A team of researchers from the University of Queensland has created a groundbreaking nanoprobe that changes colour to indicate the level of vitamin C in fresh fruits and vegetables. This innovation, developed by scientists at the Australian Institute for Bioengineering and Nanotechnology (AIBN), offers a rapid and efficient way to assess the nutritional content of food.
The nanotechnology, spearheaded by Dr Run Zhang and PhD scholar Dihua Tian, allows for vitamin C concentration measurements either directly in food samples or through paper testing strips. These strips can be applied to either whole or cut produce, changing colour based on the vitamin C levels detected.
Vitamin C, also known as ascorbic acid, is a vital antioxidant found in many fruits and vegetables. Its levels can vary significantly depending on various factors, including the time taken from farm to fridge, exposure to light, heat, and oxygen, as well as agricultural practices such as soil quality and pesticide application. Dr Zhang noted the importance of measuring vitamin C, particularly for producers and consumers interested in evaluating food freshness and nutritional value.
The nanoparticle probes consist of a metallic core coated with a fluorescent dye. When exposed to ascorbic acid, the coating disintegrates, and the remaining materials change colour to reflect the vitamin C concentration in the sample. The simplicity of this technology paves the way for a potential smartphone application that could enhance user experience.
Dihua Tian expressed enthusiasm about the future of this technology, stating, “We see great potential for more user-friendly analysis.” The team envisions a scenario where colour-visualising applications on smartphones can scan testing strips and provide precise information regarding the freshness and health benefits of food.
The applications of this technology extend beyond consumer use; it also holds promise for agricultural practices. By testing the vitamin C content in plant leaves, producers could obtain valuable insights into plant nutrition, stress responses, and optimal farming methods. Dr Zhang emphasized the potential for supporting environmental sustainability through improved nutrient management in crops.
The findings of this research have been published in the journal Food Chemistry. While the colour changes in the nanoprobes can be observed with the naked eye, visualisation apps could enable a more detailed analysis, making this technology a significant advancement in both food safety and agricultural practices.
