Zapping Viruses: UV Light vs. Hepatitis A in Everyday Liquids

Hepatitis A virus is a tough customer. It can survive in various liquids, making it a challenge to eradicate. Researchers wanted to see how well two types of UV light could knock it out. They tested UV-C light at 254 nanometers and a newer UV-C LED light at 279 nanometers. The goal was to find out how much light was needed to inactivate the virus in different liquids. The liquids tested were phosphate buffered saline, apple juice, and coconut water. Each liquid had a different pH level, which can affect how well the UV light works. The virus was mixed into each liquid and then zapped with UV light for a set amount of time. The researchers stirred the mixtures continuously to ensure even exposure.The results showed that the 279 nanometers UV-C LED light was more effective than the traditional 254 nanometers UV-C light in inactivating the virus in phosphate buffered saline and coconut water. However, in apple juice, the traditional UV-C light was more effective. This suggests that the pH level of the liquid plays a significant role in how well the UV light works. The researchers also found that the virus was most sensitive to the traditional UV-C light in apple juice, followed by coconut water and then phosphate buffered saline. This could be due to the different pH levels and the way the virus interacts with each liquid. Overall, the 279 nanometers UV-C LED light shows promise for inactivating Hepatitis A virus in various liquids. It didn't cause any visible changes to the liquids at the doses tested, which is a big plus. However, more research is needed to see if this method can be scaled up for real-world use.