Trace elements determination by energy dispersive X-ray fluorescence (EDXRF) in human placenta and membrane: a comparative study

Abstract

This work is an application of energy dispersive X-ray fluorescence (EDXRF) as an analytical technique for trace elemental determination in human membrane and placenta and elemental concentrations correlations in both tissues. Whole samples were collected during the delivery from healthy mothers and full-term pregnancies. The age of the mother was between 25 and 40 years old, and the weight of the infants ranged from 2.56 to 4.05 kg. Samples were lyophilised and analysed without any chemical treatment. No significant differences in elemental content of placenta and membrane samples were observed except for Ca. Very low levels of Se, As and Pb were observed in all the analysed samples. Zn, considered as one of the key elements in newborn health, was not significantly different in the analysed samples, all of which originated from healthy mothers and healthy babies. The obtained values agree with the literature except for Ca, which is much higher in the studied samples.

Effect of sex, maturation stage and cooking methods on the nutritional quality and safety of black scabbard fish (Aphanopus carbo Lowe, 1839)

“…The energy resolution was 135 eV at 5.9 keV and the acquisition system was a Nucleus PCA card. Quantitative calculations were made by the fundamental parameters method 24. The X‐ray generator was operated at 50 kV, 20 mA and 1000 s acquisition time.…”

“…Quantitative calculations were made by the fundamental parameters method. 24 The X-ray generator was operated at 50 kV, 20 mA and 1000 s acquisition time. Each freezedried sample powder (1 g) was pressed into 2 cm diameter pellets (n = 3) without any chemical treatment and glued onto Mylar films on sample holders and placed directly in the X-ray beam.…”

Comparative study of elemental content in farmed and wild life Sea Bass and Gilthead Bream from four different sites by FAAS and EDXRF

“…The quantitative evaluation was performed by the fundamental parameters method which makes use of the fundamental parameters such as cross-sections for absorption and X-ray production, transition intensities, fluorescence yields etc. (Custódio, Carvalho, & Nunes, 2003).…”

Chemical composition of Atlantic spider crab Maja brachydactyla: Human health implications

“…The energy resolution was 135 eV at 5.9 keV and the acquisition system was a Nucleus PCA card. Quantitative calculations were made by the fundamental parameters method (Custó dio et al, 2003). The X-ray generator was operated at 50 kV, 20 mA and acquisition time of 1000 s. Each dried sample was homogenized with a grinder (1 g; n = 20 for each tissue) and pressed into pellets of 2 cm diameter without any chemical treatment, glued onto Mylar films on sample holders, and placed directly in the X-ray beam.…”