Acta Chimica Slovaca最新文献_第10页

Remediation potential of bacterial mixed cultures for polychlorinated biphenyls (PCBs) biodegradation 细菌混合培养物对多氯联苯（PCBs）生物降解的修复潜力

IF 0.8

Acta Chimica Slovaca Pub Date : 2019-04-01 DOI: 10.2478/acs-2019-0001

H. Horváthová, K. Lászlová, K. Dercová

{"title":"Remediation potential of bacterial mixed cultures for polychlorinated biphenyls (PCBs) biodegradation","authors":"H. Horváthová, K. Lászlová, K. Dercová","doi":"10.2478/acs-2019-0001","DOIUrl":"https://doi.org/10.2478/acs-2019-0001","url":null,"abstract":"Abstract Remediation of polychlorinated biphenyls (PCBs) in minimal mineral water media in the presence of bacterial mixed cultures consisting of several individual strains is proposed. Starting from the fact that the properties and features of bacterial strains in mixed cultures can be supplemented and compensated, two-, three- and seven-membered mixed cultures (MC) were performed. The strains used for the construction of the MC were isolated from the waste canal of a former PCB producer. The highest biodegradation of 70 % of the sum of seven defined PCB congeners was achieved by two-membered MC containing the strains Rhodococcus sp. and Stenotrophomonas maltophilia added in the biomass ratio of 1 : 3 and 3 : 1. PCB biodegradation by a seven-membered MC was lower (58 %) but provided several benefits over the less-membered mixed cultures or the individual strains: similarity to naturally occurring microflora, easier preparation of the inocula, certain and repeatable results. Periodical reinoculation of the water media resulted to PCB biodegradation increase to 65 %. Seven-membered MC was applied to the historically PCB contaminated sediment as well, where a 59 % degradation of the sum of seven PCB congeners was determined.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42193899","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

Thermal inactivation kinetics of Aspergillus oryzae β-galactosidase in concentrated lactose solution 米曲霉β-半乳糖苷酶在乳糖浓溶液中的热失活动力学

IF 0.8

Acta Chimica Slovaca Pub Date : 2018-10-01 DOI: 10.2478/acs-2018-0024

V. Illeová, M. Polakovič

引用次数: 2

Batch drying of sliced tomatoes at specific ambient conditions 番茄切片在特定环境条件下的分批干燥

IF 0.8

Acta Chimica Slovaca Pub Date : 2018-10-01 DOI: 10.2478/acs-2018-0019

Mohammad Jafar Royen, A. Noori, J. Haydary

{"title":"Batch drying of sliced tomatoes at specific ambient conditions","authors":"Mohammad Jafar Royen, A. Noori, J. Haydary","doi":"10.2478/acs-2018-0019","DOIUrl":"https://doi.org/10.2478/acs-2018-0019","url":null,"abstract":"Abstract In this work, drying of tomato slices was studied in a laboratory scale batch dryer working at conditions specific for geographical locations with low ambient pressure and low relative humidity of air. Tomato is a perishable farm product with high moisture content. Despite their high value, tomatoes are subjected to wastage and spoilage during their seasonal period; to last longer after harvested, they need to be treated by drying. Drying is one of the most widely used methods of tomato preserving for a longer period of time. This study involves experimental work on tomatoes drying in a tray laboratory batch dryer with the dimensions of (490 × 330 × 310) mm, a load cell-force sensor (range: 0–5 kg), fan (speed: 0–2500 rpm), air flow sensor (0–150 l/min) and a temperature and humidity monitoring system. This study was aimed at the development of a suitable drying method for the production of dehydrated agricultural products under specific air properties and climate conditions such as low ambient pressure and low relative humidity. During the experiment, the average ambient pressure was 82 kPa, and the average relative humidity of air was 20 %. Drying characteristics of tomato slices were determined at three temperature levels, namely: 50 °C, 60 °C and 70 °C,and three air flow rates: 30 l/s, 40 l/s and 50 l/s, for each temperature level. In this study, the effect of temperature, air flow rate, and ambient conditions on the drying rate of tomato slices were studied. The results indicate that during the experiments, tomatoes were dried to the final moisture content of 32.2 % from 92 %. Drying time at 50 °C, 60 °C and 70°C, and air flow of 30 l/s was 17.80 h, 15.80 h, and 14.08 h, respectively. For the air flow rate of 40 l/s, the drying time was 15.0 h, 12.9 h and 11.7 h and for the air flow rate of 50 l/s, the drying time of tomato slices was 14.0 h, 11.6 h and 10.2 h, respectively.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46652052","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: 3

HPLC separation of panthenol enantiomers on different types of chiral stationary phases 泛醇对映体在不同手性固定相上的高效液相色谱分离

IF 0.8

Acta Chimica Slovaca Pub Date : 2018-10-01 DOI: 10.2478/acs-2018-0017

Anna Lomenova, K. Hroboňová, Terézia Šolónyová

{"title":"HPLC separation of panthenol enantiomers on different types of chiral stationary phases","authors":"Anna Lomenova, K. Hroboňová, Terézia Šolónyová","doi":"10.2478/acs-2018-0017","DOIUrl":"https://doi.org/10.2478/acs-2018-0017","url":null,"abstract":"Abstract Panthenol is a biologically active compound closely related to vitamin B5 (pantothenic acid). This work deals with the separation of panthenol enantiomers using high performance liquid chromatography. Different types of chiral stationary phases (β-cyclodextrin, isopropyl carbamate cyclofructan 6, amylose tris(3,5-dimethylphenylcarbamate)) were tested in normal phase separation mode. Effect of mobile phase composition on the resolution and retention of enantiomers was studied. Two types of detectors, low-wavelength UV and polarimetric, were used. The optimal chromatographic system includes a chiral stationary phase based on amylose and a mobile phase of hexane/ethanol (60/40, v/v) where the resolution of enantiomers reached the value Rs = 2.49. Suitable chromatographic conditions were applied for the determination of panthenol enantiomers in samples of pharmaceutical preparations with the obtained recovery of more than 92 %. Linearity of the high performance liquid chromatography method with spectrophotometric detection was from 1.0 × 10−3 to 1.3 mg mL−1 (R2 = 0.998), with the limit of detection of 0.3 × 10−3 mg mL−1 for both enantiomers.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42192602","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: 5

The design and NMR structure determination of yttrium-oligopeptide tags for recombinant proteins and antibodies 用于重组蛋白质和抗体的钇寡肽标签的设计和NMR结构测定

IF 0.8

Acta Chimica Slovaca Pub Date : 2018-10-01 DOI: 10.2478/acs-2018-0018

Marcela Múdra, M. Breza, Lucia Lintnerová, J. Filo, J. Bauer