Authentication of fruit juices is a major challenge for an industry that is fast growing and expanding. Traditional methods to monitor authenticity such as HPLC, GC or sensory methods are time consuming and require well-trained personnel. There is a need for a rapid, easy to use, inexpensive method to monitor the authenticity of fruit juices. Infrared technology has gained acceptance as a rapid and reliable technique. It can be used to evaluate the overall sample composition, providing a fingerprint that is characteristic of the product. This eliminates the need to test for several individual components. Multivariate statistical analyses are used to evaluate the infrared spectral information. This technique could be used to determine addition of foreignmaterials, differentiate different juice commodities, or even to evaluate geographical origin of a juice. © 2011 American Chemical Society.