetic dyeing parameters showed that the Modified Freundlich reaction model dominated, while of the kinetic diffusion models the Boyd equation was most favorable.
{"title":"Kinetics of the adsorption of textile disperse dye to modified polyethylene terephthalate","authors":"Marija Kodrić, Radica Kristić, I. Ristić, M. Nikodijević, D. Đorđević","doi":"10.5937/savteh2001058k","DOIUrl":"https://doi.org/10.5937/savteh2001058k","url":null,"abstract":"Kinetics of the dyeing process of modified polyethylene terephthalate with disperse dye are shown in this paper. The modification of the fibers was performed with an aqueous solution of slaked lime with the simultaneous action of ultrasonic waves. The dyeing of the fibers was performed in a discontinuous-batch process, with a change in the initial dye concentration (20 120 mg dm-3) and dyeing time (5 60 min). Several kinetic reactions (Pseudo first, Avrami and Modified Freundlich) and diffusion models (Weber&Morris, Boyd, and Film diffusion) were used to test the experimental data from the dyeing process. It has been found that dyeing of modified fibers gives better results than dyeing of unmodified polyester, under the same conditions. With the increase of the initial dye concentration, a degree of exhaustion decreases (76,2 57,4 %, for equilibrium time of dyeing) and the absorption of disperse dyes per unit mass of fibers increases (1,5 6,9 mg g-1, for equilibrium time of dyeing). During the dyeing process, the initial concentration of the dye decreases, whereas the capacity of the adsorption increases. A linear simulation of the kinetic dyeing parameters showed that the Modified Freundlich reaction model dominated, while of the kinetic diffusion models the Boyd equation was most favorable.","PeriodicalId":7216,"journal":{"name":"Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88093540","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}
M. Vladimirov, V. Nikolić, L. Stanojević, L. Nikolić, Ana Tačić
The common birch (Betula pendula Roth., Betulaceae) is widespread in moderate and northern climatic zones. It is used in traditional medicine of many countries, and its positive effects on human health were recognized a long time ago. It belongs to a group of medicinal plants. Numerous studies on the chemical composition and activity of the birch isolates are aimed at confirming their biological effects and the use in traditional medicine. A large number of bioactive compounds have been isolated from buds, juice (sap), leaves and bark of common birch. The composition varies depending on the variety, age of the plant, geographical area, the methods of isolation and the analysis used. However, the chemical composition of the isolates has been partially studied, and further investigations are required. Anti-inflammatory, antimicrobial, antiviral, antioxidant, antiproliferative, antirheumatoid, uteroprotective, antiallergic and gastroprotective activity of the isolates have been established. That opens the possibility of its potential use in the prevention and treatment of a wide spectrum of diseases. Further preclinical and clinical studies are needed in order to create and apply preparations based on common birch isolates.
{"title":"Common birch (Betula pendula Roth.): Chemical composition and biological activity of isolates","authors":"M. Vladimirov, V. Nikolić, L. Stanojević, L. Nikolić, Ana Tačić","doi":"10.5937/SAVTEH1901065V","DOIUrl":"https://doi.org/10.5937/SAVTEH1901065V","url":null,"abstract":"The common birch (Betula pendula Roth., Betulaceae) is widespread in moderate and northern climatic zones. It is used in traditional medicine of many countries, and its positive effects on human health were recognized a long time ago. It belongs to a group of medicinal plants. Numerous studies on the chemical composition and activity of the birch isolates are aimed at confirming their biological effects and the use in traditional medicine. A large number of bioactive compounds have been isolated from buds, juice (sap), leaves and bark of common birch. The composition varies depending on the variety, age of the plant, geographical area, the methods of isolation and the analysis used. However, the chemical composition of the isolates has been partially studied, and further investigations are required. Anti-inflammatory, antimicrobial, antiviral, antioxidant, antiproliferative, antirheumatoid, uteroprotective, antiallergic and gastroprotective activity of the isolates have been established. That opens the possibility of its potential use in the prevention and treatment of a wide spectrum of diseases. Further preclinical and clinical studies are needed in order to create and apply preparations based on common birch isolates.","PeriodicalId":7216,"journal":{"name":"Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75717243","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}
S. Savić, S. Petrović, M. Petronijević, A. Cvetanović, Ž. Petronijević
Spices represent all edible plant parts used for food flavouring or colouring including fruits, roots, seeds, peels or vegetable substances. The objective of this study was to determine the elemental composition (Ag, Al, B, Ba, Bi, Ca, Cd, Co, Cr, Cu, Fe, In, K, Li, Mg, Mn, Na, Ni, Pb, Sr, Tl and Zn) of selected spices available in the local markets on Serbian territory. The presence of heavy metals in spices is of particular importance because this could result in the accumulation of these elements in human organs, which further might cause different health problems. The analysed spice samples were curcuma, star anise, cinnamon, ginger, coriander, cardamom, sesame, black pepper, chilli and curry. The preparation of the samples was done by wet digestion. The concentrations of elements after digestion were determined by Inductively Coupled Plasma ‒ Optical Emission Spectrometry (ICP-OES). In the group of spices macroelements, from all examined elements the calcium concentration was the highest (182.25 ‒ 3968.79 mg/kg), about 83%. From the heavy metals group, aluminium was most present in the range of 0.0-10.78 mg/kg, while cadmium and nickel were detected in almost negligible amounts.
{"title":"Determination of the mineral content of spices by ICP-OES","authors":"S. Savić, S. Petrović, M. Petronijević, A. Cvetanović, Ž. Petronijević","doi":"10.5937/SAVTEH1901027S","DOIUrl":"https://doi.org/10.5937/SAVTEH1901027S","url":null,"abstract":"Spices represent all edible plant parts used for food flavouring or colouring including fruits, roots, seeds, peels or vegetable substances. The objective of this study was to determine the elemental composition (Ag, Al, B, Ba, Bi, Ca, Cd, Co, Cr, Cu, Fe, In, K, Li, Mg, Mn, Na, Ni, Pb, Sr, Tl and Zn) of selected spices available in the local markets on Serbian territory. The presence of heavy metals in spices is of particular importance because this could result in the accumulation of these elements in human organs, which further might cause different health problems. The analysed spice samples were curcuma, star anise, cinnamon, ginger, coriander, cardamom, sesame, black pepper, chilli and curry. The preparation of the samples was done by wet digestion. The concentrations of elements after digestion were determined by Inductively Coupled Plasma ‒ Optical Emission Spectrometry (ICP-OES). In the group of spices macroelements, from all examined elements the calcium concentration was the highest (182.25 ‒ 3968.79 mg/kg), about 83%. From the heavy metals group, aluminium was most present in the range of 0.0-10.78 mg/kg, while cadmium and nickel were detected in almost negligible amounts.","PeriodicalId":7216,"journal":{"name":"Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87692652","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}
Restoring the morpho-functional capacity of destroyed and compensations of lost teeth present a challenge for the synthesis of new more effective materials and the improvement of those already on the market. The aim of the manuscript was to present the advantages and disadvantages of contemporary acrylic polymers, dental ceramics, and composites, based on literature data and published research results. The choice of the adequate material is crucial for making not only dental but any product. The synthesis of new materials and the development of new technological procedures have accelerated the advancement of dentistry. Therefore, today's dental compensations faithfully imitate natural teeth and can fully perform their intended function.
{"title":"Contemporary dental materials","authors":"M. Kostić, L. Nikolić","doi":"10.5937/SAVTEH1901078K","DOIUrl":"https://doi.org/10.5937/SAVTEH1901078K","url":null,"abstract":"Restoring the morpho-functional capacity of destroyed and compensations of lost teeth present a challenge for the synthesis of new more effective materials and the improvement of those already on the market. The aim of the manuscript was to present the advantages and disadvantages of contemporary acrylic polymers, dental ceramics, and composites, based on literature data and published research results. The choice of the adequate material is crucial for making not only dental but any product. The synthesis of new materials and the development of new technological procedures have accelerated the advancement of dentistry. Therefore, today's dental compensations faithfully imitate natural teeth and can fully perform their intended function.","PeriodicalId":7216,"journal":{"name":"Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88817742","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}
Marija Stevanović, J. Zvezdanović, L. Stanojević, J. Stanojević, S. Petrović, M. Cakic, D. Cvetković
{"title":"Synthesis, characterization and antioxidant activity of silver nanoparticles stabilized by aqueous extracts of wild blackberry (Rubus spp.) and raspberry (Rubus idaeus L.) leaves","authors":"Marija Stevanović, J. Zvezdanović, L. Stanojević, J. Stanojević, S. Petrović, M. Cakic, D. Cvetković","doi":"10.5937/SAVTEH1901047S","DOIUrl":"https://doi.org/10.5937/SAVTEH1901047S","url":null,"abstract":"","PeriodicalId":7216,"journal":{"name":"Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84318921","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}
In this study, three tetracyclic triterpenes: (3S,24S)-tirucall-7-ene-3,24,25-triol (1), (3S,24R)-tirucall-7-ene-3,24,25-triol (2) and inoterpene C (3), were isolated from the milkweed Euphorbia nicaeensis All. using dry-column flash silica gel chromatography and semipreparative normal-phase HPLC. Their structures were determined on the basis of 1D and 2D NMR spectra and literature review. Although these three compounds have previously been isolated from other plant species, this is the first time that they have been isolated from E. nicaeensis.
{"title":"Tetracyclic triterpenoids from Euphorbia nicaeensis All","authors":"G. Krstić, M. Novaković, M. Jadranin, V. Tešević","doi":"10.5937/savteh1902037k","DOIUrl":"https://doi.org/10.5937/savteh1902037k","url":null,"abstract":"In this study, three tetracyclic triterpenes: (3S,24S)-tirucall-7-ene-3,24,25-triol (1), (3S,24R)-tirucall-7-ene-3,24,25-triol (2) and inoterpene C (3), were isolated from the milkweed Euphorbia nicaeensis All. using dry-column flash silica gel chromatography and semipreparative normal-phase HPLC. Their structures were determined on the basis of 1D and 2D NMR spectra and literature review. Although these three compounds have previously been isolated from other plant species, this is the first time that they have been isolated from E. nicaeensis.","PeriodicalId":7216,"journal":{"name":"Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81762163","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}
G. Nikolić, Dragana Marković-Nikolić, M. Kostić, Miloš Durmišević, M. Cakic
The aim of this study is to develop miscellaneous cationic sorbents based on the lignocellulosic biomass of Lagenaria vulgaris fruit, with the property of efficient sorption of anionic pollutants from aqueous solutions. The lignocellulosic gourd shell (LGS biomass), as a potentially valuable agro-waste, was examined and used for the synthesis of sorbents. The preparation of synthesis precursor (LVAT) was performed by alkaline pretreatment of LGS biomass. Pretreatment under weak alkaline conditions with green carbonate solution was carried out for partial delignification and extraction of depolymerized hemicellulose, thereby achieving higher material porosity and activation of cellulose microfibrils. This activation involves the translation of available –OH functional groups into –ONa form (alkali-cellulose), while maintaining the initial biomass composition. Synthesis of the cationic sorbents was performed in three ways. Different N-reagents, such as tertiary amino and quaternary ammonium compounds, were used in the cation modification of LGS biomass and LVAT precursor, to determine the effects of reagent structure and hydrophobicity on the synthesis outcome, and primarily on the sorption properties of the resulting sorbents. The synthesized cationic sorbents were characterized by physico-chemical methods and tested for the removal of anionic pollutants from water, especially phosphates and nitrates. The various chemical modifications of lignocellulosic biomass provide a scientific contribution to a better understanding of the mechanism of anions sorption on the sorbent surface.
{"title":"Development and characterisation of miscellaneous cationic sorbents based on lignocellulosic gourd shell","authors":"G. Nikolić, Dragana Marković-Nikolić, M. Kostić, Miloš Durmišević, M. Cakic","doi":"10.5937/savteh1902046n","DOIUrl":"https://doi.org/10.5937/savteh1902046n","url":null,"abstract":"The aim of this study is to develop miscellaneous cationic sorbents based on the lignocellulosic biomass of Lagenaria vulgaris fruit, with the property of efficient sorption of anionic pollutants from aqueous solutions. The lignocellulosic gourd shell (LGS biomass), as a potentially valuable agro-waste, was examined and used for the synthesis of sorbents. The preparation of synthesis precursor (LVAT) was performed by alkaline pretreatment of LGS biomass. Pretreatment under weak alkaline conditions with green carbonate solution was carried out for partial delignification and extraction of depolymerized hemicellulose, thereby achieving higher material porosity and activation of cellulose microfibrils. This activation involves the translation of available –OH functional groups into –ONa form (alkali-cellulose), while maintaining the initial biomass composition. Synthesis of the cationic sorbents was performed in three ways. Different N-reagents, such as tertiary amino and quaternary ammonium compounds, were used in the cation modification of LGS biomass and LVAT precursor, to determine the effects of reagent structure and hydrophobicity on the synthesis outcome, and primarily on the sorption properties of the resulting sorbents. The synthesized cationic sorbents were characterized by physico-chemical methods and tested for the removal of anionic pollutants from water, especially phosphates and nitrates. The various chemical modifications of lignocellulosic biomass provide a scientific contribution to a better understanding of the mechanism of anions sorption on the sorbent surface.","PeriodicalId":7216,"journal":{"name":"Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82235964","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}
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