Whole blood selenium determination by inductively coupled plasma mass spectrometry

Higher Levels of Blood Selenium are Associated with Higher Levels of Serum Lipid Profile in US Adults with CKD: Results from NHANES 2013-2018

The association between selenium (Se) and lipid profile has been controversial in different populations, and the aim of the study was to investigate the relationship between Se and lipid profile in patients with chronic kidney disease (CKD). A total of 861 US adult patients with CKD (male: female = 404:457) from the National Health and Nutrition Examination Survey database were enrolled in this cross-sectional study. We used smoothing spline plots and multivariate binary logistic regression analyses to elucidate the relationships between blood Se and lipid profile. Multivariate adjusted smoothing spline plots showed that higher levels of blood Se were associated with higher levels of serum remnant cholesterol (RC), total cholesterol (TC), triglycerides (TG), and low-density lipoprotein cholesterol (LDL-C) levels. Threshold and saturation effects were also observed between serum RC, TC, TG, LDL-C, and blood Se. In multivariate binary logistic regression analyses, the fully adjusted model showed that as blood Se increases by every 1 µg/L, the OR of high RC, high TG and high LDL-C in patients was 1.012 (95% CI: 1.001, 1.023 P = 0.046), 1.011 (95% CI: 1.001, 1.021 P = 0.043) and 1.009 (95% CI: 1.003, 1.016 P = 0.012), respectively. Furthermore, stratified analyses showed that the associations between blood Se and high RC/high TG were significantly stronger in patients aged < 65 years. Higher levels of blood Se were associated with increased serum lipid profile levels and increased risk of high RC, high TC, high LDL-C, and low HDL-C dyslipidemia in adult patients with CKD in the US. However, the real associations between blood Se and lipid profiles in this population should be verified in future prospective and randomized trials.

An efficient and low-cost method for the determination of selenium in selenium-enriched tea by high-performance liquid chromatography coupled with 3,3'-Diaminobenzidine derivatization

In this study, a novel analytical method was developed and validated for the quantification of selenium in selenium-enriched tea. The various valence states of selenium present in tea were converted to Se(IV) through oxidation and reduction reactions. To chemically react with Se(IV), 3,3'-Diaminobenzidine (DAB) was employed to produce Se-DAB derivatives. These derivatives were then analyzed and quantified using high-performance liquid chromatography (HPLC) with a NH2 column specifically designed for the target compound. The peak area of Se-DAB exhibited excellent linearity within the concentration range of 0.01-50 μgmL-1 (R2 = 0.9999). The method demonstrated a limit of detection (LOD) of 0.01 mgkg-1 and a limit of quantification (LOQ) of 0.03 mgkg-1. Moreover, the recoveries of Se-DAB spiked at different concentrations ranged from 81.2 % to 96.7 %, with relative deviations (RSDs) of 0.72 %-4.23 % (n = 6). Additionally, the RSDs under different batches varied from 3.42 % to 8.57 % (n = 9). The method exhibits good stability and repeatability. The results obtained by applying the method to 24 samples of selenium-rich tea show high consistency with the AFS method. The difference range between the two methods is 0.017-0.027 mg/kg, with an average difference of 0.005 mg/kg. Furthermore, this method offers the advantage of flexibility in analyzing large quantities of green tea samples, while utilizing lower instrument and reagent costs. Therefore, it can be considered as a new and cost-effective method for detecting selenium content in selenium-rich tea.

Development of an efficient sample preparation method for the speciation of Se(iv)/Se(vi) and total inorganic selenium in blood of children with acute leukemia

In this study, a new solidified deep eutectic solvent microextraction (SDES-ME) method was applied for the speciation of Se(iv), Se(vi) and total inorganic selenium in the blood of children with leukemia from Kermanshah, Iran, prior to analysis by iridium-modified tube graphite furnace atomic absorption spectrometry (GFAAS).