Abstract
The present study represents the determination of Ti and Cr in dry animal feeds using wet acid digestion and inductively coupled plasma–atomic emission spectrometry (ICP-AES), in order to use these metals as digestibility markers. A radiofrequency power of 1350 W and a nebulizer argon flow of 0.8 L/min was selected. The limits of detection were between 11.4 and 16.1 μg/g for titanium and between 10.7 and 38.2 μg/g for chromium. The recovery values for the aqueous solutions were 89.5–103.9% (titanium) and 85.3–104.2% (chromium), with relative standard deviations (RSD%) under 2.1% and standard errors under 2.32%, demonstrating that the method offered good accuracy and repeatability. Six different samples of commercially available feedstuffs (two cat foods, two dog foods, and two poultry foods) were analyzed and the levels of investigated metals were found to be in the ranges of 0.10 g/kg and <LOD for chromium and titanium, respectively (dog foods); 0.10–0.18 g/kg, 0.70 g/kg for chromium and titanium, respectively (cat foods); and 0.07 g/kg, 0.82–1.35 g/kg for chromium and titanium, respectively (poultry foods).
Highlights
In recent years, the population of pets has grown, resulting in the increase of the production of pet food [1]
Six different samples of commercially available feedstuffs were analyzed and the levels of investigated metals were found to be in the ranges of 0.10 g/kg and
This study focused on the determination of the total concentrations of the most common exogenous markers in dry feedstuffs, chromium and titanium
Summary
The population of pets has grown, resulting in the increase of the production of pet food [1]. This study focused on the determination of the total concentrations of the most common exogenous markers in dry feedstuffs, chromium and titanium. The present study used an analytical method for the simultaneous determination of the total concentration of Ti and Cr in pet feedstuffs, using the inductively coupled plasma–atomic emission spectrometry (ICP-AES) technique. Among the most frequent sample preparation techniques for food and animal food analysis using spectroanalytical methods such as ICP-AES are dry ashing and wet acid digestion [15]. Based on the above studies, in the present work, the use of a wet acid digestion method was employed for the complete decomposition of dry feedstuff prior to the chemical analysis of the samples using an ICP-AES technique. The method can be applied to monitoring of titanium or chromium levels by ICP-AES technique when used as external markers during digestibility studies
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