Pub Date : 2017-06-20DOI: 10.2298/HEMIND170322010J
M. Janačković, M. Gvozdenović, B. Grgur
{"title":"Polypyrrole|zinc supercapattery with the aqueous electrolyte","authors":"M. Janačković, M. Gvozdenović, B. Grgur","doi":"10.2298/HEMIND170322010J","DOIUrl":"https://doi.org/10.2298/HEMIND170322010J","url":null,"abstract":"","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42778061","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}
Pub Date : 2017-05-13DOI: 10.2298/HEMIND160210023J
V. Jovanović, D. Knežević, Ž. Sekulić, M. Kragović, J. Stojanovic, Slavica Mihajlović, D. Nišić, D. Radulovic, Branislav Ivošević, M. Petrov
This paper presents the results of tests carried out to determine how the dosage of bentonite added as binder, affects the properties of green pellets made of the limestone fines that originate from Lithothamnium limestone processing. Bentonite was added to limestone in different mass fractions (1, 2.5, 5 and 10%), whereas all the other parameters of the pelletizing process remained constant. The aim of pelletizing was to consolidate limestone fines and form mechanically stable pellets, provided that all the other properties of limestone remain unchanged. The pellets formed in this way were analysed applying DTA/TG analysis and FTIR and SEM analyses. The results showed uniform distribution of bentonite in the pellets, demonstrated that the pellets are compact and there is no formation of new compounds. The pellets were tested for resistance to impact, compressive strength and abrasion resistance. Also disintegration tests were performed to determine the time required for the pellet to disintegrate completely in water. These mechanical properties are essential for transport, handling, storage and general use of pellets. The values of most of the parameters established for pellets with 5% bentonite, meet the standards required for use in agriculture for liming acid soils, however their application is limited because their impact resistance is unsatisfactory and the time required for their complete disintegration in water is extremely short. It should be noted that further increase of bentonite content (over 10%) will not improve the quality of green pellets. In view of the results obtained, it is necessary to introduce drying into the pelletizing process in order to bring the green pellets into solid state.
{"title":"Effects of bentonite binder dosage on the properties of green limestone pellets","authors":"V. Jovanović, D. Knežević, Ž. Sekulić, M. Kragović, J. Stojanovic, Slavica Mihajlović, D. Nišić, D. Radulovic, Branislav Ivošević, M. Petrov","doi":"10.2298/HEMIND160210023J","DOIUrl":"https://doi.org/10.2298/HEMIND160210023J","url":null,"abstract":"This paper presents the results of tests carried out to determine how the dosage of bentonite added as binder, affects the properties of green pellets made of the limestone fines that originate from Lithothamnium limestone processing. Bentonite was added to limestone in different mass fractions (1, 2.5, 5 and 10%), whereas all the other parameters of the pelletizing process remained constant. The aim of pelletizing was to consolidate limestone fines and form mechanically stable pellets, provided that all the other properties of limestone remain unchanged. The pellets formed in this way were analysed applying DTA/TG analysis and FTIR and SEM analyses. The results showed uniform distribution of bentonite in the pellets, demonstrated that the pellets are compact and there is no formation of new compounds. The pellets were tested for resistance to impact, compressive strength and abrasion resistance. Also disintegration tests were performed to determine the time required for the pellet to disintegrate completely in water. These mechanical properties are essential for transport, handling, storage and general use of pellets. The values of most of the parameters established for pellets with 5% bentonite, meet the standards required for use in agriculture for liming acid soils, however their application is limited because their impact resistance is unsatisfactory and the time required for their complete disintegration in water is extremely short. It should be noted that further increase of bentonite content (over 10%) will not improve the quality of green pellets. In view of the results obtained, it is necessary to introduce drying into the pelletizing process in order to bring the green pellets into solid state.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49410530","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}
Pub Date : 2017-05-13DOI: 10.2298/HEMIND160401025R
Z. Rončević, Bojana Bajić, Damjan Vučurović, S. Dodić, J. Grahovac, J. Dodić
Wine industry generates large volumes of wastewaters resulting from numerous cleaning operations that occur during the different stages of winemaking. Disposal of these effluents in the environment causes huge problems due to their high organic and inorganic load and seasonal variability. The bioconversion of winery wastewaters in valuable product, such as xanthan, is an important alternative to overcome environmental problems. In this research, the possibility of xanthan production using Xanthomonas campestris on blended wastewaters from different stages of white and rose wine production with initial sugar content of 50 g/L was investigated. In addition to the media parameters (content of sugars, total and assimilable nitrogen, phosphorus, total dissolved salts and apparent viscosity), raw xanthan yield and degree of sugar conversion into product were determined in order to examine the success of xanthan biosynthesis. In applied experimental conditions, xanthan yield of 20.92 and 30.64 g/L and sugar conversion into product of 40.23 and 60.73% were achieved on wastewaters from white and rose wine production, respectively. The results of these experiments suggest that winery wastewaters, after additional optimization of the process in terms of the substrate composition and the cultivation conditions, may be a suitable raw material for industrial xanthan production.
{"title":"Xanthan production on wastewaters from wine industry","authors":"Z. Rončević, Bojana Bajić, Damjan Vučurović, S. Dodić, J. Grahovac, J. Dodić","doi":"10.2298/HEMIND160401025R","DOIUrl":"https://doi.org/10.2298/HEMIND160401025R","url":null,"abstract":"Wine industry generates large volumes of wastewaters resulting from numerous cleaning operations that occur during the different stages of winemaking. Disposal of these effluents in the environment causes huge problems due to their high organic and inorganic load and seasonal variability. The bioconversion of winery wastewaters in valuable product, such as xanthan, is an important alternative to overcome environmental problems. In this research, the possibility of xanthan production using Xanthomonas campestris on blended wastewaters from different stages of white and rose wine production with initial sugar content of 50 g/L was investigated. In addition to the media parameters (content of sugars, total and assimilable nitrogen, phosphorus, total dissolved salts and apparent viscosity), raw xanthan yield and degree of sugar conversion into product were determined in order to examine the success of xanthan biosynthesis. In applied experimental conditions, xanthan yield of 20.92 and 30.64 g/L and sugar conversion into product of 40.23 and 60.73% were achieved on wastewaters from white and rose wine production, respectively. The results of these experiments suggest that winery wastewaters, after additional optimization of the process in terms of the substrate composition and the cultivation conditions, may be a suitable raw material for industrial xanthan production.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43652896","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}
Pub Date : 2017-05-13DOI: 10.2298/HEMIND150629024P
Jelena Panak Balentić, Đ. Ačkar, A. Jozinović, J. Babić, Borislav Miličević, S. Jokić, B. Pajin, D. Šubarić
Extrusion process is one of the most important innovations of the 20th century applied in many industries. Extrusion is a technology that is increasingly used for the production of various food products, especially snacks and breakfast cereals. Supercritical carbon dioxide (CO2) as a non-toxic, non-flammable and inexpensive, is applied in many processes, including the extrusion technology. Supercritical CO2 extrusion process (SCFX) found its application primarily in the processing and manufacturing plastic, but recently more and more begins to be applied in food production and processing. Scientific researches in this area are based in production of extrudates with improved properties compared to conventional extrusion process without the addition of CO2. A number of applications of SCFX in food processing technology will be reviewed and numerous advantages over the conventional process will be described in this paper.
{"title":"Application of supercritical carbon dioxide extrusion in food processing technology","authors":"Jelena Panak Balentić, Đ. Ačkar, A. Jozinović, J. Babić, Borislav Miličević, S. Jokić, B. Pajin, D. Šubarić","doi":"10.2298/HEMIND150629024P","DOIUrl":"https://doi.org/10.2298/HEMIND150629024P","url":null,"abstract":"Extrusion process is one of the most important innovations of the 20th century applied in many industries. Extrusion is a technology that is increasingly used for the production of various food products, especially snacks and breakfast cereals. Supercritical carbon dioxide (CO2) as a non-toxic, non-flammable and inexpensive, is applied in many processes, including the extrusion technology. Supercritical CO2 extrusion process (SCFX) found its application primarily in the processing and manufacturing plastic, but recently more and more begins to be applied in food production and processing. Scientific researches in this area are based in production of extrudates with improved properties compared to conventional extrusion process without the addition of CO2. A number of applications of SCFX in food processing technology will be reviewed and numerous advantages over the conventional process will be described in this paper.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68379481","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}
Pub Date : 2017-05-13DOI: 10.2298/HEMIND150525021S
P. Stanojevic, B. Barac, B. Pešić, V. B. Vucelic-Radovic
Soybean is considered an important source of human food and animal feed. Okara and tofu whey are the main by-products of soymilk and tofu production. The distribution of enzymes b -amylase and lipoxygenase (Lox) from six soybean genotypes in protein extracts of okara and tofu as well as in soymilk and tofu whey was assessed. SDS-electrophoretic results showed that production process significantly affected high molecular mass protein fractions of soybean by-products. Low amounts of Lox in soymilk were registered, while in okara protein extracts and tofu whey this enzyme was present in trace. In tofu protein extracts, Lox was registered in higher quantity that might be the result of the aggregation process during formation of the tofu gel. Content of b -amylase in all soy protein products was high and similar to the content in soybean genotype. Content of b -amylase in okara depended on respective soybean genotype.
{"title":"Distribution of β-amylase and lipoxygenase in soy protein products obtained during tofu production","authors":"P. Stanojevic, B. Barac, B. Pešić, V. B. Vucelic-Radovic","doi":"10.2298/HEMIND150525021S","DOIUrl":"https://doi.org/10.2298/HEMIND150525021S","url":null,"abstract":"Soybean is considered an important source of human food and animal feed. Okara and tofu whey are the main by-products of soymilk and tofu production. The distribution of enzymes b -amylase and lipoxygenase (Lox) from six soybean genotypes in protein extracts of okara and tofu as well as in soymilk and tofu whey was assessed. SDS-electrophoretic results showed that production process significantly affected high molecular mass protein fractions of soybean by-products. Low amounts of Lox in soymilk were registered, while in okara protein extracts and tofu whey this enzyme was present in trace. In tofu protein extracts, Lox was registered in higher quantity that might be the result of the aggregation process during formation of the tofu gel. Content of b -amylase in all soy protein products was high and similar to the content in soybean genotype. Content of b -amylase in okara depended on respective soybean genotype.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43404116","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}
Pub Date : 2017-05-13DOI: 10.2298/HEMIND140821080R
S. Rančić, S. Nikolić-Mandić, A. Bojić, Snežana M. Đorić-Veljković, A. Zarubica, P. Janković
A new, simple, rapid, sensitive and selective kinetic spectrophotometric method for Pd(II) traces determination was elaborated in this paper. It is based on the catalytic effect of palladium ions upon the oxidation of methylene blue B (MBB) by (NH 4 ) 2 S 2 O 8 (APS) in citric buffer (BUF) solution. At the working temperature of 25 °C and the wavelength of 662.4 nm, the optimal conditions for palladium determination were found. RSD value was found to be 2.6 to 4.9% for the investigated concentration range of Pd(II). Limit of detection ( LD ) was found to be 2.0 ng cm –3 Pd(II), and limit of quantification ( LQ ) is 6.9 ng cm –3 Pd(II). Only the presence of Pb 2+ , Hg 2+ and Sn 2+ in the reaction mixture interferes the determination of palladium by this method, while Au 3+ and Ag + have the catalytic effect upon the reaction rate. By this method, it is possible to determine the Pd(II) traces in the concentration range of 3.3´10 –8 to 1.0´10 –6 g cm –3 . The method was confirmed by determination of Pd(II) traces in alloy PtRhG as well as in the powder of Pt. The obtained results were compared to those obtained by ICP-OES method and good agreement of results was found.
本文介绍了一种新的、简便、快速、灵敏、选择性强的动力学光度法测定痕量钯。它是基于钯离子在柠檬酸缓冲液（BUF）中对（NH4）2S2O8（APS）氧化亚甲蓝B（MBB）的催化作用。在25°C的工作温度和662.4nm的波长下，找到了钯的最佳测定条件。对于所研究的Pd（II）浓度范围，发现RSD值为2.6至4.9%。检测限（LD）为2.0 ng cm–3 Pd（II），定量限（LQ）为6.9 ng cm–3。反应混合物中只有Pb2+、Hg2+和Sn2+的存在会干扰该方法对钯的测定，而Au3+和Ag+对反应速率有催化作用。通过这种方法，可以测定浓度范围为3.3´10–8至1.0´10-6 g cm–3的Pd（II）痕量。通过测定PtRhG合金和Pt粉末中的Pd（II）痕量，证实了该方法。将获得的结果与ICP-OES方法获得的结果进行了比较，结果一致性良好。
{"title":"Application of the reaction system methylene blue B–(NH4)2S2O8 for the kinetic spectrophotometric determination of palladium in citric buffer media","authors":"S. Rančić, S. Nikolić-Mandić, A. Bojić, Snežana M. Đorić-Veljković, A. Zarubica, P. Janković","doi":"10.2298/HEMIND140821080R","DOIUrl":"https://doi.org/10.2298/HEMIND140821080R","url":null,"abstract":"A new, simple, rapid, sensitive and selective kinetic spectrophotometric method for Pd(II) traces determination was elaborated in this paper. It is based on the catalytic effect of palladium ions upon the oxidation of methylene blue B (MBB) by (NH 4 ) 2 S 2 O 8 (APS) in citric buffer (BUF) solution. At the working temperature of 25 °C and the wavelength of 662.4 nm, the optimal conditions for palladium determination were found. RSD value was found to be 2.6 to 4.9% for the investigated concentration range of Pd(II). Limit of detection ( LD ) was found to be 2.0 ng cm –3 Pd(II), and limit of quantification ( LQ ) is 6.9 ng cm –3 Pd(II). Only the presence of Pb 2+ , Hg 2+ and Sn 2+ in the reaction mixture interferes the determination of palladium by this method, while Au 3+ and Ag + have the catalytic effect upon the reaction rate. By this method, it is possible to determine the Pd(II) traces in the concentration range of 3.3´10 –8 to 1.0´10 –6 g cm –3 . The method was confirmed by determination of Pd(II) traces in alloy PtRhG as well as in the powder of Pt. The obtained results were compared to those obtained by ICP-OES method and good agreement of results was found.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46248973","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}
Pub Date : 2017-05-13DOI: 10.2298/HEMIND160327027K
M. Kim, Hyun-Wook Hwang, A. Nzioka, Young-Ju Kim
In order to secure more effective lipid extraction method, this research investigated new lipid extraction method using laser with absorbent and sought its optimum operation control. In addition, this study compared lipid extraction efficiency and FAME conversion rate between laser extraction method at optimum condition and existing extraction method. Results from experiments for optimizing lipid extraction method using laser showed that the maximum extraction efficiency (81.8%) was attained when using laser with an output capacity of 75Wh/L. Extraction efficiency increased up to 90.8% when microwave treatment as pretreatment process was conducted. Addition of absorbents during lipid extraction process with laser showed higher extraction efficiency than laser and chemical method. It was also found that laser extraction method with absorbent had higher total fatty acid content (853.7 mg/g oil) in extracted lipid than chemical extraction method (825.4 mg/g oil). Furthermore, it had the highest FAME conversion rate (94.2%).
{"title":"Enhanced lipid extraction from microalgae in biodiesel production","authors":"M. Kim, Hyun-Wook Hwang, A. Nzioka, Young-Ju Kim","doi":"10.2298/HEMIND160327027K","DOIUrl":"https://doi.org/10.2298/HEMIND160327027K","url":null,"abstract":"In order to secure more effective lipid extraction method, this research investigated new lipid extraction method using laser with absorbent and sought its optimum operation control. In addition, this study compared lipid extraction efficiency and FAME conversion rate between laser extraction method at optimum condition and existing extraction method. Results from experiments for optimizing lipid extraction method using laser showed that the maximum extraction efficiency (81.8%) was attained when using laser with an output capacity of 75Wh/L. Extraction efficiency increased up to 90.8% when microwave treatment as pretreatment process was conducted. Addition of absorbents during lipid extraction process with laser showed higher extraction efficiency than laser and chemical method. It was also found that laser extraction method with absorbent had higher total fatty acid content (853.7 mg/g oil) in extracted lipid than chemical extraction method (825.4 mg/g oil). Furthermore, it had the highest FAME conversion rate (94.2%).","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48674780","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}
Pub Date : 2017-05-13DOI: 10.2298/HEMIND160419026D
A. Došić, D. Pilipović, Miladin J. Gligorić, B. Dalmacija, Đ. Kerkez, N. Slijepčević, Jelena M. Spasojević, Zoran B. Obrenović
Increasing amounts of residues and waste materials coming from industrial activities in different processes have become an increasingly urgent problem for the future. The paper presents the problem of mine tailings generated in mine “Sase” (Republic of Srpska, Bosnia and Herzegovina) with high metal content (Pb, Cu and Zn). Dumpsite of this tailing represents potential risk for water bodies in the vicinity of this location. Chosen treatment process was stabilization/solidification (S/S). Inorganic agents used in this study were fly ash and red mud that represent secondary industrial waste generated on locations relatively near the mine. Therefore, their application can be used as an example of a sustainable solution of regional environmental problem. Further investigations are related to the impact of various factors on metals leaching from mine tailings solidified/stabilized material using the above mentioned immobilization agents. The performance of the immobilizing procedures was examined using several leaching tests: ANS 16.1, TCLP, DIN, MWLP. The results indicated that all S/S samples can be considered as non-hazardous waste, as all leached metal concentrations met the set criteria. These results will further enable the modelling of metals behaviour during long-term leaching from treated mine tailing. The data are invaluable in terms of economically and environmentally sound management of mine tailing.
{"title":"Green remediation of tailings from the mine using inorganic agents","authors":"A. Došić, D. Pilipović, Miladin J. Gligorić, B. Dalmacija, Đ. Kerkez, N. Slijepčević, Jelena M. Spasojević, Zoran B. Obrenović","doi":"10.2298/HEMIND160419026D","DOIUrl":"https://doi.org/10.2298/HEMIND160419026D","url":null,"abstract":"Increasing amounts of residues and waste materials coming from industrial activities in different processes have become an increasingly urgent problem for the future. The paper presents the problem of mine tailings generated in mine “Sase” (Republic of Srpska, Bosnia and Herzegovina) with high metal content (Pb, Cu and Zn). Dumpsite of this tailing represents potential risk for water bodies in the vicinity of this location. Chosen treatment process was stabilization/solidification (S/S). Inorganic agents used in this study were fly ash and red mud that represent secondary industrial waste generated on locations relatively near the mine. Therefore, their application can be used as an example of a sustainable solution of regional environmental problem. Further investigations are related to the impact of various factors on metals leaching from mine tailings solidified/stabilized material using the above mentioned immobilization agents. The performance of the immobilizing procedures was examined using several leaching tests: ANS 16.1, TCLP, DIN, MWLP. The results indicated that all S/S samples can be considered as non-hazardous waste, as all leached metal concentrations met the set criteria. These results will further enable the modelling of metals behaviour during long-term leaching from treated mine tailing. The data are invaluable in terms of economically and environmentally sound management of mine tailing.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44797508","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}
Pub Date : 2017-05-13DOI: 10.2298/HEMIND140313068R
Mirjana Radovanovic, Branimir Z. Račić, S. Tanasković, Goran Marković, Dalibor D. Tomić, J. Pantović
Dopunska ishrana pcela invertnim sirupom predstavlja najpopularniji nacin prihrane. Pcelari cesto pripremaju invertni sirup dodatkom kiseline rastvoru saharoze na povisenim temperaturama. Međutim, proizvodnja invertnog sirupa u nekontrolisanim uslovima pH, temperature i vremena može uzrokovati nastanak 5-hidroksimetil-2-furaldehida (HMF), stetnog za pcele. Visoko kvalitetan invertni sirup dobija se hidrolitickom razgradnjom saharoze pomocu enzima invertaze. Posto med sadrži enzim invertazu, može se koristiti kao biokatalizator inverzije saharoze. U radu je ispitan sadržaj redukujucih secera nastalih delovanjem bagremovog meda na 50 mas.% rastvora saharoze. Odnos mase redukujucih secera i saharoze na 40 °C, nakon 5 dana hidrolize i pri koncentraciji meda 10 mas.% iznosio je 0,30 g redukujucih secera/g saharoze. Najveci sadržaj redukujucih secera postignut je na temperaturi 35 °C, nakon 48 h invertovanja. U svim uzorcima sirupa hidrolizata dobijenim na razlicitim temperaturama (35–65 °C) detektovan je HMF u koncentracijama manjim od 4,32 mg kg –1 . Ustanovljen je visok stepen negativne korelacije (koeficijent linearnosti –0,94) između parametara volumetrijskog i polarimetrijskog pracenja reakcije hidrolize.
{"title":"The catalytic effect of honey on formation of reducing sugars during sucrose hydrolysis","authors":"Mirjana Radovanovic, Branimir Z. Račić, S. Tanasković, Goran Marković, Dalibor D. Tomić, J. Pantović","doi":"10.2298/HEMIND140313068R","DOIUrl":"https://doi.org/10.2298/HEMIND140313068R","url":null,"abstract":"Dopunska ishrana pcela invertnim sirupom predstavlja najpopularniji nacin prihrane. Pcelari cesto pripremaju invertni sirup dodatkom kiseline rastvoru saharoze na povisenim temperaturama. Međutim, proizvodnja invertnog sirupa u nekontrolisanim uslovima pH, temperature i vremena može uzrokovati nastanak 5-hidroksimetil-2-furaldehida (HMF), stetnog za pcele. Visoko kvalitetan invertni sirup dobija se hidrolitickom razgradnjom saharoze pomocu enzima invertaze. Posto med sadrži enzim invertazu, može se koristiti kao biokatalizator inverzije saharoze. U radu je ispitan sadržaj redukujucih secera nastalih delovanjem bagremovog meda na 50 mas.% rastvora saharoze. Odnos mase redukujucih secera i saharoze na 40 °C, nakon 5 dana hidrolize i pri koncentraciji meda 10 mas.% iznosio je 0,30 g redukujucih secera/g saharoze. Najveci sadržaj redukujucih secera postignut je na temperaturi 35 °C, nakon 48 h invertovanja. U svim uzorcima sirupa hidrolizata dobijenim na razlicitim temperaturama (35–65 °C) detektovan je HMF u koncentracijama manjim od 4,32 mg kg –1 . Ustanovljen je visok stepen negativne korelacije (koeficijent linearnosti –0,94) između parametara volumetrijskog i polarimetrijskog pracenja reakcije hidrolize.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41369391","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}
Pub Date : 2017-05-13DOI: 10.2298/HEMIND140604071S
J. R. Sevic, R. Lukáč, S. V. Vidivic, M. Puvača, M. Savic, B. Ljubojević, M. Tomović, R. N. Dzinic
The aim of this study was to provide a comparative analysis of chemical and fatty acid composition, as well as of the connective tissue proteins in pigs of different genotypes, Mangalitsa and Landrace. Both pig genotypes were fed with the same feed of standard composition and quality. At the end of the fattening period, in total 24 pigs of both genotypes were slaughtered. Based on the analysis of the chemical composition we came to the conclusion that the protein content in both genotypes was similar. Moisture and ash content in the Landrace pig genotype differed significantly (P<0.01) compared with genotype of pigs Mangalitsa breed. Statistically significant differences (P<0.01) were established in the fat content, which was 7.95 g/100g, in pigs of Mangalitsa breed and 1.59 g/100g in the Landrace pigs breed. Content of hydroxyproline, non-proteinogenic amino acids, in meat of Landrace was significantly higher (P<0.01) compared to the content in the Mangalitsa breed. The same tendency was observed with regard to the connective tissue protein content as well as with the relative connective tissue protein content. The fatty acid composition of the meat indicated that the most common saturated fatty acid (SFA) in both tested breeds was palmitic fatty acid (C16), whose content was significantly higher in Landrace (P<0.01) compared with its content in Mangalitsa breed. In addition, the share of stearic acid (C18) was significantly higher (P<0.01) in Landrace compared to Mangalitsa pig breed, what significantly contributed to the increase of the SFA share in Landrace compared to Mangalitsa breed. The most common monounsaturated fatty acid in both pig breeds was the oleic fatty acid (C18:1), whose share was significantly higher in Mangalitsa compared to the Landrace breed (P<0.01). Out of the polyunsaturated fatty acids (PUFA), linoleic fatty acid (C18:2) was the most predominant in both pig breeds, with no statistically significant differences (P>0.05). The content of PUFA was not statistically significantly different between the tested breeds, as well as the content of n-3 and n-6 fatty acids, which caused no statistically significant differences in the n-6/n-3 PUFA ratio. Ratio of the unsaturated fatty acids, i.e., of the sum of MUFA and PUFA, and of the saturated fatty acids was significantly higher in Mangalitsa compared to Landrace breed (1.86 versus 1.4), and the same was observed when it comes to the relationship MUFA/SFA (1.51 in Mangalitsa versus 1.08 in Landrace breed) and MUFA/PUFA (4.35 versus 3.38).
{"title":"Some parameters of nutritional quality of meat obtained from Mangalitsa and Landrace pig breeds","authors":"J. R. Sevic, R. Lukáč, S. V. Vidivic, M. Puvača, M. Savic, B. Ljubojević, M. Tomović, R. N. Dzinic","doi":"10.2298/HEMIND140604071S","DOIUrl":"https://doi.org/10.2298/HEMIND140604071S","url":null,"abstract":"The aim of this study was to provide a comparative analysis of chemical and \u0000 fatty acid composition, as well as of the connective tissue proteins in pigs \u0000 of different genotypes, Mangalitsa and Landrace. Both pig genotypes were fed \u0000 with the same feed of standard composition and quality. At the end of the \u0000 fattening period, in total 24 pigs of both genotypes were slaughtered. Based \u0000 on the analysis of the chemical composition we came to the conclusion that \u0000 the protein content in both genotypes was similar. Moisture and ash content \u0000 in the Landrace pig genotype differed significantly (P<0.01) compared with \u0000 genotype of pigs Mangalitsa breed. Statistically significant differences \u0000 (P<0.01) were established in the fat content, which was 7.95 g/100g, in pigs \u0000 of Mangalitsa breed and 1.59 g/100g in the Landrace pigs breed. Content of \u0000 hydroxyproline, non-proteinogenic amino acids, in meat of Landrace was \u0000 significantly higher (P<0.01) compared to the content in the Mangalitsa \u0000 breed. The same tendency was observed with regard to the connective tissue \u0000 protein content as well as with the relative connective tissue protein \u0000 content. The fatty acid composition of the meat indicated that the most \u0000 common saturated fatty acid (SFA) in both tested breeds was palmitic fatty \u0000 acid (C16), whose content was significantly higher in Landrace (P<0.01) \u0000 compared with its content in Mangalitsa breed. In addition, the share of \u0000 stearic acid (C18) was significantly higher (P<0.01) in Landrace compared to \u0000 Mangalitsa pig breed, what significantly contributed to the increase of the \u0000 SFA share in Landrace compared to Mangalitsa breed. The most common \u0000 monounsaturated fatty acid in both pig breeds was the oleic fatty acid \u0000 (C18:1), whose share was significantly higher in Mangalitsa compared to the \u0000 Landrace breed (P<0.01). Out of the polyunsaturated fatty acids (PUFA), \u0000 linoleic fatty acid (C18:2) was the most predominant in both pig breeds, with \u0000 no statistically significant differences (P>0.05). The content of PUFA was \u0000 not statistically significantly different between the tested breeds, as well \u0000 as the content of n-3 and n-6 fatty acids, which caused no statistically \u0000 significant differences in the n-6/n-3 PUFA ratio. Ratio of the unsaturated \u0000 fatty acids, i.e., of the sum of MUFA and PUFA, and of the saturated fatty \u0000 acids was significantly higher in Mangalitsa compared to Landrace breed (1.86 \u0000 versus 1.4), and the same was observed when it comes to the relationship \u0000 MUFA/SFA (1.51 in Mangalitsa versus 1.08 in Landrace breed) and MUFA/PUFA \u0000 (4.35 versus 3.38).","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68374673","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}
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