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K Szymczyk

Publications and source records attributed to K Szymczyk.

At least 19 recordsLinked to original sources
PubMed2001

Application of ICP sector field MS and principal component analysis for studying interdependences among 23 trace elements in Polish beers.

Twenty-three metallic elements, including almost all essential and toxic metals such as lead, cadmium, mercury, arsenic, silver, and thallium, have been quantified in 35 types of bottled and canned Polish beer by using double-focusing sector field inductively coupled plasma mass spectrometry (ICP-MS) with ultrasonic nebulization. The samples were digested using concentrated HNO3 in closed PTFE vessels and applying microwave energy under pressure. The means and medians of the concentrations of Rb, Mn, and Fe were on the order of 200 ng/mL; Cu, Zn, V, Cr, Sn, As, Pb, and Ni were detected at 1-5 ng/mL; Ag, Ga, Cd, Co, Cs, Hg, U, and Sb were found at < 1 ng/mL; and In, Tl, Bi, and Th were present at < 0.1 ng/mL. The concentrations of Hg, Cd, As, Pb, and Zn were 1-3 orders of magnitude lower than proposed tolerance limits. The interdependences among determined trace elements were examined using the principal component analysis (PCA) method. The PCA model explained 74% of the total variance. The metals tend to cluster together (As, Tl, Cs, Sn, Th, Bi, and Hg; Cd and Co; Cs and Cr; Fe and Zn; Mn and V).

Beer↗
PubMed2001

ICP/MS and ICP/AES elemental analysis (38 elements) of edible wild mushrooms growing in Poland.

Thirty-eight elements, including toxic cadmium, lead, mercury, silver and thallium, were determined in 18 species of wild edible mushrooms collected from several sites in Pomorskie Voivodeship in northern Poland in 1994. Elements were determined by double focused high resolution inductively coupled plasma mass spectrometry (HR-ICP-MS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES), after wet digestion of the dried samples with concentrated nitric acid in closed PTFE vessels using a microwave oven. K, P and Mg were present at levels of mg/g dry matter; Na, Zn, Ca, Fe, Cu, Mn, Rb, Ag, Cd, Hg, Pb, Cs, Sr, Al and Si were present at microg/g levels, while Tl, In, Bi, Th, U, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, La, Lu and Ba were present at ng/g levels.

Agaricales↗
PubMed1995

[Use of HPLC technique for determination of aspartame and acesulfam-K in processed fruit products].

A liquid chromatographic method for the determination of the intense sweeteners--aspartame and acesulfam-K in fruit and vegetable nectars was described. Samples were extracted with water, then clarified with Carrez solutions. An aliquot of the extract was analyzed on C-18 reverse-phase column with UV detection. Mean recoveries ranged from 95.9 to 101.8%. The method is suitable for routine determinations of both sweeteners.

Aspartame↗
PubMed1992

[Neurofibromatosis of the head and neck].

The source of development of neurofibromas, their incidence, tendency for recurrences and malignant transformation are reviewed. The main signs of von Recklinghausen disease and the difficulties in its diagnosis are discussed. A case of faciocervical neurofibromatosis with recurrences is presented stressing the importance of adequate therapeutic-prophylactic management is stressed, in view of increased predisposition to recurrences and malignant transformation.

Head and Neck Neoplasms↗
PubMed1991

[Carcinoid of the larynx].

The case of carcinoid of the larynx is presented. Attention is focused on the difficulties with establishing the diagnosis. The principles of treatment this kind of neoplasm are reported.

Adult↗