Product Code Pack Size Sterling Euros Dollars      50180  250mg  £115  €182  $235   3´,4´-Dihydroxyflavone-4´-β-D-ribofuranoside sodium salt DHF-ribofuranoside sodium salt; 3´,4´-Dihydroxyflavone-4´-beta-D-ribofuranoside sodium salt CAS: 517892-04-5 MF: C20H17NaO8 MW: 408.30 Substrate producing highly visible, localised, black or dark brown colonies when used in conjunction with an iron salt. This dark colour is able to mask the colour formed by indoxyl substrates such as X-Gal (70045) when incorporated into the same medium.     Can also be used to produce discrete yellow colonies in the presence of aluminium salts.         Evaluation of novel beta-ribosidase substrates for the differentiation of Gram-negative bacteria. [Full copies of the above article are available on request].   Protected by Glycosynth patents: European Patents  1438423 and 1438424 and US Patents 7,384,763 and 7,531,646.   For use only in internal research conducted by the purchaser. No rights under the aforementioned patents are conveyed which permit the resale, transfer, or use for purposes other than research. Rights under the aforementioned patents, for purposes other than internal research, may be obtained by contacting Glycosynth Ltd.