This document discusses the development of an electrochemical sensor for detecting beta-carotene levels. It tested various electrode modifications including bare glassy carbon, beta-cyclodextrin methylene blue modified platinum, and decylaniline modified glassy carbon electrodes. The decylaniline modified electrode showed the most promising preliminary results for detecting beta-carotene in serum, though further testing is needed to optimize the sensor and test its specificity. The goal is to create a point-of-care sensor to measure beta-carotene since low levels are associated with health risks.