Pub Date : 2023-01-01DOI: 10.2298/hemind230113021m
K. Mihajlovski, Zeljka Stajcic, V. Lazić
The main goal of this work was to optimize the method of processing wound dressing products (like gauzes, sanitary pads, cotton wool, compresses, and bandages) with a commercial silver colloidal solution (Koloid doo, Belgrade, Serbia) and then to examine the antimicrobial properties of the obtained items in order to potentially reach the market with new improved wound dressing products. The influence of different silver concentrations used for treatment on antimicrobial activity was investigated only against Escherichia coli. The antimicrobial activity of different types of materials treated with silver solutions of 30 ppm was investigated against Gram-negative bacteria Escherichia coli and Pseudomonas aeruginosa, Gram-positive bacteria Staphylococcus aureus, Bacillus subtilis, and Enterococcus faecalis, as well as the fungus Candida albicans. The microbial reduction of the tested materials loaded with a silver solution of 30 ppm (15-20 ?g of Ag on 1 g of fabric) against the Gram-negative bacteria E. coli and P. aeruginosa was almost maximal after 2 h of contact (i.e. 95 and 99 %, respectively). In the case of Gram-positive bacteria S. aureus, B. subtilis, and E. faecalis, a longer time is needed to completely eradicate bacteria (over 99 %). Antifungal activity testing against the fungus C. albicans gave moderate antifungal activity results.
{"title":"Antimicrobial activity of different wound dressing products treated with silver","authors":"K. Mihajlovski, Zeljka Stajcic, V. Lazić","doi":"10.2298/hemind230113021m","DOIUrl":"https://doi.org/10.2298/hemind230113021m","url":null,"abstract":"The main goal of this work was to optimize the method of processing wound dressing products (like gauzes, sanitary pads, cotton wool, compresses, and bandages) with a commercial silver colloidal solution (Koloid doo, Belgrade, Serbia) and then to examine the antimicrobial properties of the obtained items in order to potentially reach the market with new improved wound dressing products. The influence of different silver concentrations used for treatment on antimicrobial activity was investigated only against Escherichia coli. The antimicrobial activity of different types of materials treated with silver solutions of 30 ppm was investigated against Gram-negative bacteria Escherichia coli and Pseudomonas aeruginosa, Gram-positive bacteria Staphylococcus aureus, Bacillus subtilis, and Enterococcus faecalis, as well as the fungus Candida albicans. The microbial reduction of the tested materials loaded with a silver solution of 30 ppm (15-20 ?g of Ag on 1 g of fabric) against the Gram-negative bacteria E. coli and P. aeruginosa was almost maximal after 2 h of contact (i.e. 95 and 99 %, respectively). In the case of Gram-positive bacteria S. aureus, B. subtilis, and E. faecalis, a longer time is needed to completely eradicate bacteria (over 99 %). Antifungal activity testing against the fungus C. albicans gave moderate antifungal activity results.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"133 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73833574","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}
Pub Date : 2023-01-01DOI: 10.2298/hemind220517006m
Maanvizhi Moorthi, Prakash Chidambram, R. Venugopal
This work aims to investigate the thermal comfort behaviour of polyester seamed fabric regarding the change in sewing thread filaments fineness for two different seam classes: seam 514 and seam 607. Five seamed fabric samples were constructed with using micro-denier polyester filament of 16.66 tex made of five different filament numbers (38, 48, 108, 144 and 288). It was noticed that the seam thermal properties, air and water vapour permeability, and wicking can be improved if the seam is constructed with using the micro-denier polyester sewing thread. It was also found that the investigated properties increase with the increase in the sewing thread filament fineness on the seam line. The statistical results have also shown that the sewing thread filament fineness is significantly affecting thermal behaviour of the seamed fabric.
{"title":"Study on thermal comfort behaviour of seams made of micro-denier polyester sewing thread for high active sportswear","authors":"Maanvizhi Moorthi, Prakash Chidambram, R. Venugopal","doi":"10.2298/hemind220517006m","DOIUrl":"https://doi.org/10.2298/hemind220517006m","url":null,"abstract":"This work aims to investigate the thermal comfort behaviour of polyester seamed fabric regarding the change in sewing thread filaments fineness for two different seam classes: seam 514 and seam 607. Five seamed fabric samples were constructed with using micro-denier polyester filament of 16.66 tex made of five different filament numbers (38, 48, 108, 144 and 288). It was noticed that the seam thermal properties, air and water vapour permeability, and wicking can be improved if the seam is constructed with using the micro-denier polyester sewing thread. It was also found that the investigated properties increase with the increase in the sewing thread filament fineness on the seam line. The statistical results have also shown that the sewing thread filament fineness is significantly affecting thermal behaviour of the seamed fabric.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82667342","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}
Pub Date : 2023-01-01DOI: 10.2298/hemind220724004t
Predrag Tasic, D. Trajković, J. Geršak
The research is focused on determining the influence of structural and constructional parameters of rib knitted fabrics on the thermal properties of men's socks. Men's socks are made in three different pattern constructions of three types of basic yarns: bamboo, cotton and a cotton/polyester blend with the additional filament polyamide yarn and wrapped rubber wire for the so-called render socks. For all analyzed sock rib patterns, the most important structural parameters of the yarn and construction parameters of the knitted fabrics were determined. Thermal properties of socks such as the cool touch feeling property, thermal conductivity, heat retention coefficient and thermal resistance were determined by using Thermal Labo and Thermal Mannequin measuring devices. The structural and constructional parameters of knitted fabrics were shown to affect the investigated thermal properties of the socks, making them more or less insulating or heat conducting. Values of the warm-cold feeling parameter as well as thermal conductivity vary depending on the construction pattern, showing a decrease as the number of face loops is increased i.e. in the sequence R1:1> R3:1> R7:1. The ability to retain heat decreases in the opposite sequence R7:1 > R3:1 > R1:1. The highest values of heat retention were determined for R7:1 rib knitted socks by both methods. A regression equation has been established with thickness, loop length, mass per unit area and porosity as independent variables, and thermal resistance (determined by the Thermo Labo method) as the dependent variable. The loop length and mass per unit area were shown to contribute significantly to the model.
{"title":"Influence of structural and constructional parameters of knitted fabrics on the thermal properties of men's socks","authors":"Predrag Tasic, D. Trajković, J. Geršak","doi":"10.2298/hemind220724004t","DOIUrl":"https://doi.org/10.2298/hemind220724004t","url":null,"abstract":"The research is focused on determining the influence of structural and constructional parameters of rib knitted fabrics on the thermal properties of men's socks. Men's socks are made in three different pattern constructions of three types of basic yarns: bamboo, cotton and a cotton/polyester blend with the additional filament polyamide yarn and wrapped rubber wire for the so-called render socks. For all analyzed sock rib patterns, the most important structural parameters of the yarn and construction parameters of the knitted fabrics were determined. Thermal properties of socks such as the cool touch feeling property, thermal conductivity, heat retention coefficient and thermal resistance were determined by using Thermal Labo and Thermal Mannequin measuring devices. The structural and constructional parameters of knitted fabrics were shown to affect the investigated thermal properties of the socks, making them more or less insulating or heat conducting. Values of the warm-cold feeling parameter as well as thermal conductivity vary depending on the construction pattern, showing a decrease as the number of face loops is increased i.e. in the sequence R1:1> R3:1> R7:1. The ability to retain heat decreases in the opposite sequence R7:1 > R3:1 > R1:1. The highest values of heat retention were determined for R7:1 rib knitted socks by both methods. A regression equation has been established with thickness, loop length, mass per unit area and porosity as independent variables, and thermal resistance (determined by the Thermo Labo method) as the dependent variable. The loop length and mass per unit area were shown to contribute significantly to the model.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89476132","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}
Pub Date : 2023-01-01DOI: 10.2298/hemind221222013l
Zorica R. Lopičić, Ana Antanasković, T. Šoštarić, Vladimir Adamović, M. Orlić, J. Milojković, M. Milivojevic
Peach stones, a valuable agro-industrial by-product available in many countries worldwide, comprise a renewable resource, which can be widely applied for multifunctional purposes. Its important advantages such as high-energy value, low ash content, low price and wide abundance, make peach stones an ideal fuel for energy production, but also for new materials synthesis. Although peach stones exhibit adequate combustion properties, allowing their direct use with minimal physical/chemical treatment, they often need further modification in order to improve their thermal properties, where slow pyrolysis is frequently used. This study aims to provide a practical and effective solution to the revalorization of waste biomass originating from the fruit processing industry, through slow pyrolysis in order to convert this waste into carbonaceous material - biochar. The thermo-chemical conversion of raw biomass resulted in a stable material with excellent fuel properties, with higher mass energy density and grinding ability, providing biochar with properties, in energy sense, similar or even better than a coal. Biochar has a higher fixed carbon content and a higher energy potential than biomass itself, and its application as a biofuel might reduce emissions of greenhouse gases, as it reduces the amount of waste landed and increases the share of energy generated from renewable sources.
{"title":"Improvement of energy properties of lignocellulosic waste by thermochemical conversion into biochar","authors":"Zorica R. Lopičić, Ana Antanasković, T. Šoštarić, Vladimir Adamović, M. Orlić, J. Milojković, M. Milivojevic","doi":"10.2298/hemind221222013l","DOIUrl":"https://doi.org/10.2298/hemind221222013l","url":null,"abstract":"Peach stones, a valuable agro-industrial by-product available in many countries worldwide, comprise a renewable resource, which can be widely applied for multifunctional purposes. Its important advantages such as high-energy value, low ash content, low price and wide abundance, make peach stones an ideal fuel for energy production, but also for new materials synthesis. Although peach stones exhibit adequate combustion properties, allowing their direct use with minimal physical/chemical treatment, they often need further modification in order to improve their thermal properties, where slow pyrolysis is frequently used. This study aims to provide a practical and effective solution to the revalorization of waste biomass originating from the fruit processing industry, through slow pyrolysis in order to convert this waste into carbonaceous material - biochar. The thermo-chemical conversion of raw biomass resulted in a stable material with excellent fuel properties, with higher mass energy density and grinding ability, providing biochar with properties, in energy sense, similar or even better than a coal. Biochar has a higher fixed carbon content and a higher energy potential than biomass itself, and its application as a biofuel might reduce emissions of greenhouse gases, as it reduces the amount of waste landed and increases the share of energy generated from renewable sources.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79627749","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}
Pub Date : 2023-01-01DOI: 10.2298/hemind221113009m
Marija Miladinovic, S. Pavlović, Ivana Bankovic-Ilic, Milan Kostic, Olivera S. Stamenković, V. Veljković
Possibilities of using waste plum stones in biodiesel production were investigated. The plum kernels were used as a source to obtain oil by the Soxhlet extraction method, while the whole plum stones, the plum stone shells that remained after the crashing, and the plum kernel cake that remained after the oil extraction, were burned off to obtain ashes. The collected ashes were characterized by elemental composition, porosity, and base strength and tested for catalytic activity in transesterification of esterified plum kernel oil. Dominant elements were potassium, calcium, and magnesium at different contents in the three obtained ashes. The most active catalyst was the plum stone shell ash, so the effect of temperature (40, 50, and 60?C) on the reaction rate was investigated. The reaction rate constant increased with the reaction temperature with the activation energy value of 58.8 kJ mol-1. In addition, the plum stone shell ash can be reused as a catalyst after recalcination.
{"title":"Utilization of waste plum stones as a source of oil and catalyst for biodiesel production","authors":"Marija Miladinovic, S. Pavlović, Ivana Bankovic-Ilic, Milan Kostic, Olivera S. Stamenković, V. Veljković","doi":"10.2298/hemind221113009m","DOIUrl":"https://doi.org/10.2298/hemind221113009m","url":null,"abstract":"Possibilities of using waste plum stones in biodiesel production were investigated. The plum kernels were used as a source to obtain oil by the Soxhlet extraction method, while the whole plum stones, the plum stone shells that remained after the crashing, and the plum kernel cake that remained after the oil extraction, were burned off to obtain ashes. The collected ashes were characterized by elemental composition, porosity, and base strength and tested for catalytic activity in transesterification of esterified plum kernel oil. Dominant elements were potassium, calcium, and magnesium at different contents in the three obtained ashes. The most active catalyst was the plum stone shell ash, so the effect of temperature (40, 50, and 60?C) on the reaction rate was investigated. The reaction rate constant increased with the reaction temperature with the activation energy value of 58.8 kJ mol-1. In addition, the plum stone shell ash can be reused as a catalyst after recalcination.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89835110","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}
Pub Date : 2023-01-01DOI: 10.2298/hemind220808003d
N. Djurisic-Mladenovic, M. Tomic, B. Pajin, Maja Buljovčić, I. Lončarević, Milica Rankov-Sicar
This work examines pressurized accelerated oxidation by a RapidOxy tester as an alternative method for determination of biodiesel oxidation stability. Sunflower oil-based biodiesel was synthesized and treated with antioxidants: tert-butylhydroquinone (TBHQ) - a synthetic antioxidant known for its powerful protective effect, and a mixture of bio-based antioxidant compounds extracted from vinery waste, VWEeth. The antioxidant potency of TBHQ was evaluated at varying temperatures (110 - 140 ?C) and concentrations (250 - 2,000 mg dm-3) by the RapidOxy method; assessment of selected results was performed by comparison with relevant data obtained by the standard Rancimat method. VWEeth was added in two high dosages to biodiesel (87,500 and 150,000 mg dm-3) and analyzed at 140 ?C by the RapidOxy method. Both antioxidants at all applied dosages showed beneficial effects on improving the oxidative stability of biodiesel, but not all of the achieved improvements reached the stability minimum identified by the EN14214 standard. The lowest addition of TBHQ seemed to have a similar effect as the tested dosages of VWEeth but these additions did not increase the induction period above the limit of 8 h; two-fold higher quantity of TBHQ was successful in this respect, increasing the initial oxidation stability by a factor of about 2, which was determined by both methods. The RapidOxy method proved to be a very fast method suitable for testing a large number of samples, which is particularly important for efficient testing of different types and doses of antioxidants.
{"title":"Stability evaluation of biodiesel supplemented with synthetic and bio-based antioxidants by a pressurized accelerated oxidation method","authors":"N. Djurisic-Mladenovic, M. Tomic, B. Pajin, Maja Buljovčić, I. Lončarević, Milica Rankov-Sicar","doi":"10.2298/hemind220808003d","DOIUrl":"https://doi.org/10.2298/hemind220808003d","url":null,"abstract":"This work examines pressurized accelerated oxidation by a RapidOxy tester as an alternative method for determination of biodiesel oxidation stability. Sunflower oil-based biodiesel was synthesized and treated with antioxidants: tert-butylhydroquinone (TBHQ) - a synthetic antioxidant known for its powerful protective effect, and a mixture of bio-based antioxidant compounds extracted from vinery waste, VWEeth. The antioxidant potency of TBHQ was evaluated at varying temperatures (110 - 140 ?C) and concentrations (250 - 2,000 mg dm-3) by the RapidOxy method; assessment of selected results was performed by comparison with relevant data obtained by the standard Rancimat method. VWEeth was added in two high dosages to biodiesel (87,500 and 150,000 mg dm-3) and analyzed at 140 ?C by the RapidOxy method. Both antioxidants at all applied dosages showed beneficial effects on improving the oxidative stability of biodiesel, but not all of the achieved improvements reached the stability minimum identified by the EN14214 standard. The lowest addition of TBHQ seemed to have a similar effect as the tested dosages of VWEeth but these additions did not increase the induction period above the limit of 8 h; two-fold higher quantity of TBHQ was successful in this respect, increasing the initial oxidation stability by a factor of about 2, which was determined by both methods. The RapidOxy method proved to be a very fast method suitable for testing a large number of samples, which is particularly important for efficient testing of different types and doses of antioxidants.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88080865","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}
Pub Date : 2023-01-01DOI: 10.2298/hemind230120014b
Dario Balaban, Branislava Nikolovski, M. Perusic, G. Tadic
This paper presents research on hydrodynamics and mass transfer in a packed absorption column. Experimental data on dry column pressure drop, flooding point, and efficiency of absorption of CO2 in water is obtained on a lab-scale absorption column packed with Raschig rings. Auxiliary parts of equipment together with chemical analyses provide simple monitoring and collecting the data. All obtained data were used to test different mathematical models for a given problem, i.e. for determination of the dry column pressure drop, flooding point and the overall gas transfer unit height. For dry column pressure drop, models developed primarily for packed columns described the data the best, with the Billet model generating a 6.54 % mean error, followed by Mackowiak and Stichlmair models. In flooding point calculations, empirical models were tested and models of Lobo, Leva and Takahshi gave the best results. Mass transfer (absorption) experiments gave expected results, since absorption efficiency increased with the increase in the liquid/gas flow rate ratio, i.e. with approaching the flooding point. The Onda?s model was used to calculate partial mass transfer coefficients in liquid and gas phases based on which the height of the overall gas transfer unit was estimated and subsequently compared with the experimental data. Deviation of calculated and experimental results for the height of the overall gas transfer unit is in the expected range of 0-20 %, with mean value of 15.5 %. In conclusion, the available models for determination of the investigated hydrodynamics and mass transfer parameters in packed absorption columns gave adequate results in comparison to the experimental values.
{"title":"Experimental and modeling studies of mass transfer and hydrodynamics in a packed bed absorption column for CO2 - water system","authors":"Dario Balaban, Branislava Nikolovski, M. Perusic, G. Tadic","doi":"10.2298/hemind230120014b","DOIUrl":"https://doi.org/10.2298/hemind230120014b","url":null,"abstract":"This paper presents research on hydrodynamics and mass transfer in a packed absorption column. Experimental data on dry column pressure drop, flooding point, and efficiency of absorption of CO2 in water is obtained on a lab-scale absorption column packed with Raschig rings. Auxiliary parts of equipment together with chemical analyses provide simple monitoring and collecting the data. All obtained data were used to test different mathematical models for a given problem, i.e. for determination of the dry column pressure drop, flooding point and the overall gas transfer unit height. For dry column pressure drop, models developed primarily for packed columns described the data the best, with the Billet model generating a 6.54 % mean error, followed by Mackowiak and Stichlmair models. In flooding point calculations, empirical models were tested and models of Lobo, Leva and Takahshi gave the best results. Mass transfer (absorption) experiments gave expected results, since absorption efficiency increased with the increase in the liquid/gas flow rate ratio, i.e. with approaching the flooding point. The Onda?s model was used to calculate partial mass transfer coefficients in liquid and gas phases based on which the height of the overall gas transfer unit was estimated and subsequently compared with the experimental data. Deviation of calculated and experimental results for the height of the overall gas transfer unit is in the expected range of 0-20 %, with mean value of 15.5 %. In conclusion, the available models for determination of the investigated hydrodynamics and mass transfer parameters in packed absorption columns gave adequate results in comparison to the experimental values.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76539956","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}
Pub Date : 2023-01-01DOI: 10.2298/hemind221213020c
Natalija Čutović, Petar Batinic, Tatjana Marković, D. Radanović, A. Marinković, B. Bugarski, A. Jovanović
The presented study aimed to optimize polyphenol extraction from Satureja montana L. obtained from the experimental field of the Institute for Medicinal Plants Research ?Dr Josif Pancic?, Serbia, by varying the most important parameters for maceration, solid-to-solvent ratio, and extraction time. The obtained extracts were characterized regarding the total polyphenol content (TPC), total flavonoid content (TFC), antioxidant potential, extraction yield, conductivity, density, surface tension, and viscosity. The TPC and TFC were ~7 to 92 mg GAE (gallic acid equivalent)/g and 3.7 to 10.9 mg CE (catechin equivalent)/g, respectively. The highest extraction yield (86 %) as well as the highest antioxidant activities were obtained for the extracts prepared using a solid-to-solvent ratio of 1 g :50 cm3. On the other hand, the extraction time did not have a significant influence. The highest conductivity was measured in the extract prepared at a 1 g :10 cm3 ratio, while the highest density and surface tension were in the extract prepared at a 1 g :40 cm3 ratio (941 kg m-3 and 29.0 mN m-1, respectively). The highest viscosity was measured in the extract prepared at a 1 g : 20 cm3 ratio (2.89 mPa?s). Our study shows the possibilities for the production of polyphenol-rich extract of S. montana which might be used in pharmaceutical, food, or cosmetic products.
{"title":"Optimization of the extraction process from Satureja montana L.: Physicochemical characterization of the extracts","authors":"Natalija Čutović, Petar Batinic, Tatjana Marković, D. Radanović, A. Marinković, B. Bugarski, A. Jovanović","doi":"10.2298/hemind221213020c","DOIUrl":"https://doi.org/10.2298/hemind221213020c","url":null,"abstract":"The presented study aimed to optimize polyphenol extraction from Satureja montana L. obtained from the experimental field of the Institute for Medicinal Plants Research ?Dr Josif Pancic?, Serbia, by varying the most important parameters for maceration, solid-to-solvent ratio, and extraction time. The obtained extracts were characterized regarding the total polyphenol content (TPC), total flavonoid content (TFC), antioxidant potential, extraction yield, conductivity, density, surface tension, and viscosity. The TPC and TFC were ~7 to 92 mg GAE (gallic acid equivalent)/g and 3.7 to 10.9 mg CE (catechin equivalent)/g, respectively. The highest extraction yield (86 %) as well as the highest antioxidant activities were obtained for the extracts prepared using a solid-to-solvent ratio of 1 g :50 cm3. On the other hand, the extraction time did not have a significant influence. The highest conductivity was measured in the extract prepared at a 1 g :10 cm3 ratio, while the highest density and surface tension were in the extract prepared at a 1 g :40 cm3 ratio (941 kg m-3 and 29.0 mN m-1, respectively). The highest viscosity was measured in the extract prepared at a 1 g : 20 cm3 ratio (2.89 mPa?s). Our study shows the possibilities for the production of polyphenol-rich extract of S. montana which might be used in pharmaceutical, food, or cosmetic products.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85612408","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}
Pub Date : 2023-01-01DOI: 10.2298/hemind220502011k
G. Katona, D. Korcok, Nada Trsic-Milanovic, Natasa Jovanovic-Ljeskovic
Probiotic products are becoming more common in everyday use around the world, while at the same time, the interest of scientists in researching probiotic production and use is increasing. Stability of a probiotic product in pharmaceutical production is affected by the choice of probiotic strain, formulation, and packaging. Packaging is the final stage of production and presents a crucial factor for the stability of probiotic products to maintain declared probiotic viability during the products' shelf life. The present research describes the influence of additional packaging material on the encapsulated probiotic product, which contains Lactiplantibacillus plantarum 299v. In specific, the effect of additional blister protection within flow pack bags was investigated. Blisters were made of a chloride/poly-vinylidene chloride/polyethylene-triplex foil (PVC/PVdC/PE foil) and aluminum foil. Viability of probiotic lactobacilli cells protected in blisters only was compared to those packed in flow pack bags filled with nitrogen as an inert gas. Better protection of probiotic cells from oxygen, light, and moisture was determined in the capsules in the latter case. In specific, introduction of additional blister protection in flow pack bags resulted in ~11 % higher probiotic viability when compared to the other blister samples without such protection after 24 months, and therefore it enabled more efficient storage of the product during use.
{"title":"Improving the stability of a probiotic product with Lactiplantibacillus plantarum 299v by introducing flow pack bags","authors":"G. Katona, D. Korcok, Nada Trsic-Milanovic, Natasa Jovanovic-Ljeskovic","doi":"10.2298/hemind220502011k","DOIUrl":"https://doi.org/10.2298/hemind220502011k","url":null,"abstract":"Probiotic products are becoming more common in everyday use around the world, while at the same time, the interest of scientists in researching probiotic production and use is increasing. Stability of a probiotic product in pharmaceutical production is affected by the choice of probiotic strain, formulation, and packaging. Packaging is the final stage of production and presents a crucial factor for the stability of probiotic products to maintain declared probiotic viability during the products' shelf life. The present research describes the influence of additional packaging material on the encapsulated probiotic product, which contains Lactiplantibacillus plantarum 299v. In specific, the effect of additional blister protection within flow pack bags was investigated. Blisters were made of a chloride/poly-vinylidene chloride/polyethylene-triplex foil (PVC/PVdC/PE foil) and aluminum foil. Viability of probiotic lactobacilli cells protected in blisters only was compared to those packed in flow pack bags filled with nitrogen as an inert gas. Better protection of probiotic cells from oxygen, light, and moisture was determined in the capsules in the latter case. In specific, introduction of additional blister protection in flow pack bags resulted in ~11 % higher probiotic viability when compared to the other blister samples without such protection after 24 months, and therefore it enabled more efficient storage of the product during use.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"121 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78433125","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}
Pub Date : 2023-01-01DOI: 10.2298/hemind222610001s
Radmila Serovic, Ivana Jelic, B. Matić, A. Savić
Utilization possibilities of solidified fractions of industrial hazardous waste obtained by mixing with inert materials in construction were investigated. Waste mineral oils, water-hydrocarbon emulsions mixture, and waste filter cakes from the physico-chemical treatment of wastewater generated by washing of patterned rollers for a printing machine, were used as models of industrial hazardous waste in the solidification process. Investigation comprised preparation of concrete and asphalt mixtures for further testing. The solidified powder was analyzed regarding the granulometric composition, while the obtained concrete samples were further subjected to compressive strength determination, whereas the asphalt mixtures were tested in the context of potential waterproofing materials. According to the obtained leaching test results, all the samples met the required conditions for further application. Compressive strength test results were in the range of 8.7 - 22.6 MPa. Still, the measured compressive strength values were lower than expected, which is explained using solidified powder fractions of smaller grain size. According to the results, it can be concluded that the investigated mixtures cannot be used for structural building elements, but their usage is recommended for elements such as pavements, roadside, path cubes, concrete haberdashery, etc. Asphalt mixtures showed acceptable properties in terms of mechanical, durability, and waterproofing tests.
{"title":"Utilization of solidified industrial hazardous waste in construction: A case study","authors":"Radmila Serovic, Ivana Jelic, B. Matić, A. Savić","doi":"10.2298/hemind222610001s","DOIUrl":"https://doi.org/10.2298/hemind222610001s","url":null,"abstract":"Utilization possibilities of solidified fractions of industrial hazardous waste obtained by mixing with inert materials in construction were investigated. Waste mineral oils, water-hydrocarbon emulsions mixture, and waste filter cakes from the physico-chemical treatment of wastewater generated by washing of patterned rollers for a printing machine, were used as models of industrial hazardous waste in the solidification process. Investigation comprised preparation of concrete and asphalt mixtures for further testing. The solidified powder was analyzed regarding the granulometric composition, while the obtained concrete samples were further subjected to compressive strength determination, whereas the asphalt mixtures were tested in the context of potential waterproofing materials. According to the obtained leaching test results, all the samples met the required conditions for further application. Compressive strength test results were in the range of 8.7 - 22.6 MPa. Still, the measured compressive strength values were lower than expected, which is explained using solidified powder fractions of smaller grain size. According to the results, it can be concluded that the investigated mixtures cannot be used for structural building elements, but their usage is recommended for elements such as pavements, roadside, path cubes, concrete haberdashery, etc. Asphalt mixtures showed acceptable properties in terms of mechanical, durability, and waterproofing tests.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84315763","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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