首页 > 最新文献

Acta Chimica Slovaca最新文献

英文 中文
Effect of ambient parameters change on mint leaves solar drying 环境参数变化对薄荷叶日光干燥的影响
IF 0.8 Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0003
A. Noori, Mohammad Jafar Royen, J. Haydary
Abstract This study investigates the effect of ambient conditions change on mint leaves solar drying performance and product water activity. Two drying methods, active indirect solar drying (AISD) and open sun drying (OSD) were compared while the experiments were carried out at specific dry climate conditions. During the experimental days, temperature varied from 20 to 30 °C, air relative humidity from 14 to 28.8 % and ambient pressure was around 82 kPa. The effect of air relative humidity change during the day on the rehydration of the product during the drying process was observed. After 7 h of drying, moisture content of mint leaves decreased from 85.29 % to 5.38 % in the AISD and 7.42 % in the OSD system. The 0.97 initial water activity decreased to 0.195 in AISD and 0.79 in OSD. Rehydration during the evening hours caused an increase in product water activity from 0.2 to 0.51. Changes of ambient conditions such as temperature and air relative humidity during the day can significantly affect water activity of dried product due to its rehydration and thus increase the risk of product spoilage.
摘要本研究探讨了环境条件变化对薄荷叶太阳能干燥性能和产品水分活性的影响。在特定的干燥气候条件下进行实验,比较了活性间接太阳干燥(AISD)和开放太阳干燥(OSD)两种干燥方法。在实验期间,温度在20至30°C之间变化,空气相对湿度在14至28.8%之间变化,环境压力约为82 kPa。观察了白天空气相对湿度变化对干燥过程中产品再水合的影响。干燥7小时后,在AISD和OSD系统中,薄荷叶的含水量分别从85.29%和7.42%下降。AISD中0.97的初始水活度降至0.195,OSD中降至0.79。晚上的补水使产品水的活性从0.2增加到0.51。白天环境条件(如温度和空气相对湿度)的变化会显著影响干燥产品的水分活度,因为它会重新水合,从而增加产品变质的风险。
{"title":"Effect of ambient parameters change on mint leaves solar drying","authors":"A. Noori, Mohammad Jafar Royen, J. Haydary","doi":"10.2478/acs-2021-0003","DOIUrl":"https://doi.org/10.2478/acs-2021-0003","url":null,"abstract":"Abstract This study investigates the effect of ambient conditions change on mint leaves solar drying performance and product water activity. Two drying methods, active indirect solar drying (AISD) and open sun drying (OSD) were compared while the experiments were carried out at specific dry climate conditions. During the experimental days, temperature varied from 20 to 30 °C, air relative humidity from 14 to 28.8 % and ambient pressure was around 82 kPa. The effect of air relative humidity change during the day on the rehydration of the product during the drying process was observed. After 7 h of drying, moisture content of mint leaves decreased from 85.29 % to 5.38 % in the AISD and 7.42 % in the OSD system. The 0.97 initial water activity decreased to 0.195 in AISD and 0.79 in OSD. Rehydration during the evening hours caused an increase in product water activity from 0.2 to 0.51. Changes of ambient conditions such as temperature and air relative humidity during the day can significantly affect water activity of dried product due to its rehydration and thus increase the risk of product spoilage.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49619935","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}
引用次数: 4
Identification of corrosion products on iron artefact from Bratislava castle 布拉迪斯拉发城堡铁制品腐蚀产物的鉴定
IF 0.8 Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0001
R. Košťúr, M. Zemanová
Abstract Corrosion layers of an iron artefact were characterized to study long-term exposition of iron in Slovakia. The iron artefact from Bratislava castle has been coated with a strong layer of corrosion products and masonry residues. Corrosion products were characterized by different methods including energy-dispersive X-ray spectroscopy (EDX), X-Ray diffraction (XRD), and µ-Raman Spectroscopy. Magnetite and goethite on the surface are confirmed typical corrosion products from long-term atmospheric exposure in environment with corrosivity category C-2 (low).
摘要对斯洛伐克铁制品的腐蚀层进行了表征,以研究铁的长期暴露。来自布拉迪斯拉发城堡的铁制人工制品已经被一层坚固的腐蚀产物和砖石残留物所覆盖。腐蚀产物通过能量色散x射线光谱(EDX)、x射线衍射(XRD)和微拉曼光谱(µ-Raman)等不同的方法进行了表征。表面的磁铁矿和针铁矿是长期暴露在大气环境中的典型腐蚀产物,腐蚀性等级为C-2(低)。
{"title":"Identification of corrosion products on iron artefact from Bratislava castle","authors":"R. Košťúr, M. Zemanová","doi":"10.2478/acs-2021-0001","DOIUrl":"https://doi.org/10.2478/acs-2021-0001","url":null,"abstract":"Abstract Corrosion layers of an iron artefact were characterized to study long-term exposition of iron in Slovakia. The iron artefact from Bratislava castle has been coated with a strong layer of corrosion products and masonry residues. Corrosion products were characterized by different methods including energy-dispersive X-ray spectroscopy (EDX), X-Ray diffraction (XRD), and µ-Raman Spectroscopy. Magnetite and goethite on the surface are confirmed typical corrosion products from long-term atmospheric exposure in environment with corrosivity category C-2 (low).","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42446661","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}
引用次数: 1
Stationary phase type and temperature effect on HPLC separation of lactic acid enantiomers 固定相类型和温度对乳酸对映体HPLC分离的影响
IF 0.8 Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0008
Laura Jánovová, K. Hroboňová
Abstract Lactic acid is a biologically important organic acid existing in two enantiomeric forms which are differently metabolized in the human body. In this paper, direct chiral separation of lactic acid by high performance liquid chromatography is presented. Five chiral stationary phases based on macrocyclic antibiotics were used for enantioseparation and chromatographic parameters, such as retention factors, resolution and selectivity factors, were determined under different column temperatures ranging from 5 to 45 °C. Optical isomers of lactic acid were efficiently separated using chiral stationary phases based on teicoplanin (RS = 1.9 ) and ristocetin (RS = 1.7 ) in reversed-phase separation mode at the column temperature of 25 °C.
摘要乳酸是一种重要的生物有机酸,以两种对映体形式存在,在人体内代谢不同。本文采用高效液相色谱法直接分离乳酸。采用五种基于大环抗生素的手性固定相进行对映分离,并在5~45°C的不同柱温下测定了保留因子、分辨率和选择性因子等色谱参数。在25°C的柱温下,使用基于替考拉宁(RS=1.9)和利托西汀(RS=1.7)的手性固定相以反相分离模式有效分离乳酸的光学异构体。
{"title":"Stationary phase type and temperature effect on HPLC separation of lactic acid enantiomers","authors":"Laura Jánovová, K. Hroboňová","doi":"10.2478/acs-2021-0008","DOIUrl":"https://doi.org/10.2478/acs-2021-0008","url":null,"abstract":"Abstract Lactic acid is a biologically important organic acid existing in two enantiomeric forms which are differently metabolized in the human body. In this paper, direct chiral separation of lactic acid by high performance liquid chromatography is presented. Five chiral stationary phases based on macrocyclic antibiotics were used for enantioseparation and chromatographic parameters, such as retention factors, resolution and selectivity factors, were determined under different column temperatures ranging from 5 to 45 °C. Optical isomers of lactic acid were efficiently separated using chiral stationary phases based on teicoplanin (RS = 1.9 ) and ristocetin (RS = 1.7 ) in reversed-phase separation mode at the column temperature of 25 °C.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49493480","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}
引用次数: 0
Influence of sea buckthorn juice addition on the growth of microbial food cultures 添加沙棘汁对微生物食品培养物生长的影响
IF 0.8 Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0004
Svetlana Schubertová, Zuzana Burčová, M. Greifová, Marianna Potočňáková, Lívia Janotková, František Kreps
Abstract The aim of the article was to investigate the effect of sea buckthorn juice addition on the growth of microbial cultures in growth medium and juice mixtures. Pure sea buckthorn juice was found to inhibit the growth of all 11 monitored microbial cultures. Lactobacillus plantarum CCM 7039, Lactobacillus plantarum K816, Lactobacillus brevis CCM 1815 and, to a lesser extent, the probiotic strain Lactobacillus rhamnosus GG, grew in a growth medium containing a 25 % addition of sea buckthorn juice. Lactobacillus plantarum K816 and Lactobacillus brevis CCM 1815 grew better in this mixture than in pure growth medium. Moreover, we focused on finding a suitable ratio of sea buckthorn and apple juice for Lactobacillus plantarum CCM 7039, leading to malolactic fermentation, which results in an increase in the pH value and an improvement in the sensory properties of juices. The intention was to incorporate the highest possible addition of sea buckthorn juice while maintaining the viability of Lactobacillus plantarum CCM 7039 for malolactic fermentation to occur. The best results were achieved using 40 % sea buckthorn juice. Practical application of the results points to the possibility of preparing a fermented fruit beverage and a dairy product containing sea buckthorn juice. The results of this work extend the current options of sea buckthorn juice processing increasing thus the consumption of healthy juice.
摘要本文研究了添加沙棘汁对培养基和混合果汁中微生物培养物生长的影响。发现纯沙棘汁抑制所有11种监测微生物培养物的生长。植物乳杆菌CCM 7039、植物乳杆菌K816、短乳杆菌CCM 1815以及鼠李糖乳杆菌GG在添加25%沙棘汁的培养基中生长。植物乳杆菌K816和短乳杆菌CCM 1815在混合培养基中生长较好。此外,我们重点寻找适合植物乳杆菌CCM 7039的沙棘和苹果汁的比例,进行苹果酸乳酸发酵,从而提高pH值,改善果汁的感官性能。目的是加入尽可能高的沙棘汁,同时保持植物乳杆菌CCM 7039的活力,使苹果酸乳酸发酵发生。沙棘汁用量为40%,效果最佳。结果的实际应用表明,可以制备含沙棘汁的发酵水果饮料和乳制品。这项工作的结果扩大了目前沙棘汁加工的选择,从而增加了健康果汁的消费。
{"title":"Influence of sea buckthorn juice addition on the growth of microbial food cultures","authors":"Svetlana Schubertová, Zuzana Burčová, M. Greifová, Marianna Potočňáková, Lívia Janotková, František Kreps","doi":"10.2478/acs-2021-0004","DOIUrl":"https://doi.org/10.2478/acs-2021-0004","url":null,"abstract":"Abstract The aim of the article was to investigate the effect of sea buckthorn juice addition on the growth of microbial cultures in growth medium and juice mixtures. Pure sea buckthorn juice was found to inhibit the growth of all 11 monitored microbial cultures. Lactobacillus plantarum CCM 7039, Lactobacillus plantarum K816, Lactobacillus brevis CCM 1815 and, to a lesser extent, the probiotic strain Lactobacillus rhamnosus GG, grew in a growth medium containing a 25 % addition of sea buckthorn juice. Lactobacillus plantarum K816 and Lactobacillus brevis CCM 1815 grew better in this mixture than in pure growth medium. Moreover, we focused on finding a suitable ratio of sea buckthorn and apple juice for Lactobacillus plantarum CCM 7039, leading to malolactic fermentation, which results in an increase in the pH value and an improvement in the sensory properties of juices. The intention was to incorporate the highest possible addition of sea buckthorn juice while maintaining the viability of Lactobacillus plantarum CCM 7039 for malolactic fermentation to occur. The best results were achieved using 40 % sea buckthorn juice. Practical application of the results points to the possibility of preparing a fermented fruit beverage and a dairy product containing sea buckthorn juice. The results of this work extend the current options of sea buckthorn juice processing increasing thus the consumption of healthy juice.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46106816","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}
引用次数: 0
Influence of selected antibiotics on respirometric activity of activated sludge 选择的抗生素对活性污泥呼吸活性的影响
IF 0.8 Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0011
Dóra Varjúová, Petra Szabová, I. Bodík
Abstract The main topic of this study is to determine the effect of selected antibiotics on the respirometric activity of sewage sludge microorganisms. Within the practical part of the work, several respirometric measurements were performed with activated sludge from a wastewater treatment plant, while the influence of three selected antibiotics — sulfamethoxazole, sulfapyridine, and ciprofloxacin, on sludge activity was monitored. The aim of the work was to point out the inhibitory effect of all monitored compounds on sludge activity and to quantify the inhibitory effect. For sulfamethoxazole (in the concentration range of 0.142—1.42 mg·L−1), the determined inhibition was in the range of 9.67—27.7 %, depending on the concentration of the test substance and the type of respirometric measurements. For sulfapyridine, inhibition values ranged from 1.13 % to 31.9 % for the concentration range from 0.134 to 1.34 mg·L−1. Ciprofloxacin inhibited the activity of activated sludge microorganisms in the range of 4.55 % to 28.8 % (at CPX concentrations from 0.104 to 1.04 mg·L−1).
摘要本研究的主要课题是确定所选抗生素对污水污泥微生物呼吸学活性的影响。在实际工作中,对废水处理厂的活性污泥进行了几次呼吸测量,同时监测了三种选定的抗生素——磺胺甲恶唑、磺胺吡啶和环丙沙星对污泥活性的影响。这项工作的目的是指出所有监测化合物对污泥活性的抑制作用,并量化抑制作用。对于磺胺甲恶唑(浓度范围为0.142 ~ 1.42 mg·L−1),测定的抑制作用范围为9.67 ~ 27.7%,这取决于测试物质的浓度和呼吸测量的类型。对于磺胺吡啶,在0.134 ~ 1.34 mg·L−1的浓度范围内,抑制率为1.13% ~ 31.9%。环丙沙星对活性污泥微生物的抑制作用范围为4.55% ~ 28.8% (CPX浓度为0.104 ~ 1.04 mg·L−1)。
{"title":"Influence of selected antibiotics on respirometric activity of activated sludge","authors":"Dóra Varjúová, Petra Szabová, I. Bodík","doi":"10.2478/acs-2021-0011","DOIUrl":"https://doi.org/10.2478/acs-2021-0011","url":null,"abstract":"Abstract The main topic of this study is to determine the effect of selected antibiotics on the respirometric activity of sewage sludge microorganisms. Within the practical part of the work, several respirometric measurements were performed with activated sludge from a wastewater treatment plant, while the influence of three selected antibiotics — sulfamethoxazole, sulfapyridine, and ciprofloxacin, on sludge activity was monitored. The aim of the work was to point out the inhibitory effect of all monitored compounds on sludge activity and to quantify the inhibitory effect. For sulfamethoxazole (in the concentration range of 0.142—1.42 mg·L−1), the determined inhibition was in the range of 9.67—27.7 %, depending on the concentration of the test substance and the type of respirometric measurements. For sulfapyridine, inhibition values ranged from 1.13 % to 31.9 % for the concentration range from 0.134 to 1.34 mg·L−1. Ciprofloxacin inhibited the activity of activated sludge microorganisms in the range of 4.55 % to 28.8 % (at CPX concentrations from 0.104 to 1.04 mg·L−1).","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47009610","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}
引用次数: 0
Toluene oxidation: UV irradiation vs. ferrates 甲苯氧化:紫外线照射与高铁酸盐
IF 0.8 Pub Date : 2020-10-01 DOI: 10.2478/acs-2020-0018
L. Fašková, Daniela Pavúková, E. Mališová, L. Štibrányi, J. Híveš
Abstract Novel technologies for organic pollutants degradation have been studied to cope with extensive water pollution. In this work, the use of ultraviolet degradation and potassium ferrate as possible oxidation tools for toluene, a widely used industrial chemical, degradation is proposed. In the experiment with ultraviolet irradiation, a low-pressure mercury lamp was used to generate a single line electromagnetic radiation with the wavelength of 254 nm. Maximal degradation efficiency achieved after 55 minutes of irradiation was 67.1 %. In the experiments with potassium ferrate, the highest degradation efficiency was 71.2 % at the concentration of 10 mg/L of ferrate (VI) anion.
摘要:为应对广泛的水污染,人们研究了有机污染物降解的新技术。本文提出了利用紫外降解和高铁酸钾作为氧化工具降解甲苯这一广泛应用的工业化学品的可能性。在紫外照射实验中,使用低压汞灯产生波长为254 nm的单线电磁辐射。辐照55分钟后,最大降解效率为67.1%。在高铁酸钾的实验中,高铁酸盐(VI)阴离子浓度为10 mg/L时,降解效率最高,为71.2%。
{"title":"Toluene oxidation: UV irradiation vs. ferrates","authors":"L. Fašková, Daniela Pavúková, E. Mališová, L. Štibrányi, J. Híveš","doi":"10.2478/acs-2020-0018","DOIUrl":"https://doi.org/10.2478/acs-2020-0018","url":null,"abstract":"Abstract Novel technologies for organic pollutants degradation have been studied to cope with extensive water pollution. In this work, the use of ultraviolet degradation and potassium ferrate as possible oxidation tools for toluene, a widely used industrial chemical, degradation is proposed. In the experiment with ultraviolet irradiation, a low-pressure mercury lamp was used to generate a single line electromagnetic radiation with the wavelength of 254 nm. Maximal degradation efficiency achieved after 55 minutes of irradiation was 67.1 %. In the experiments with potassium ferrate, the highest degradation efficiency was 71.2 % at the concentration of 10 mg/L of ferrate (VI) anion.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44423568","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}
引用次数: 0
Decrease of cholesterol content in milk by sorption onto β-cyclodextrin crosslinked with tartaric acid; considerations and implications 用酒石酸交联的β-环糊精吸附降低牛奶中的胆固醇含量;考虑因素和影响
IF 0.8 Pub Date : 2020-10-01 DOI: 10.2478/acs-2020-0024
M. Kukula, L. Kolarič, P. Šimko
Abstract Elevated cholesterol intake can induce the development of cardiovascular diseases in man, especially with long term animal origin foods consumption. Therefore, this work deals with the possibility of cholesterol content decrease in milk applying β-cyclodextrin crosslinked with tartaric acid (βCDcTA) as a removal agent. Evaluation of statistic data on food consumption in the Slovak Republic in 2018 aimed at total cholesterol daily intake and effects of “milky” cholesterol content decrease on total cholesterol balance. During the experiments, various amounts of βCDcTA addition to milk were studied resulting in optimal 5 % addition resulting in the cholesterol content decrease by 85.4 % in comparison to original cholesterol content. For monitoring purposes, an HPLC method analysing cholesterol content in saponified milk was employed. The food consumption data analysis showed that total per capita daily cholesterol intake was 369.8 mg, from which 86 mg was assigned to the cholesterol contained in milk and dairy products while the application of cholesterol removal procedure could decrease the total per capita daily cholesterol intake to 296.3 mg (“milky” cholesterol amount equal to 12.6 mg), which in below the recommended value of 300 mg daily intake still valid in the Slovak Republic. This approach might prove as a meaningful step to weaken health problems associated with high long term intake of cholesterol contained in foods of animal origin.
摘要胆固醇摄入增加会导致人类心血管疾病的发展,尤其是长期食用动物源性食物。因此,本工作探讨了用酒石酸交联的β-环糊精(βCDcTA)作为去除剂降低牛奶中胆固醇含量的可能性。评估斯洛伐克共和国2018年食品消费统计数据,旨在了解每日总胆固醇摄入量以及“乳白色”胆固醇含量下降对总胆固醇平衡的影响。在实验过程中,研究了在牛奶中添加不同量的βCDcTA,得出了5%的最佳添加量,与原始胆固醇含量相比,胆固醇含量降低了85.4%。为了监测目的,采用高效液相色谱法分析皂化乳中的胆固醇含量。食物消费数据分析显示,人均每日总胆固醇摄入量为369.8 mg,其中86 mg分配给牛奶和乳制品中所含的胆固醇,而应用胆固醇去除程序可以将人均每日总总胆固醇摄入量降至296.3 mg(“乳白色”胆固醇量等于12.6 mg),在斯洛伐克共和国,低于每天300毫克摄入量的推荐值仍然有效。这种方法可能被证明是一个有意义的步骤,可以减轻与动物源性食物中胆固醇长期摄入过高有关的健康问题。
{"title":"Decrease of cholesterol content in milk by sorption onto β-cyclodextrin crosslinked with tartaric acid; considerations and implications","authors":"M. Kukula, L. Kolarič, P. Šimko","doi":"10.2478/acs-2020-0024","DOIUrl":"https://doi.org/10.2478/acs-2020-0024","url":null,"abstract":"Abstract Elevated cholesterol intake can induce the development of cardiovascular diseases in man, especially with long term animal origin foods consumption. Therefore, this work deals with the possibility of cholesterol content decrease in milk applying β-cyclodextrin crosslinked with tartaric acid (βCDcTA) as a removal agent. Evaluation of statistic data on food consumption in the Slovak Republic in 2018 aimed at total cholesterol daily intake and effects of “milky” cholesterol content decrease on total cholesterol balance. During the experiments, various amounts of βCDcTA addition to milk were studied resulting in optimal 5 % addition resulting in the cholesterol content decrease by 85.4 % in comparison to original cholesterol content. For monitoring purposes, an HPLC method analysing cholesterol content in saponified milk was employed. The food consumption data analysis showed that total per capita daily cholesterol intake was 369.8 mg, from which 86 mg was assigned to the cholesterol contained in milk and dairy products while the application of cholesterol removal procedure could decrease the total per capita daily cholesterol intake to 296.3 mg (“milky” cholesterol amount equal to 12.6 mg), which in below the recommended value of 300 mg daily intake still valid in the Slovak Republic. This approach might prove as a meaningful step to weaken health problems associated with high long term intake of cholesterol contained in foods of animal origin.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42618790","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}
引用次数: 4
Impact of packing density on primary drying rate 填料密度对一次干燥速率的影响
IF 0.8 Pub Date : 2020-10-01 DOI: 10.2478/acs-2020-0021
Anna Matejčíková, P. Rajniak
Abstract This work aimed to determine the effect of packing density on the sublimation rate in a laboratory freeze dryer. Total amount of sublimed water was determined by gravimetric method while a total of seven experiments were performed under the same conditions (pressure, temperature, and drying time), at different configuration of the vials. The experiments confirmed that the higher the packing density, the lower the drying rate, and vice versa, the lower the packing density, the higher the drying rate. The effect of vials packing density was confirmed by experiments using a plastic rack, while the vials were separated and thus the packing density was lower. In this case, the drying rate was more homogeneous, which contributes to the higher quality of the final product.
本文旨在确定实验室冷冻干燥机中填料密度对升华速率的影响。通过重量法测定升华水的总量,同时在相同的条件(压力、温度和干燥时间)下,在不同的小瓶配置下进行总共七个实验。实验证实,填料密度越高,干燥速率越低,反之亦然,填料密度愈低,干燥速率愈高。小瓶包装密度的影响通过使用塑料支架的实验得到了证实,同时小瓶被分离,因此包装密度较低。在这种情况下,干燥速率更均匀,这有助于最终产品的更高质量。
{"title":"Impact of packing density on primary drying rate","authors":"Anna Matejčíková, P. Rajniak","doi":"10.2478/acs-2020-0021","DOIUrl":"https://doi.org/10.2478/acs-2020-0021","url":null,"abstract":"Abstract This work aimed to determine the effect of packing density on the sublimation rate in a laboratory freeze dryer. Total amount of sublimed water was determined by gravimetric method while a total of seven experiments were performed under the same conditions (pressure, temperature, and drying time), at different configuration of the vials. The experiments confirmed that the higher the packing density, the lower the drying rate, and vice versa, the lower the packing density, the higher the drying rate. The effect of vials packing density was confirmed by experiments using a plastic rack, while the vials were separated and thus the packing density was lower. In this case, the drying rate was more homogeneous, which contributes to the higher quality of the final product.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47381888","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}
引用次数: 1
Theoretical modeling of optical spectra of N(1) and N(10) substituted lumichrome derivatives N(1)和N(10)取代的lumichrome衍生物光谱的理论建模
IF 0.8 Pub Date : 2020-10-01 DOI: 10.2478/acs-2020-0017
D. Cagardová, J. Truksa, M. Michalík, Jan Richtár, J. Krajcovic, M. Weiter, Vladimír Lukes
Abstract A systematic study of (7,8-dimethylated) alloxazine, isoalloxazine, and their derivatives with substituted N(1) and N(10) positions was conducted using the density functional theory. The main aim of this work was the direct investigation of substituent effect on the molecular structure. Furthermore, HOMED aromaticity indices were calculated to describe the scope of the geometry changes. Frontier molecular orbitals of reference alloxazine, isoalloxazine and lumichrome derivatives were discussed by means of changes in their shape and energy levels. Photophysical properties were analyzed by determination of optical transition energies using the TD-DFT method. Obtained results were compared with previously published experimental data.
摘要用密度泛函理论对(7,8-二甲基化)异恶唑嗪及其取代N(1)和N(10)位的衍生物进行了系统的研究。本工作的主要目的是直接研究取代基对分子结构的影响。此外,还计算了HOMED芳香性指数来描述几何变化的范围。通过形状和能级的变化,讨论了参比异恶嗪、异恶嗪和lumichrome衍生物的前沿分子轨道。通过TD-DFT方法测定光跃迁能,分析了光物理性质。将获得的结果与先前公布的实验数据进行比较。
{"title":"Theoretical modeling of optical spectra of N(1) and N(10) substituted lumichrome derivatives","authors":"D. Cagardová, J. Truksa, M. Michalík, Jan Richtár, J. Krajcovic, M. Weiter, Vladimír Lukes","doi":"10.2478/acs-2020-0017","DOIUrl":"https://doi.org/10.2478/acs-2020-0017","url":null,"abstract":"Abstract A systematic study of (7,8-dimethylated) alloxazine, isoalloxazine, and their derivatives with substituted N(1) and N(10) positions was conducted using the density functional theory. The main aim of this work was the direct investigation of substituent effect on the molecular structure. Furthermore, HOMED aromaticity indices were calculated to describe the scope of the geometry changes. Frontier molecular orbitals of reference alloxazine, isoalloxazine and lumichrome derivatives were discussed by means of changes in their shape and energy levels. Photophysical properties were analyzed by determination of optical transition energies using the TD-DFT method. Obtained results were compared with previously published experimental data.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49520095","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}
引用次数: 0
Inhibition of staphylococci and S. aureus in wastewater by ferrates and electrochemical methods 高铁酸盐和电化学方法对废水中葡萄球菌和金黄色葡萄球菌的抑制作用
IF 0.8 Pub Date : 2020-10-01 DOI: 10.2478/acs-2020-0023
A. Medveďová, Stanislava Kecskésová, Anna Krivjanská, M. Vojs, M. Marton, J. Filip, Miroslav Fehér, T. Mackuľak
Abstract Increasing concentration of antibiotics in environment and their subinhibitory concentrations in wastewater may result in increased antibiotic resistance of present bacteria. Therefore, this study was aimed to analyze the efficiency of coagulase-positive staphylococci and Staphylococcus aureus inhibition in wastewater by electrochemical methods and addition of ferrates. Advanced electrochemical oxidation by boron doped diamond electrodes in anode; cathode and anode-cathode connection were used for wastewater disinfection. Results showed that the most effective connection was the anodic one, as complete inhibition of coagulase-positive staphylococci as well as of S. aureus was observed after 40 min. Energy consumption was 3.69 kWh/m3 for effluent wastewater disinfection. The second studied method of wastewater disinfection was the application of powdered ferrates. Addition of 100 mg of ferrates resulted in the inhibition of 84—96 % of coagulase-positive staphylococci and 97—99 % of S. aureus in influent water, while the inhibition of coagulase-positive staphylococci and S. aureus was 61—83 % and 83—86 %, respectively, in effluent wastewater.
摘要环境中抗生素浓度的增加及其在废水中的亚抑制浓度可能导致现有细菌的抗生素耐药性增加。因此,本研究旨在分析通过电化学方法和添加高铁酸盐对废水中凝固酶阳性葡萄球菌和金黄色葡萄球菌的抑制效果。硼掺杂金刚石电极在阳极中的高级电化学氧化;阴极和阳极-阴极连接用于废水消毒。结果表明,最有效的连接是阳极连接,因为40分钟后观察到对凝固酶阳性葡萄球菌和金黄色葡萄球菌的完全抑制。废水消毒的能耗为3.69kWh/m3。第二种研究的废水消毒方法是高铁酸盐粉末的应用。添加100mg高铁酸盐对进水中的凝固酶阳性葡萄球菌和金黄色葡萄球菌的抑制率分别为84~96%和97~99%,而对出水中的凝凝固酶阴性葡萄球菌和黄金黄色葡萄球菌分别为61~83%和83~86%。
{"title":"Inhibition of staphylococci and S. aureus in wastewater by ferrates and electrochemical methods","authors":"A. Medveďová, Stanislava Kecskésová, Anna Krivjanská, M. Vojs, M. Marton, J. Filip, Miroslav Fehér, T. Mackuľak","doi":"10.2478/acs-2020-0023","DOIUrl":"https://doi.org/10.2478/acs-2020-0023","url":null,"abstract":"Abstract Increasing concentration of antibiotics in environment and their subinhibitory concentrations in wastewater may result in increased antibiotic resistance of present bacteria. Therefore, this study was aimed to analyze the efficiency of coagulase-positive staphylococci and Staphylococcus aureus inhibition in wastewater by electrochemical methods and addition of ferrates. Advanced electrochemical oxidation by boron doped diamond electrodes in anode; cathode and anode-cathode connection were used for wastewater disinfection. Results showed that the most effective connection was the anodic one, as complete inhibition of coagulase-positive staphylococci as well as of S. aureus was observed after 40 min. Energy consumption was 3.69 kWh/m3 for effluent wastewater disinfection. The second studied method of wastewater disinfection was the application of powdered ferrates. Addition of 100 mg of ferrates resulted in the inhibition of 84—96 % of coagulase-positive staphylococci and 97—99 % of S. aureus in influent water, while the inhibition of coagulase-positive staphylococci and S. aureus was 61—83 % and 83—86 %, respectively, in effluent wastewater.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49636607","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}
引用次数: 0
期刊
Acta Chimica Slovaca
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1