Skład chemiczny etanolowego ekstraktu z propolisu i jego aktywność biologiczna wobec grzybów pleśniowych

2018 ◽  
Vol 19 (2) ◽  
Author(s):  
Magdalena Woźniak ◽  
Patrycja Kwaśniewska-Sip ◽  
Marta Babicka ◽  
Agnieszka Waśkiewicz ◽  
Grzegorz Cofta ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Biological Activity ◽  
Biological Activities ◽  
Spectrometric Method ◽  
Natural Material ◽  
Mass Spectrometric Method ◽  
Toxic Heavy Metals ◽  
Propolis Extract ◽  
Flame Atomic Absorption ◽  
Tandem Mass Spectrometric

Introduction. Propolis is a natural material whose extracts indicate numerous biological activities, including antifungal, antibacterial, antioxidant and anticancer. Phenolic compounds (flavonoids as well as phenolic acids and their esters) are one of the most frequently mentioned group of propolis components responsible for the biological activity of propolis extracts. Another group of components identified in propolis is elements, including macro- and microelements as well as heavy metals. Aim. The aim of the study was to determine the biological activity of the ethanolic propolis extract originated form Warmian-Masurian Voivodeship against moulds and to analyze concentration of selected flavonoids and elements present in the extract. Material and methods. The biological activity of the propolis extract obtained from a raw propolis originated from Warmian-Masurian Voivodeship against moulds was determined by dilution in nutrient solution. The content of selected flavonoids (apigenin, pinocembrin, kaempferol and galangin) in the propolis extract was determined using ultra-performance liquid chromatography photodiode array detection tandem mass spectrometric method. The concentration of elements in the propolis extract was analyzed by flame atomic absorption spectrometry. Results. The propolis extract was characterized by activity against all tested fungal strains. It showed the highest activity towards Chaetomium globosum and Penicillium cyclopium. Among analyzed flavonoids, the highest concentration in the propolis extract was determined for pinocembrin. In addition, high concentrations of Na, Mg, K, Ca and Fe were found in the propolis extract, and no toxic heavy metals were found. Conclusions. The ethanolic propolis extract of national origin shows biological activity against tested moulds and it is a valuable source of flavonoids, as well as macro- and microelements.

Tandem Mass Spectrometric Evaluation of Core Structures of Aromatic Compounds after Catalytic Deoxygenation

2017 ◽  
Author(s):  
Xueming Dong
Keyword(s):  
Aromatic Compounds ◽  
Supported Catalyst ◽  
Mass Spectrometric ◽  
Spectrometric Method ◽  
Mass Spectrometric Method ◽  
Aromatic Rings ◽  
Tandem Mass Spectrometric ◽  
Catalytic Deoxygenation ◽  
Oxygen Atoms

Catalytic deoxygenation of coal enhances the stability and combustion performance of coal-derived liquids. However, determination of the selectivity of removal of oxygen atoms incorporated in or residing outside of aromatic rings is challenging. This limits the ability to evaluate the success of catalytic deoxygenation processes. A mass spectrometric method, in-source collision-activated dissociation (ISCAD), combined with high resolution product ion detection, is demonstrated to allow the determination of whether the oxygen atoms in aromatic compounds reside outside of aromatic rings or are part of the aromatic system, because alkyl chains can be removed from aromatic cores via ISCAD. Application of this method for the analysis of a subbituminous coal treated using a supported catalyst revealed that the catalytic treatment reduced the number of oxygen-containing heteroaromatic rings but not the number of oxygen atoms residing outside the aromatic rings.<br>

Tandem Mass Spectrometric Evaluation of Core Structures of Aromatic Compounds after Catalytic Deoxygenation

2017 ◽  
Author(s):  
Xueming Dong
Keyword(s):  
Aromatic Compounds ◽  
Supported Catalyst ◽  
Mass Spectrometric ◽  
Spectrometric Method ◽  
Mass Spectrometric Method ◽  
Aromatic Rings ◽  
Tandem Mass Spectrometric ◽  
Catalytic Deoxygenation ◽  
Oxygen Atoms

Catalytic deoxygenation of coal enhances the stability and combustion performance of coal-derived liquids. However, determination of the selectivity of removal of oxygen atoms incorporated in or residing outside of aromatic rings is challenging. This limits the ability to evaluate the success of catalytic deoxygenation processes. A mass spectrometric method, in-source collision-activated dissociation (ISCAD), combined with high resolution product ion detection, is demonstrated to allow the determination of whether the oxygen atoms in aromatic compounds reside outside of aromatic rings or are part of the aromatic system, because alkyl chains can be removed from aromatic cores via ISCAD. Application of this method for the analysis of a subbituminous coal treated using a supported catalyst revealed that the catalytic treatment reduced the number of oxygen-containing heteroaromatic rings but not the number of oxygen atoms residing outside the aromatic rings.<br>

scholarly journals Development and validation of a liquid chromatography-tandem mass spectrometric method for the determination of lenalidomide in human plasma and its application on bioequivalence studies

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
R. Gopinath ◽  
S. T. Narenderan ◽  
M. Kumar ◽  
B. Babu
Keyword(s):  
Liquid Chromatography ◽  
Human Plasma ◽  
Internal Standard ◽  
Spectrometric Method ◽  
Tandem Mass ◽  
Mass Spectrometric Method ◽  
Mass Detection ◽  
Triple Quadrupole Mass Spectrometer ◽  
Liquid Chromatography Tandem Mass ◽  
Tandem Mass Spectrometric

AbstractA simple, sensitive, and specific liquid chromatography-tandem mass spectrophotometry (LC-MS/MS) method was developed and validated for the quantification of lenalidomide in human plasma. The separation was carried out on a symmetry, C18, 5-μm (50 × 4.6 mm) column as stationary phase and with an isocratic mobile phase of 0.1% formic acid in water-methanol in the ratio of (15:85, v/v) at a flow rate of 0.5 mL/min. Protonated ions formed by electrospray ionization in the positive mode were used to detect analyte and fluconazole (internal standard). The mass detection was made by monitoring the fragmentation of m/z 260.1/148.8 for lenalidomide and m/z 307.1/238.0 for internal standard on a triple quadrupole mass spectrometer. The developed method was validated over the concentration range of 10–1000 ng/mL for lenalidomide in human plasma with a correlation coefficient (r2) was 0.9930. The accuracy and precision values obtained from six different sets of quality control samples analyzed on separate occasions ranged from 99.41 to 106.97% and 2.88 to 4.22%, respectively. Mean extraction recoveries were 98.06% and 88.78% for the analyte and IS, respectively. The developed method was successfully applied for analyzing lenalidomide in human plasma samples.

scholarly journals Inter-Laboratory Validation of Method to Determine Residual Enrofloxacin in Chicken Meat

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Joo Hee Chung ◽  
Kun Cho ◽  
Seongnyeon Kim ◽  
So Hyeon Jeon ◽  
Jeoung Hwa Shin ◽  
...  
Keyword(s):  
Solid Phase ◽  
Chicken Meat ◽  
Spectrometric Method ◽  
Mass Spectrometric Method ◽  
Liquid Liquid Extraction ◽  
Acceptable Range ◽  
Regulatory Testing ◽  
Liquid Chromatography Tandem Mass ◽  
Preparation Step ◽  
Tandem Mass Spectrometric

An inter-laboratory study was performed to evaluate the performance of a method developed for the quantification of enrofloxacin in chicken meat. Liquid-liquid extraction combined with a clean-up procedure based on solid-phase extraction followed by a liquid chromatography-tandem mass spectrometric method was used by three individual laboratories. All the investigated results of calibration curves and limits of quantification were within the acceptable range for regulatory testing of enrofloxacin. The three laboratories received blind a certified reference material to analyze in triplicate and assess using statistical analysis. From the results, no statistical differences were found between the laboratories in the precision of the method. Additionally, all the results of the z-score, which is an indication of fixed interval bias criteria for accuracy from the laboratories, fell within the allowable limits (±2σ). Based on this proficiency testing by inter-laboratory comparisons, the analytical method including the sample preparation step was proven to be applicable.

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