Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
 
Articles by Jacek Namiesnik
Total Records ( 3 ) for Jacek Namiesnik
  Kamila Klimaszewska , Costel Sarbu , Zaneta Polkowska , Barbara Walna and Jacek Namiesnik
  A highly informative chemometrical method using linear discriminant analysis was employed in this paper for the characterisation and classification of hoarfrost samples collected in Poland. From the classification matrix, it was concluded that good discrimination (an overall 69% correct classification and 93% correct classification for the samples originated from Gdańsk) between hoarfrost samples of different origin could be achieved by using the ion concentrations retained in the model. Discriminant analysis was not only used for classifying the hoarfrost samples according to origin and location but also for detecting the most important variables that discriminate between the groups. It was found, according to different statistical parameters, that the highest contribution to the discriminatory power of the model was given by NO3*=0814; F=5.54), PO43–*=0.888; F=3.06) and F-*= 0.892; F = 2.92). The smallest contribution was observed for Mg2+*=0.961; F=0.98). The results obtained in this study illustrate that discriminant analysis allows a rational classification and grouping of hoarfrost samples using chemical composition for their characterisation.
  Marta Staniszewska , Barbara Radke , Jacek Namiesnik and Jerzy Bolatek
  The determination of organotin compounds in bottom sediments is a complex process that requires a number of analytical steps, i.e. sample collection, transport and storage; extraction of analytes from sediment; derivatization; extract purification; enrichment; and the final chromatographic measurement. The whole process is time and labour consuming, and subject to securing sample representativeness. In this review the most frequently encountered problems and the examples of possible analytical solutions are presented, which encompass the specific steps of speciation analysis of these toxic compounds.
  Myang Hee Im , Yong-Seo Park , Kyung-Sik Ham , Seong-Gook Kang , Buk-Gu Heo , Hanna Leontowicz , Maria Leontowicz , Jacek Namiesnik , Kasia Najman and Shela Gorinstein
  Bioactive compounds and antioxidant potentials were determined in fresh lotus roots and subjected to boiling for different periods of time (10, 20, 40, and 60 min). The obtained results were compared with the same indices in fresh and boiled white onions. It was found that fresh vegetables contained higher quantities of bioactive compounds than those boiled for 10 min, and these indices were significantly higher in fresh white onions than in fresh lotus roots (P < 0.05). Polyphenols (mg GAE/g) were 3.65 ± 0.2a and 10.48 ± 0.5b; flavanols (μg CE/g) −44.13 ± 2.8a and 91.94 ± 4.3b; flavonoids (mg CE/g) −0.54 ± 0.02a and 1.04 ± 0.03b; anthocyanins (mg CE/kg) −20.61 ± 1.2a and 28.34 ± 1.3b; and tannins (mgCE/g) −0.58 ± 0.02a and 1.69 ± 0.03b of lotus roots and white onions, respectively. The highest antioxidant potential was registered in fresh lotus roots and fresh white onions (10.1 ± 0.70a and 15.0 ± 0.8b; 8.1 ± 0.4a and 23.05 ± 1.1b; 18.7 ± 0.9a and 26.9 ± 1.3b μM TE/g for FRAP, DPPH, and CUPRAC, respectively (P < 0.05) and 26.9 ± 1.5a and 24.14 ± 1.1a μM TE/g for ABTS (P > 0.05). The influence on tumor cell lines Calu-6 (% of cell viability) of fresh lotus roots (75.61 ± 2.03) and boiling boiled for 10 min (76.54 ± 3.14) was significantly higher (P < 0.05) than for fresh white onions (94.18 ± 3.67) and 10 min (97.02 ± 4.16) white onion. By comparison, the tumor cell lines SNU-601 (% of cell viability) showed similar data for both fresh and boiled vegetables in the range of 86.45 ± 4.07 to 87.28 ± 2.42. In conclusion, the boiling led to a decrease of bioactivity; however, lotus demonstrated higher thermostability than white onions. Three-dimensional fluorescence can be used as an additional index for evaluation of properties. Fresh and boiled (for 10 min) lotus roots and white onions could be considered as a functional food with high antioxidative and antiproliferative activities.
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility