In this work we explore how to use neutron reflection to study protein adsorption at the oil/water interface. Inter is preferred because we have built technical capability on this instrument. Our specific aims are to (a) determine the actual thickness and volume fraction of globular lysozyme and (b) the effect of pH on the interfacial distribution. The results will enable us to compare the extent of proteins distributed into the oil region between lysozyme and large but less stable BSA at the interface. BSA has a distinct segment distribution in the oil region. The results from lysozyme will enable us to answer if this structural feature is unique to BSA as it contains regions for the delivery of fatty acids and lipids.