Pub Date : 2014-02-05DOI: 10.5755/J01.CT.64.2.6019
K. Bolibrukh, N. Monka, Svyatoslav Polovkovych, V. Lubenets, V. Novikov, O. Khoumeri, T. Terme, P. Vanelle, O. Solovyov
The optimisation of reaction conditions for obtaining thiosulfonate derivatives was performed. S,N-binucleophiles (sodium salts of 4-amino- and 4-acetylaminobenzenethiosulfonic acids) were used. The parameters of the reaction for the synthesis of derivatives by a thiosulfonate fragment were determined. Thiosulfonate derivatives based on a number of quinones and quinoxalines were synthesized. DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6019
对合成硫代磺酸盐衍生物的反应条件进行了优化。采用S, n -双亲核试剂(4-氨基和4-乙酰氨基苯乙磺酸钠盐)。确定了硫代磺酸盐片段合成衍生物的反应参数。合成了以若干醌类和喹诺啉类为基础的硫代磺酸盐衍生物。DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6019
{"title":"Synthesis of new thiosulfonate derivatives with quinone and quinoxaline fragments","authors":"K. Bolibrukh, N. Monka, Svyatoslav Polovkovych, V. Lubenets, V. Novikov, O. Khoumeri, T. Terme, P. Vanelle, O. Solovyov","doi":"10.5755/J01.CT.64.2.6019","DOIUrl":"https://doi.org/10.5755/J01.CT.64.2.6019","url":null,"abstract":"The optimisation of reaction conditions for obtaining thiosulfonate derivatives was performed. S,N-binucleophiles (sodium salts of 4-amino- and 4-acetylaminobenzenethiosulfonic acids) were used. The parameters of the reaction for the synthesis of derivatives by a thiosulfonate fragment were determined. Thiosulfonate derivatives based on a number of quinones and quinoxalines were synthesized. DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6019","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"29 1","pages":"14-20"},"PeriodicalIF":0.0,"publicationDate":"2014-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87480505","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 : 2014-02-05DOI: 10.5755/J01.CT.64.2.6021
A. Ramanauskas, I. Jonuškienė
Plants produce a wide variety of secondary metabolites that have been selected during evolution as defense substances against herbivores, predators or infective microbes and viruses, or as signal compounds. These secondary compounds have attracted great interest for drug development as they may represent lead structures for new or already existing drug targets. The goals of the research: 1) to explore metabolites (total phenolic compounds, flavonoids, vitamin C) and the antioxidant activity of medicinal plants in vivo ; 2) to select medicinal plants which have accumulated the highest content of secondary metabolites; 3) to prepare the culture media with different pH values for the sage in vitro ; 4) to prepare the culture media with different KH 2 PO 4 quantities for the sage ( Salvia officinalis L.) in vitro ; 5) to explore secondary metabolites (total phenolic compounds, vitamin C, tannins) of the sage in vitro ; 6) to compare the content of metabolites of sage plants in vivo and in vitro ; In conclusion, in order to grow sage ( Salvia officinalis L.) which would give a large biomass and produce large quantities of metabolites, it is useful to increase the amount of KH 2 PO 4 two times in the Murashige–Skoog (MS) nutrient medium and to maintain pH within 5.7–6.7. Sage ( Salvia officinalis L.) was found to accumulate the larger amount of metabolites in vitro , i.e. 1.7 times of tannins, 3.8 times of the vitamin C, and 3 times of flavonoids in comparison with the sage in vivo. DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6021
{"title":"EVALUATION OF SECONDARY METABOLITES’ VARIATION IN MEDICINAL PLANTS AND OPTIMIZATION OF SAGE (SALVIA OFFICINALIS L.) GROWTH IN VITRO","authors":"A. Ramanauskas, I. Jonuškienė","doi":"10.5755/J01.CT.64.2.6021","DOIUrl":"https://doi.org/10.5755/J01.CT.64.2.6021","url":null,"abstract":"Plants produce a wide variety of secondary metabolites that have been selected during evolution as defense substances against herbivores, predators or infective microbes and viruses, or as signal compounds. These secondary compounds have attracted great interest for drug development as they may represent lead structures for new or already existing drug targets. The goals of the research: 1) to explore metabolites (total phenolic compounds, flavonoids, vitamin C) and the antioxidant activity of medicinal plants in vivo ; 2) to select medicinal plants which have accumulated the highest content of secondary metabolites; 3) to prepare the culture media with different pH values for the sage in vitro ; 4) to prepare the culture media with different KH 2 PO 4 quantities for the sage ( Salvia officinalis L.) in vitro ; 5) to explore secondary metabolites (total phenolic compounds, vitamin C, tannins) of the sage in vitro ; 6) to compare the content of metabolites of sage plants in vivo and in vitro ; In conclusion, in order to grow sage ( Salvia officinalis L.) which would give a large biomass and produce large quantities of metabolites, it is useful to increase the amount of KH 2 PO 4 two times in the Murashige–Skoog (MS) nutrient medium and to maintain pH within 5.7–6.7. Sage ( Salvia officinalis L.) was found to accumulate the larger amount of metabolites in vitro , i.e. 1.7 times of tannins, 3.8 times of the vitamin C, and 3 times of flavonoids in comparison with the sage in vivo. DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6021","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"44 1","pages":"28-34"},"PeriodicalIF":0.0,"publicationDate":"2014-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74952535","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 : 2014-02-01DOI: 10.5755/J01.CT.64.2.6099
R. Šlinkšienė, O. Brigaityte
In this work, different sources of potassium materials were used for 10-20-20 + S + Mg fertilizer granulation. It was found that both the raw material KCl and magnesium from carnallite production by-products (KE) can be used for fertilizer making. With both potassium raw materials, upon selecting certain granulation process parameters, it is possible to make a high-quality product. To produce a high quality 10-20-20 + S + Mg NPK fertilizer which would be a marketable fraction, using KE requires less moisture than granulation using KCl. If the water content with KCl is 10.1 %, with a sufficient KE it is 8.8 %. However, the drying of fertilizers requires higher energy costs, as maintaining the same drying temperature and the same drying time, the fertilizer produced with KE, the remaining moisture content is 1–3 %, and this is a too high moisture for a fertilizer. The marketable fraction produced using KE is less dependent on raw material mixture granulometric composition than with KCl. The origin potassium raw materials has no significant influence on the static strength of granules. DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6099
采用不同来源的钾肥原料进行10-20-20 + S + Mg肥造粒试验。光卤石生产副产物(KE)中的原料氯化钾和镁均可用于制肥。这两种钾原料，只要选择一定的制粒工艺参数，就有可能制得高质量的产品。为了生产出高质量的10-20-20 + S + Mg氮磷钾肥料，使用KE比使用KCl造粒需要更少的水分。如果含KCl的水含量为10.1%，则足够的KE含量为8.8%。然而，肥料的干燥需要较高的能量成本，因为保持相同的干燥温度和相同的干燥时间，用KE生产的肥料，剩余水分含量为1 - 3%，这对于肥料来说是太高的水分。与KCl相比，使用KE生产的可销售馏分对原料混合物粒度组成的依赖性较小。钾原料的产地对颗粒的静强度无显著影响。DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6099
{"title":"INFLUENCE OF POTASSIUM RAW MATERIALS ON THE BULK FERTILIZER MAKING PROCESS AND ON THE PRODUCT PROPERTIES","authors":"R. Šlinkšienė, O. Brigaityte","doi":"10.5755/J01.CT.64.2.6099","DOIUrl":"https://doi.org/10.5755/J01.CT.64.2.6099","url":null,"abstract":"In this work, different sources of potassium materials were used for 10-20-20 + S + Mg fertilizer granulation. It was found that both the raw material KCl and magnesium from carnallite production by-products (KE) can be used for fertilizer making. With both potassium raw materials, upon selecting certain granulation process parameters, it is possible to make a high-quality product. To produce a high quality 10-20-20 + S + Mg NPK fertilizer which would be a marketable fraction, using KE requires less moisture than granulation using KCl. If the water content with KCl is 10.1 %, with a sufficient KE it is 8.8 %. However, the drying of fertilizers requires higher energy costs, as maintaining the same drying temperature and the same drying time, the fertilizer produced with KE, the remaining moisture content is 1–3 %, and this is a too high moisture for a fertilizer. The marketable fraction produced using KE is less dependent on raw material mixture granulometric composition than with KCl. The origin potassium raw materials has no significant influence on the static strength of granules. DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6099","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"62 1","pages":"63-71"},"PeriodicalIF":0.0,"publicationDate":"2014-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74409461","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 : 2014-02-01DOI: 10.5755/J01.CT.64.2.6100
T. Dambrauskas, K. Baltakys
Compound formation peculiarities in the Ca(OH) 2 –SiO 2 ∙nH 2 O–H 2 O system with the molar ratio of CaO/SiO 2 equal to 1.5 have been examined. The hydrothermal synthesis of the compounds has been carried out in unmixed suspensions at a temperature of 175 °C. The duration of isothermal curing was 4, 8, 16, 24, 48, and 72 hours. In unstirred Ca(OH) 2 and SiO 2 ∙nH 2 O suspensions with CaO/SiO 2 = 1.5, within 4 hours of isothermal curing at 175 °C, dicalcium silicate hydrates – a-C 2 S hydrate, C-S-H(II) and a low base semi-crystalline C-S-H(I) type calcium silicate hydrate – were formed. Within 48 h of hydrothermal synthesis, Ca(OH) 2 was fully reacted, and semi-crystalline C-S-H(II) became metastable and recrystallized into stable compounds – a-C 2 S hydrate and C-S-H(I). The typical destruction temperatures of a-C 2 S hydrate and Ca(OH) 2 were possible to determine by using differential thermogravimetric analysis data: the destruction of Ca(OH) 2 intensively proceeded at a temperature of ~456 oC when a sample lost 1.85 % of its mass. Meanwhile, a-C 2 S hydrate destruction occurred at a higher temperature (~478 oC), and weight loss was equal to 0.58 %. After 72 h of synthesis, a-C 2 S hydrate prevailed in the products. DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6100
{"title":"COMPOUND FORMATION AT 175 °C IN CALCIUM HYDROXIDE AND SILICA DIOXIDE SUSPENSION","authors":"T. Dambrauskas, K. Baltakys","doi":"10.5755/J01.CT.64.2.6100","DOIUrl":"https://doi.org/10.5755/J01.CT.64.2.6100","url":null,"abstract":"Compound formation peculiarities in the Ca(OH) 2 –SiO 2 ∙nH 2 O–H 2 O system with the molar ratio of CaO/SiO 2 equal to 1.5 have been examined. The hydrothermal synthesis of the compounds has been carried out in unmixed suspensions at a temperature of 175 °C. The duration of isothermal curing was 4, 8, 16, 24, 48, and 72 hours. In unstirred Ca(OH) 2 and SiO 2 ∙nH 2 O suspensions with CaO/SiO 2 = 1.5, within 4 hours of isothermal curing at 175 °C, dicalcium silicate hydrates – a-C 2 S hydrate, C-S-H(II) and a low base semi-crystalline C-S-H(I) type calcium silicate hydrate – were formed. Within 48 h of hydrothermal synthesis, Ca(OH) 2 was fully reacted, and semi-crystalline C-S-H(II) became metastable and recrystallized into stable compounds – a-C 2 S hydrate and C-S-H(I). The typical destruction temperatures of a-C 2 S hydrate and Ca(OH) 2 were possible to determine by using differential thermogravimetric analysis data: the destruction of Ca(OH) 2 intensively proceeded at a temperature of ~456 oC when a sample lost 1.85 % of its mass. Meanwhile, a-C 2 S hydrate destruction occurred at a higher temperature (~478 oC), and weight loss was equal to 0.58 %. After 72 h of synthesis, a-C 2 S hydrate prevailed in the products. DOI: http://dx.doi.org/10.5755/j01.ct.64.2.6100","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"11 1","pages":"45-50"},"PeriodicalIF":0.0,"publicationDate":"2014-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84943592","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 : 2013-07-01DOI: 10.5755/J01.CT.62.4.3228
R. Mardosaitė, E. Valatka
The aim of this work was to study glycerol photoelectrochemical oxidation by using electrophoretically deposited nanosized TiO 2 coatings on AISI 304 type stainless steel. The structure and morphology of the prepared coatings were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It has been determined that the coatings contain 73 % of anatase and 27 % of rutile. The average crystallite size was calculated to be 21 and 54 nm for anatase and rutile, respectively. The photoelectrochemical behaviour of TiO 2 coatings was investigated by photovoltammetry. The n-type TiO 2 coatings were found to generate the photocurrents which are greatly enhanced by the presence of glycerol in 0.1 M Na 2 SO 4 aqueous electrolyte. An increase in glycerol concentration causes a decrease in the photocurrent. The presence of pure glycerol results in higher photocurrents as compared with the technical glycerol. DOI: http://dx.doi.org/10.5755/j01.ct.62.4.3228
本文研究了用电泳沉积纳米二氧化钛涂层在AISI 304型不锈钢表面进行甘油的光电氧化。采用x射线衍射仪(XRD)和扫描电镜(SEM)研究了所制备涂层的结构和形貌。测定涂层中锐钛矿含量为73%，金红石含量为27%。计算得出锐钛矿和金红石的平均晶粒尺寸分别为21 nm和54 nm。用光伏法研究了tio2涂层的光电化学行为。在0.1 M na2so4水溶液中加入甘油后，n型二氧化钛涂层产生的光电流大大增强。甘油浓度的增加引起光电流的减少。与技术甘油相比，纯甘油的存在会产生更高的光电流。DOI: http://dx.doi.org/10.5755/j01.ct.62.4.3228
{"title":"Regularities of photoelectrochemical oxidation of glycerol using electrophoretically deposited TiO2 coatings on steel","authors":"R. Mardosaitė, E. Valatka","doi":"10.5755/J01.CT.62.4.3228","DOIUrl":"https://doi.org/10.5755/J01.CT.62.4.3228","url":null,"abstract":"The aim of this work was to study glycerol photoelectrochemical oxidation by using electrophoretically deposited nanosized TiO 2 coatings on AISI 304 type stainless steel. The structure and morphology of the prepared coatings were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It has been determined that the coatings contain 73 % of anatase and 27 % of rutile. The average crystallite size was calculated to be 21 and 54 nm for anatase and rutile, respectively. The photoelectrochemical behaviour of TiO 2 coatings was investigated by photovoltammetry. The n-type TiO 2 coatings were found to generate the photocurrents which are greatly enhanced by the presence of glycerol in 0.1 M Na 2 SO 4 aqueous electrolyte. An increase in glycerol concentration causes a decrease in the photocurrent. The presence of pure glycerol results in higher photocurrents as compared with the technical glycerol. DOI: http://dx.doi.org/10.5755/j01.ct.62.4.3228","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"18 1","pages":"5-9"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88129399","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 : 2013-07-01DOI: 10.5755/J01.CT.62.4.3227
R. Šlinkšienė, R. Paleckienė, A. Sviklas
Pastaraisiais metais ES (po kempinligės protrūkio 2008 m.) apribojus gyvūninės kilmės liekanų perdirbimą ir naudojimą gyvūnų mitybos poreikiams tenkinti, daugiau dėmesio skiriama galimybėms pasarinius priedus gaminti is mineralinės kilmės žaliavų. Siuo tikslu placiai naudojami įvairūs gamtiniai fosfatai, kuriuose yra gyvuliams reikalingų kalcio ir fosforo, taciau dažnai pasitaiko ir žalingų bei griežtai reglamentuojamų priemaisų: kadmio, svino ar fluoro. Alternatyvi žaliava fosforitams galėtų būti cukraus pramonės atlieka – defekatas, kurio didžiąją dalį sudaro kalcio karbonatas. Siame darbe tirtos galimybės defekatą panaudoti pasariniams fosfatams (precipitatui) gaminti apdorojant jį fosforo rūgstimi. Nustatyta, kad, keiciant defekato ir rūgsties santykį, 40 °C temperatūroje defekatą 15 min skaidant 30–40 % koncentracijos H 3 PO 4 , galima gauti įvairios sudėties kalcio fosfatų misinius. Atsižvelgiant į pasirinktas skaidymo sąlygas, pasariniuose fosfatuose keiciasi vandenyje tirpaus kalcio hidrofosfato ir citrate tirpaus kalcio dihidrofosfato kiekiai. Be to, defekate nėra žalingų sunkiųjų metalų priemaisų, todėl si žaliava gali būti naudojama gyvulių pasarų priedams gaminti. DOI: http://dx.doi.org/10.5755/j01.ct.62.4.3227
{"title":"Sugar factory lime usage for the production of feed phosphates","authors":"R. Šlinkšienė, R. Paleckienė, A. Sviklas","doi":"10.5755/J01.CT.62.4.3227","DOIUrl":"https://doi.org/10.5755/J01.CT.62.4.3227","url":null,"abstract":"Pastaraisiais metais ES (po kempinligės protrūkio 2008 m.) apribojus gyvūninės kilmės liekanų perdirbimą ir naudojimą gyvūnų mitybos poreikiams tenkinti, daugiau dėmesio skiriama galimybėms pasarinius priedus gaminti is mineralinės kilmės žaliavų. Siuo tikslu placiai naudojami įvairūs gamtiniai fosfatai, kuriuose yra gyvuliams reikalingų kalcio ir fosforo, taciau dažnai pasitaiko ir žalingų bei griežtai reglamentuojamų priemaisų: kadmio, svino ar fluoro. Alternatyvi žaliava fosforitams galėtų būti cukraus pramonės atlieka – defekatas, kurio didžiąją dalį sudaro kalcio karbonatas. Siame darbe tirtos galimybės defekatą panaudoti pasariniams fosfatams (precipitatui) gaminti apdorojant jį fosforo rūgstimi. Nustatyta, kad, keiciant defekato ir rūgsties santykį, 40 °C temperatūroje defekatą 15 min skaidant 30–40 % koncentracijos H 3 PO 4 , galima gauti įvairios sudėties kalcio fosfatų misinius. Atsižvelgiant į pasirinktas skaidymo sąlygas, pasariniuose fosfatuose keiciasi vandenyje tirpaus kalcio hidrofosfato ir citrate tirpaus kalcio dihidrofosfato kiekiai. Be to, defekate nėra žalingų sunkiųjų metalų priemaisų, todėl si žaliava gali būti naudojama gyvulių pasarų priedams gaminti. DOI: http://dx.doi.org/10.5755/j01.ct.62.4.3227","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"5 1","pages":"16-21"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90401277","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 : 2013-07-01DOI: 10.5755/J01.CT.62.4.3229
J. Galkin, A. Galkina, J. Liesienė, E. Mazoniene
The subject of the study was corn, wheat and potato starch before and after treatment with sodium hydroxide solution, with the aim to evaluate whether this solution is able to remove lipids and have any effect on the rheological properties of starch pastes and gels. Applying the DSC method, it was noted that after the treatment with the sodium hydroxide solution, the enthalpy difference of the amylose – lipids complex formation/ disruption was lower for wheat and corn starch (32.7 % and 71.9 %, respectively). In case of potato starch, complexes were detected neither before nor after the treatment. The study of the rheological properties showed that after the treatment of wheat and corn starch, their gels became softer, the storage modulus (G ′ ) decreased and the delta angle (δ) increased . At the same time, the potato starch gel had a relatively low G ′ modulus and a high delta angle even without treatment, and the treatment itself had a minor effect on its properties. DOI: http://dx.doi.org/10.5755/j01.ct.62.4.3229
{"title":"The influence of sodium hydroxide on the rheological properties of pastes and gels of potato, corn and wheat starches","authors":"J. Galkin, A. Galkina, J. Liesienė, E. Mazoniene","doi":"10.5755/J01.CT.62.4.3229","DOIUrl":"https://doi.org/10.5755/J01.CT.62.4.3229","url":null,"abstract":"The subject of the study was corn, wheat and potato starch before and after treatment with sodium hydroxide solution, with the aim to evaluate whether this solution is able to remove lipids and have any effect on the rheological properties of starch pastes and gels. Applying the DSC method, it was noted that after the treatment with the sodium hydroxide solution, the enthalpy difference of the amylose – lipids complex formation/ disruption was lower for wheat and corn starch (32.7 % and 71.9 %, respectively). In case of potato starch, complexes were detected neither before nor after the treatment. The study of the rheological properties showed that after the treatment of wheat and corn starch, their gels became softer, the storage modulus (G ′ ) decreased and the delta angle (δ) increased . At the same time, the potato starch gel had a relatively low G ′ modulus and a high delta angle even without treatment, and the treatment itself had a minor effect on its properties. DOI: http://dx.doi.org/10.5755/j01.ct.62.4.3229","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"47 1","pages":"22-28"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87116161","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 : 2013-06-13DOI: 10.5755/J01.CT.63.1.4607
Nerijus Turskis
{"title":"Akademiko Jono Janickio chemijos konkursas moksleiviams","authors":"Nerijus Turskis","doi":"10.5755/J01.CT.63.1.4607","DOIUrl":"https://doi.org/10.5755/J01.CT.63.1.4607","url":null,"abstract":"","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"39 1","pages":"59"},"PeriodicalIF":0.0,"publicationDate":"2013-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90875529","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 : 2013-03-08DOI: 10.5755/J01.CT.62.4.3119
I. Augšpole, T. Rakčejeva, L. Dukaļska
Carrots are one of the most consumed plant foods in the world in all seasons; they are good sources of natural antioxidants and contain many different antioxidant components. Carrots are recommended for healthy diets as recognized sources of dietary fiber and antioxidant substances, such as phenols. The current research focuses on the evaluation total phenolic and antiradical activity changes in hybrids of Nantes carrots during storage. Late-bearing variety Nantes hybrid carrots were used for experiments such as Nantes/Berlikum, Nantes/Maestro, Nantes/Forto, Nantes/Bolero and Nantes/Champion. Changes of the quality parameters were evaluated after two and four months of storage in the comparison with non-stored carrots. Standard methods were used to evaluate the quality parameters: total phenols were analysed by the Folin – Ciocalteu colorimetric method with some modifications, and the antiradical activity was measured by the DPPH radical method. The present experiments revealed significant differences ( p < 0.05) in the content of total phenols and antiradical activity changes during carrot storage. The results of the research demonstrate that the content of total phenols decreases within four months of storage approximately 1.3 times as compared with the initial content before storage. However, changes of antiradical activity in carrots after two months of storage were not significant. The a ntiradical activity of carrots decreased significantly (1.8 times on average) after four months of storage. DOI: http://dx.doi.org/10.5755/j01.ct.62.4.3119
{"title":"Changes of phenolic content and antiradical activity in hybrids of Nante carrots during storage","authors":"I. Augšpole, T. Rakčejeva, L. Dukaļska","doi":"10.5755/J01.CT.62.4.3119","DOIUrl":"https://doi.org/10.5755/J01.CT.62.4.3119","url":null,"abstract":"Carrots are one of the most consumed plant foods in the world in all seasons; they are good sources of natural antioxidants and contain many different antioxidant components. Carrots are recommended for healthy diets as recognized sources of dietary fiber and antioxidant substances, such as phenols. The current research focuses on the evaluation total phenolic and antiradical activity changes in hybrids of Nantes carrots during storage. Late-bearing variety Nantes hybrid carrots were used for experiments such as Nantes/Berlikum, Nantes/Maestro, Nantes/Forto, Nantes/Bolero and Nantes/Champion. Changes of the quality parameters were evaluated after two and four months of storage in the comparison with non-stored carrots. Standard methods were used to evaluate the quality parameters: total phenols were analysed by the Folin – Ciocalteu colorimetric method with some modifications, and the antiradical activity was measured by the DPPH radical method. The present experiments revealed significant differences ( p < 0.05) in the content of total phenols and antiradical activity changes during carrot storage. The results of the research demonstrate that the content of total phenols decreases within four months of storage approximately 1.3 times as compared with the initial content before storage. However, changes of antiradical activity in carrots after two months of storage were not significant. The a ntiradical activity of carrots decreased significantly (1.8 times on average) after four months of storage. DOI: http://dx.doi.org/10.5755/j01.ct.62.4.3119","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"54 1","pages":"36-39"},"PeriodicalIF":0.0,"publicationDate":"2013-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79700947","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：