Overview
Shinde and colleagues developed casein peptide-functionalized gold nanoparticles as a colorimetric aggregation probe for aluminum (Al3+) detection. Al3+ induces AuNP aggregation, shifting the surface plasmon resonance from 530 nm to 700 nm with a visible red-to-blue color change. Gold is the analytical probe; aluminum is the target analyte. The sensor was validated in drinking water, tap water, river water, urine, and an ionic drink at concentrations spanning the WHO guideline range for aluminum in drinking water.
Key numbers
LOD: 20 ppb (0.067 µM) Al3+. Linear range: 10 to 50 ppb. WHO guideline for Al3+ in drinking water is 200 ppb (7.41 µM); this sensor detects at one-tenth of the guideline value. Recovery in spiked ionic drink: approximately 100%.
Implications for the wiki
This paper contributes to Gold as documentation of AuNP-based sensing platforms for aluminum monitoring in water and beverages. It also provides analytical method context for Aluminum. No food occurrence data for gold or aluminum are provided as natural occurrence values.
Related evidence
Update history
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