From owner-drosophila@net.bio.net Sun Mar 24 22:00:00 1996 Newsgroups: bionet.drosophila Path: biosci!rutgers!uwm.edu!vixen.cso.uiuc.edu!uchinews!news From: "Martin E. Feder" Subject: FD&C Blue #1 as indicator of ingestion X-Nntp-Posting-Host: meflab.uchicago.edu Content-Type: text/plain; charset=us-ascii Message-ID: <315683E3.7859@uchicago.edu> Sender: news@midway.uchicago.edu (News Administrator) Content-Transfer-Encoding: 7bit Organization: University of Chicago -- Academic Computing Services Mime-Version: 1.0 Date: Mon, 25 Mar 1996 11:30:43 GMT X-Mailer: Mozilla 2.0 (Macintosh; I; 68K) Lines: 24 I am attempting to use a food coloring agent, FD&C Blue #1, to measure feeding rates in Drosophila larvae. This dye does not pass the gut wall and can therefore be used as an indicator of food consumption. The protocol I am using requires FD&C Blue #1 in its pure (i.e., powdered) form. Most sources at the wholesale and retail level sell a blue food color solution, which is FD&C Blue #1 dissolved in a mixture of liquids. Obviously these sources buy the powder from a supplier, and then dissolve it for wholesale or retail sale. My question is: Do you have names/addresses/phone #s for any of the original manufacturers of FD&C Blue #1? I would appreciate any information you can provide. Thanks in advance. Dr. Martin E. Feder Professor Department of Organismal Biology & Anatomy The University of Chicago 1027 East 57th Street Chicago, IL 60637 USA E-Mail: m-feder@uchicago.edu Telephone: 312 702-8096 Fax: 312 702-0037 http://www.bsd.uchicago.edu/BSDinfo/FacInfo.cgi/Feder/Martin .