Dear Jessica, The following method is what we learned and what we still teach our students. Volume - Displacement method In the displacement method, the volume of a baked product is found by subtracting the volume of low density seeds such as rapeseeds held in a container with and without the product. The container can be a straight sided box, a can, or volume meter, an apparatus build like an hour glass. If a cake is baked in a pan with sides that are higher than the product its seed displacement can be found by pouring seed on top of the cake while it is still in the pan. The volume of seed required to fill the pan then is subtracted from the empty pan. After the volume of a baked produce has been determined, it may be divided by the weight of the product and reported as a specific volume, in units of cubic centimeters per gram. This calculation facilitates comparison of products having different weights. The comparison is also facilitated if the same weight of batter is baked for each product. When the displacement method is used, scoring must be delayed or done on a duplicate product at a time when it is not soft, often after 24 hours (AACCI Method 10-05.01). References: Cathcart, W. H. and Cole, L.C. 1938. Wide-range volume-measuring apparatus for bred. Cereal Chem. 15:69. Brown, S. L. and Zabik, M. E. 1976. Effect of heat treatments on the physical and functional properties of liquid and spray-dried egg albumen. Food Technol. 21:87. Campbell, A. M., Penfield, M. P. and Griswold, R. M. 1980. The experimental study of food. London, Great Britain. Houghton Mifflin Company. Yours sincerely, Associate of the Institute of Food, Nutrition and Well-being Professor: Department of Animal and Wildlife Sciences University of Pretoria South Africa Tel: + 27 (0) 12 348 6649 Cell: +27 (0) 83 458 2757 On 11 May 2015 at 14:12, Jessica (Bioversity) Raneri <[log in to unmask]> wrote: > Dear Infoods Members, > > We’re currently attempting to identify the density conversion factors of > some unique foods in Vietnam in order to analyse 24hr recall data. Is > anyone aware of guidelines or best-practices manual on how to calculate > these densities? We would like to eventually make the data publically > available. > > Many thanks in advance. > > > *Jessica Raneri, MSc *Nutritionist, Research Support Officer > *Nutrition and Marketing Diversity Programme, * > *Bioversity International* <http://www.bioversityinternational.org/> > Via dei Tre Denari, 472/a > 00057 Maccarese (Fiumicino) > Rome, Italy > > P Please consider the environment before printing this e-mail > > > > > ------------------------------ > > To unsubscribe from the InFoods-Food-Comp-L list, click the following link: > https://listserv.fao.org/cgi-bin/wa?SUBED1=InFoods-Food-Comp-L&A=1 > ######################################################################## To unsubscribe from the InFoods-Food-Comp-L list, click the following link: https://listserv.fao.org/cgi-bin/wa?SUBED1=InFoods-Food-Comp-L&A=1