Dear Josefa, Thank you for clarifying the issue to me. So we are talking about the non-esterified fatty acids naturally present in food, and not how we express fatty acid data in food composition databases/tables. Do you have any references to the content of non-esterified fatty acids in food? Thanks, Anders From: Food Composition Discussion Group [mailto:[log in to unmask]] On Behalf Of [log in to unmask] Sent: 04 April 2013 13:06 To: [log in to unmask] Subject: Re: non-esterified fatty acid concentration Dear Colleague Most fatty acids in food are esterified to be water soluble; non esterified fatty acid may be present in foods as a consequence of ripening and due to the lipase and microorganisms lypolitical effect. As an example, in ripened cheese, the non esterified fraction which is only 2% is due to the action of the lypasa from milk and from cheese microorganisms during the ripening, they make free fatty acids that contribute to smell of the product. So data about fatty acids composition you can find in food composition databases/tables are mainly from fatty acids that were esterified in food. JOSEFA RUBIO MAÑAS Unidad de Coordinación Científica Agencia Española de Seguridad Alimentaria y Nutrición (AESAN) Spanish Agency for Food Safety & Nutrition Calle Alcalá, 56. 28014 MADRID Tel: +34 913380257; Fax: +34 913380561 De: Food Composition Discussion Group [mailto:[log in to unmask]] En nombre de Haytowitz, David Enviado el: miércoles, 03 de abril de 2013 23:36 Para: [log in to unmask] Asunto: non-esterified fatty acid concentration Hello: We got a request asking if we had anything on the non-esterified fatty acid concentration of foods. Also, if anyone is working in this area. Thank you, David ******************************************************************** * David B. Haytowitz * U.S. Department of Agriculture * * 10300 Baltimore Avenue * Agricultural Research Service * * B-005, Rm. 207A, BARC-West * Beltsville Human Nutrition * * Beltsville, MD 20705 * Research Center * * 301-504-0714 * Nutrient Data Laboratory * * 301-504-0713 FAX * EMAIL: <mailto:[log in to unmask]> [log in to unmask] * ********************************************************************* This electronic message contains information generated by the USDA solely for the intended recipients. Any unauthorized interception of this message or the use or disclosure of the information it contains may violate the law and subject the violator to civil or criminal penalties. If you believe you have received this message in error, please notify the sender and delete the email immediately. _____ 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 <https://listserv.fao.org/cgi-bin/wa?SUBED1=InFoods-Food-Comp-L&A=1> &A=1 _____ CONFIDENCIALIDAD. El contenido de este mensaje y el de cualquier documentación anexa es confidencial y va dirigido únicamente al destinatario del mismo. Si Usted no es el destinatario, le solicitamos que nos lo indique, no comunique su contenido a terceros y proceda a su destrucción. CONFIDENTIALITY. The content of this message and any attached information is confidential and exclusively for the use of the addressee. If you are not the addressee, we ask you to notify to the sender, do not pass its content and delete the original. _____ 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 <https://listserv.fao.org/cgi-bin/wa?SUBED1=InFoods-Food-Comp-L&A=1> &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