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Trace element determination in different milk slurries.
E M García1, M L Lorenzo, C Cabrera
1Departamento de Nutrición y Bromatología, Facultad de Farmacia, Universidad de Granada, España.
The Journal of Dairy Research
|December 28, 1999
Summary
This study analyzed trace elements in 90 milk samples using electrothermal atomic absorption spectrometry. Results show varying concentrations of essential and toxic elements, with significant correlations between several pairs, differentiating milk types.
Area of Science:
- Analytical Chemistry
- Food Science
- Environmental Science
Background:
- Milk is a significant dietary source of nutrients and potential contaminants.
- Understanding trace element profiles in different milk types is crucial for nutritional and toxicological assessments.
- Previous studies have not comprehensively analyzed a wide range of trace elements across various milk processing types.
Purpose of the Study:
- To quantify trace elements of nutritional and toxicological importance in diverse milk products.
- To investigate correlations between specific trace element pairs.
- To differentiate between various milk types based on their trace element composition.
Main Methods:
- Analysis of 90 milk samples (whole, low-fat, skim, condensed, evaporated, powdered).
- Sample preparation using Triton X-100 slurries.
- Quantification of trace elements (Pb, Cd, Al, Cu, Cr, Mn, Se, Zn, Ni) via electrothermal atomic absorption spectrometry (ETAAS).
- Optimization of graphite oven temperature-time programs for each element.
- Verification of method accuracy, precision, selectivity, and sensitivity.
- Statistical analysis including correlation analysis and linear discriminant analysis.
Main Results:
- Quantified concentrations for Pb, Cd, Al, Cu, Cr, Mn, Se, Zn, and Ni across milk samples.
- Significant correlations (P < 0.001) were found between Cu-Cd, Mn-Cd, Mn-Cu, Zn-Mn, Ni-Cu, Ni-Mn, and Ni-Zn pairs.
- Linear discriminant analysis successfully differentiated between the six analyzed milk types based on trace element profiles.
Conclusions:
- The study provides a comprehensive dataset on trace element levels in various milk products.
- Identified inter-element correlations suggest common sources or interactions influencing their concentrations in milk.
- Trace element analysis can serve as a reliable method for distinguishing between different milk processing types.