The butter cakes were produced based on the method of Chareonsinsab et al. (2005) and the formulae are presented in Table 1. Wheat flour in the formulation was replaced with 0 (control), 1.5, 3.0, 4.5% BPC and 3.0% CC. The production of butter cake is summarized as follows. Fresh butter was beaten until it rose, the sugar was then added, the beating was continued until the butter turned white, then yolk, egg-white, some of the baking powder, milk and vanilla were added. Finally, lime juice and the rest of the baking powder were added and the mixture was further beaten for 5 min. The batter was transferred into 6-cm inside-diameter greased cake cups and baked at 150°C for 25 min in an oven. The baked cakes were cooled at ambient temperature for 30 min and then packed in plastic bags with a zip lock and kept for further analysis. All analyses were conducted in duplicate.