Rapid and sensitive determination of ascorbic acid based on label-free silver triangular nanoplates.

Area of Science:

• Nanomaterials Science
• Analytical Chemistry
• Biochemistry

Background:

• Silver triangular nanoplates (Ag TNPs) are susceptible to etching by chloride ions (Cl-).
• Ascorbic acid (AA) is a vital biomolecule with antioxidant properties.
• Colorimetric detection methods offer simple and rapid analysis.

Purpose of the Study:

• To develop a novel colorimetric sensor for the detection of ascorbic acid (AA).
• To utilize the protective effect of AA on Ag TNPs against Cl- induced etching for sensing applications.

Main Methods:

• A colorimetric detection method was designed based on the interaction between AA, Ag TNPs, and Cl- ions.
• The protective effect of AA on Ag TNPs against Cl- induced morphological changes was investigated.
• The sensor's performance was evaluated for AA detection in a specific concentration range.

Main Results:

• Ascorbic acid (AA) was found to protect silver triangular nanoplates (Ag TNPs) from chloride-induced etching.
• The sensor demonstrated a color change from yellow to blue, corresponding to varying AA concentrations.
• The developed sensor achieved selective detection of AA in the range of 0-40.00 μM with a detection limit of 2.17 μM.

Conclusions:

• A selective and sensitive colorimetric sensor for ascorbic acid (AA) detection was successfully developed.
• The method leverages the protective role of AA in preventing the etching of Ag TNPs.
• The sensor is suitable for the colorimetric analysis of AA in real-world samples, such as fruit juices.