1Department of Biomedical Engineering, North Eastern Hill University, Shillong, Meghalaya, India – 793022. Email: shyamalmandaliit@gmail.com
2Department of Electronics and Communication Engineering, North Eastern Hill University, Shillong, Meghalaya, India – 793022
*Corresponding Author: nitinbiomedical@gmail.com
Background: Hydrogen and oxygen combine to form the chemical ammonia (NH₃). It can have a major impact on aquatic plants and animals and is commonly found in wastewater. It's crucial for maintaining the balance of ecosystems and human health. Less than 1.5 mg/L is the threshold level of ammonia in drinking water that should be present. Main sources of NH₃ in river water is biomass and various types of fertilizers.
Methodology: Ammonia can be detected in water using a variety of techniques, such as pH and ion-selective electrode approaches, but gold nanoparticle-based colorimetric methods are the most distinctive and straightforward because they allow ammonia to be easily recognized, even though the NH₃ solution colorless. The capacity of gold nanoparticles (AuNPs) to detect NH₃ at room temperature has been created and tested. The presence of ammonia in water is indicated by the redshift of a resonant peak in the absorption spectra, which is mostly explained by the chemical bonding that forms between AuNPs and NH₃ at the defect sites. Additionally, it mostly reacts with oxygen absorbents on AuNPs' surface, which causes it to exhibit sensing behavior.
Results: In this study we successfully achieved the green synthesis of AuNPs using pineapple extract which perform as reducing and capping agent. In present work we successfully measured the ammonia level at 200 µl to a maximum of 4900 µl.
Conclusion: Results also conclude that if material surfaces were modified with AuNPs can be applied for drug loading using electrostatic interaction.
Keywords: Colorimetric, Ammonia (NH₃), Gold nanoparticles (AuNPs), Sensing, Spectra, Colour change, Drug loading
How to cite this article: Mandal S, Sahai N. Colorimetric Detection of Ammonia in Water by Using Biosynthesized Gold Nanoparticles. Int J Drug Deliv Technol. 2026;16(13s): 640-645. DOI: 10.25258/ijddt.16.13s.71
Source of support: Nil.
Conflict of interest: None